Quiz On Am And Ssb Modulation
(154).jpg "Quiz On Am And Ssb Modulation")
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- 1.Having an information signal change some characteristic of a carrier signal is called
- A.
Multiplexing
- B.
Modulation
- C.
Duplexing
- D.
Linear Mixing
- 2.Which of the following is not true about AM?
- A.
The carrier amplitude varies
- B.
The carrier frequency remains constant
- C.
The carrier frequency changes
- D.
The information signal amplitude changes the carrier amplitude
- 3.The opposite of modulation is
- A.
Reverse modulation
- B.
Downward modulation
- C.
Unmodulation
- D.
Demodulation
- 4.The circuit used to produce modulation is called a
- A.
Modulator
- B.
Demodulator
- C.
Variable gain amplifier
- D.
Multiplexer
- 5.A modulator circuit performs what mathematical operation on its two inputs?
- A.
Multiplication
- B.
Addition
- C.
Division
- D.
Square root
- 6.The ratio of the peak modulation signal voltage to the peak carrier voltage is referred to as
- A.
The voltage ratio
- B.
Decibels
- C.
The modulation index
- D.
The mix factor
- 7.If m is greater than 1, what happens?
- A.
Normal operation
- B.
Carrier drops to zero
- C.
Carrier frequency shifts
- D.
Information signal is distorted
- 8.For ideal AM, which of the following is true?
- A.
M=0
- B.
M=1
- C.
M is greater than 1
- D.
M is lesser than 1
- 9.The outline of the peaks of a carrier has the shape of the modulating signal and is called the
- A.
Trace
- B.
Waveshape
- C.
Envelope
- D.
Carrier variation
- 10.The new signals produced by modulation are called
- A.
Spurious emissions
- B.
Harmonics
- C.
Intermodulation products
- D.
Sidebands
- 11.A display of signal amplitude versus frequency is called the
- A.
Time domain
- B.
Frequency domain
- C.
Amplitude spectrum
- D.
Frequency domain
- 12.Most of the power in an AM signal is the
- A.
Carrier
- B.
Upper Sideband
- C.
Lower Sideband
- D.
Modulating Signal
- 13.For 100 percent modulation, what percentage of power is in each sideband?
- A.
25 percent
- B.
33.3 percent
- C.
50 percent
- D.
100 percent
- 14.An AM transmitter has a percentage of modulation of 88. The carrier power is 440W. The power in one sideband is
- A.
85W
- B.
110W
- C.
170W
- D.
610W
- 15.In an AM signal, the transmitted information is contained within the
- A.
Carrier
- B.
Modulating Signal
- C.
Sidebands
- D.
Envelope
- 16.An AM signal without the carrier is called a(n)
- A.
SSB
- B.
Vestigial Sideband
- C.
FM signal
- D.
DSB
- 17.What is the minimum AM signal needed to transmit information?
- A.
Carrier plus sidebands
- B.
Carrier only
- C.
One sideband
- D.
Both sideband
- 18.The main advantage of SSB over standard AM or DSB is
- A.
Less spectrum space is used
- B.
Simpler equipment is used
- C.
Less power is consumed
- D.
A higher modulation percentage
- 19.In SSB, which sideband is the best to use?
- A.
Upper
- B.
Lower
- C.
Neither
- D.
Depends upon the use
- 20.The typical audio modulating frequency range used in radio and telephone communications is
- A.
50 Hz to 5 KHz
- B.
50 Hz to 15 KHz
- C.
100 Hz to 10 KHz
- D.
300 Hz to 3 KHz
- 21.Distortion of the modulating signal produces harmonics which cause an increase in the signal
- A.
Carrier power
- B.
Bandwidth
- C.
Sideband power
- D.
Envelope voltage
- 22.The process of translating a signal,with or without modulation, to a higher or lower frequency for processing is called
- A.
Frequency multiplication
- B.
Frequency division
- C.
Frequency shift
- D.
Frequency conversion
- 23.Frequency translation is carried out by a circuit called a
- A.
Translator
- B.
Converter
- C.
Balanced Modulator
- D.
Local Oscillator
- 24.The output power of an SSB transmitter is usually expressed in terms of
- A.
Average power
- B.
RMS power
- C.
Peak to peak power
- D.
Peak envelope power
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