Exercise: Digital Electronics

Questions for: Digital Electronics

What do the contents of instruction register specify?
A:
Operand for the instruction being executed
B:
Op code for the instruction being executed
C:
Op code for the instruction to be executed next
D:
Operand for the instruction to be executed next
Answer: B
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The inputs to a NAND gate are as shown in the given figure. The waveform of output is
A:
B:
C:
D:
Answer: A

NAND gate gives high output when both inputs are Low.

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A 4 bit synchronous counter uses flip flops with a delay time of 15 ns each. The time required for change of state is
A:
15 ns
B:
30 ns
C:
45 ns
D:
60 ns
Answer: A

In a synchronous counter clock input is applied to all flip flops simultaneously. Hence total delay time is 15 ns.

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Assertion (A): In totem pole output the output impedance is low.

Reason (R): TTL gate with active pull up should not be used in wired AND connection.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is true, R is false
D:
A is false, R is true
Answer: B
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Binary multiplication can be done by repeated addition.
A:
True
B:
False
C:
D:
Answer: A
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