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171 Cards in this Set
- Front
- Back
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What system is currently used by all branches of the military to identify test equipment?
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The Joint Electronics Type Designation System (JETDS) is used by all branches of the military to identify equipment by a system of standardized nomenclatures.
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Name the two classes of test equipment.
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The Electronic Test Equipment Classification Board classifies electronic test equipments as GENERAL PURPOSE (GPETE) or SPECIAL PURPOSE (SPETE) and
assigns responsibility for their management. |
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What test equipment is designed to generate, modify, or measure a range of parameters of electronic functions of a specific nature required to test a single system or equipment?
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Special-purpose electronic test equipment (SPETE) is specifically designed to generate, modify, or measure a range of parameters of electronic functions of a specific or peculiar nature required to test a single system or equipment.
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Name the two basic elements of the SCLSIS program.
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(1) VALIDATION, to establish a baseline data inventory
(2) INVENTORY UPDATING, to correct errors or omissions and to document configuration changes. |
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What calibration label is used when actual measurement values must be known to use the test equipment?
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The CALIBRATED—REFER TO REPORT label, shown in view B of figure 1-1, has red lettering and a white back ground. It comes in two sizes and is used when you must know the actual measurement values to use the instrument.
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An instrument that must be calibrated in place requires what type of calibration label?
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SPECIAL CALIBRATION
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Responsibility for repair and maintenance of test equipment generally rests with what group of personnel?
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Generally, the responsibility for repair and maintenance of test equipment is placed on maintenance personnel. In some cases, however, maintenance personnel are not authorized to make repairs. Then the test instrument must be sent to a shore repair/calibration facility.
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What Navy office oversees the MEASURE program?
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The Chief of Naval Operations oversees this program and establishes policy and guidelines.
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What are the two main categories of maintenance?
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PREVENTIVE (routine) and CORRECTIVE maintenance.
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What type of maintenance involves isolating equipment troubles and replacing defective parts?
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Corrective maintenance
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Which quantity (voltage or current) determines the intensity of an electrical shock?
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Current
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What tool is used to de-energize capacitors in a circuit that has been disconnected from its power source?
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approved type of shorting probe
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On what range should you set the voltmeter prior to taking a voltage measurement?
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highest range before measuring
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When taking a voltage measurement, which lead of the voltmeter should you connect to the circuit first?
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Connect the ground lead of the voltmeter first.
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Is an ammeter connected in series or in parallel with the circuit under test?
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in series with the circuit being tested.
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What must be done to a circuit before you can use an ohmmeter for testing?
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· The circuit being tested must be completely de energized.
· Any meters or transistors which can be damaged by the ohmmeter current must be removed before any measurement is made. |
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What is the term used to refer to the losses which can be traced to the dielectric of a capacitor?
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POWER FACTOR
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What effect does an increase in capacitance have on a capacitor’s opposition to current flow?
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Opposition to current flow (decreases)
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When a bridge is used to measure resistance, what is the value of Rx if R1 equals 80 ohms, R2 equals 120 ohms, and R3 equals 280 ohms?
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R1/R2 = Rs/Rx or Rx = (R2Rs)/R1
Rx = (120 x 280)/80 Rx = 420 ohms |
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When an unknown capacitance is tested with a bridge, what is the value of Cx if R1 equals 70 ohms, R2 equals 150 ohms, and Cs equals 550 microfarads?
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Cx = (R1Cs)/R2
Cx = (70 x 550)/150 Cx = 256.666 microfarads |
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What is the logarithmic ratio between the input and output of a given circuit called?
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Bel
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What term is used to represent power levels above or below a 1-milliwatt reference?
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dBm
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What milliwatt value is equal to +6 dBm?
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+20dBm = 100mW
+10dBm = 10mW +7dBm = 5mW +6dBm = 4mW +4dBm = 2.5mW +3dBm = 2mW 0dBm = 1mW -3dBm = .5mW -10dBm = .1mW |
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What name is given to a resistor used to replace the normal load in a circuit?
