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59 Cards in this Set
- Front
- Back
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What is the simplest form of matter?
a) Element b) Mixture c) Electrons d) Compound |
A) Element
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In an atom, What electrons contain the MOST energy?
a) The energy is shared equally by all electrons b) Orbiting electrons c) Valence electrons d) K shell electrons |
C) Valence electrons
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Atoms having MORE than four electrons, but less than eight are known as...
a) insulators b) conductors c) stable atoms d) semiconductors |
A) Insulators
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The electrostatic fields around a POSITIVE ion move
a) inward b) outward c) inward, then outward d) outward, then inward |
B) Outward
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What are factors that affect the resistance of a material?
a) area, weight, and state of material b) area, temperature, and type of material c) temperature, weight, and state of material d) temperature, type of material, and sate of material. |
B) Area, temperature, and type of material.
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What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?
a) 40 ohms b) 20 ohms c) 10 ohms d) 0.5 ohms |
C) 10 ohms
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Convert 500 milliamps to standard amperage.
a) .005 amps b) .05 amps c) .5 amps d) 50 amps |
A) .005 amps
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In a series-parallel circuit, find RT if series resistor R1=7 ohms, and parallel resistor R2 and R3=8 ohms.
a) 23 ohms b) 15 ohms c) 11 ohms d) 8 ohms |
C) 11 ohms
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In a series-parallel circuit, the series current at I1=9 amps, in the two parallel branches, I2=5 amps, and the value of I3 is not listed. Use Ohm's law to find the value of I3 and IT.
a) I3=5 amps and IT=14 amps b) I3=4 amps and IT=9 amps c) I3=4 amps and IT=18 amps d) not enough information to solve. |
B) I3=4 amps and IT=9 amps.
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What is the difference between an open and a short?
a) an open causes resistance to decrease, a short causes resistance to increase b)excessive current flow in an open circuit, no current flow in a shorted component. c) no current flow in an open circuit, excessive current flow in a shorted component. d) minimum voltage development across the open component, maximum voltage development across the shorted component. |
C) No current flow in an open circuit, no current flow in a shorted component.
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Voltage induced into a conductor by the expanding and collapsing of a magnetic field is...
a) magnetism b) reluctance c) direct current d) electromagnetic induction |
D) Electromagnetic Induction
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In an inductor, what happens to the magnetic lines of force if the diameter of the core is INCREASED in size?
a) permeability decreases b) magnetic field decreases c) induction of the coil increases d) induction of the coil decreases |
B) Magnetic field decreases
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What is the BASIC principle of operation for transformers?
a) mutual induction b) magnetic induction c) counterelectromotive force d) primary and secondary induction |
A) Mutual induction
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What type of transformer contains MORE turns in the primary winding than in the secondary winding?
a) current b) step up c) rectifier d) step down |
B) Step up
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If the size of the plates of a capacitor is increased, how is capacitance affected?
a) capacitance increases b) capacitance decreases c) electrons are distorted and scattered. d) electrostatic force between the plates decreases. |
A) Capacitance increases
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What statement BEST describes a capacitive circuit?
a) current leads applied voltage by 90 degrees. b) applied voltage leads current by 90 degrees. c) has the ability to conduct in one direction and not the other d) has the ability to conduct in all directions when gated or discharged. |
D) Has the ability to conduct in all directions when gated or discharged.
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How many electrons does the valance band of an intrinsic semiconductor have?
a) 3 b) 4 c) 5 d) 6 |
B) 4
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What are the MINORITY carriers in P-type material?
a) holes b) protons c) neutrons d) electrons |
A) Holes
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The area of a semiconductor where P-type material is joined to N-type material is known as...
a) dielectric region b) depletion region c) depletion field d) PN region |
B) Depletion region
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A junction diode has how many PN junction(s)?
a) 1 b) 2 c) 3 d) 4 |
A) 1
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In a circuit using a bridge recitifier, how many diodes are FORWARD BIASED during the FIRST cycle of alternating current (AC)?
