Digital Electronics Online Exam Quiz

Important questions about Digital Electronics. Digital Electronics MCQ questions with answers. Digital Electronics exam questions and answers for students and interviews.

1. A device which converts BCD to seven segment is called

Options

A : encoder

B : decoder

C : multiplexer

D : none of these

2. A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is

Options

A : 2.44 mV

B : 24.4 mV

C : 1.2 V

D : none of the above

3. In a 7 segment display, LEDs b and c lit up. The decimal number displayed is

Options

A : 9

B : 7

C : 3

D : 1

4. BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are

Options

A : a, b, d

B : a, b, c

C : all

D : a, b, g, c, d

5. 7BF 16 = __________ 2

Options

A : 0111 1011 1110

B : 0111 1011 1111

C : 0111 1011 0111

D : 0111 1011 0011

7. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is

Options

A : 2 and 7

B : 3 and 7

C : 1 and 6

D : 3 and 6

9. AB + A B =

Options

A : B

B : A

C : 1

D : 0

10. A three state switch has three outputs. These are

Options

A : low, low and high

B : low, high, high

C : low. floating, low

D : low, high, floating

2. In register index addressing mode the effective address is given by

Options

A : index register value

B : sum of the index register value and the operand

C : operand

D : difference of the index register value and the operand

3. Both OR and AND gates can have only two inputs.

Options

A : True

B : False

C :

D :

4. The number of digits in octal system is

Options

A : 8

B : 7

C : 9

D : 10

5. In 2's complement representation the number 11100101 represents the decimal number

Options

A : +37

B : -31

C : +27

D : -27

6. 1's complement of 11100110 is

Options

A : 00011001

B : 10000001

C : 00011010

D : 00000000

7. A full adder can be made out of

Options

A : two half adders

B : two half adders and a OR gate

C : two half adders and a NOT gate

D : three half adders

9. The hexadecimal number (3E8) 16 is equal to decimal number

Options

A : 1000

B : 982

C : 768

D : 323

10. A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is

Options

A : 2

B : 4

C : 8

D : 18

1. 2's complement of binary number 0101 is

Options

A : 1011

B : 1111

C : 1101

D : 1110

2. In a ripple counter,

Options

A : whenever a flip flop sets to 1, the next higher FF toggles

B : whenever a flip flop sets to 0, the next higher FF remains unchanged

C : whenever a flip flop sets to 1, the next higher FF faces race condition

D : whenever a flip flop sets to 0, the next higher FF faces race condition

3. Which device has one input and many outputs?

Options

A : Multiplexer

B : Demultiplexer

C : Counter

D : Flip flop

5. For the minterm designation Y = ? m (1, 3, 5, 7) the complete expression is

Options

A : Y = A B C + A B C

B : Y = A B C + A B C + ABC + A BC

C : Y = A B C + A B C + A BC + A B C

D : Y = A B C + ABC + A B C + A B C

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