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DUMMY LOADS or DUMMY ANTENNAS
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What are the two types of bolometers?
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BARRETTER and the THERMISTOR
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As the dissipated power increases, what effect does this have on the resistance of a thermistor?
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Increases
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In a heterodyne-type frequency meter, what is the difference between the oscillator frequency and the unknown frequency?
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Beat Frequency
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What equipment uses a calibrated resonant circuit to measure frequency?
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WAVEMETERS
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Name two instruments used to analyze waveforms.
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oscilloscope and spectrum analyzer
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What device sweeps a band of frequencies to determine frequencies and amplitudes of each frequency component?
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Spectrum Analyzer
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What is the typical back-to-forward resistance ratio of a good-quality diode?
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A typical back-to-forward-resistance ratio is on the order of 10 to 1, and a forward-resistance value of 50 to 80 ohms is common
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As a transistor ages, what happens to the leakage current?
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As the transistor ages, the amount of leakage current tends to increase.
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What meters operate from their own power sources?
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SELF-EXCITED
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What physical component of a galvanometer provides the restoring force for the coil?
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thin, flat ribbons of phosphor bronze
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In a galvanometer, what two methods are used to indicate the amount of coil rotation?
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(1) the POINTER arrangement
(2) the LIGHT AND MIRROR arrangement. |
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What is the primary disadvantage of the pointer arrangement for indicating coil rotation?
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it introduces a mechanical coil balancing problem, especially if the pointer is long.
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What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?
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Hairspring
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What component supplies restoring force to the coil of the D’Arsonval meter movement?
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Hairspring
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What advantage is gained by using pole pieces with curved faces in the D’Arsonval meter movement?
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Makes it possible to have a more linear scale than if the poles were flat.
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What structurally large, low-resistance conductor is connected in parallel with the meter movement to prevent damage?
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Shunt.
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What type of temperature coefficient material does not produce increased heat in response to increased current flow?
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Zero-temperature coefficient.
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A good choice of shunt resistance will place the indicating pointer near what part of the meter scale with a normal load?
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Midscale.
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In what manner are current-measuring instruments connected to a circuit?
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In series.
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An ammeter should always be connected so that current will flow into what terminal and out of what terminal?
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Negative, positive.
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(True or False) The larger the current required to produce full-scale deflection of the meter coil, the better the sensitivity of the meter.
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False
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What condition exists when the insertion of a meter into a circuit changes the operation of the circuit?
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Meter-Loading
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What modification is made to the D’Arsonval meter movement to enable the meter to measure voltage?
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A multimeter (high resistance) is placed in series with the coil of the meter.
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What factors determine the value of the multiplier resistor?
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The current required for full-scale deflection, and the range of the voltage to be measured
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In what manner are voltage-measuring instruments connected to the circuit to be measured?
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In parallel.
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When making voltage measurements in a high-resistance circuit, you should always use a voltmeter with what relative value of resistance?
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High
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What term is used to express the sensitivity of a voltmeter?
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Ohms per volt.
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What instrument is used for measuring the insulation resistance of cables?
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Megohmmeter (megger).
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What added features enable a dc milliammeter to function as an ohmmeter?
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1. A source of dc potential.
2. One or more resistors (one of which is variable). |
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A full-scale deflection on an ohmmeter scale indicates what resistance between the leads?
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Zero.
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The R X 100 resistance selection on an ohmmeter has what amount of resistance compared to theR X 10 selection?
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1/10.
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What is the purpose of the guard ring in a megohmmeter?
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Shunts leakage current, which prevents false readings
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Most meggers you will use are rated at what voltage?
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500.
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The development of excessive test voltages is avoided by the use of meggers equipped with what device?
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Friction clutches
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What components in an electrodynamometer-type meter movement produce the magnetic field?
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Fixed coils
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What is the limiting factor as to the amount of current an electrodynamometer meter movement can handle?
