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Digital Electronics

Answer: A

In a synchronous counter clock pulses are applied to all flip-flops simultaneously. Hence minimum time delay and high frequency.

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2.

A + A . B =

Answer: C

A.B= 1 or 0, A + A.B = 0 if A is zero and A + A.B = 1 if A = 1. Hence A + A.B = A.

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3.

A three state switch has three outputs. These are

Answer: D

Third state is floating.

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4.

When microprocessor processes both positive and negative numbers, the representation used is

Answer: B

2's complement representation requires simple electronic circuitry.

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5.

An OR gate has 4 inputs. One input is high and the other three are low. The output

Answer: B

In OR any input high means high output.

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6.

Out of S, R, J, K, Preset, Clear inputs to flip flops, the synchronous inputs are

Answer: A

Preset and clear inputs are not applied in any fixed sequence.

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Answer: B

One shot means one stable state.

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Answer: A

In ripple counter the clock pulses are applied to one flip- flop only.

Hence as the number of flip-flops increases the delay increases.

In synchronous counter clock pulses to all flip-flops are applied simultaneously.

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9.

A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is

Answer: C

No Explanation.

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10.

If number of information bits is 4, the parity bits in Hamming code are located at bit positions __________ from the LSB.

Answer: B

The number of parity bits is 3. These bits are located at 20, 21, 22, i.e., 1, 2, 4th bits starting from LSB.

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