Diodes: Types, Characteristics, and Applications

Question 1

When a diode is reverse biased, which process contributes to the diode current?

Accepted Answer

Generation

Answer

Drift

Answer

Diffusion

Answer

Recombination

Question 2

What is the primary purpose of a Zener diode?

Accepted Answer

Voltage regulation

Answer

Current limitation

Answer

Signal rectification

Answer

Capacitance storage

Question 3

Which parameter is NOT used to characterize a diode?

Accepted Answer

Transistor gain

Answer

Forward voltage drop

Answer

Reverse saturation current

Answer

Capacitance

Question 4

What is the primary purpose of diodes in AC circuits?

Accepted Answer

To block current in one direction

Answer

To generate an oscillating signal

Answer

To store energy

Answer

To amplify voltage

Question 5

Which type of diode exhibits a negative resistance region in its characteristic curve?

Accepted Answer

Tunnel diode

Answer

Schottky diode

Answer

Varicap diode

Answer

PIN diode

Question 6

What is the purpose of a bias resistor in a diode circuit?

Accepted Answer

To limit forward current

Answer

To reduce junction capacitance

Answer

To increase reverse bias

Answer

To increase breakdown voltage

Question 7

Identify the option that does not represent a type of diode:

Accepted Answer

Resistor

Answer

Schottky diode

Answer

Zener diode

Question 8

What is the primary function of a diode?

Accepted Answer

To conduct electricity in one direction only

Answer

To amplify signals

Answer

To store electrical energy

Answer

To regulate voltage

Question 9

What is the forward bias voltage for a silicon PN junction diode at room temperature?

Accepted Answer

0.7 V

Answer

0.1 V

Answer

0.3 V

Answer

1.0 V

Question 10

Which diode configuration is used to regulate voltage to a specific value?

Accepted Answer

Zener breakdown bias

Answer

Forward bias

Answer

Reverse bias

Answer

Forward breakdown bias

Question 11

Which factor primarily affects the reverse breakdown voltage of a diode?

Accepted Answer

Doping concentration

Answer

Junction area

Answer

Diffusion depth

Answer

Semiconductor material

Question 12

What is the primary application of a Schottky diode?

Accepted Answer

High-speed switching

Answer

Voltage rectification

Answer

Voltage regulation

Answer

Overvoltage protection

Question 13

Which primary factors limit the switching speed of a diode?

Accepted Answer

Carrier lifetime and junction capacitance

Answer

Reverse recovery current and forward voltage drop

Answer

Thermal resistance and doping profile

Answer

Resistance of the connecting wires and external circuit

Question 14

Identify the incorrect option representing a type of diode.

Accepted Answer

Capacitor

Answer

Signal diode

Answer

Zener diode

Answer

Light-emitting diode

Question 15

What is the role of a forward bias in a diode?

Accepted Answer

Facilitates current flow in the intended direction

Answer

Blocks current flow in the opposing direction

Answer

Enhances the diode's resistance

Answer

Reduces the diode's capacitance

Question 16

Determine the ideal turn-on voltage for a silicon diode.

Accepted Answer

0.7 V

Answer

0.3 V

Answer

0.5 V

Answer

1.0 V

Question 17

Which of the following applications utilizes a Zener diode?

Accepted Answer

Voltage regulation

Answer

Rectification

Answer

Amplification

Answer

Oscillation

Question 18

What is the primary function of a rectifier diode?

Accepted Answer

Converts alternating current (AC) to direct current (DC)

Answer

Converts direct current (DC) to alternating current (AC)

Answer

Regulates voltage levels

Answer

Amplifies electrical signals

Question 19

What is the purpose of forward biasing a diode?

Accepted Answer

To allow current to flow in the forward direction

Answer

To block current flow in the reverse direction

Answer

To increase the diode's resistance

Answer

To decrease the diode's capacitance

Question 20

Which type of diode typically exhibits a low forward voltage drop?

Accepted Answer

Schottky diode

Answer

Zener diode

Answer

Varactor diode

Answer

Tunnel diode

Question 21

What is the primary function of a Zener diode?

Accepted Answer

Voltage regulation

Answer

Current amplification

Answer

AC signal rectification

Answer

Oscillation generation

Question 22

How does the diode current typically vary with the forward bias voltage?

Accepted Answer

Exponential

Answer

Linear

Answer

Inverse exponential

Answer

Logarithmic

Question 23

What is the main purpose of the depletion region in a diode?

Accepted Answer

To block reverse current flow

Answer

To allow forward current flow

Answer

To store charge carriers

Answer

To increase the diode's capacitance

Question 24

Which of the following parameters is **not** commonly used to characterize a diode?

Accepted Answer

Inductance

Answer

Forward voltage drop

Answer

Reverse breakdown voltage

Answer

Junction capacitance

Question 25

Which of the following precisely describes the primary function of a diode?