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Size of spiral conducting.
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What is the primary advantage of the electrodynamometer-type meter over the D’Arsonval-type meter?
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The electrodynamometer-type meter can be used to measure both ac and dc currents.
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What is one of the greatest advantages of a VOM?
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no external power source is required for its operation
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Before you connect a VOM in a circuit for an ohmmeter reading, in what condition must the circuit be?
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De-energized.
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When taking resistance readings with a VOM, you will obtain the most accurate readings at or near what part of the scale?
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Midscale.
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Besides setting up the meter for expected voltage ranges, what must be strictly observed when taking dc voltage readings?
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Polarity.
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Power for the electronic digital multimeter is normally supplied by what internal power source?
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Rechargeable batteries.
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How is an overload condition indicated by the electronic digital multimeter?
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Simultaneous flashing of display readouts.
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In an electronic digital multimeter, the digital information is displayed by what type of numerical readouts?
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Light-emitting diodes.
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What is the general function of the differential voltmeter?
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To compare an unknown voltage with a known reference voltage and indicate the difference in their values.
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To measure incident power, you must rotate the coupler-detector of the wattmeter so that the arrow indicating power flow points toward which end of the transmission line?
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Load
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What condition produces the 10-kHz error signal generated by the metering bridge in the HP-431C power meter?
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An unbalance in the metering bridge.
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In signal generators, what device is used to regulate the voltage of the output signal?
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Attenuator.
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Name the three main sections of a typical rf signal generator.
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Oscillator circuit, modulator, and output control circuit.
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What is the function of the modulating circuit?
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To produce an af (or video) signal that can be superimposed on the rf signal produced by the
oscillator. |
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What frequencies are provided through the back-panel BNC?
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1 MHz and 10 MHz.
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The LED lamps of a typical logic probe are normally in what state?
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DIM.
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On the CRT display, what information is displayed in Quadrant 4?
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Positive voltage (+V) and negative current (−I).
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When aligning the trace with a short applied to channel A, which control should be adjusted to bring the trace parallel to the vertical axis?
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TRACE ROTATE control.
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What minimum/maximum voltage level can be attained in the pulse generator section by adjusting the LEVEL control?
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0 to 5 volts.
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Medium 1 range is designed to check what resistance values?
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50 Ohms to 10K Ohms.
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What element controls the number of electrons striking the screen? (electron Gun)
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Control grid.
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What element is controlled to focus the beam? (Electron Gun)
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The first anode.
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Why are the electrostatic fields between the electron gun elements called lenses?
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Because they bend electron streams in much the same manner that optical lenses bend light rays.
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What is the function of the second anode?
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It accelerates the electrons emerging from the first anode.
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What effect do longer deflection plates have on the electron beam?
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A greater deflection angle.
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What effect does closer spacing of plates have on the electron beam?
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A greater deflection angle.
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Is the deflection angle greater with higher or lower potential on the plates?
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Higher potential.
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Is the deflection angle greater when the beam is moving faster or slower?
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Slower beam.
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Waveforms are described in terms of what two functions?
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Amplitude and time.
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The vertical-deflection plates are used to reproduce what function?
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Amplitude.
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The horizontal-deflection plates are used to produce what function?
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Time and/or frequency relationships.
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Why are the ends of the deflection plates bent outward?
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To permit wide-angle deflection of the beam.
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What term is used to describe the reciprocal of deflection sensitivity of a scope?
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Deflection factor.
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List the circuits that all oscilloscopes have in common.
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A CRT, a group of control circuits, power supply, sweep circuitry, and deflection circuitry.
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When you select the time base to display a signal, should the time base be the same, higher, or lower than the input signal?
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Lower.
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Oscilloscopes are used to measure what quantities?
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Amplitude, phase, time, and frequency.
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Scopes that produce two channels on a single CRT with a single beam are referred to as what types of scopes?
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Dual-trace oscilloscopes.
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The first converter is also known by what other name?
