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# Diode Circuits & Power Supply MCQs

1. What is the primary function of a diode in a circuit?

a) To amplify signals
b) To regulate voltage
c) To control current flow
d) To store energy

Answer: c) To control current flow
Explanation: A diode is primarily used to control the direction of current flow in a circuit, allowing current to flow in one direction while blocking it in the opposite direction.

2. What is the main difference between an ideal diode and a practical diode?

a) Ideal diodes have infinite resistance in the reverse direction, while practical diodes have finite resistance.
b) Ideal diodes only allow current flow in one direction, while practical diodes allow current flow in both directions.
c) Ideal diodes have no voltage drop when conducting, while practical diodes have a small voltage drop.
d) There is no difference between an ideal diode and a practical diode.

Answer: c) Ideal diodes have no voltage drop when conducting, while practical diodes have a small voltage drop.
Explanation: Ideal diodes are theoretical components with no voltage drop when conducting, while practical diodes have a small forward voltage drop typically around 0.7 volts.

3. In a clipper circuit, what is the main purpose of using diodes?

a) To amplify the input signal
b) To generate a square wave output
c) To limit the amplitude of the input signal
d) To filter out noise from the input signal

Answer: c) To limit the amplitude of the input signal
Explanation: Clipper circuits use diodes to limit or clip the amplitude of the input signal by conducting when the signal exceeds a certain threshold.

4. What is the function of a clamper circuit in electronics?

a) To stabilize the DC voltage level
b) To amplify the input signal
c) To generate a sine wave output
d) To shift the DC level of a waveform

Answer: d) To shift the DC level of a waveform
Explanation: A clamper circuit is used to shift the DC level of a waveform without distorting its shape. It adds or subtracts a DC level to the input waveform.

5. Which type of rectifier circuit produces a pulsating DC output?

a) Half-wave rectifier
b) Full-wave rectifier
c) Bridge rectifier
d) Voltage regulator

Explanation: A half-wave rectifier only conducts during one half-cycle of the input AC waveform, producing a pulsating DC output.

6. What is the advantage of a full-wave rectifier over a half-wave rectifier?

a) Higher efficiency
b) Lower cost
c) Simplicity in design
d) Smaller size

Explanation: A full-wave rectifier utilizes both halves of the AC input waveform, resulting in a higher efficiency compared to a half-wave rectifier.

7. Which rectifier circuit configuration is commonly used in high-current applications?

a) Half-wave rectifier
b) Full-wave rectifier
c) Bridge rectifier
d) Voltage doubler

Explanation: Bridge rectifiers are commonly used in high-current applications due to their ability to handle larger currents and their compact design.

8. What is the purpose of a filter circuit in a power supply?

a) To convert AC to DC
b) To regulate the output voltage
c) To smooth out the pulsating DC
d) To amplify the output voltage

Answer: c) To smooth out the pulsating DC
Explanation: Filter circuits in power supplies are used to remove or reduce the ripple component from the rectified DC output, resulting in a smoother DC voltage.

9. Which type of voltage regulator circuit provides a constant output voltage by shunting excess current to ground?

a) Shunt regulator
b) Series regulator
c) Zener regulator
d) Darlington regulator