EXELIS Wireless Electronics MCQs
EXELIS Wireless Electronics MCQs
These EXELIS Wireless Electronics multiple-choice questions and their answers will help you strengthen your grip on the subject of EXELIS Wireless Electronics. You can prepare for an upcoming exam or job interview with these 30 EXELIS Wireless Electronics MCQs.
So scroll down and start answering.
1: Which class of an amplifier provides the highest efficiency?
A. Class C
B. Class A
C. Class AB
D. Class BÂ
2: What is the primary advantage of the Chebyshev filter over the Butterworth filter?
A. It requires only capacitors
B. It requires only inductors
C. It allows ripple in the passband in return for steeper skirts
D. It has maximally flat response over the passband
3: In a frequency modulation receiver, the _________ is connected to the input of the radio frequency amplifier
A. mixer
B. frequency discriminator
C. antenna
D. limiter
4: In a single sideband and CW receiver, the _____________ is in between the mixer and intermediate frequency amplifier.
A. filter
B. radio frequency amplifier
C. beat frequency oscillator
D. product detector
5: Which of the following filter types is not suited to audio and low radio frequencies?
A. Elliptical
B. Chebyshev
C. Cavity
D. Butterworth
6: What is the primary advantage of the Butterworth filter over the Chebyshev filter?
A. It requires only inductors
B. It requires only capacitors
C. It has maximally flat response over its passband
D. None of the above
7: Which of the following bipolar transistor amplifier circuits is similar to a field-effect transistor (FET) amplifier common source circuit?
A. Common collector
B. Common base
C. Common mode
D. Common emitter
8: In a frequency modulation receiver, the output of the high frequency oscillator is fed to the:
A. radio frequency amplifier
B. limiter
C. antenna
D. mixer
9: In the common emitter amplifier, when the input and output signals are compared, the output signal lags the input signal by 90 degrees.
A. True
B. FalseÂ
10: Which of the following is the principal use of an op-amp RC active filter circuitry?
A. Op-amp circuits are used as low-pass filters at the output of transmitters
B. Op-amp circuits are used as audio filters for receivers
C. Op-amp circuits are used as filters for smoothing power supply output
D. Op-amp circuits are used as high-pass filters to block RFI at the input of receivers
11: In a frequency modulation receiver, the __________ is in between the antenna and mixer.
A. audio frequency amplifier
B. high frequency oscillator
C. intermediate frequency amplifier
D. radio frequency amplifier
12: In a frequency modulation receiver, the output of the___________ is connected to the mixer.
A. frequency discriminator
B. intermediate frequency amplifier
C. speaker and/or headphones
D. high frequency oscillator
13: For what portion of a signal cycle does a Class A amplifier operate?
A. Exactly 180 degrees
B. More than 180 degrees, but less than 360 degrees
C. The entire cycle
D. Less than 180 degreesÂ
14: Which of the following terms is most appropriate for a high gain, direct-coupled differential amplifier, the characteristics of which are determined by the components mounted externally?
A. Difference amplifier
B. Operational amplifier
C. High gain audio amplifier
D. Summing amplifier
15: What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?
A. 400 watts
B. 100 watts
C. 1000 watts
D. 200 wattsÂ
16: What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?
A. 1250 watts
B. 625 watts
C. 2500 watts
D. 500 wattsÂ
17: What are the advantages of using an op-amp instead of LC elements in an audio filter?
A. Op-amps are more rugged and can withstand more abuse than the LC elements
B. Op-amps are fixed at one frequency
C. Op-amps exhibit gain rather than insertion loss
D. None of the aboveÂ
18: In a frequency modulation receiver, the_________ is in between the mixer and intermediate frequency amplifier.
A. filter
B. limiter
C. frequency discriminator
D. radio frequency amplifier
19: In a single sideband transmitter, the output of the _________ is connected to the mixer.
A. variable frequency oscillator
B. radio frequency oscillator
C. linear amplifier
D. antenna
20: Which of the following is/are the primary function(s) of the crystal band-pass filters?
A. Increasing spurious radiation power from the transmitter.
B. Channel selection.
C. Increasing saturation of the front-end receiver.
D. All of the above.
21: What are the three general groupings of filters?