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Front end.
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What system is currently used by U.S. military services to identify electronic equipment with standardized nomenclature?
1. Joint Electronic Type Designation System (JETDS) 2. Joint Electronics Type Category System (JETCS) 3. Army-Navy (AN) System 4. Navy Tactical Data Systems (NTDS) |
1. Joint Electronic Type Designation System (JETDS)
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Which of the following categories of test equipment is/are designed to test, without modification, a range of electronic parameters needed for two or more systems that are different in design?
1. GPETE 2. SPETE 3. Both 1 and 2 above 4. Installed |
1. GPETE
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For what purpose was the ETE classification board established?
1. To control inventory limits 2. To control the increase of nonstandard GPETE 3. To control the increase of nonstandard SPETE 4. To become final approval authority for SPETE |
2. To control the increase of nonstandard GPETE
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Which of the following systems provides an inventory of test equipment actually located in the fleet?
1. 3M 2. SCLSIS 3. STEED 4. SPETREL |
2. SCLSIS
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You can determine if a piece of test equipment has been calibrated by checking which of the following
documents? 1. The test equipment logbook 2. A directive from the EMO 3. The completed maintenance action form for the instrument 4. A tag or label attached to the instrument |
4. A tag or label attached to the instrument
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What label is used to identify a test instrument that is within tolerance on all parameters?
1. INACTIVE 2. CALIBRATED 3. CALIBRATED—Refer to report 4. ORGANIZATION LEVEL CALIBRATED |
2. CALIBRATED
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Which of the following conditions warrants the use of one of the SPECIAL CALIBRATION labels and/or tags?
1. Calibration deviates from the usual tolerances 2. The instrument has more than one calibration interval 3. The instrument is too large to move and requires in-place calibration 4. Each of the above |
4. Each of the above
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Under what circumstances should the USER CALIBRATION label be affixed to a piece of test equipment?
1. When a certain calibration schedule is assigned 2. When user calibration is required before, during, or after use 3. When the equipment is out for calibration 4. Each of the above |
2. When user calibration is required before, during, or after use
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Which of the following statements must appear on the CALIBRATION NOT REQUIRED label affixed to an
instrument? 1. By what authority the label was affixed 2. The reason no calibration is required 3. The date the label was affixed 4. The METRL page number |
1. By what authority the label was affixed
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Which of the following labels is attached to an unusable instrument, and may have an additional tag attached?
1. INACTIVE 2. REJECTED 3. CALIBRATED 4. SPECIAL CALIBRATION |
2. REJECTED
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A test instrument that has plug-in modules and/or easily accessible potentiometer or controls which affect
the calibration of the instrument should have which of the following labels attached? 1. CALIBRATED 2. CALIBRATION NOT REQUIRED 3. CALIBRATED—REFER TO REPORT 4. CALIBRATION VOID IF SEAL BROKEN |
4. CALIBRATION VOID IF SEAL BROKEN
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A replacement part needed by an IMA to repair a piece of test equipment should be ordered by the activity sending the inoperative equipment for repair and calibration. For which of the following reasons is this a good practice?
1. IMAs are not allowed to order repair parts 2. The ship has more repair funds than the IMA 3. The ship is usually able to obtain the parts more quickly 4. It is more likely the technician on the ship will obtain the correct part |
3. The ship is usually able to obtain the parts more quickly
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When maintenance personnel are not authorized to make repairs to a piece of test equipment, what items, if any, must be sent to the calibration repair facility with the equipment?
1. The unit and its power cord 2. All the accessories 3. Standards used to calibrate 4. None |
2. All the accessories
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In what type of environment should test equipment be stowed?
1. Dry 2. Dark and damp 3. High humidity and low temperature 4. High temperature and high humidity |
1. Dry
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In a stowage space aboard ship, what device(s) should be used to hold the test equipment in place?
