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Digital Electronics

Description: Digital Electronics for GATE Preparation and Practice Test
Number of Questions: 25
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Tags: Digital Electronics GATE Preparation IC Engines Digital circuits
Attempted 0/25 Correct 0 Score 0

Multiplexer is also known as

  1. data selector

  2. data distributor

  3. decoder

  4. encoder


Correct Option: A

Excess-3 code is

  1. non-weighted code

  2. weighted code

  3. self-complementing code

  4. both (1) and (3)


Correct Option: D

In a sequential circuit, the output depends on

  1. present state only

  2. past inputs only

  3. both (1) and (2)

  4. none of these


Correct Option: C

The decimal number represented by 0.1110 is

  1. .375

  2. .475

  3. .675

  4. .875


Correct Option: D
Explanation:

ans 4

The number of input line required in a decoder, if it has 32 output lines.

  1. 5

  2. 4

  3. 3

  4. 2


Correct Option: A

Find the grey code of the number 011010.

  1. 010101

  2. 101010

  3. 010111

  4. 010110


Correct Option: C

Which flip flop is used to remove the race around condition?

  1. Master slave JK flip flop

  2. T flip flop

  3. D flip flop

  4. SR flip flop


Correct Option: A

How many flip flops are required for mod 5 counter?

  1. 2

  2. 5

  3. 4

  4. 3


Correct Option: D
Explanation:

Correct Answer: 3 2n = MOD, Since we require to count till 5 (101), so 3 flip flops are required.

Even parity Hamming code for the 4 bit binary number is 0111 is

  1. 0001111

  2. 0011111

  3. 1111000

  4. 0101011


Correct Option: A

JK flip flop can be used as a T flip flop, if the inputs at JK flip flop are

  1. J=k=0

  2. j=k=1

  3. both of the above

  4. j=0 ,k=1


Correct Option: C

Demultiplexer is also known as

  1. data selector

  2. data distributor

  3. decoder

  4. encoder


Correct Option: B

The even parity for the number 01110010 is

  1. 0

  2. 1

  3. 2

  4. none


Correct Option: A
Explanation:

Answer 1, since number of 1s is even.

How many flip flop are required for mod 10 counter?

  1. 2

  2. 5

  3. 4

  4. 3


Correct Option: C

A tabulation method specifying inputs required for a flip flop to change from a present state to next state is known as

  1. characteristic equation

  2. excitation table

  3. characteristic table

  4. truth table


Correct Option: B

The count of four bit down counter is 0000. When a clock pulse is applied, its count will be

  1. 0000

  2. 0001

  3. 1111

  4. 1010


Correct Option: C

A four variable logic expression can be realized using which multiplexer?

  1. 16:1

  2. 8:1

  3. 4:1

  4. 32:1


Correct Option: A

In BCD adder, to get the correct BCD sum

  1. binary 6 (0110) is added

  2. binary 9 (1001) is added

  3. no number is added

  4. bianry 1 (001) is added


Correct Option: A

Can a programmable read only memory (PROM) be programmed by the user using PROM programmer or not?

  1. Only once by the user.

  2. Cannot be programmed by the user.

  3. It can be programmed again and again.

  4. Its programming is fixed by the vendor.


Correct Option: A

Programmable array logic(PAL) has

  1. a fixed AND array

  2. a fixed OR array

  3. programmable AND array an fixed OR array

  4. programmable OR array and fixe AND array


Correct Option: C

TTL with which output can be used for wired connection?

  1. Totem pole output

  2. Open collector output

  3. Active pull up

  4. Schottky TTL


Correct Option: B

A unipolar logic family uses which device?

  1. BJT

  2. FET

  3. MOS

  4. IGBT


Correct Option: C

The fastest logic family is

  1. TTL

  2. ECL

  3. RTL

  4. DTl


Correct Option: B

The process of subtraction gets converted into addition by

  1. 1'S complement method

  2. 2'S complement method

  3. 10'S complement method

  4. none of these


Correct Option: B

Race condition may exist in which sequential circuit?

  1. Synchronous sequential circuit

  2. Asynchronous sequential circuit

  3. Both of the above

  4. None of these


Correct Option: B

T flip-flop can be used as

  1. a delay switch

  2. a toggle switch

  3. a simple switch

  4. none of these


Correct Option: B
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