Exercise: Digital Electronics

Questions for: Digital Electronics

Octal number 12 is equal to decimal number
A:
8
B:
9
C:
10
D:
11
Answer: C

12 in octal = 8 + 2, i.e., 10 in decimal.

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Which of the following finds application in pocket calculators?
A:
TTL
B:
CMOS
C:
ECL
D:
Both (a) and (c)
Answer: B

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

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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: C

Output of XOR gate is input to register.

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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: B

Mod 4 counter has 4 states, 0 to 3.

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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: B

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

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