2291 + Mcqs in Digital Electronics McqOptions

1.	The simplified form of .
A.	True
B.	False
Answer» C.

Discussion

2.	The carry output of each adder in a ripple adder provides an additional sum output bit.
A.	True
B.	False
Answer» B. False

Discussion

3.	A good rule of thumb for determining the pin numbers of dual-in-line package IC chips would be to place the notch to your right and pin #1 will always be in the lower right corner.
A.	True
B.	False
Answer» C.

Discussion

4.	Shift registers are used to store and transfer data.
A.	True
B.	False
Answer» B. False

Discussion

5.	The modulus of a counter is the actual number of states in its sequence.
A.	True
B.	False
Answer» B. False

Discussion

6.	The concept of a counter to implement a digital one-shot using HDL is not used.
A.	True
B.	False
Answer» C.

Discussion

7.	All flip-flops in an asynchronous counter change states at the same time.
A.	True
B.	False
Answer» C.

Discussion

8.	A glitch is a short pulse resulting in an undesired result in a digital circuit.
A.	True
B.	False
Answer» B. False

Discussion

9.	The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for QB is shown by waveform ________.
A.	synchronous, a
B.	asynchronous, b
C.	synchronous, c
D.	asynchronous, d
Answer» D. asynchronous, d

Discussion

10.	Asynchronous counters are often called ________ counters.
A.	toggle
B.	ripple
C.	binary
D.	flip-flop
Answer» C. binary

Discussion

11.	The given circuit is a(n) ________.
A.	three-bit synchronous binary counter
B.	eight-bit asynchronous binary flip-flop
C.	two-bit asynchronous binary counter
D.	four-bit asynchronous binary counter
Answer» E.

Discussion

12.	Three cascaded modulus-10 counters have an overall modulus of 1000.
A.	True
B.	False
Answer» B. False

Discussion

13.	A reliable method for eliminating decoder spikes is to use strobing.
A.	True
B.	False
Answer» B. False

Discussion

14.	An asynchronous counter differs from a synchronous counter in the method of clocking.
A.	True
B.	False
Answer» B. False

Discussion

15.	The terminal count of a typical modulus-10 binary counter is 1010.
A.	True
B.	False
Answer» C.

Discussion

16.	One characteristic of a ring counter is that the modulus is equal to the number of flip-flops in the register and, consequently, there are never any unused or invalid states.
A.	True
B.	False
Answer» C.

Discussion

17.	In a full-featured counter in HDL, the concept of rolling over simply means the count sequence has reached its limit and must start over at the beginning of the sequence.
A.	True
B.	False
Answer» B. False

Discussion

18.	The 7447 has a 4-bit BCD input, seven individual active-LOW outputs, and a ripple blanking input and output.
A.	True
B.	False
Answer» B. False

Discussion

19.	Dependency notation is no longer used.
A.	True
B.	False
Answer» C.

Discussion

20.	Asynchronous counters are known as modulus counters.
A.	True
B.	False
Answer» C.

Discussion

21.	To cascade is to connect in parallel.
A.	True
B.	False
Answer» C.

Discussion

22.	Cascade means to connect the Q output of one flip-flop to the clock input of the next.
A.	True
B.	False
Answer» B. False

Discussion

23.	In a synchronous counter, each state is clocked by the same pulse.
A.	True
B.	False
Answer» B. False

Discussion

24.	Basic counters can be cascaded in parallel to increase the number of data bits that the counter can handle.
A.	True
B.	False
Answer» C.

Discussion

25.	In a 74192 BCD decade up-/down-counter, the terminal count up and the terminal count down are active-LOW.
A.	True
B.	False
Answer» B. False

Discussion

26.	All decade counters are BCD counters.
A.	True
B.	False
Answer» C.

Discussion

27.	Shift register counters use logic functions to reset the registers when the desired count is reached.
A.	True
B.	False
Answer» C.

Discussion

28.	Generally speaking, the synchronous counter requires more circuitry than an asynchronous counter.
A.	True
B.	False
Answer» B. False

Discussion

29.	A parallel in/serial out shift register enters all data bits simultaneously and transfers them out one bit at a time.
A.	True
B.	False
Answer» B. False

Discussion

30.	Another term used to describe up/down counters is bidirectional.
A.	True
B.	False
Answer» B. False

Discussion

31.	When implementing a complete system application using IC counter chips, output devices such as LED indicators must be configured to operate from the counter outputs.
A.	True
B.	False
Answer» C.

Discussion

32.	Bidirectional shift registers can shift data either right or left.
A.	True
B.	False
Answer» B. False

Discussion

33.	A state diagram is a table of states.
A.	True
B.	False
Answer» C.

Discussion

34.	A ripple counter is an asynchronous counter.
A.	True
B.	False
Answer» B. False

Discussion

35.	In a multiplexer, the data select control inputs are responsible for determining which data input is selected to be transmitted to the data output line.
A.	True
B.	False
Answer» B. False

Discussion

36.	Before you can make a design you must decide if you want an active-HIGH output.
A.	True
B.	False
Answer» B. False

Discussion

37.	The microcontroller needs to use only three input lines to monitor eight separate points.
A.	True
B.	False
Answer» B. False

Discussion

38.	A BCD is used for communication between a computer and a human being because it is too easy to deal with arithmetically.
A.	True
B.	False
Answer» C.

