1. Which of the following diodes is used for detecting light?
A. LED b) Photo diode c) Zener diode d) Schottky diode
Answer: b) Photo diode Rationale: Photodiodes are designed to detect
light and convert it into an electrical signal.
2. What is the main purpose of a diode in a surge protection circuit?
A. To amplify signals b) To allow excessive current to flow through c)
To block voltage spikes d) To store energy
Answer: c) To block voltage spikes Rationale: Diodes are used in surge
protection circuits to prevent high-voltage spikes from damaging
sensitive components by clamping the voltage to a safe level.
3. What is the primary difference between a diode and a transistor?
A. A diode has three layers, while a transistor has two layers b) A diode
is unidirectional, while a transistor can amplify signals c) A diode is
used for power regulation, while a transistor is used for rectification d)
A diode can amplify signals, while a transistor cannot
Answer: b) A diode is unidirectional, while a transistor can amplify
signals Rationale: A diode is a two-layer device primarily used for
unidirectional current flow, whereas a transistor has three layers and is
used for amplification.
,4. What effect does temperature have on the reverse saturation current
of a diode?
A. The reverse saturation current decreases with an increase in
temperature b) The reverse saturation current remains constant with
temperature changes c) The reverse saturation current increases with
an increase in temperature d) The reverse saturation current becomes
zero at higher temperatures
Answer: c) The reverse saturation current increases with an increase in
temperature Rationale: The reverse saturation current in a diode
increases with temperature due to the increased thermal generation of
charge carriers.
5. What is the primary reason for using a diode in a circuit?
A. To store energy b) To allow current to flow in both directions c) To
provide a path for current in one direction only d) To amplify signals
Answer: c) To provide a path for current in one direction only
Rationale: Diodes are used to control the direction of current flow,
allowing current to pass in one direction and blocking it in the opposite
direction.
6. 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.
7. What is the main advantage of using a diode in a power supply
circuit?
A. To generate heat b) To provide efficient power conversion c) To
block all current d) To amplify signals
Answer: b) To provide efficient power conversion Rationale: Diodes are
used in power supply circuits, especially in rectifiers, to efficiently
convert AC to DC, providing reliable power conversion.
8. What is the main characteristic of a Zener diode when it is used for
voltage regulation?
A. It only operates in forward bias b) It maintains a constant voltage in
reverse breakdown region c) It amplifies the input signal d) It only
conducts in the reverse direction
Answer: b) It maintains a constant voltage in reverse breakdown region
Rationale: Zener diodes are designed to operate in the reverse
breakdown region, where they maintain a stable voltage regardless of
changes in current.
9. In a full-wave rectifier, how many diodes are typically used?
A. One b) Two c) Four d) Six
A. LED b) Photo diode c) Zener diode d) Schottky diode
Answer: b) Photo diode Rationale: Photodiodes are designed to detect
light and convert it into an electrical signal.
2. What is the main purpose of a diode in a surge protection circuit?
A. To amplify signals b) To allow excessive current to flow through c)
To block voltage spikes d) To store energy
Answer: c) To block voltage spikes Rationale: Diodes are used in surge
protection circuits to prevent high-voltage spikes from damaging
sensitive components by clamping the voltage to a safe level.
3. What is the primary difference between a diode and a transistor?
A. A diode has three layers, while a transistor has two layers b) A diode
is unidirectional, while a transistor can amplify signals c) A diode is
used for power regulation, while a transistor is used for rectification d)
A diode can amplify signals, while a transistor cannot
Answer: b) A diode is unidirectional, while a transistor can amplify
signals Rationale: A diode is a two-layer device primarily used for
unidirectional current flow, whereas a transistor has three layers and is
used for amplification.
,4. What effect does temperature have on the reverse saturation current
of a diode?
A. The reverse saturation current decreases with an increase in
temperature b) The reverse saturation current remains constant with
temperature changes c) The reverse saturation current increases with
an increase in temperature d) The reverse saturation current becomes
zero at higher temperatures
Answer: c) The reverse saturation current increases with an increase in
temperature Rationale: The reverse saturation current in a diode
increases with temperature due to the increased thermal generation of
charge carriers.
5. What is the primary reason for using a diode in a circuit?
A. To store energy b) To allow current to flow in both directions c) To
provide a path for current in one direction only d) To amplify signals
Answer: c) To provide a path for current in one direction only
Rationale: Diodes are used to control the direction of current flow,
allowing current to pass in one direction and blocking it in the opposite
direction.
6. 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.
7. What is the main advantage of using a diode in a power supply
circuit?
A. To generate heat b) To provide efficient power conversion c) To
block all current d) To amplify signals
Answer: b) To provide efficient power conversion Rationale: Diodes are
used in power supply circuits, especially in rectifiers, to efficiently
convert AC to DC, providing reliable power conversion.
8. What is the main characteristic of a Zener diode when it is used for
voltage regulation?
A. It only operates in forward bias b) It maintains a constant voltage in
reverse breakdown region c) It amplifies the input signal d) It only
conducts in the reverse direction
Answer: b) It maintains a constant voltage in reverse breakdown region
Rationale: Zener diodes are designed to operate in the reverse
breakdown region, where they maintain a stable voltage regardless of
changes in current.
9. In a full-wave rectifier, how many diodes are typically used?
A. One b) Two c) Four d) Six
