DIGITAL ELECTRONICS-II MCQ SET-3

1. Clipper circuit consist of :

(A) Resistors only
(B) Resistor and Capacitor
(C) Resistor and diode
(D) None of these

2. Which of the following circuit uses OP-AMP.

(A) Clipper
(B) Clamper
(C) Integrator
(D) All of the above

3. Which of the following is used to introduce a dc level into ac signal

(A) Clamper
(B) Clipper
(C) Integrator
(D) Differentiator

4. Which of the following is combinational circuit.

(A) Decoder
(B) Multiplexer
(C) ROM
(D) Both (a) and (b)

5. Which of the following statement is correct for paper tape :

(A) It is affected by magnetic field
(B) It is immune to magnetic field
(C) It is a digital recording device
(D) None of these

6. Which of the following multivibrator requires input pulse.

(A) Monostable multivibrator
(B) Bistable multivibrator
(C) Astable multivibrator
(D) Both (a) and (b)

7. In multivibrator circuit, there is _____ between transistors.

(A) Positive feedback
(B) Negative feedback
(C) No feedback
(D) None of these

8. In IC 555 Timer, output is taken at _____

(A) Pin-3
(B) Pin-4
(C) Pin-2
(D) Pin-5

9. Shift register is used as _____

(A) Static memory
(B) Dynamic memory
(C) Either Static or dynamic memory
(D) None of these

10. Which of the following statement is correct for charge couple device.

(A) It is fabricated using MOS technology
(B) It has low cost
(C) It has high cost
(D) All of the above

11. which of the following is read and write memory:

(A) RAM
(B) ROM
(C) Both (a) and (b)
(D) PROM

12. Which of the following memory is mode of tiny ferrite cores :

(A) RAM
(B) Shift register
(C) Magnetic core memory
(D) None of these

13. In _____ memory, data needs to be refreshed periodically.

(A) Static
(B) Dynamic
(C) Static or Dynamic
(D) None of these

14. Which of the following is D/A converter :

(A) R-2R ladder
(B) Weighted resistor
(C) Both (a) and (b)
(D) None of these

15. Which of the following relation is correct for sampling theorem, (f_s=sampling frequency, f=frequency of analog signal)

(A) f_s>=2f
(B) f_s<2f
(C) f_s< f
(D) None of these

16. In which of the following N-bit A/D conveter, number of clock pulse required is 2^N.

(A) Counting type
(B) Parallel comparator type
(C) Both (a) and (b)
(D) None of these

17. Which of the following works as encoder :

(A) Octal to binary converter
(B) BCD to decimal converter
(C) Seven segment display
(D) None of these

18. Which of the following is analog display

(A) LED display
(B) LCD display
(C) Seven segment display
(D) CRT monitor

19. Which of the following is correct statement for CD-ROM.

(A) Bit-1 is represented by burned area
(B) Bit-0 is represented by burned area
(C) Bit-1 is represented by unburned area
(D) None of these

20. Demultiplexer has _____

(A) One input and many output
(B) One input and one output
(C) Many input and many output
(D) None of these