Discussion

39.	A demultiplexer takes a dual input data value and routes it to one of several outputs.
A.	True
B.	False
Answer» C.

Discussion

40.	Digital systems have ________.
A.	one state
B.	two states
C.	three states
D.	four states
Answer» C. three states

Discussion

41.	Digital systems are called ________.
A.	binary systems
B.	logic systems
C.	numbering systems
D.	ADC systems
Answer» C. numbering systems

Discussion

42.	1/4 as a binary number would be ________.
A.	0.01
B.	0.11
C.	0.10
D.	0.00
Answer» B. 0.11

Discussion

43.	The voltage levels used to represent binary values (0 and 1) in a digital system are nearly equal in value.
A.	True
B.	False
Answer» C.

Discussion

44.	In a serial data system, the data is transmitted along a group of conductors simultaneously.
A.	True
B.	False
Answer» C.

Discussion

45.	Temperature variation is normally an analog quantity.
A.	True
B.	False
Answer» B. False

Discussion

46.	The MOD number of a Johnson counter will always be equal to one-half the number of flip-flops in the counter.
A.	True
B.	False
Answer» C.

Discussion

47.	The invalid range for an input to TTL logic is from ________.
A.	0 to 0.8 V
B.	1.2 to 1.6 V
C.	0.8 to 2.0 V
D.	2.0 to 5.0 V
Answer» D. 2.0 to 5.0 V

Discussion

48.	The column weight of the "1" in the hexadecimal number 1AB is ________.
A.	64
B.	256
C.	512
D.	1024
Answer» C. 512

Discussion

49.	The 2's complement of the binary number 1000 is ________.
A.	111
B.	0110
C.	1110
D.	1000
Answer» E.

Discussion

50.	The MSB of 11001 is ________.
A.	1
B.	1100
C.	C
D.	19
E.	<sub>16</sub>
Answer» B. 1100

Discussion

Explore topic-wise MCQs in Testing Subject.

The simplified form of .

The carry output of each adder in a ripple adder provides an additional sum output bit.

A good rule of thumb for determining the pin numbers of dual-in-line package IC chips would be to place the notch to your right and pin #1 will always be in the lower right corner.

Shift registers are used to store and transfer data.

The modulus of a counter is the actual number of states in its sequence.

The concept of a counter to implement a digital one-shot using HDL is not used.

All flip-flops in an asynchronous counter change states at the same time.

A glitch is a short pulse resulting in an undesired result in a digital circuit.

The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for QB is shown by waveform ________.

Asynchronous counters are often called ________ counters.

The given circuit is a(n) ________.

Three cascaded modulus-10 counters have an overall modulus of 1000.

A reliable method for eliminating decoder spikes is to use strobing.

An asynchronous counter differs from a synchronous counter in the method of clocking.

The terminal count of a typical modulus-10 binary counter is 1010.

One characteristic of a ring counter is that the modulus is equal to the number of flip-flops in the register and, consequently, there are never any unused or invalid states.

In a full-featured counter in HDL, the concept of rolling over simply means the count sequence has reached its limit and must start over at the beginning of the sequence.

The 7447 has a 4-bit BCD input, seven individual active-LOW outputs, and a ripple blanking input and output.

Dependency notation is no longer used.

Asynchronous counters are known as modulus counters.

To cascade is to connect in parallel.

Cascade means to connect the Q output of one flip-flop to the clock input of the next.

In a synchronous counter, each state is clocked by the same pulse.

Basic counters can be cascaded in parallel to increase the number of data bits that the counter can handle.

In a 74192 BCD decade up-/down-counter, the terminal count up and the terminal count down are active-LOW.

All decade counters are BCD counters.

Shift register counters use logic functions to reset the registers when the desired count is reached.

Generally speaking, the synchronous counter requires more circuitry than an asynchronous counter.

A parallel in/serial out shift register enters all data bits simultaneously and transfers them out one bit at a time.

Another term used to describe up/down counters is bidirectional.

When implementing a complete system application using IC counter chips, output devices such as LED indicators must be configured to operate from the counter outputs.

Bidirectional shift registers can shift data either right or left.

A state diagram is a table of states.

A ripple counter is an asynchronous counter.

In a multiplexer, the data select control inputs are responsible for determining which data input is selected to be transmitted to the data output line.

Before you can make a design you must decide if you want an active-HIGH output.

The microcontroller needs to use only three input lines to monitor eight separate points.

A BCD is used for communication between a computer and a human being because it is too easy to deal with arithmetically.

A demultiplexer takes a dual input data value and routes it to one of several outputs.

Digital systems have ________.

Digital systems are called ________.

1/4 as a binary number would be ________.

The voltage levels used to represent binary values (0 and 1) in a digital system are nearly equal in value.

In a serial data system, the data is transmitted along a group of conductors simultaneously.

Temperature variation is normally an analog quantity.

The MOD number of a Johnson counter will always be equal to one-half the number of flip-flops in the counter.

The invalid range for an input to TTL logic is from ________.

The column weight of the "1" in the hexadecimal number 1AB is ________.

The 2's complement of the binary number 1000 is ________.

The MSB of 11001 is ________.

The counter circuit and associated waveforms shown below are for a(n) counter, and the correct output waveform for QB is shown by waveform .