Fcc Element 3 Yellow Questions

Front 1

1A3 – What is the term used to express the amount of electrical energy stored in an electrostatic field?

Back 1

A Joules.

Front 2

2A2 – What will produce a magnetic field?

Back 2

C. A current flowing through a conductor

Front 3

3A1 – What metal is usually employed as a sacrificial anode for corrosion control Purposes?

Back 3

C. Zinc Bar

Front 4

4A4 – what is the purpose of a bypass capacitor

Back 4

C. It removes alternating current by providing a low impedance path to ground.

Front 5

5A1 – What are the most commonly used specifications for a junction Diode

Back 5

D. Maximum forward current and (Peak inverse Voltage)PIV.

Front 6

6A3 – What is the RMS voltage at a common household electrical power outlet?

Back 6

D. 117-V AC

Front 7

7A6 – What type of wave is characterized by a rise time significantly faster that the fall time(or Vice Versa)

Back 7

C. Sawtooth Wave

Front 8

8A1 – What is the term used to identify an AC voltage that would cause the same heating in a resistor as a corresponding value of a DC Voltage?

Back 8

C. Root Means Square(RMS)

Front 9

9B5 - If a current of 3 Amperes flows through a resistor connected to 90 Volts, What is the resistance?

Back 9

B. 30 Ohms

Front 10

10B6 – What is the maximum rated current carrying capacity of a resistor marked “200ohms, 200Watts”?

Back 10

A. 0.316 Amps

Front 11

11B5 – What is the most the actual transmitter frequency could differ from a reading of 156,520,000 hertz on a frequency counter with a time base accuracy of +/-10PPM?

Back 11

B. 1565.20 hz

Front 12

12B2 – At 150 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts?

Back 12

C. +2.5 Volts

Front 13

13B1 – What does the power factor equal in an R-L circuit having 60 degree phase angle between the voltage and the current?

Back 13

C 0.5

Front 14

14B4 – What is the meaning of the term “time constant of an RL circuit”? The time required for the

Back 14

C. current in the circuit to build up to 63.2% of the maximum value.

Front 15

15B3 – What is the time constant of a circuit having a 100-microfarad capacitor and a 470-kilohm resistor in series?

Back 15

C. 47 Seconds

Front 16

16B6 – in rectangular coordinates, what is the impedance of a network composed of a 0.0001-microfarad capacitor in series with a 400-ohm resistor, at 500 kHz?

Back 16

D. 400-j318

Front 17

17B2 – in polar coordinates, what is the impedance of a network composed of a 100-ohm-reactance inductor in series with a 100-ohm resistor?

Back 17

141 ohms, /45 degrees

Front 18

18B4 – What turns ratio does a transformer need in order to match a source impedance of 500 ohms to a load of 10 ohms?

Back 18

A. 7.1 to 1.

Front 19

19C6 – What is a description of an optocoupler?

Back 19

C. An LED and a photosensitive device.

Front 20

20C6 – What is the purpose of a coupling capacitor?

Back 20

A. It blocks direct current and passes alternating current.

Front 21

21C1 – A capacitor is sometimes placed in series with the primary of a power transformer to?

Back 21

A. improve the power factor.

Front 22

22C3 – What device is usually used as a stable reference voltage in a linear voltage regulator?

Back 22

A. Zener Diode.

Front 23

23C5 – What are the three terminals of a TRIAC?

Back 23

D. Gate, anode 1, and anode 2

Front 24

24C2 – What is a common use of a hot-carrier diode?

Back 24

D. VHF and UHF mixers and detectors.

Front 25

25C6 – What does it mean for a transistor to be fully saturated?

Back 25

A. The collector current is at its maximum value.

Front 26

26C4 – What condition exists when a transistor is operating in saturation?

Back 26

A The base emitter junction and collector base junction are forward biased.

Front 27

27C2 – What determines the visible light emitted by and LED junction?

Back 27

D The materials used to construct the device.

Front 28

28C6 – In which oscillator circuit would you find a quartz crystal?

Back 28

B Pierce

Front 29

29D3 – How could voltage be greater across reactance in series than the applied voltage?

Back 29

D Resonance

Front 30

30D1 – What is the main advantage of using an op-amp audio filter over a passive LC audio filter?

Back 30

D Op-amps exhibit gain rather than insertion loss.

Front 31

31D6 – What is the definition of a phase-locked loop (PLL) circuit?

Back 31

D A servo loop consisting of a phase detector, a low-pass filter, and voltage-controlled oscillator.

Front 32

32D4 – In figure 3D9, determine if there is a problem with this regulated power supply.

Back 32

There is no problem.

Front 33

33E6 – What do the initials TTL stand for?

Back 33

B Transistor-transistor logic

Front 34

34E5 – What is the characteristic of a NOT gate?

Back 34

B Produces a logic “0” at its output when the input is logic “1” and vice versa.

Front 35

35E1 – In a negative-logic circuit, what level is used to represent a logic 0?

Back 35

D High level

Front 36

36E2 – What is a flip-flop circuit? A binary sequential logic element with stable states.