1. Set clasp springs 2. Tie down cord 3. Steel straps 4. Stretch seat-belt-type straps |
4. Stretch seat-belt-type straps
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What system is used to provide for a standardized recall and scheduling of test equipment into calibration facilities?
1. MDCC 2. SCLSIS 3. METER 4. MEASURE |
4. MEASURE
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The meter card is used to provide what information concerning test equipment?
1. Changes 2. Additions 3. Deletions 4. All of the above |
4. All of the above
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Which of the following actions would be classified as preventive maintenance?
1. Purchasing a new piece of test equipment 2. Isolating an equipment failure to the component level 3. Aligning a servo assembly after a repair 4. Replacing a defective transistor |
1. Purchasing a new piece of test equipment
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Which of the following actions would be regarded as part of corrective maintenance?
1. Routine lubrication of a radar pedestal 2. Mechanical inspection of a bearing assembly in a motor housing 3. Alignment of a servo assembly after a repair 4. Cleaning a filter in accordance with a maintenance requirement card |
3. Alignment of a servo assembly after a repair
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Troubleshooting electrical and electronic equipment includes which of the following actions?
1. Fault isolation 2. Equipment repair 3. Equipment performance evaluation 4. Each of the above |
4. Each of the above
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The initial operating conditions of newly installed equipment are referred to as
1. alignment data 2. manufacturer's specifications 3. baseline operating characteristics 4. expected operation characteristics |
3. baseline operating characteristics
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When working on energized equipment, you should follow which of the following practices?
1. Work alone 2. Work with both hands 3. Insulate yourself from ground 4. Wear rubber gloves at all times |
3. Insulate yourself from ground
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When measuring 300 volts or more, you should first take what step?
1. Turn off equipment power 2. Ground all components capable of retaining an electrical charge 3. Short-circuit all components capable of retaining an electrical charge 4. Connect the meter leads to the points to be measured |
1. Turn off equipment power
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Which of the following insulating materials is suitable for covering a grounded metal work bench?
1. Dry insulating material that contains no holes or conductors 2. Dry canvas that has holes in it 3. Dry phenolic material that has conductors embedded in it 4. Damp plywood |
1. Dry insulating material that contains no holes or conductors
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Prior to working on a circuit, you use a shorting probe discharge which of the following types of components?
1. Capacitors only 2. Cathode-ray tubes only 3. Capacitors and cathode-ray tubes 4. Inductors |
3. Capacitors and cathode-ray tubes
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If a 28 volt 6 ampere fuse blows, the proper procedure is to replace it with which of the following devices?
1. A larger fuse until the cause of the overload has been determined 2. A fuse of the same voltage and current rating 3. A fuse rated 20 percent lower than the blown fuse 4. A copper strap until the cause of the overload is determined |
2. A fuse of the same voltage and current rating
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Before electrical equipment is overhauled or repaired, what general safety precaution, if any, should be
followed? 1. The fuse for the associated circuits should be replaced with circuit breakers 2. The main supply switches should temporarily be shorted out 3. The power switches should be secured open and tagged out of service 4. None |
3. The power switches should be secured open and tagged out of service
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After work on equipment is complete, who should remove any attached tags?
1. The job inspector 2. The repair crew leader 3. Any member of the repair crew 4. The person who signed and attached the tag |
4. The person who signed and attached the tag
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What is the purpose of the grounding cable attached to the frame of a generator aboard ship?
1. Create a potential difference between the frame and the ship 2. Conduct power to the generator under emergency conditions 3. Ensure equipment is at same ground potential as the ship 4. Break the circuit between the frame and the power supply under emergency conditions |
3. Ensure equipment is at same ground potential as the ship
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Which of the following steps should you take to help ensure that metal-case test equipments are safe to use?
1. Energize the instrument to test the ground 2. Ensure the equipment is grounded 3. Insulate the metal case from ground 4. Connect all metal cases to a common ungrounded lead |
2. Ensure the equipment is grounded
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Which of the following precautions should you observe when using measuring instruments?
