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Signals and Switches MCQ Questions & Answers

Signals and Switches MCQs : This section focuses on the "Signals and Switches". These Multiple Choice Questions (MCQs) should be practiced to improve the Signals and Switches skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

What is a disadvantage of CMOS in place of TTL?

A. It switches slower.
B. It uses less power.
C. It is smaller.
D. cost

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Question 2

How long will it take to serially transmit the hexadecimal number C316 if the clock frequency is 1.5 MHz?

A. 4.69 ms
B. 4.69 s
C. 5.33 ms
D. 5.33 s

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Question 3

In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.

A. time, y, voltage, x
B. voltage, y, time, x

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Question 4

An indication of cutoff in an NPN bipolar transistor is that the:

A. collector current is maximum
B. collector-to-emitter voltage equals zero
C. base-to-emitter voltage equals 0.7 V
D. collector to emitter appears to be open

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Question 5

The family of logic that is composed of bipolar junction transistors is ____.


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Question 6

Internally, a computer's binary data are almost always transmitted on parallel channels, commonly referred to as the:

A. parallel bus
B. serial bus
C. data bus
D. memory bus

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Question 7

To forward bias a diode, a ________ potential is needed on the ________ and a ________ is needed on the ________.

A. negative, cathode, positive, anode
B. negative, anode, positive, cathode

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Question 8

What can a relay provide between the triggering source and the output that semiconductor switching devices cannot?

A. total isolation
B. faster
C. higher current rating
D. total isolation and higher current rating

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Question 9

What is the advantage of using serial data transmission over parallel data transmission?

A. It is slower.
B. Only one pair of wires is required.
C. More people use it.
D. It is faster.

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Question 10

What is the period of a clock waveform that has a frequency of 15.4 kHz?

A. 649 s
B. 6.49 s
C. 64.9 s
D. 0.649 s

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Question 11

Why does the TTL family use a totem-pole circuit on the output?

A. It provides active pull-up.
B. It provides active pull-down.
C. It provides active pull-up and active pull-down.

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Question 12

TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.


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Question 13

What is the advantage of using CMOS logic over TTL?

A. It switches faster.
B. It uses less power.
C. It is larger.
D. cost

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Question 14

A TTL totem-pole circuit is designed so that the output transistors:

A. are always on together
B. provide phase splitting
C. provide voltage regulation
D. are never on together

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Question 15

The units for the HIGH time for a periodic wave are ________.

A. seconds
B. hertz
C. cycles
D. %

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Question 16

Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.

A. positive, negative
B. positive, positive
C. negative, positive
D. negative, negative

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Question 17

The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.


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Question 18

When an IC has two rows of parallel connecting pins, the device is referred to as a:


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Question 19

Which device(s) have almost ideal ON and OFF resistances?

A. electromechanical relays
B. manual switches
C. semiconductor devices (diodes and transistors)
D. electromechanical relays and manual switches

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Question 20

The hexadecimal number 4B16 is transmitted as an 8-bit word in parallel. What is the time required for this transmission if the clock frequency is 2.25 MHz?

A. 444 ns
B. 444 s
C. 3.55 s
D. 3.55 ms

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Question 21

Serial communication can be sped up by:

A. using silver or gold conductors instead of copper
B. using high-speed clock signals
C. adjusting the duty cycle of the binary information
D. using silver or gold conductors instead of copper and high-speed clock signals

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Question 22

With surface-mount technology (SMT), the devices should:

A. utilize transistor outline connections
B. mount directly
C. have parallel connecting pins
D. require holes and pads

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Question 23

A diode placed in parallel across a relay coil serves what function?

A. to regulate input voltage
B. to protect the coil from arcing
C. to ensure most of the current passes through the coil
D. to reduce arcing across the relay contacts

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Question 24

Why is parallel data transmission preferred over serial data transmission for most applications?

A. It is much slower.
B. It is cheaper.
C. More people use it.
D. It is much faster.

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Question 25

What is the minimum voltage required before a diode will allow current to flow between the cathode and the anode?

A. 0.7 V
B. 0.07 V
C. 4.3 V
D. 0.2 V

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Question 26

Why, in most applications, are transistor switches used in place of relays?

A. They consume less power.
B. They are faster.
C. They are quieter and smaller.
D. all of the above

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Question 27

What is used to graphically show the time relationship between two or more digital waveforms?

A. reference diagram
B. timing diagram
C. voltage curve
D. load line

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Question 28

The serial format for transmitting binary information uses:

A. a single conductor
B. multiple conductors
C. infrared technology
D. fiber-optic

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Question 29

The period of a waveform is the percentage of time the signal is HIGH.


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