Back 36

C 2

Front 37

37E3 – What is a monostable multivibrator?

Back 37

A. A circuit that can be switched momentarily to the opposite binary state and then returns after a set period of time to its original state.

Front 38

38E5 – How many individual memory cells would be contained in a memory IC that has 4 data bus input/output pins and 4 address pins for connection to the address bus?

Back 38

D 64

Front 39

39E6 – What circuit interconnects the microprocessor with the memory and the input/output system?

Back 39

C Data bus line

Front 40

40E2 – What does the term BCD mean?

Back 40

C Binary coded decimal

Front 41

41F6 – What is the term for the ratio between the largest tolerable receiver input signal and the minimum discernable signal?

Back 41

D Dynamic Range

Front 42

42F4 – Too much gain in a VHF receiver front end could result in this

Back 42

D Susceptibility of intermodulation interference from nearby transmitters.

Front 43

43F5 – What condition must exist for a circuit to oscillate?

Back 43

D Have sufficient positive feedback.

Front 44

44F1 – What is the image frequency if the normal channel is 151.000 MHz, the IF is operating at 11,000 MHz, and the LO is at 140.000 MHz?

Back 44

B 129.000 MHz

Front 45

45F3 – A receiver selectivity of 2.4 kHz in the IF circuitry is optimum for what type of signals?

Back 45

C SSB Voice

Front 46

46F2 – What factors should be considered when selecting an intermediate frequency?

Back 46

C Image rejection and selectivity.

Front 47

47F1 – A good crystal band-pass filter for a single-sideband phone would be?

Back 47

B 2.1 KHz

Front 48

48F6 – What is the definition of detection in a radio receiver?

Back 48

B The recovery of intelligence from the modulated RF signal.

Front 49

49F2 – What is the purpose of de-emphasis in the receiver audio stage?

Back 49

B When coupled with the transmitter pre-emphasis, flat audio and noise reduction is received.

Front 50

50F4 – What is cross-modulation interference?

Back 50

C Modulation from an unwanted signal heard in addition to the desired signal.

Front 51

51G6 – Which class of amplifier has an operating angle of more than 180 degrees but less than 360 degrees when driven by a sine wave signal?

Back 51

D. Class AB

Front 52

52G4 – What is the approximate DC input power to a Class AB RF power amplifier stage in an unmodulated carrier transmitter when the PEP output power is 500 watts?

Back 52

D. 1000 watts

Front 53

53G5 – How can a single-sideband phone signal be generated?

Back 53

D. By using a balanced modulator followed be a filter.

Front 54

54G3 – What is the resonant frequency in an electrical circuit?

Back 54

A. The frequency at which capacitive reactance equals inductive reactance.

Front 55

55G1 – What will occur when a non-linear amplifier is used with a single-sideband phone transmitter?

Back 55

D. Distortion

Front 56

56G2 – How can parasitic oscillations be eliminated in a power amplifier?

Back 56

C. By neutralization.

Front 57

57H6 – In an FM-phone signal, what is the term for the maximum deviation from the carrier frequency divided by the maximum audio modulating frequency?

Back 57

C. Deviation ratio.

Front 58

58H2 – In figure 3H17, which block diagram symbol (labeled 1 through 4) represents where audio intelligence is inserted?

Back 58

B. 2

Front 59

59H4 – Which of the following best describes a pulse modulation system?

Back 59

A. The peak transmitter power is normally much greater than the average power.

Front 60

60I1 – When a lead-acid storage battery is being charged, a harmful effect to human is:

Back 60

D. Emission of hydrogen gas.

Front 61

61I1 – When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units?

Back 61

A. 1.8 hours

Front 62

62I5 – A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current?

Back 62

C. 26.300 amps.

Front 63

63J4 – What I san advantage of using a trap antenna?

Back 63

A. It may be used for multiband operation.

Front 64

64J2 – The voltage produced in a receiving antenna is:

Back 64

D. Always proportional to the received field strength.

Front 65

65J3 – An excited 1/2 wavelength antenna produces:

Back 65

C. Both electro-magnetic and electro-static fields.

Front 66

66J6 – If a transmission line has a power loss of 6 dB per 100 feet, what is the power at the feed point to the antenna at the end of a 200 foot transmission line fed be a 100 watt transmitter?

Back 66

D. 6 watts.

Front 67

67J1 – What is the effective radiated power of a repeater with 50 watts transmitter power output, 4 dB feed line loss, 3 dB duplexer and circulator loss, and 6 dB antenna gain?

Back 67

B. 39.7 watts.

Front 68

68K5 – What radio navigation aid determines the distance from an aircraft to a selected VORTAC station by measuring the length of time the radio signal takes to travel to and from the station?

Back 68

D. Distance Measuring Equipment (DME).

Front 69

69K6 – What is the main underlying operating principle of the Very-high-frequency Omnidirectional Range (VOR) aircraft navigational system?

Back 69

C. A phase difference between two AC voltages may be used to determine an aircraft’s azimuth position in relation to a selected VOR station.