1. Avoid strong magnetic fields 2. Avoid excessive current 3. Avoid mechanical shock 4. Each of the above |
4. Each of the above
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The meter movement in a voltmeter can be easily damaged by excessive current if you do not follow certain procedures. When setting up the meter to read voltage, the RANGE SWITCH should first be set to (a) what relative range and then changed to (b) what relative range?
1. (a) Highest (b) Closest to the voltage to be read 2. (a) Highest (b) Lower than the voltage to be read 3. (a) Lowest (b) Lower than the voltage to be read 4. (a) Lowest (b) Closest to the voltage to be read |
1. (a) Highest
(b) Closest to the voltage to be read |
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A. Place one hand in your pocket or behind your back.
B. Turn on the power. C. Connect the meter ground to the equipment ground. D. Place the positive meter lead on the test point; select for positive or negative polarity. Figure 1A.—Procedures When you measure voltages less than 300 volts, in what order should you complete the task? 1. A B C D 2. B C D A 3. C A D B 4. D C B A |
1. A B C D
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This measurement is rarely taken in preventive or corrective maintenance or testing because unsoldering is usually required. Ohm's law is normally applied
to determine this value. 1. Current 2. Inductance 3. Resistance 4. Capacitance |
1. Current
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This is a valuable aid in locating faults during corrective maintenance, but cannot be made with power applied.
Many technical manuals contain charts that indicate the test points for this measurement. 1. Current 2. Inductance 3. Resistance 4. Capacitance |
3. Resistance
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This measurement provides an indication of dielectric strength and is used to determine the power factor.
1. Current 2. Inductance 3. Resistance 4. Capacitance |
4. Capacitance
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This measurement is seldom taken during troubleshooting. It can be taken using a bridge or another instrument that is primarily designed to measure another
quantity; however, a conversion chart is required. 1. Current 2. Inductance 3. Resistance 4. Capacitance |
2. Inductance
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The power factor is an indication of the losses caused by which of the following conditions?
1. Excessive voltage 2. Dielectric absorption 3. Current leakage 4. Both 2 and 3 above |
4. Both 2 and 3 above
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The Wheatstone bridge can be used for precision measurements of which of the following quantities?
1. Voltage 2. Current 3. Impedance 4. Resistance |
4. Resistance
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In a DC resistance Bridge R1 = 80 ohms, R2 = 120 Ohms, and R3 = 280 ohms. What is the value of Rx?
1. 42 Ohms 2. 400 Ohms 3. 420 Ohms 4. 4,200 Ohms |
Rx = ((R2)(R3)) / R1
Rx = (120 x 280) / 80 Rx = 420 Ohms 3. 420 Ohms |
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In an AC Resistnce Bridge, R1 = 10K ohms, R2 = 50K ohms, and Rs = 500 ohms. What is the value of Rx?
1. 25 ohms 2. 250 ohms 3. 2,500 ohms 4. 25,000 ohms |
Rx = ((R2)(Rs)) / R1
Rx = (50K x 500) / 10K Rx = 2,500 Ohms 3. 2,500 Ohms |
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In a Capacitance Bridge R1 = 150 ohms, R2 = 70 ohms, and Cs = 550 uF. What is the value of Cx?
1. 25 uF 2. 117 uF 3. 256 uF 4. 1178 uF |
Cx = ((R1)(Cs)) / R2
Cx = (150 x 550 uF) / 70 Cx = 0.001178 4. 1178 uF |
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Dc power is stated in which of the following units?
1. Watts 2. Farads 3. Amperes 4. Henries |
1. Watts
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Power in an audio-frequency circuit is stated in which of the following units?
1. Decibels (dB) only 2. Decibels referenced to 1 milliwatt (dBm) only 3. Both dB and dBm 4. Volt units (Vu) |
3. Both dB and dBm
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The bel is a unit of measurement used with voltage, current, or power that compares which of the following circuit values?
