# Quiz On Am And Ssb Modulation

24 Questions | Total Attempts: 2069  Settings  .

• 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.

• 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

Related Topics Back to top