Digital Circuits Mcqs

Q:

The classic multivibrator circuit is known as ____________

A) Metal-coupled multivibrator B) Plate-coupled multivibrator
C) Parallel-plate coupled multivibrator D) Alternate-plate coupled multivibrator
 
Answer & Explanation Answer: B) Plate-coupled multivibrator

Explanation: The classic multivibrator circuit (also called a plate-coupled multivibrator) is first described by Henri Abraham and Eugene Bloch.

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Q:

Monostable multivibrator can also be termed as ____________

A) Full astable multivibrator B) Half astable multivibrator
C) Half bistable multivibrator D) Full bistable multivibrator
 
Answer & Explanation Answer: B) Half astable multivibrator

Explanation: Since, astable multivibrator is unstable and changes their states continually (It means that it can have both the states), whereas in monostable multivibrator, one of the states is stable, but the other state is unstable. SO Monostable Multivibrator is also known as Half-Astable Multivibrator.

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Q:

In an astable multivibrator, the amplifying elements are ____________

A) FET B) JFET
C) OP-AMP D) All of the Mentioned
 
Answer & Explanation Answer: D) All of the Mentioned

Explanation: Astable multivibrators are made with FET, JFET, OP-AMP or other types of amplifier. Astable circuit continually switches from one state to the other. It keeps oscillating between unstable states.

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18
Q:

Astable circuit acts as a/an ____________

A) Amplifier B) Oscillator
C) Relaxation oscillator D) Multiplexer
 
Answer & Explanation Answer: C) Relaxation oscillator

Explanation: Astable circuit continually switches from one state to the other. It keeps oscillating between unstable states. Hence, it functions as a relaxation oscillator.

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11
Q:

Bistable circuit is also known as ____________

A) Latch B) Gate
C) Flip-flop D) Bidirectional circuit
 
Answer & Explanation Answer: C) Flip-flop

Explanation: Bistable multivibrator circuit has the capability to store 1-bit of information. So, it is also known as flip-flop. Like Flip-flop, Bistable circuit also has 2 states.

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9
Q:

Bistable multivibrator is ________ in any state.

A) Stable B) Unstable
C) Saturated D) Independent
 
Answer & Explanation Answer: A) Stable

Explanation: Bistable multivibrator is a type of multivibrator having two stable states. The circuit is stable in either state. It can be flipped from one state to the other by an external trigger pulse.

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11
Q:

Monostable multivibrator is/has ________ state.

A) Stable B) Unstable
C) One stable and another unstable D) Independent
 
Answer & Explanation Answer: B) Unstable

Explanation: Monostable multivibrator, in which one of the states is stable, but the other state is unstable (transient). A trigger pulse causes the circuit to enter the unstable state. After entering the unstable state, the circuit will return to the stable state after a set time.

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10
Q:

Astable multivibrator is ________ in any state.

A) Stable B) Unstable
C) Saturated D) Both Stable & Saturated
 
Answer & Explanation Answer: B) Unstable

Explanation: Astable multivibrator, in which the circuit is not stable in either state i.e. it continually switches from one state to the other. It is internally triggered and does not have any stable state.

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