Q. In a full adder, how many inputs does it have?
Solution
A full adder has three inputs: two significant bits and one carry-in bit.
Correct Answer:
C
— 3
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Q. In a multiplexer, what is the role of the select lines?
-
A.
To determine the output based on input values
-
B.
To store data
-
C.
To provide power
-
D.
To control timing
Solution
Select lines in a multiplexer determine which input line is connected to the output.
Correct Answer:
A
— To determine the output based on input values
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Q. What is the output of a 2-input AND gate when both inputs are high?
-
A.
0
-
B.
1
-
C.
Undefined
-
D.
Both 0 and 1
Solution
An AND gate outputs high (1) only when both inputs are high (1).
Correct Answer:
B
— 1
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Q. What is the output of a 2-input OR gate when one input is low and the other is high?
-
A.
0
-
B.
1
-
C.
Both 0 and 1
-
D.
Undefined
Solution
An OR gate outputs high (1) if at least one input is high (1).
Correct Answer:
B
— 1
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Q. What is the output of a 3-input XOR gate when all inputs are high?
-
A.
0
-
B.
1
-
C.
Undefined
-
D.
Both 0 and 1
Solution
A 3-input XOR gate outputs high (1) if an odd number of inputs are high; with all inputs high, it outputs low (0).
Correct Answer:
A
— 0
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Q. What is the primary function of a decoder in combinational logic?
-
A.
To perform arithmetic operations
-
B.
To convert binary data to decimal
-
C.
To select one output from multiple inputs
-
D.
To convert binary inputs to a unique output line
Solution
A decoder converts binary inputs into a unique output line, activating one output for each input combination.
Correct Answer:
D
— To convert binary inputs to a unique output line
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Q. What is the truth table output for a 2-input NAND gate when both inputs are high?
-
A.
0
-
B.
1
-
C.
Both 0 and 1
-
D.
Undefined
Solution
A NAND gate outputs low (0) only when both inputs are high (1); otherwise, it outputs high (1).
Correct Answer:
A
— 0
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Q. What is the truth table output for a NAND gate when both inputs are low?
-
A.
0
-
B.
1
-
C.
Both 0 and 1
-
D.
Undefined
Solution
A NAND gate outputs high (1) when at least one input is low; thus, it outputs 1 when both inputs are low.
Correct Answer:
B
— 1
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Q. Which logic gate is equivalent to an inverter followed by an AND gate?
-
A.
NAND gate
-
B.
NOR gate
-
C.
AND gate
-
D.
OR gate
Solution
An inverter followed by an AND gate is equivalent to a NAND gate.
Correct Answer:
A
— NAND gate
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Q. Which of the following is a characteristic of a combinational logic circuit?
-
A.
Output depends on past inputs
-
B.
Output depends only on current inputs
-
C.
Requires a clock signal
-
D.
Can store data
Solution
Combinational logic circuits produce outputs based solely on current inputs, without memory of past inputs.
Correct Answer:
B
— Output depends only on current inputs
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Q. Which of the following is NOT a combinational logic circuit?
-
A.
Adder
-
B.
Multiplexer
-
C.
Flip-Flop
-
D.
Decoder
Solution
A flip-flop is a sequential logic circuit, while the others are combinational.
Correct Answer:
C
— Flip-Flop
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Showing 1 to 11 of 11 (1 Pages)