Accepted Answer

To selectively conduct electrical current in a single direction

Answer

To store electrical energy for extended periods

Answer

To regulate and stabilize voltage within a circuit

Answer

To amplify electrical signals effectively

Question 26

In a diode, which region permits current to flow with minimal resistance?

Accepted Answer

Forward bias region

Answer

Depletion region

Answer

Reverse bias region

Answer

Breakdown region

Question 27

What is the primary purpose of the breakdown voltage in a Zener diode?

Accepted Answer

To regulate voltage in a circuit by maintaining a constant voltage across the diode

Answer

To limit the reverse voltage that can be applied to the diode without causing damage

Answer

To increase the forward current flow through the diode

Answer

To reduce the capacitance of the diode

Question 28

Which of the following is NOT a characteristic of a tunnel diode?

Accepted Answer

Conduction primarily by majority carriers

Answer

Negative differential resistance region

Answer

Operation at low voltage levels

Answer

High-frequency operation

Question 29

In the context of diode biasing, when is a diode said to be forward-biased?

Accepted Answer

When the anode is more positive than the cathode

Answer

When the cathode is more positive than the anode

Answer

When the diode is connected to a DC voltage source

Answer

When the diode is connected to an AC voltage source

Question 30

Which diode biasing method enables the highest forward current flow?

Accepted Answer

Forward bias

Answer

Reverse bias

Answer

Zero bias

Question 31

In this diode circuit, when the diode is forward biased, what is the voltage across it? Assume an ideal diode with a forward voltage drop of 0.7 V.

Accepted Answer

0.7 V

Answer

0 V

Answer

5 V

Answer

-5 V

Question 32

Which of the following is a characteristic property of diodes?

Accepted Answer

The forward voltage drop across a silicon diode is typically around 0.7 volts.

Accepted Answer

The reverse breakdown voltage is the maximum voltage that can be applied across a diode without causing failure.

Answer

Diodes allow current to flow in both directions.

Question 33

Which of the following is NOT a type of diode?

Accepted Answer

Transistor

Answer

Signal diode

Answer

Light-emitting diode (LED)

Question 34

Which of the following is NOT a type of diode?

Accepted Answer

Capacitor

Answer

Schottky diode

Answer

Zener diode

Answer

Light-emitting diode (LED)

Question 35

Which of the following is NOT a type of diode?

Accepted Answer

Transformer

Answer

Schottky diode

Answer

Light-emitting diode

Answer

Zener diode

Question 36

What is the primary function of a diode in an electrical circuit?

Accepted Answer

Control the flow of current in one direction

Answer

Amplify signals

Answer

Store charge

Answer

Generate light

Question 37

Which of the following materials is commonly used in the production of silicon diodes?

Accepted Answer

Semiconductor

Answer

Superconductor

Answer

Conductor

Answer

Insulator

Question 38

In a diode, the region where current flows easily is called the:

Accepted Answer

Forward bias region

Answer

Reverse bias region

Answer

Depletion region

Answer

Breakdown region

Question 39

Which of the following is a practical application of a Zener diode?

Accepted Answer

Voltage regulation

Answer

Signal amplification

Answer

Light emission

Question 40

The ideal value of current flowing through a diode under reverse bias is:

Accepted Answer

Zero

Answer

Small and constant

Answer

Dependent on the reverse voltage

Answer

Equal to the forward current

Question 41

Which of the following is a limitation of using diodes in electronic circuits?

Accepted Answer

Power loss during rectification

Answer

Low cost

Answer

Long lifespan

Answer

High switching speed

Question 42

The main purpose of a heat sink in a diode circuit is to:

Accepted Answer

Dissipate heat generated by the diode

Answer

Increase the forward voltage drop

Answer

Store charge

Answer

Protect the diode from reverse voltage

Question 43

Which of the following materials is commonly used in the fabrication of the PN junction in a diode?

Accepted Answer

Silicon

Answer

Aluminum

Answer

Copper

Question 44

What is the primary function of a Zener diode?

Accepted Answer

Voltage regulation by maintaining a stable voltage across it despite variations in current or load.

Answer

Rectification of alternating current (AC) to direct current (DC).

Answer

Amplification of electrical signals.

Answer

Switching high currents in electronic circuits.

Question 45

Which of the following is a characteristic of an ideal diode?

Accepted Answer

Zero voltage drop in forward bias and infinite resistance in reverse bias.

Answer

High voltage drop in forward bias and low resistance in reverse bias.

Answer

Exponential voltage-current relationship in both forward and reverse bias.

Question 46

What is the purpose of specifying the reverse recovery time for a diode?

Accepted Answer

To determine the time required for the diode to switch from reverse bias to forward bias and regain its blocking capability.

Answer

To determine the maximum forward current that the diode can conduct.

Answer

To determine the maximum reverse voltage that the diode can withstand without breaking down.

Question 47

In a full-wave rectifier circuit, what is the primary function of the diodes?