A. Hartley, Colpitts, and Pierce
B. Audio, Radio, and Capacitive
C. High-pass, Low-pass, and Band-pass
D. Inductive, Capacitive, and ResistiveÂ
22: What determines the input impedance of an FET common- source amplifier?
A. The input impedance is essentially determined by the resistance between the source and the substrate
B. The input impedance is essentially determined by the resistance between the source and the drain
C. The input impedance is essentially determined by the gate biasing network
D. The input impedance is essentially determined by the resistance between the drain and the substrate
23: In which of the following situations are helical filters used in wireless communication?
A. When miniaturization and low-loss characteristics are in high demand.
B. When high-level of power handling is needed.
C. When miniaturization and low-loss characteristics are not required.
D. When high-level of power handling is not needed.
24: In a single sideband transmitter, the output of the ___________ is connected to the balanced modulator.
A. filter
B. variable frequency oscillator
C. speech amplifier
D. linear amplifier
25: In a single sideband and CW receiver, the __________ is connected to the output of the audio frequency amplifier.
A. speaker and/or headphones
B. mixer
C. radio frequency amplifier
D. beat frequency oscillator
26: In a single sideband transmitter, the output of the variable frequency oscillator is connected to the __________.
A. antenna
B. balanced modulator
C. linear amplifier
D. mixer
27: What is the input impedance of a theoretically ideal op-amp?
A. Very low
B. Exactly 100 ohms
C. Exactly 1000 ohms
D. Very highÂ
28: An FM wave with single-tone modulation has
A. two sideband frequencies
B. four sideband frequencies
C. one sideband frequency
D. infinite sideband frequencies
29: While using a deviation meter, it is important to know the:
A. modulating frequency and modulation index
B. modulation index
C. modulating frequency
D. pass-band of the IF filter
30: In a single sideband transmitter, the output of the linear amplifier is connected to the ______________
A. antenna
B. filter
C. variable frequency oscillator
D. speech amplifier
31: Two amplifiers with gains of 10 dB and 40 dB are connected in cascade. The gain of the combination is:
A. 8 dB
B. 30 dB
C. 50 dB
D. 400 dBÂ
32: In a single sideband and CW receiver, the output of the ___________ is connected to the product detector.
A. mixer
B. beat frequency oscillator
C. radio frequency amplifier
D. audio frequency amplifier
33: In a single sideband and CW receiver, the __________ is connected to the output of the product detector
A. intermediate frequency amplifier
B. audio frequency amplifier
C. high frequency oscillator
D. radio frequency amplifier
34: What is the total bandwidth of an FM-phone transmission having a 5-kHz deviation and 3-kHz modulating frequency?
A. 8 kHz
B. 5 kHz
C. 16 kHz
D. 3 kHzÂ
35: When does inter-modulation interference between two repeater transmitters usually occur?
A. When the signals are reflected in phase by some aircraft passing overhead
B. When they are in close proximity and the signals cause feedback in one or both of their final amplifiers
C. When they are in close proximity and the signals mix in one or both of their final amplifiers
D. When the signals are reflected out of phase by some aircraft passing overhead
36: What is an inverting op-amp circuit?
A. An operational amplifier circuit connected in such a way that the input and the output signals are 180 degrees out of phase
B. An operational amplifier circuit connected in such a way that the input and the output signals are in phase
C. An operational amplifier circuit connected in such a way that the input and the output signals are 90 degrees out of phase
D. An operational amplifier circuit connected in such a way that the input impedance is held to zero while the output impedance is high
37: What is a non-inverting op-amp circuit?
A. An operational amplifier circuit connected in such a way that the input and the output signals are 90 degrees out of phase
B. An operational amplifier circuit connected in such a way that the input and the output signals are in phase
C. An operational amplifier circuit connected in such a way that the input impedance is held low and the output impedance is high
D. An operational amplifier circuit connected such that the input and the output signals are 180 degrees out of phase
38: What is the output PEP of an unmodulated carrier transmitter if a wattmeter connected to the transmitter output indicates an average reading of 1060 watts?
A. 2120 watts
B. 1500 watts
C. 1060 watts
D. 530 wattsÂ
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EXELIS Wireless Electronics MCQs
