Digital Computer Electronics MCQ Questions & Answers

31

How many inputs signals can a gate have?

A) one B) more than one C) two only D) both (a) and (b) E) None of the above

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Answer & Solution

Answer: Option D

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32

A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known as

A) encoder B) decoder C) multiplexer D) demultiplexer E) None of the above

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Answer & Solution

Answer: Option C

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33

Conversion of binary number 1001001₂ to hexadecimal is

A) 40₁₆ B) 39₁₆ C) 49₁₆ D) 42₁₆ E) None of the above

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Answer & Solution

Answer: Option C

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34

Which logic family dissipates the minimum power?

A) DTL B) TTL C) ECL D) CMOS E) None of the above

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Answer & Solution

Answer: Option D

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35

What logic function is obtained by adding an inverter to the inputs of an AND gate?

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

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Answer & Solution

Answer: Option B

Solution:

When you add an inverter (NOT gate) to the inputs of an AND gate, you create a logic gate known as a NAND gate.

The NAND gate performs the logical AND operation on its inputs and then negates (inverts) the output. In other words, it gives the opposite result of an AND gate.

The truth table for a 2-input NAND gate is as follows:

A	B	Output
0	0	1
0	1	1
1	0	1
1	1	0

As you can see, the output is 1 for all input combinations except when both inputs are 1.
Therefore, the correct answer is Option B: NAND.

36

A bus is a group of _____ carrying digital signals.

A) wires B) gates C) transistors D) registers E) None of the above

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Answer & Solution

Answer: Option A

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37

The simplified form of the Boolean expression (X + Y + XY)(X + Z) is

A) X + Y + Z B) XY + YZ C) X + YZ D) XZ + Y E) None of the above

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Answer & Solution

Answer: Option C

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38

De Morgan's first theorem says that a NOR gate is equivalent to a bubbled _____ gate.

A) AND B) XAND C) XOR D) NOR E) None of the above

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Answer & Solution

Answer: Option A

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39

Addition of 10₂ and 11₂ is

A) 100₂ B) 101₂ C) 111₂ D) 110₂ E) None of the above

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Answer & Solution

Answer: Option B

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40

How many bits are required to encode all twenty six letters ten symbols, and ten numerals?

A) 5 B) 6 C) 2 D) 3 E) None of the above

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Answer & Solution

Answer: Option B

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Digital Computer Electronics MCQ Questions & Answers | Computer Science