DIGITAL ELECTRONICS MCQS SET 11

DIGITAL ELECTRONICS MCQS SET 11

1․ In the toggle mode a JK flip-flop has
a. J = 0, K = 0.      b. J = 1, K = 1.     c. J = 0, K = 1.     d. J = 1, K = 0.
Explain:
J = 0, K = 0; no change condition between pre-state and next state. J = 0, K = 1; it is always reset condition means next state is always 0. J = 1, K = 0; it is always set condition means next state is always 1. J = 1, K = 1; it is toggle condition means when pre-state is 1 then next state is 0 or when pre-state is 0 then next state is 1.
 

2․ A three-state buffer has the following output states
a. 1, 0, float               b. High, Low, Float
c. Both A and B           d. Set, Reset, Halt
Explain:
A three-state buffer when enabled output is HIGH and is LOW when disabled. And neither of these condition, then it will be in FLOAT state.
 

3․ Which of the following is a digital device
a. Regulator of a fan                             b. Microphone
c. Resistance of a material                   d. Light switch
Explain:
A light switch has two condition. ON and OFF, which is similar to that of digital conditions 1 and 0 which is the basic of Boolean algebra. Rest have Fuzzy logic.
 

4․ A Binary number system has how many digits.
a. 0         b. 1            c. 2            d. 10
Explain:
A binary number system consists of only ONE and ZERO or can be stated as High and Low means it has only two digits.

5․ If a Hexadecimal number needs to convert to binary. For each hexadecimal digit, there will be how many bits
a. 1          b. 2          c. 4             d. 8
Explain:
Hexadecimal number system is a base-16 number system ( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F ). As F can be represented using 4 bits (1 1 1 1), So for each hexadecimal digit one need 4 bits.
 

6․ Temperature variation is a/an
a. Digital quantity                                        b. Analog quantity
c. Either Digital or Analog quantity          d. None
Explain:
Temperature variation is not a discrete quantity respect to time. It is continuous w.r.t time. So its an analog quantity.
 

7․ In Digital Logic Designs, GAL is abbreviated as
a. General Advance Logic         b. General Array Logic
c. Generic Advance Logic        d. Generic Array Logic
Explain:
GAL is Generic Array Logic. It is a re programmable device used in Digital Systems.
 

8․ In decimal number system what is MSD
a. First digit from left to right         b. First digit from right to left
c. Middle digit                                   d. Mean of all digits
Explain:
MSD means Most Significant Digit. It is represented by the first digit from left to right, it has the highest weight-age out of all. It can also represent the signed or unsigned number.
 

9․ A digital circuit that can store on bit is a
a. XOR gate      b. flip-flop       c. gate      d. registor
Explain:
A flip-flip is the basic unit for storing digital data and it can store only one bit.
 

10․ Stack is also known as
a. FIFO memory        b. Flash memory    c. LIFO memory
b. LILO memory
Explain:
Stack is a type of memory based on Last In First Out. A data stored last will be read first.