1. The input to the output 2. The output to a reference 3. The voltage to power 4. The current to power |
1. The input to the output
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What is the relationship between the values of the bel and the decibel?
1. The bel is twice the decibel 2. The decibel is twice the bel 3. The bel is 1/10 the decibel 4. The decibel is 1/10 the bel |
4. The decibel is 1/10 the bel
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What is the corresponding increase in dBm each time power is doubled?
1. +1 dB 2. +2 dB 3. +3 dB 4. +10 dB |
3. +3 dB
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A thermocouple ammeter is used to measure which of the following quantities?
1. Rf current 2. Af current 3. Motor current 4. Generator current |
1. Rf current
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A bolometer is a power meter that measures power in certain frequency ranges. Which of the following methods
is/are used by the bolometer to measure power values? 1. A barretter detects increases in power when its resistance increases 2. A thermistor detects increases in power when its resistance decreases 3. Both 1 and 2 above 4. Power is measured directly |
2. A thermistor detects increases in power when its resistance decreases
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To measure shaft rotation rate on an engine, you should use, which, if any, of the following instruments?
1. An ammeter 2. A bolometer 3. A tachometer 4. None of the above |
3. A tachometer
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In the centrifugal tachometer, what component restricts the action on the lower collar that is produced by
centrifugal force? 1. The spring 2. The pointer 3. The upper collar 4. The lower collar |
1. The spring
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What is the usual speed range (in feet per minute) of a chronometric tachometer?
1. 0 to 30 2. 0 to 300 3. 0 to 3,000 4. 0 to 30,000 |
3. 0 to 3,000 or 0 - 10,000 rpm
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The flashing rate of a strobotac is controlled by which of the following circuits?
1. An electronic pulse generator 2. A frequency divider 3. A power supply 4. An amplifier |
1. An electronic pulse generator
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The flashing rate of the strobotron tube affects its life expectancy. What is the range (in hours) of life expectancy of the strobotron tube?
1. 15 to 24 2. 25 to 49 3. 50 to 99 4. 100 to 250 |
4. 100 to 250
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The vibrating-reed frequency meter is a delicate instrument and should not be subjected to vibrations, such as those associated with motor-generators or their
associated control panels. 1. True 2. False |
2. False
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When using the vibrating-reed frequency meter, you take the reading in which of the following ways?
1. Read the digital readout 2. Read the dial indication 3. Read the mechanical setting 4. Read the reed that vibrates the most |
4. Read the reed that vibrates the most
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Bandpass filters and band reject filters are tuned circuits that either pass or reject specific frequencies. In these filters, (a) what type offers very high impedance to
currents at its resonant frequency, and (b) what type offers a very low impedance to currents at its resonant frequency? 1. (a) Parallel-tuned (b) series-tuned 2. (a) Parallel-tuned (b) parallel-tuned 3. (a) Series-tuned (b) parallel-tuned 4. (a) Series-tuned (b) series-tuned |
1. (a) Parallel-tuned (b) series-tuned
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When you are zero beating an unknown frequency with a frequency provided by a calibrated, high-precision oscillator within a heterodyne frequency meter, what will be the indication when the two frequencies are matched?
1. One dot of light on the screen will be superimposed on the other 2. One vertical line on the screen will be superimposed on the other 3. The two tones in the headset will achieve the same pitch, at which time a series of clicks will begin 4. The tone in the headset will decrease in pitch and be replaced by clicks that will become slow or nonexistent |
4. The tone in the headset will decrease in pitch and be replaced by clicks that will become slow or nonexistent
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When you are using an absorption wavemeter to measure frequency, the greatest accuracy may be obtained by loosely coupling the pickup coil so that the indicator lamp burns (a) with what degree of brilliance (b) under what
resonance condition? 1. (a) Maximum brilliance (b) when tuned to the resonant frequency 2. (a) Maximum brilliance (b) when not tuned to the resonant frequency 3. (a) Dimly (b) when not tuned to the resonant frequency 4. (a) Dimly (b) when tuned to the resonant frequency |
4. (a) Dimly
(b) when tuned to the resonant frequency |
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Which of the following instruments should be used to accurately measure a frequency in the shf range?
