Digital based interview questions

1. Expansion of GAL is __________.

A.   Gate Array Logic
B.   Generic Array Logic
C.   Gate Arithmetic Logic
D.   Generic Arithmatic Logic
 


2. In decimal number system, MSD refers to__________.

A. The middle digit of a stream of numbers
B. The digit to the right of the decimal point
C. The last digit on the right
D. The digit with the most weight


 
3. Which format requires fewer conductors?

A. Parallel
B. Serial
C. Both are the same
D. Cannot tell


4. A pulse has a period of 18 ms. its frequency is_________.

A. 0.055 HZ
B. 5.55 HZ
C. 55.55HZ 
D. 18 HZ


5. An encoder converts ________.

A. HIGHs to LOWs
B. coded information into noncoded form
C. LOWs to HIGHs
D. noncoded information into coded form

6. Which type of digital circuit technology uses bipolar junction transistors?

A. CMOS   B. NMOS
C. LSI         D. TTL


7. Classification of ICs with complexities of 12 to 100 equivalent gates on a chip is?

A. MSI         B. LSI
C. VLSI       D. SSI


8. A common instrument used in troubleshooting a digital circuit is a(n) ________.

A. logic probe
B. oscilloscope
C. pulser
D. all of the above


9. convert the fractional decimaL number 6.625 to binary________.

A.  0110.1011
B.  1010.1011
C.  0110.1010
D.  0110.0011

10. convert the binary number 11010.11 to decimal_________.

A. 26.45
B. 26.75
C. 26.50
D. 27.50      



11. convert the octal number 127.4 to decimal__________.


A. 87.5
B. 98.5
C. 100
D. 82.5



12. Convert the decimal number (153.513) to octal



A. 222.554663
B. 225.988768
C. 231.406517 
D. 243.760899



13. Convert the decimal number (185) to BCD


A. OOO1 0111 0010
B. 0001 1000 0101
C. 0000 1001 1010
D. 0001 1000 0001



14. Convert the BCD number (0010 0100 0111) to binary


A. 11110111
B. 11100001
C. 11110000
D. 11110011



15. A flip-flop has ________.

A. one stable state
B. no stable states
C. two stable states
D. none of the above

16. Which of the following is best for the operation of a negative-edge-triggered D flip-flop

A. The Q output is ALWAYS identical to the D input.

B. The Q output is ALWAYS identical to the CLK input if the D input is HIGH.

C. The Q output is ALWAYS identical to the D input when CLK = PGT.

D. The logic level at the D input is transferred to Q on NGT of CLK.

17. when toggle occurs in a JK flip flop?

A. J = 0, K = 1

B. J = 1, K = 1

C. J = 0, K = 0

D. J = 1, K = 0

18. when is the master enabled, On a master-slave flip-flop?

A. when the gate is LOW

B. when the gate is HIGH

C. both of the above

D. neither of the above

19.  when no change condition occurs in a JK flip flop?

A. J = 1, K = 0

B. J = 1, K = 1

C. J = 0, K = 0

D. J = 0, K = 1

20. What is the hold condition of a flip-flop?

A. no active S or R input

B. both S and R inputs activated

C. only R is active

D. only S is active

Ans:

1.B, 2.D, 3.B, 4.C, 5.D, 6.D, 7.A, 8.D, 9.C, 10.B, 11.A, 12.C, 13.B, 14.A, 15.C, 16.D, 17.B, 18.B,19.C, 20.A