Front 70

70K2 – What is the frequency range of the marker beacon system used to indicate an aircraft’s position during an Instrument Landing System (ILS) approach to an airports runway?

Back 70

C. The outer, the middle, and the inner marker beacon’s carrier frequencies are all 75 MHz but the marker beacons are 95% tone-modulated at 400 Hz (outer), 1300 Hz (middle), and 3000 Hz (inner).

Front 71

71K3 – What are the transmit and receive frequencies of an aircraft’s mode C transponder operating in the Air Traffic Control RADAR Beacon System (ATCRBS)?

Back 71

A. Transmit at 1090 MHz and receive at 1030 MHz

Front 72

72K1 – What type of antenna pattern is radiated from a ground station phased-array directional antenna when transmitted the PPM pulses in a Mode S interrogation signal of an aircraft’s Traffic alert and Collision Avoidance System (TCAS) installation? – D. 1030 MHz directional pattern.

Back 72

D. 1030 MHz directional pattern.

Front 73

73K5 – What type of antenna is used in an aircraft’s Very high Frequency Omnidirectional Range (VOR) and Localizer (LOC) installation?

Back 73

B. Horizontally polarized omni-directional reception antenna.

Front 74

74L2 – A 50 microampere meter movement has an internal resistance of 2000 ohms. What applied voltage is required to indicate half-scale deflection? – D. 0.05 volts.

Back 74

D. 0.05 volts.

Front 75

75L4

Back 75

On an analog wattmeter, what part of the scale is most accurate and how much does that accuracy extend to the rest of the reading scale. A only at full scale

Front 76

76L5 – An oscilloscope can be used to accomplish all of the following except?

Back 76

C. measure velocity of light with the aid of a light emitting diode.

Front 77

77L6 – What instrument is commonly used by radio service technicians to monitor frequency, modulation, check receiver sensitivity, distortion, and to generate audio tones?

Back 77

C. Service Monitor

Front 78

78L2 – Which of the following answers is true?

Back 78

B. The RF power reading on a CDMA radio is not accurate on an analog power meter.

Front 79

79L4 – the Ideal method of removing insulation from the wire is?

Back 79

A. The thermal stripper

Front 80

80L1 – What color is the binder for pairs 51-75 in a 100 pair cable?

Back 80

D. green

Front 81

81L3 – A common method of programming portable or mobile radios is to use a?

Back 81

A. Laptop

Front 82

82M5 – Which of the following statements about SSB voice transmission is correct?

Back 82

C They normally use J3E emissions, which consists of one sideband and a suppressed carrier.

Front 83

83M2 – The GSM (Global System for Mobile Communications) uses what type of CODEC for digital mobile radio system communications?

Back 83

A. Regular-Pulse Excited

Front 84

84M4 – Which is the code used for SITOR-A and –B transmissions?

Back 84

C. Each character consists of 7 bits with 4 “zeros” and 3 “ones”.

Front 85

85N3 – What VHF Channel is used for Digital Selective Calling and acknowledgement?

Back 85

C. 70

Front 86

86N1 – What is a common occurrence when voice-testing an SSB aboard a boat?

Back 86

B. Voltage panel indicator lamps may glow with each syllable.

Front 87

87N4 – Which piece of required GMDSS equipment is the primary source of transmitting locating signals?

Back 87

D. An EPIRB transmitting on 406 MHZ.

Front 88

88N2- What is the standard scan rate for High-frequency 3 MHZ-23MHZ weather facsimile reception from shore stations?

Back 88

B. 120 lines per minute.

Front 89

89N5 An NMEA 2000 system with devices in a single location may be powered using this method.

Back 89

End-Powered Network

Front 90

90O3 – What is the normal range of pulse widths?

Back 90

B .05 micro to 1.0 micro

Front 91

91O6 – The component or circuit providing the transmitter output power for a RADAR system is the?

Back 91

D Magnetron

Front 92

92O5 – What pulse width and repetition rate should you use at short ranges?

Back 92

C Narrow pulse width and fast repetition rates.

Front 93

93O2 – What type of antenna or pickup device is used to extract the RADAR signal from the waveguide?

Back 93

A J-Hook

Front 94

94O4 – Which of the following is not a precaution that should be taken to ensure the magnetron is not weakened?

Back 94

C Keep the TR properly tuned

Front 95

95P1 – What is the orbiting altitude of the Iridium satellite communications system?

Back 95

D 485 miles

Front 96

96P6 – Which of the following conditions can render INMARSAT–B communications impossible?

Back 96

D all of these.

Front 97

97P5 – When INMARSAT-B and INMARSAT-C terminals are compared

Back 97

A INMARSAT-C antennas are small and omni-directional, while INMARSAT-B antennas are larger and directional

Front 98

98P3 – How many GPS satellites are normally in operation?

Back 98

C 24

Front 99

99Q4 – At what aggregate power level is an MPE (Maximum Permissible Exposure) study required?

Back 99

A 1,000 Watts ERP

Front 100

100Q6 – What is a GFI electrical socket used for?

Back 100

A To prevent electrical shock by sensing ground path circuit and shutting the circuit down.