1. Absorption wavemeter 2. Resonant, cavity-type wavemeter 3. Resonant, coaxial-line-type wavemeter 4. Both 2 and 3 above |
4. Both 2 and 3 above
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In a cavity wavemeter, moving the plunger farther into the cavity space causes which of the following changes to (a) the cavity size and (b) the resonant frequency of the cavity?
1. (a) Decrease (b) increase 2. (a) Decrease (b) decrease 3. (a) Increase (b) decrease 4. (a) Increase (b) increase |
1. (a) Decrease (b) increase
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For which of the following purposes is a cathode-ray oscilloscope used?
1. To measure microwave energy 2. To visually analyze waveforms 3. To provide frequency modulation 4. To locate stray radio interference |
2. To visually analyze waveforms
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The synchroscope contains which of the following circuits?
1. Retrace blanking circuit 2. A wide band amplifier 3. A trigger sweep 4. All of the above |
4. All of the above
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On an oscilloscope display time is represented by what measurement, and (b) amplitude is represented by what measurement?
1. (a) Horizontal (b) Horizontal 2. (a) Horizontal (b) Vertical 3. (a) Vertical (b) Vertical 4. (a) Vertical (b) Horizontal |
2. (a) Horizontal (b) Vertical
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An oscilloscope measures voltage and displays waveforms. It can be used to measure currents, temperatures, speeds, and accelerations if they are first
converted to 1. heat 2. light 3. voltages 4. pressures |
3. voltages
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The spectrum analyzer is used to display which of the following quantities?
1. Amplitude within each frequency component in a circuit 2. Proportions of power within each frequency component in the spectrum 3. Frequencies produced in a circuit 4. Each of the above |
3. Frequencies produced in a circuit
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While testing a semiconductor diode, you determine that the forward resistance value is 60 ohms. You should consider the diode good if the backward resistance
is at least which of the following values? 1. 6 ohms 2. 60 ohms 3. 600 ohms 4. 6,000 ohms |
(10:1) Backward : Foward
3. 600 ohms |
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When you are using an oscilloscope to test a crystal diode, what is shown by (a) the vertical deflection and (b) the horizontal deflection?
1. (a) Crystal current (b) voltage applied to the diode 2. (a) Crystal current (b) power developed in the diode 3. (a) Crystal voltage (b) power developed in the diode 4. (a) Crystal voltage (b) voltage applied to the diode |
1. (a) Crystal current
(b) voltage applied to the diode |
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When you are using the oscilloscope to test the Zener diode, what is represented by (a) vertical deflection and (b) horizontal deflection?
1. (a) Zener current (b) Zener power 2. (a) Zener current (b) applied voltage 3. (a) Applied voltage (b) Zener power 4. (a) Applied voltage (b) Zener current |
2. (a) Zener current
(b) applied voltage |
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When troubleshooting transistorized circuits, you should first check the condition of which of the following
circuits? 1. Counters 2. Amplifiers 3. Oscillators 4. Power supplies |
4. Power supplies
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Which of the following instruments is used to check transistors for collector leakage current and current gain?
1. Ohmmeter 2. Voltmeter 3. Wheatstone bridge 4. Semiconductor test set |
4. Semiconductor test set
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When making base-to-emitter bias voltage checks on a transistor, you should read which of the following
voltage ranges? 1. 5 to 20 microvolts 2. 50 to 200 millivolts 3. 5 to 20 volts 4. 50 to 200 volts |
2. 50 to 200 millivolts or 0.05 to 0.20
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When making resistance measurements on a transistor with an ohmmeter, you should allow what maximum current in the transistor?
1. 1 milliampere 2. 2 milliampere 3. 1 microampere 4. 2 microampere |
1. 1 milliampere
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