Accepted Answer

To convert AC voltage to DC voltage by allowing current to flow in only one direction during both half cycles of the AC input.

Answer

To filter out high-frequency noise by acting as a low-pass filter.

Answer

To amplify the input signal by utilizing the exponential relationship between voltage and current in forward bias.

Answer

To generate a square wave output by clipping the negative or positive half cycles of the AC input.

Question 48

Which factors primarily influence the breakdown voltage of a diode?

Accepted Answer

Doping concentration of the semiconductor material and the junction temperature.

Answer

Physical size and shape of the diode.

Answer

Forward current and reverse current flowing through the diode.

Answer

Applied voltage and frequency of the AC signal.

Question 49

What is the main purpose of a varactor diode?

Accepted Answer

To vary its capacitance with applied voltage, making it useful in tunable circuits, oscillators, and frequency modulation.

Answer

To rectify AC voltage by allowing current to flow in only one direction.

Answer

To switch high currents in electronic circuits due to its low forward voltage drop.

Answer

To regulate voltage by maintaining a stable voltage across it.

Question 50

**[Clarity and Precision]** What is the fundamental function of a diode in an electronic circuit?

Accepted Answer

**[Correctness and Precision]** To allow current to flow in a single direction only.

Answer

**[Distractor Replacement]** To regulate voltage.

Answer

**[Distractor Refinement]** To amplify electrical signals.

Answer

**[Distractor Replacement]** To convert alternating current (AC) to direct current (DC).

Question 51

**[Clarity and Precision]** Which of the following is not a recognized type of diode?

Accepted Answer

**[Correctness and Precision]** Transistor

Answer

**[Distractor Refinement]** Light-emitting diode (LED)

Answer

**[Distractor Refinement]** Zener diode

Answer

**[Distractor Refinement]** Schottky diode

Question 52

**[Clarity and Precision]** What is the typical forward voltage drop observed across a silicon diode?

Accepted Answer

**[Correctness and Precision]** Approximately 0.7 volts

Answer

**[Distractor Refinement]** Approximately 1.2 volts

Answer

**[Distractor Refinement]** Close to 2.0 volts

Answer

**[Distractor Refinement]** Around 0.3 volts

Question 53

**[Clarity and Precision]** In a half-wave rectifier circuit, what is the primary role of the diode?

Accepted Answer

**[Correctness and Precision]** To facilitate current flow only during the positive half-cycle of the input signal.

Answer

**[Distractor Refinement]** To filter the output signal.

Answer

**[Distractor Refinement]** To rectify the input signal.

Question 54

**[Clarity and Precision]** What is the fundamental difference between a Zener diode and a conventional diode?

Accepted Answer

**[Correctness and Precision]** A Zener diode is designed to operate in reverse breakdown, while a conventional diode is not.

Answer

**[Distractor Refinement]** A Zener diode has a higher forward voltage drop.

Answer

**[Distractor Refinement]** A Zener diode is intended for use in alternating current (AC) circuits.

Question 55

**[Clarity and Precision]** Which of the following is not a defining characteristic of an ideal diode?

Accepted Answer

**[Correctness and Precision]** Non-zero forward voltage drop

Answer

**[Distractor Refinement]** Infinite reverse resistance

Answer

**[Distractor Refinement]** Zero forward resistance

Answer

**[Distractor Refinement]** Instantaneous switching between ON and OFF states

Question 56

**[Clarity and Precision]** In a diode clipper circuit, what is the primary function of the diode?

Accepted Answer

**[Correctness and Precision]** To limit the amplitude of the input signal.

Answer

**[Distractor Refinement]** To filter the output signal.

Answer

**[Distractor Refinement]** To amplify the input signal.

Question 57

**[Clarity and Precision]** Which diode is commonly utilized in applications involving light emission?

Accepted Answer

**[Correctness and Precision]** Light-emitting diode (LED)

Answer

**[Distractor Refinement]** Zener diode

Answer

**[Distractor Refinement]** Schottky diode

Answer

**[Distractor Refinement]** PIN diode

Question 58

**[Clarity and Precision]** What is the primary purpose of a diode in a voltage regulator circuit?

Accepted Answer

**[Correctness and Precision]** To maintain a consistent output voltage.

Answer

**[Distractor Refinement]** Prevent reverse current flow

Answer

**[Distractor Refinement]** Filter the output voltage

Answer

**[Distractor Refinement]** Amplify the input voltage

Question 59

**[Clarity and Precision]** In a forward-biased diode, which of the following statements is accurate?

Accepted Answer

**[Correctness and Precision]** Current can flow effortlessly through the diode.

Answer

**[Distractor Refinement]** Current cannot flow through the diode.

Answer

**[Distractor Refinement]** The diode operates in the reverse breakdown region.

Answer

**[Distractor Refinement]** Voltage drop across the diode is negligible.