1. A diode is used in a circuit with a reverse bias voltage of 12V. If the
diode is a Zener diode with a breakdown voltage of 6V, what will
happen?
A. The diode will be damaged b) The diode will conduct in reverse bias
and maintain a voltage of 6V c) The diode will block current flow d)
The diode will conduct with a forward voltage drop of 0.7V
Answer: b) The diode will conduct in reverse bias and maintain a
voltage of 6V Rationale: A Zener diode in reverse bias will conduct and
maintain a constant voltage equal to its breakdown voltage (6V), even if
the reverse voltage exceeds that value.
2. What is the main feature of a P-N junction in a diode?
A. It allows current to flow equally in both directions b) It only allows
current to flow in one direction c) It blocks all current d) It amplifies
signals
Answer: b) It only allows current to flow in one direction Rationale:
The P-N junction in a diode allows current to flow from the
P-type to the N-type material but blocks current in the opposite
direction.
3. A diode is forward biased. Which of the following statements is true?
A. The P-side is connected to the positive terminal of the power supply
b) The N-side is connected to the positive terminal of the power supply
,c) No current will flow through the diode d) The diode is in reverse
bias
Answer: a) The P-side is connected to the positive terminal of the
power supply Rationale: In forward bias, the positive terminal of the
power supply is connected to the P-side (anode) and the negative
terminal to the N-side (cathode), allowing current to flow.
4. 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.
5. What is the characteristic of a diode’s I-V (current-voltage) curve in
forward bias?
A. A steep rise in current after a small threshold voltage b) A constant
current regardless of voltage c) A linear increase in current with
voltage d) No current flow regardless of voltage
Answer: a) A steep rise in current after a small threshold voltage
Rationale: In forward bias, once the threshold voltage (approximately
0.7V for silicon diodes) is exceeded, the current increases sharply with a
small increase in voltage.
, 6. What is the primary function of a rectifier diode?
A. To amplify signals b) To convert AC to DC c) To emit light d) To
regulate voltage
Answer: b) To convert AC to DC Rationale: Rectifier diodes are used in
power supplies to convert alternating current (AC) into direct current
(DC) by allowing current to flow in one direction only.
7. 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.
8. 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.
9. What is a typical application for a tunnel diode?
diode is a Zener diode with a breakdown voltage of 6V, what will
happen?
A. The diode will be damaged b) The diode will conduct in reverse bias
and maintain a voltage of 6V c) The diode will block current flow d)
The diode will conduct with a forward voltage drop of 0.7V
Answer: b) The diode will conduct in reverse bias and maintain a
voltage of 6V Rationale: A Zener diode in reverse bias will conduct and
maintain a constant voltage equal to its breakdown voltage (6V), even if
the reverse voltage exceeds that value.
2. What is the main feature of a P-N junction in a diode?
A. It allows current to flow equally in both directions b) It only allows
current to flow in one direction c) It blocks all current d) It amplifies
signals
Answer: b) It only allows current to flow in one direction Rationale:
The P-N junction in a diode allows current to flow from the
P-type to the N-type material but blocks current in the opposite
direction.
3. A diode is forward biased. Which of the following statements is true?
A. The P-side is connected to the positive terminal of the power supply
b) The N-side is connected to the positive terminal of the power supply
,c) No current will flow through the diode d) The diode is in reverse
bias
Answer: a) The P-side is connected to the positive terminal of the
power supply Rationale: In forward bias, the positive terminal of the
power supply is connected to the P-side (anode) and the negative
terminal to the N-side (cathode), allowing current to flow.
4. 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.
5. What is the characteristic of a diode’s I-V (current-voltage) curve in
forward bias?
A. A steep rise in current after a small threshold voltage b) A constant
current regardless of voltage c) A linear increase in current with
voltage d) No current flow regardless of voltage
Answer: a) A steep rise in current after a small threshold voltage
Rationale: In forward bias, once the threshold voltage (approximately
0.7V for silicon diodes) is exceeded, the current increases sharply with a
small increase in voltage.
, 6. What is the primary function of a rectifier diode?
A. To amplify signals b) To convert AC to DC c) To emit light d) To
regulate voltage
Answer: b) To convert AC to DC Rationale: Rectifier diodes are used in
power supplies to convert alternating current (AC) into direct current
(DC) by allowing current to flow in one direction only.
7. 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.
8. 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.
9. What is a typical application for a tunnel diode?
