UGC NET Computer Science Digital Circuit Design Previous Year Questions (PYQs)
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Showing 3 questions
Which of the followings are sequential circuit?
A. Flip flop
B. Multiplexer
C. Counter
D. Decoder
E. Adder
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Solution
Sequential circuits depend on previous state (memory).
• Flip-flop → sequential circuit
• Counter → sequential circuit
Multiplexer, Decoder and Adder are combinational circuits.
Match List – I with List – II.
| List – I (Counter) | List – II (uses/working) |
| (A) N-bit Ring Counter | (I) Uses universal clock |
| (B) Synchronous Counter | (II) Counts exactly N states |
| (C) Asynchronous Counter | (III) Counts 0 to 9 |
| (D) Decimal Counter | (IV) Main clock is applied to first flip-flop only |
Choose the correct answer from the options given below :
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Solution
(A) N-bit Ring Counter → Counts exactly N states → (II)
(B) Synchronous Counter → Uses common (universal) clock → (I)
(C) Asynchronous Counter → Main clock applied only to first flip-flop → (IV)
(D) Decimal Counter → Counts from 0 to 9 → (III)
Correct matching:
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
he characteristics of the combinational circuits are:
A. Output at any time is function of inputs at that time
B. Contains memory elements
C. Do not have feedback paths
D. Clock is used to trigger the circuits to obtain outputs
Choose the correct answer from the options given below:
A. Output at any time is function of inputs at that time
B. Contains memory elements
C. Do not have feedback paths
D. Clock is used to trigger the circuits to obtain outputs
Choose the correct answer from the options given below:
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4
Solution
In a combinational circuit, output depends only on present inputs.
So, statement A is true.
Combinational circuits do not contain memory elements.
So, statement B is false.
They normally do not have feedback paths.
So, statement C is true.
Clock triggering is used in sequential circuits, not combinational circuits.
So, statement D is false.
Therefore, A and C only are correct.
So, statement A is true.
Combinational circuits do not contain memory elements.
So, statement B is false.
They normally do not have feedback paths.
So, statement C is true.
Clock triggering is used in sequential circuits, not combinational circuits.
So, statement D is false.
Therefore, A and C only are correct.
UGC NET Computer Science
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UGC NET Computer Science
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and More.
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