1. What is the primary function of a Varistor diode?
A. To rectify AC b) To limit the voltage to a safe level c) To amplify
weak signals d) To emit light
Answer: b) To limit the voltage to a safe level Rationale: Varistors are
used to protect circuits from voltage spikes by limiting the voltage to a
safe level when the voltage exceeds a certain threshold.
2. What happens when a diode is reverse biased beyond its breakdown
voltage?
A. It becomes open circuit b) It will start to conduct heavily, possibly
leading to damage c) It will block all current d) It will behave like a
resistor
Answer: b) It will start to conduct heavily, possibly leading to damage
Rationale: When a diode is reverse biased beyond its breakdown
voltage, it starts conducting heavily and can be permanently damaged
if the current is not limited.
3. What is the effect of a diode's series resistance on its performance?
A. It reduces the efficiency of the diode b) It has no effect on the diode's
performance c) It increases the diode's forward voltage drop d) It
causes the diode to act as a short circuit
,Answer: c) It increases the diode's forward voltage drop Rationale: The
series resistance in a diode increases the forward voltage drop and can
limit the current through the diode, especially at higher currents.
4. What is the primary role of a diode in a rectifier circuit?
A. To filter the output b) To convert AC to DC c) To amplify the signal
d) To regulate voltage
Answer: b) To convert AC to DC Rationale: In a rectifier circuit, a
diode converts alternating current (AC) to direct current (DC) by
allowing current to flow in only one direction.
5. In which of the following cases does a diode behave like an open
circuit?
A. Forward biased with high current b) Reverse biased with voltage
less than the breakdown voltage c) Forward biased with low voltage d)
Reverse biased with voltage greater than the breakdown voltage
Answer: b) Reverse biased with voltage less than the breakdown
voltage Rationale: In reverse bias, a diode behaves like an open circuit
when the reverse voltage is below the breakdown voltage, meaning no
current flows.
6. Which of the following diodes is used for low-power rectification?
A. Schottky diode b) Zener diode c) Light Emitting Diode d) Silicon
diode
, Answer: d) Silicon diode Rationale: Silicon diodes are commonly used
for low-power rectification due to their good performance in such
applications.
7. In a full-wave rectifier, how many diodes are typically used?
A. One b) Two c) Four d) Six
Answer: c) Four Rationale: A full-wave rectifier typically uses four
diodes arranged in a bridge configuration to convert the entire AC
waveform to DC.
8. What is the main application of a photodiode?
A. Signal amplification b) Voltage regulation c) Light detection d)
Power rectification
Answer: c) Light detection Rationale: Photodiodes are used for
detecting light and converting it into an electrical current, typically in
optical applications such as fiber optic communication and light
sensors.
9. What type of diode is used for high-power rectification applications?
A. Schottky diode b) Zener diode c) Power diode d) Light Emitting
Diode
Answer: c) Power diode Rationale: Power diodes are designed to handle
high currents and voltages, making them ideal for high-power
rectification applications.
A. To rectify AC b) To limit the voltage to a safe level c) To amplify
weak signals d) To emit light
Answer: b) To limit the voltage to a safe level Rationale: Varistors are
used to protect circuits from voltage spikes by limiting the voltage to a
safe level when the voltage exceeds a certain threshold.
2. What happens when a diode is reverse biased beyond its breakdown
voltage?
A. It becomes open circuit b) It will start to conduct heavily, possibly
leading to damage c) It will block all current d) It will behave like a
resistor
Answer: b) It will start to conduct heavily, possibly leading to damage
Rationale: When a diode is reverse biased beyond its breakdown
voltage, it starts conducting heavily and can be permanently damaged
if the current is not limited.
3. What is the effect of a diode's series resistance on its performance?
A. It reduces the efficiency of the diode b) It has no effect on the diode's
performance c) It increases the diode's forward voltage drop d) It
causes the diode to act as a short circuit
,Answer: c) It increases the diode's forward voltage drop Rationale: The
series resistance in a diode increases the forward voltage drop and can
limit the current through the diode, especially at higher currents.
4. What is the primary role of a diode in a rectifier circuit?
A. To filter the output b) To convert AC to DC c) To amplify the signal
d) To regulate voltage
Answer: b) To convert AC to DC Rationale: In a rectifier circuit, a
diode converts alternating current (AC) to direct current (DC) by
allowing current to flow in only one direction.
5. In which of the following cases does a diode behave like an open
circuit?
A. Forward biased with high current b) Reverse biased with voltage
less than the breakdown voltage c) Forward biased with low voltage d)
Reverse biased with voltage greater than the breakdown voltage
Answer: b) Reverse biased with voltage less than the breakdown
voltage Rationale: In reverse bias, a diode behaves like an open circuit
when the reverse voltage is below the breakdown voltage, meaning no
current flows.
6. Which of the following diodes is used for low-power rectification?
A. Schottky diode b) Zener diode c) Light Emitting Diode d) Silicon
diode
, Answer: d) Silicon diode Rationale: Silicon diodes are commonly used
for low-power rectification due to their good performance in such
applications.
7. In a full-wave rectifier, how many diodes are typically used?
A. One b) Two c) Four d) Six
Answer: c) Four Rationale: A full-wave rectifier typically uses four
diodes arranged in a bridge configuration to convert the entire AC
waveform to DC.
8. What is the main application of a photodiode?
A. Signal amplification b) Voltage regulation c) Light detection d)
Power rectification
Answer: c) Light detection Rationale: Photodiodes are used for
detecting light and converting it into an electrical current, typically in
optical applications such as fiber optic communication and light
sensors.
9. What type of diode is used for high-power rectification applications?
A. Schottky diode b) Zener diode c) Power diode d) Light Emitting
Diode
Answer: c) Power diode Rationale: Power diodes are designed to handle
high currents and voltages, making them ideal for high-power
rectification applications.
