Principles of Electronic Communication Systems 4th Edition Frenzel Test Bank
Follow Below Link to
Download File
Email us for original and Plagiarism Free
Work At ( info.homeworklance@gmail.com ) or order us at
View Sample Chapter Below:
1.
There are only a few
modulator circuits developed that will cause the carrier amplitude to be varied
in accordance with the modulating information signal.
FALSE
2.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
If the gain of an
amplifier or the attenuation of a voltage divider is varied in accordance with
a modulating signal plus 1, AM will be produced.
TRUE
3.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
One way to generate
the product of the carrier and modulating signal is to apply both signals to a
linear component or circuit.
TRUE
4.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
A nonlinear circuit is
one in which the current is not directly proportional to the voltage.
TRUE
Blooms: 4. Analyze
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
5.
Diodes and transistors
whose function is not a pure square-law function produce harmonics known as
intermodulation products.
TRUE
6.
Blooms: 1. Remember
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
High-level modulators
produce AM at high power levels, usually in the final amplifier stage of a
transmitter.
TRUE
7.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
One of the more
complicated high-level amplitude modulators is the diode modulator.
FALSE
8.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
A transistor modulator
is used because the transistor circuit provides gain.
TRUE
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
9.
PIN diodes are a special
type of germanium diode for use at frequencies below approximately 100 MHz.
FALSE
10.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
A differential
amplifier modulator makes an excellent amplitude modulator.
TRUE
11.
A.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
The outputs of a
differential amplifier taken from collectors to ground are
in phase
B.
45° out of phase
C.
90° out of phase
D.
180° out of phase
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
12.
A.
Which of the following
is not an advantage of using a differential amplifier as an amplitude
modulator?
high gain
B.
excellent selectivity
C.
good linearity
D.
can be modulated 100
percent
13.
A.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
In high-level AM, the
modulator varies the voltage and power in the
carrier oscillator
B.
audio amplifier
C.
intermediate RF
amplifier
D.
final RF amplifier
Blooms: 4. Analyze
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
14.
A.
If a class C amplifier
has an input of 1000 W, the modulator must be able to deliver
100 W
B.
200 W
C.
400 W
D.
500 W
15.
A.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.03 Amplitude Demodulators
Subtopic: Amplitude Demodulators
Topic: Amplitude Modulator and Demodulator Circuits
Circuits that accept
modulated signals and recover the original modulating information are called
modulators
B.
detectors
C.
nonlinear circuits
D.
balanced filters
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.03 Amplitude Demodulators
Subtopic: Amplitude Demodulators
Topic: Amplitude Modulator and Demodulator Circuits
16.
A.
The crystal component
of the crystal radio receivers that were widely used in the past is the
capacitor
B.
transistor
C.
diode
D.
integrated circuit
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.03 Amplitude Demodulators
Subtopic: Amplitude Demodulators
Topic: Amplitude Modulator and Demodulator Circuits
17.
How is the noninverted
AM output of positive half-cycles in the circuit shown in Fig. 4-21 fed to the
load?
A.
clock turns on switch
A
B.
clock turns on switch
B
C.
inverting amp turns on
D.
noninverting amp turns
off
Blooms: 4. Analyze
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.03 Amplitude Demodulators
Subtopic: Amplitude Demodulators
Topic: Amplitude Modulator and Demodulator Circuits
18.
A.
What is the result
(output) for the circuit shown in Fig. 4-21?
half-wave
rectification of the signal
B.
full-wave
rectification of the signal
C.
dc
D.
ac
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.04 Balanced Modulators
Subtopic: Balanced Modulators
Topic: Amplitude Modulator and Demodulator Circuits
19.
A circuit that
generates a DSB signal, suppresses the carrier and leaves only sum and difference
frequencies at the output is the
A.
unbalanced detector
B.
balanced modulator
C.
carrier recovery
circuit
D.
demodulator
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.04 Balanced Modulators
Subtopic: Balanced Modulators
Topic: Amplitude Modulator and Demodulator Circuits
20.
A.
In DSB and SSB, the
carrier that was suppressed at the DSB and SSB transmitter
must be reinserted at
the receiver
B.
must be transmitted
after the signal was received
C.
must be replaced by a
pilot carrier
D.
must be lower than
1500 kHz
Blooms: 1. Remember
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.04 Balanced Modulators
Subtopic: Balanced Modulators
Topic: Amplitude Modulator and Demodulator Circuits
21.
