IndiaBIX

Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 2
46.
Which of these are universal gates?
Only NOR
Only NAND
Both NOR and NAND
NOR, NAND, OR
Answer: Option
Explanation:

Both NAND and NOR are called universal gates.

47.
Out of latch and flip flop, which has clock input?
Latch only
Flip flop only
Both latch and flip flop
None
Answer: Option
Explanation:

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

48.
A mod 4 counter will count
from 0 to 4
from 0 to 3
from any number n to n + 4
none of the above
Answer: Option
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
0000
0101
1010
1111
Answer: Option
Explanation:

Output of XOR gate is input to register.

50.
Which of the following finds application in pocket calculators?
TTL
CMOS
ECL
Both (a) and (c)
Answer: Option
Explanation:

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

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