a) 4 b) 3 c) 2 d) 1 |
C) 2
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If a zener diode is installed int he forward bias mode in a circuit, it act as a...
a) regular diode b) spike protector c) voltage reference d) voltage regulator |
A) Regular diode
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How is a zener diode connected in a circuit to regulate voltage?
a) in parallel to the load b) in series with the load c) in parallel to the resistor d) in series with the resistor |
A) In parallel to the load
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If a schematic diagram DOESNT list a reference for the zener diode, the diode is probably being used as a...
a) reference b) normal diode c) spike protector d) voltage regulator |
C) Spike protector
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How is the zener diode connected in a circuit to protect the load?
a) in parallel to the resistor b) in series with the load c) in parallel to the load d) forward biased |
C) In parallel to the load
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What is the PRIMARY use of a silicon-controlled rectifier (SCR)?
a) electronic swtich b) voltage regulator c) circuit amplifier d) spike protector |
A) Electronic switch
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The silicon-controlled rectifier (SCR) has how many layers?
a) 1 b) 2 c) 3 d) 4 |
D) 4
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IF a SMALL potential is applied to the gate of a silicon-controlled rectifier (SCR), the....
a) middle junction of the SCR is reverse biased and the SCR turns off. b) middle junction of the SCR is forward biased and the SCR turns on. c) depletion region increases in size and blocks current flow d) depletion region decreases in size and stops current flow |
A) Middle junction of the SCR is reverse biased and the SCR turns off.
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What is the MAJOR difference between an NPN transistor and a PNP transistor?
a) A PNP transistor can only be used as a regulator b) An NPN transistor can only be used as a switch. c) Direction of current flow d) Number of junctions |
C) Direction of current flow
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If the arrow in a bipolar transistor is pointing AWAY from the base, what type of transistor is it?
a) N-type b) P-type c) NPN d) PNP |
C)NPN
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The circuit in the bipolar transistor that carried 5 percent of the current flow is the...
a) base circuit b) load circuit c) control circuit d) emitter-collector circuit |
C) Control circuit
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What happens if the emitter-base (E-B) current is INCREASED in a transistor amplifier?
a) resistance decreases and current through the load circuit decreases. b) current decreases through the emitter-collector (E-C) circuit c) resistance increases and current flow decreases d) current increases through the E-C circuit. |
D) Current increases through the E-C circuit.
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How many junctions are in a unijunction transistor (UJT)?
a) 1 b) 2 c) 3 d) 4 |
A) 1
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What are the three leads in a unijunction transistor (UJT) called?
a) anode, cathode, and gate b) emitter, base 1, and base 2 c) emitter, collector, and base d) common emitter, common collector, and common base |
B) Emitter, base1, and base 2.
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The EMITTER in a unijunction transistor (UJT) always points toward the...
a) base 1 lead b) collector c) emitter d) gate |
A) Base 1 lead
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The amount of voltage it takes for a UJT to fire is determined by the position...
a) the emitter is placed on the N-type material b) the emitter is placed on the P-type material c) of B1 and B2 on the P-type material d) of the UJT in the circuit |
A) The emitter is placed on the N-type material
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What controls the firing time of the UJT?
a) intrinsic standoff ratio b) resistance in the circuit c) capacitance in the circuit d) resistance and capacitance in the circuit. |
D) Resistance and capacitance in the circuit.
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In what position must the line drop switch be placed when adjustments are made to a voltage regulator?
a) ON b) OFF c) adjust d) regulator |
A) ON
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What component of the voltage regulator compensates for losses in the power cable by sensing changes in current flow?
a) load rheostat b) no load rheostat c) line drop switch d) voltage adjustment rheostat |
A) Load rheostat
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The portion of the voltage regulator that supplies the excitier field voltage is transformer..
a) (TI) and rectifier (B3) b) (T3) and rectifier (B2) c) (T2) and rectifier (B1) d) (T1) and rectifier (CR26) |
D) (T1) and rectifier (CR26)
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What component controls the strength of the -86D generator exciter field L2?
a) excitation relay K16 b) time delay c) voltage regulator VR1 d) automatic manual switch S1 |
C) Voltage regulator VR1.
