Electronics and Communication Engineering - Digital Electronics

46. 

Which of these are universal gates?

A. Only NOR
B. Only NAND
C. Both NOR and NAND
D. NOR, NAND, OR

Answer: Option C

Explanation:

Both NAND and NOR are called universal gates.


47. 

Out of latch and flip flop, which has clock input?

A. Latch only
B. Flip flop only
C. Both latch and flip flop
D. None

Answer: Option B

Explanation:

This the main difference between latch and flip-flop. Only flip-flop has clock input.


48. 

A mod 4 counter will count

A. from 0 to 4
B. from 0 to 3
C. from any number n to n + 4
D. none of the above

Answer: Option B

Explanation:

Mod 4 counter has 4 states, 0 to 3.


49. 

In the given figure shows a 4 bit serial in parallel out right shift register. The initial contents as shown are 0110. After 3 clock pulses the contents will be

A. 0000
B. 0101
C. 1010
D. 1111

Answer: Option C

Explanation:

Output of XOR gate is input to register.


50. 

Which of the following finds application in pocket calculators?

A. TTL
B. CMOS
C. ECL
D. Both (a) and (c)

Answer: Option B

Explanation:

Because of low power consumption CMOS is used in pocket calculators.


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