DIGITAL ELECTRONICS-II MCQ SET-5

1. A punched card has how many rows and columns

(A) 12 rows, 10 columns
(B) 12 rows, 12 columns
(C) 10 rows, 80 columns
(D) 12 rows, 80 columns

2. Decoders are

(A) Combinational circuit
(B) Sequential circuit
(C) Both (a) and (b)
(D) None of the above

3. _____ multivibrator is a square wave oscillator.

(A) Astable
(B) Monostable
(C) Bistable
(D) None of these

4. Schmitt trigger generates square wave from _____ wave input.

(A) Cosine wave input
(B) Sine wave input
(C) Triangular wave input
(D) None of these

5. In 555 timer, pin no. 2 is given by :

(A) Discharge
(B) Trigger
(C) Threshold
(D) Reset

6. EPEOM can be ?

(A) UVPROM
(B) EEPROME
(C) Either (a) or (b)
(D) None of these

7. Which of the following is not a shift register?

(A) SISO
(B) PISO
(C) SISI
(D) SIPO

8. Which diode is used in seven segment display ?

(A) Tunnel diode
(B) Photo diode
(C) LED
(D) Zener diode

9. LED consumes _____ power than LCD.

(A) More
(B) Less
(C) Equal
(D) None of these

10. Fastest A/D converter is given by :

(A) Comparator A/D converter
(B) Counter type A/D converter
(C) Successive approximation A/D converter
(D) Dual slope A/D converter

11. Process of copying files to a CD-ROM is known as

(A) Burning
(B) Zipping
(C) Ripping
(D) None of these

12. Which of the following is incorrect ?

(A) A’ + O = A
(B) A . 1 = A
(C) A + A’ = 1
(D) None of these

13. Cache memory is made by using _____

(A) SRAM
(B) DRAM
(C) Both (a) and (b)
(D) None of these

14. Which of the following has memory ?

(A) Astable multivibrator
(B) Bistable multivibrator
(C) NANAD gate
(D) NOR gate

15. Which of the following IC is Dual 2 to 4 line decoder

(A) IC 74139
(B) IC 74155
(C) IC 74156
(D) None of these

16. Multiplexer is also known as

(A) Coder
(B) Parallel adder
(C) Data Selector
(D) None

17. LED emits light when it is _____ baised.

(A) Forward baised
(B) Reverse baised
(C) Both (a) and (b)
(D) None of these

18. Which device used nematic fluid :

(A) LED
(B) LCD
(C) VF display
(D) None

19. Memory that losses its content when power is lost is :

(A) Random
(B) Static
(C) volatile
(D) None of these

20. Which one of the following is correct :

(A) 1 KB = 1024 bits
(B) 1 MB = 1024 bytes
(C) 1 KB = 1024 bytes
(D) 1 MB = 1000 bytes