Q. In digital circuits, what does the term 'logic level' refer to?
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A.
Voltage levels
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B.
Frequency levels
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C.
Temperature levels
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D.
Current levels
Solution
Logic level refers to the voltage levels that represent binary values (0 and 1) in digital circuits.
Correct Answer:
A
— Voltage levels
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Q. What does the term 'propagation delay' refer to in digital circuits?
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A.
Time taken for a signal to travel
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B.
Time taken for a circuit to reset
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C.
Time taken for a signal to stabilize
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D.
Time taken for power to reach the circuit
Solution
Propagation delay is the time taken for a signal to travel through a circuit from input to output.
Correct Answer:
A
— Time taken for a signal to travel
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Q. What is the function of a NOT gate?
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A.
Inverts the input
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B.
Outputs the same input
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C.
Combines inputs
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D.
None of the above
Solution
A NOT gate inverts its input; if the input is 1, the output is 0, and vice versa.
Correct Answer:
A
— Inverts the input
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Q. What is the main purpose of a decoder in digital circuits?
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A.
To convert binary data to decimal
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B.
To select specific outputs based on input combinations
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C.
To perform arithmetic operations
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D.
To store data
Solution
A decoder converts binary input into a unique output line, selecting specific outputs based on input combinations.
Correct Answer:
B
— To select specific outputs based on input combinations
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Q. What is the output of a NAND gate when both inputs are low?
-
A.
0
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B.
1
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C.
Undefined
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D.
Depends on the circuit
Solution
A NAND gate outputs 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. What is the output of an AND gate when both inputs are high?
-
A.
0
-
B.
1
-
C.
Undefined
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D.
Depends on the circuit
Solution
An AND gate outputs 1 only when both inputs are high (1).
Correct Answer:
B
— 1
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Q. What is the primary function of a multiplexer?
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A.
To perform arithmetic operations
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B.
To select one of many inputs
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C.
To store data
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D.
To amplify signals
Solution
A multiplexer selects one of many input signals and forwards the selected input to a single output line.
Correct Answer:
B
— To select one of many inputs
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Q. What is the primary function of an XOR gate?
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A.
Outputs true if inputs are the same
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B.
Outputs true if inputs are different
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C.
Inverts the input
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D.
Combines inputs
Solution
An XOR gate outputs true (1) if the inputs are different.
Correct Answer:
B
— Outputs true if inputs are different
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Q. What is the result of the expression A + A' in Boolean algebra?
Solution
In Boolean algebra, A + A' equals 1, as one of the inputs will always be true.
Correct Answer:
B
— 1
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Q. Which logic circuit can be used to implement a full adder?
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A.
AND, OR, NOT
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B.
NAND only
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C.
XOR only
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D.
OR only
Solution
A full adder can be implemented using AND, OR, and NOT gates.
Correct Answer:
A
— AND, OR, NOT
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Q. Which of the following circuits can be used to implement a binary counter?
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A.
Decoder
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B.
Multiplexer
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C.
Flip-flop
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D.
Shift register
Solution
Flip-flops are commonly used to implement binary counters, as they can store and toggle states.
Correct Answer:
C
— Flip-flop
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Q. Which of the following is a characteristic of a flip-flop?
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A.
It can store multiple bits
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B.
It is a combinational circuit
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C.
It has memory
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D.
It requires continuous power
Solution
A flip-flop is a bistable device that can store one bit of data, thus it has memory.
Correct Answer:
C
— It has memory
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Showing 1 to 12 of 12 (1 Pages)