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An -86D is operating and the AC voltmeter is reading 200 volts alternating current (VAC) on ALL three phases. What do you do?
a) adjust VR1 b) adjust R61 c) adjust VR1 or R61 d) switch s15 to the L-N position |
D) Switch S15 to the L-N position
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While operating an -86D at governed speed, you place S13 in the build up position and the undervoltage light comes on. What is a PROBABLE cause of this trouble?
a) voltage regulator b) plug interlock relay c) memory time delay relay d) overvoltage/undervoltage relay. |
C) Memory time delay relay
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The -86D is applying 115 VAC to the aircraft and all of the sudden the AC contactor opens and there is no voltage indication on M2. What is the probable cause?
a) Load contactor b) CR17 forward biased c) overvoltage/undervoltage relay d) memory time-delay relay energized |
C) Overvoltage/undervoltage relay
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What component on the B809A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?
a) injector pump b) transfer pump c) injector nozzles d) throttle actuator |
A) Injector pump.
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What contacts on the annunciator card of the B809A generator set control the alternating current (AC) power input to the voltage regulator?
a) engine fault b) regulator fault c) generator fault d) contactor fault |
C) Generator fault
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What signal powers the regulator card output pulse sent tot he exciter field of the B809A generator?
a) 28.5 VDC b) 110 VDC c) 115 VAC d) 200 VAC |
B) 110 VDC
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What B809A engine safety circuit incorporates a seven-second time delay before activation?
a) low fuel fault b) overspeed fault c) low lube pressure d) coolant temperature |
C) Low lube pressure
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What action occurs when the B809A alternating current (AC) card senses an AC supply fault?
a) only generator output stops b) only the AC contactor opens c) AC supply warning light illuminates d) AC contactor opens and generator output stops |
D) AC contactor opens and generator output stops.
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What condition is sensed by the direct current (DC) card on the B809A?
a) overtemperature b) under frequency c) overfrequency d) low fuel |
A) Overtemperature
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What gas turbine engine component is SPECIFICALLY designed to break if the engine locks up?
a) second stage impeller b) first stage diffuser c) copressor shaft d) torsion shaft |
D) Torsion shaft
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During the operation of a -60, you noticed the exhaust gas temperature is excessively high. What is the probable cause?
a) air oil seals b) fuel atomizer c) torus assembly d) pneumatic thermostat |
D) Pneumatic thermostat
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In the lubrication system of the -60, how does the oil pressure relief valve control the output of the main oil pump?
a) through the filter bypass valve b) through the oil pressure sequencing switch c) it bypasses excess oil back to the oil filter inlet d) it bypasses excess oil back to the main pump inlet. |
D) It bypasses excess oil back to the main pump inlet
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What component of the -60 lubrication system on a gas turbine engine draws excess oil from the gear case?
a) oil cooler b) main oil pump c) scavenge pump d) oil jet assembly |
C) Scavenge pump
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While performing an operational check of the -60, you notice the unit is only operating at 97%. What is the probable cause?
a) 110% centrifugal switch b) fuel pump and control unit c) acceleration limiter valve d) governor trim control |
D) Governor trim control
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The rate adjustment screw in the -60 is used to adjust the rate at which chamber...
a) 4 depressurizes b) 3 depressurizes c) 2 depressurizes d) 1 depressurizes |
A) 4 depressurizes
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Apparent power is measured in
a) kilovolts (KV) b) kilowatts (KW) c) kilo-volt-amperes (KVA) d) kilo-watt-amperes (KWA) |
C) kilo-volt-amperes (KVA)
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Use the power factor meter on an -8 load bank..
a) during resistive load tests b) when measuring true power c) when measuring apparent power d) during performing resistive and reactive load tests simultaneously |
D) During performing resistive and reactive load tests simultaneously
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What is the operating voltage of the blower motor and control relays on a -8?
a) 12 VDC b) 28 VDC c) 120 VAC d) 208 VAC |
B) 28 VDC
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