Test: Digital Electronics - 6 | 25 Questions MCQ Test

QUESTION: 1

High speed counter

A. ring counter
B. ripple counter
C. synchronous counter
D. asynchronous counter

Solution:

QUESTION: 2

Registers and counters are similar in the sense that they both

A. count pulses
B. store binary information
C. are made from an array of flip-flops and gates integrated on a single chip
D. are shift registers

Solution:

QUESTION: 3

2's complement representation of a 16 bit number (one sign bit and 15 magnitude bit) is FFFF. Its magnitude in decimal representation is

A. 0
B. 1
C. 32676
D. 65, 535

Solution:

QUESTION: 4

Which one of the following is the correct sequence of the numbers represented in the series given below?

A. 2, 3, 4, 5, 6......
B. 2, 4, 6, 8, 10 .....
C. 2, 4, 6, 10, 12......
D. 2, 4, 6, 10, 16 .....

Solution:

QUESTION: 5

A 4 line to 16 line decoder has

A. 16 inputs and 4 outputs
B. 4 inputs and 16 outputs
C. either (a) or (b)
D. neither (a) nor (b)

Solution:

QUESTION: 6

Derive the Boolean expression for the logic circuit shown below:

Solution:

QUESTION: 7

In floating point representation the number of bits in exponent is

A. 8
B. 7
C. 6
D. 5

Solution:

QUESTION: 8

Consider the following statements:

In the 2's complement representation, negative numbers are stored in sign magnitude form.
Taking 2's complement is equivalent to sign change.
In a 4 bit complement representation of a binary number A.
In the 2's complement representation the most significant bit (MSB) is zero for a positive number.

Of these, the only true statements are

A. (I) and (III)
B. (I) and (IV)
C. (II) and (III)
D. (II) and (IV)

Solution:

QUESTION: 9

In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt request?

A. TRAP
B. INTR
C. RST 7.5
D. RST 5.5

Solution:

QUESTION: 10

Without any addition circuitry, an 8:1 MUX can be used to obtain.

A.
some but not all Boolean functions of 3 variables
B.
all functions of 3 variables and some but not all of 4 variables
C.
all functions of 3 variables but none of 4 variables
D.
all functions of 4 variables

Solution:

QUESTION: 11

The internal structure of PL A is similar to

A. RAM
B. ROM
C. both RAM and ROM
D. neither RAM nor ROM

Solution:

QUESTION: 12

Start and stop bit do not contain any information but are used in serial communication for

A. error correction
B. error detection
C. synchronization
D. slowing down the communication

Solution:

QUESTION: 13

Which of the following parameters is not specified for digital ICs?

A. Gate dissipation
B. Propagation delay
C. Noise margin
D. Bandwidth

Solution:

QUESTION: 14

A binary adder has

A. one half adder
B. one half adder and 2 full adders
C. two half adders
D. one half adder and many full adders

Solution:

QUESTION: 15

Program counter in a digital computer

A. counts the number of programs run in the machine
B. counts the number of times a subroutine
C. counts the number of time the loops are executed
D. points the memory address of the current or the next instruction

Solution:

QUESTION: 16

Which are the pending interrupts?

A. 5.5
B. 6.5
C. 7.5
D. None

Solution:

QUESTION: 17

The logical expression Y = A+AB is equivalent to

A.
Y = AB
B.
Y = AB
C.
Y = A + B
D.
Y = A

Solution:

QUESTION: 18

A quantization error is an essential aspect of ADC

A. True
B. False

Solution:

QUESTION: 19

Fundamental mode is another name for

A. level operation
B. pulse operation
C. clock operation
D. none of these

Solution:

QUESTION: 20

Schmitt trigger is used for wave shaping.

A. True
B. False

Solution:

QUESTION: 21

Assertion (A): Decoder is not a combinational circuit.

Reason (R): Every memory element of semi conductor form has a decoder.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true

Solution:

QUESTION: 22

A(A + B) =

A.
A
B.
A B
C.
AB
D.
AB

Solution:

QUESTION: 23

In 8085 microprocessor, in order to enable RST 5.5, RST 6.5 and RST 7.5 interrupts, which of the following instruction are needed?

A. EI only
B. SIM only
C. EI and SIM both
D. None

Solution:

QUESTION: 24

A retriggerable one shot is one which

A. can be triggered only once
B. has two quasi stable states
C. can not be retriggered till the complete pulse appears at output
D. can be retriggered while the output is being generated

Solution:

QUESTION: 25

For the K map in the given figure, the simplified expression is

Solution:

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Test: Digital Electronics - 6

25 Questions MCQ Test Digital Electronics | Test: Digital Electronics - 6

High speed counter

Registers and counters are similar in the sense that they both

2's complement representation of a 16 bit number (one sign bit and 15 magnitude bit) is FFFF. Its magnitude in decimal representation is

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