Digital Computer Electronics MCQ Questions & Answers

11

A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that

A) it operates much faster B) it is considerably larger C) it is controlled by voltage rather than by current, so that it requires very little current at the control terminal D) it is controlled by current rather than by voltage like a bipolar transistor. E) None of the above

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Answer & Solution

Answer: Option C

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12

De Morgan's second therm says that NAND gate is equivalent to a bubbled _____ gate.

A) AND B) XAND C) XOR D) OR E) None of the above

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Answer & Solution

Answer: Option D

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13

What logic function is produced by adding an inverter to each input and the output of an AND gate?

A) NAND B) NOR C) OR D) XOR E) None of the above

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Answer & Solution

Answer: Option C

Solution:

Let inputs be A and B.

Inverting each input gives A′ and B′ to the AND gate.

The AND gate outputs A′ · B′.

Now, the output inverter changes A′ · B′ into (A′ · B′)′.

By De Morgan’s law: (A′ · B′)′ = A + B.

A + B is the OR function, not NOR.

The NOR function would be (A + B)′, which is not what we have here.

Therefore: Adding inverters to each input and the output of an AND gate produces an OR gate.

14

When a transistor is cut off or saturated, transistor _____ have almost no effect

A) wave B) variations C) stage D) circuits E) None of the above

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Answer & Solution

Answer: Option B

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15

Express -7 as 16-bit signed binary numbers.

A) 0000 0000 0000 0111 B) 1000 0000 0000 0111 C) 0111 0000 0000 0001 D) 0111 0000 0000 0000 E) None of the above

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Answer & Solution

Answer: Option B

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16

With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low.

A) No change, set B) Race, high C) high, reset D) set, reset E) None of the above

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Answer & Solution

Answer: Option C

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17

Flip-flop outputs are always

A) complimentary B) the same C) independent of each other D) same as inputs E) None of the above

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Answer & Solution

Answer: Option A

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18

The output 0 and 1 levels for TTL logic family is approximately

A) 0.1 and 5 V B) 0.6 and 3.5 V C) 0.9 and 1.75V D) -1.75 and -0.9 V E) None of the above

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Answer & Solution

Answer: Option B

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19

A _____ TTL device can sink up to 16mA and can source up to 400 MA.

A) Low-power B) high-power C) Standard D) Schottky E) None of the above

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Answer & Solution

Answer: Option C

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20

What is the 2's complement of 0011 0101 1001 1100 number?

A) 1100 1010 1100 1011 B) 1100 1010 0110 0011 C) 1100 1010 0110 0100 D) 1100 1010 1111 1111 E) None of the above

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Answer & Solution

Answer: Option C

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Digital Computer Electronics MCQ Questions & Answers | Computer Science