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# Kennedy: MCQ in Pulse Communications

This is the Multiple Choice Questions in Chapter 13: Pulse Communications from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

#### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Indicate which of the following is not a binary code

a. Morse

b. Baudot

c. CCITT-2

d. ARQ

Solution:

2. To permit the selection of 1 out of 16 equi-probable events, the number of bits required is

a. 2

b. log1016

c. 8

d. 4

Solution:

3. A signaling system in which each letter of the alphabet is represented by a different symbol is not used because

a. it would be too difficult for an operator to memorize

b. it is redundant

c. noise would introduce too many errors

d. too many pulses per letter are required

Solution:

4. The Hartley states that

a. the maximum rate of information transmission depends on the channel bandwidth

b. the maximum rate of information transmission depends on the depth of modulation

c. redundancy is essential

d. only binary codes may be used

Solution:

5. Indicate the false statement. In order to combat noise,

a. the channel bandwidth may be increased

b. redundancy may be used

c. the transmitted power may be increased

d. the signaling rate may be reduced

Solution:

6. The most common modulation system used for telegraphy is

a. frequency-shift keying

b. two-tone modulation

c. pulse-code modulation

d. single-tone modulation

Solution:

7. Pulse-width modulation system used for telegraphy is

a. by differentiating pulse-position modulation

b. with a monostable

c. by integrating the signal

d. with a free-running multivibrator

Solution:

8. Indicate which of the following system is digital.

a. Pulse-position modulation

b. Pulse-code modulation

c. Pulse-width modulation

d. Pulse-frequency modulation

Solution:

9. Quantizing noise occurs in

a. time-division multiplex

b. frequency division multiplex

c. pulse-code modulation

d. pulse-width modulation

Solution:

10. The modulation system inherently most noise-resistant is

a. SSB, suppressed-carrier

b. Frequency modulation

c. pulse-position modulation

d. pulse-code modulation

Solution:

11. In order to reduce quantizing noise, one must

a. increase the number of standard amplitudes

b. send pulses whose sides are more nearly vertical

c. use an RF amplifier in the receiver

d. increase the number of samples per second

Solution:

12. The Hartley-Shannon theorem sets a limit on the

a. highest frequency that may be sent over a given channel

b. maximum capacity of a channel with a given noise level

c. maximum number of coding levels in a channel with a given noise level

d. maximum number of quantizing levels in a channel of a given bandwidth

Solution:

13. Indicate which of the following pulse modulation systems is analog

a. PCM

b. Differential PCM

c. PWM

d. Delta

Solution:

14. Companding is used

a. to overcome quarantining noise in PCM

b. in PCM transmitters, to allow amplitude limited in the receivers

c. to protect small signals in PCM from quantizing distortion

d. in PCM receivers, to overcome impulse noise

Solution:

15. The biggest disadvantage of PCM is

a. its inability to handle analog signals

b. the high error rate which its quantizing noise introduces

c. its incompatibility with TDM

d. the large bandwidths that are required for it

Solution:

### Complete List of MCQ in Electronic Communication Systems by Kennedy

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