The 1496/1596 IC
balanced modulator can work at carrier frequencies up to approximately 100 or one-hundred
22.
23.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.04 Balanced Modulators
Subtopic: Balanced Modulators
Topic: Amplitude Modulator and Demodulator Circuits
The 1496 IC is one of
the most versatile circuits available for communication applications.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.04 Balanced Modulators
Subtopic: Balanced Modulators
Topic: Amplitude Modulator and Demodulator Circuits
Analog multipliers are
often used to generate DSB signals.
Blooms: 1. Remember
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.04 Balanced Modulators
Subtopic: Balanced Modulators
Topic: Amplitude Modulator and Demodulator Circuits
24.
In large-scale
integrated circuits in which complete receivers are put on a single silicon
chip, the circuitry is likely to be implemented with MOSFETs.
25.
26.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.05 SSB Circuits
Subtopic: SSB Circuits
Topic: Amplitude Modulator and Demodulator Circuits
The simplest and most
widely used method of generating SSB signals is the filter method.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.05 SSB Circuits
Subtopic: SSB Circuits
Topic: Amplitude Modulator and Demodulator Circuits
One SSB transmitter
sideband selection method is to provide two carrier oscillator frequencies.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.05 SSB Circuits
Subtopic: SSB Circuits
Topic: Amplitude Modulator and Demodulator Circuits
27.
The phasing method of SSB generation uses a
phase-shift technique that causes one of the sidebands to be canceled out.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.05 SSB Circuits
Subtopic: SSB Circuits
Topic: Amplitude Modulator and Demodulator Circuits
28.
A phase shifter is
usually an RC network that causes the output to either lead or lag the input
by 90 or ninety
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.05 SSB Circuits
Subtopic: SSB Circuits
Topic: Amplitude Modulator and Demodulator Circuits
29.
The output of a
phasing detector is a low-level SSB and must be applied to a linear RF amplifier before being applied to the
transmitting antenna.
Blooms: 1. Remember
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.05 SSB Circuits
Subtopic: SSB Circuits
Topic: Amplitude Modulator and Demodulator Circuits
30.
The balanced modulator
is called a(n) product detector
because it is used to recover the modulating signal rather than generate a
carrier that will transmit it.
31.
32.
33.
34.
35.
Blooms: 1. Remember
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
The modulation index is the ratio of the modulating signal
amplitude to the carrier amplitude.
Blooms: 1. Remember
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
To produce AM, a
carrier and modulating signals are added and applied to a nonlinear device.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
Modulation is
a(n) multiplication process.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Medium
Section: 04.01 Basic Principles of Amplitude Modulation
Subtopic: Basic Principles of Amplitude Modulation
Topic: Amplitude Modulator and Demodulator Circuits
A(n) differential amplifier modulator makes an excellent
amplitude modulator.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Hard
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
A major disadvantage
of collector modulators is the need for a modulation transformer.
Blooms: 2. Understand
Chapter: 04 Amplitude Modulator and Demodulator Circuits
Difficulty: Easy
Section: 04.02 Amplitude Modulators
Subtopic: Amplitude Modulators
Topic: Amplitude Modulator and Demodulator Circuits
|
Category
|
# of Questions
|
|
|
Blooms: 1. Remember
|
6
|
|
|
Blooms: 2.
Understand
|
26
|
|
|
Blooms: 4. Analyze
|
3
|
|
|
Chapter: 04
Amplitude Modulator and Demodulator Circuits
|
35
|
|
|
Difficulty: Easy
|
10
|
|
|
Difficulty: Hard
|
9
|
|
|
Difficulty: Medium
|
16
|
|
|
Section: 04.01 Basic
Principles of Amplitude Modulation
|
8
|
|
|
Section: 04.02
|
Amplitude Modulators
|
11
|
|
Section: 04.03
|
Amplitude
Demodulators
|
4
|
|
Section: 04.04
|
Balanced Modulators
|
6
|
|
Section: 04.05
|
SSB Circuits
|
6
|
|
Subtopic: Amplitude Demodulators
|
4
|
|
|
Subtopic: Amplitude
Modulators
|
11
|
|
|
Subtopic: Balanced
Modulators
|
6
|
|
|
Subtopic: Basic
Principles of Amplitude Modulation
|
8
|
|
|
Subtopic: SSB
Circuits
|
6
|
|
|
Topic: Amplitude
Modulator and Demodulator Circuits
|
35
|
|
Comments
Post a Comment