Quiz about AC Circuit Clipper Quiz

Question 1

What is a circuit that limits the peaks of both half cycles of an AC signal called?

Accepted Answer

Double-end clipper

Answer

Single-end clipper

Answer

Half-wave rectifier

Answer

Full-wave rectifier

Question 2

In a double-end clipper circuit, what happens when the positive input voltage is greater than the value of VB1?

Accepted Answer

Diode D1 conducts

Answer

Diode D2 conducts

Answer

Both diodes conduct

Answer

Both diodes are reverse-biased

Question 3

What do the battery symbols in the double-end clipper circuit indicate?

Accepted Answer

VB1 and VB2 are DC voltages

Answer

Actual batteries are used

Answer

VB1 and VB2 are AC voltages

Answer

The circuit is powered by batteries

Question 4

What is the main advantage of a bridge rectifier compared to a half-wave rectifier?

Accepted Answer

It produces a non-interrupted DC pulse voltage.

Answer

It uses only the positive cycle of the AC wave.

Answer

It requires no transformer.

Answer

It reduces the AC voltage by half.

Question 5

What role does a smoothing capacitor play in a rectifier circuit?

Accepted Answer

It filters out the pulses from the output waveform.

Answer

It increases the AC voltage.

Answer

It decreases the resistance.

Answer

It amplifies the DC voltage.

Question 6

How is the time constant (T) in a smoothing circuit determined?

Accepted Answer

By multiplying the capacitance by the resistance.

Answer

By multiplying the resistance by the voltage.

Answer

By dividing the capacitance by the resistance.

Answer

By adding the capacitance and resistance.

Question 7

What is the main advantage of using a full-wave rectifier circuit compared to a series circuit?

Accepted Answer

It improves efficiency.

Answer

It separates DC pulses.

Answer

It converts DC to AC.

Answer

It increases AC voltage.

Question 8

In a center-tapped full-wave rectifier circuit, what happens to the AC voltage?

Accepted Answer

It is halved.

Answer

It doubles.

Answer

It remains the same.

Answer

It is quartered.

Question 9

What is the role of the diodes in the full-wave rectifier circuit?

Accepted Answer

To convert AC to DC.

Answer

To increase AC voltage.

Answer

To separate DC pulses.

Answer

To ground the transformer coil.

Question 10

What is the primary function of a diode in a half-wave rectifier circuit?

Accepted Answer

To supply unidirectional current to the load

Answer

To allow current to flow in both directions

Answer

To increase the AC voltage

Answer

To decrease the DC voltage

Question 11

What happens to the diode when the AC sine wave input is positive?

Accepted Answer

It acts as a closed circuit

Answer

It acts as an open circuit

Answer

It becomes reverse biased

Answer

It blocks the current flow

Question 12

What is a limitation of the half-wave rectifier?

Accepted Answer

It wastes half of the AC voltage

Answer

It rectifies the entire AC voltage

Answer

It increases the AC voltage

Answer

It allows current to flow in both directions

Question 13

What is the main difference between a clamper circuit and a single-ended clipper?

Accepted Answer

A clamper circuit uses a capacitor instead of a resistor.

Answer

A clamper circuit uses a resistor instead of a capacitor.

Answer

A clamper circuit uses a diode instead of a capacitor.

Answer

A clamper circuit uses a resistor instead of a diode.

Question 14

What is the purpose of a clamper circuit in electronic voltmeters?

Accepted Answer

To add a DC component to the output without changing the input AC signal.

Answer

To amplify the input signal.

Answer

To decrease the amplitude of the input signal.

Answer

To convert AC to DC.

Question 15

During which part of the AC input cycle is the diode in a clamper circuit forward biased?

Accepted Answer

Negative half

Answer

Positive half

Answer

Both halves

Answer

Neither half

Question 16

What happens to the output waveform in a clamper circuit?

Accepted Answer

It is shifted by an amount equal to the negative peak value of the input voltage.

Answer

It is inverted.

Answer

It is amplified.

Answer

It is reduced to zero.

Question 17

What does a voltage doubler consist of according to Figure 38?

Accepted Answer

A clamper circuit and a peak rectifier circuit

Answer

Two peak rectifier circuits

Answer

A single diode and a capacitor

Answer

A transformer and a rectifier

Question 18

Why is a full-wave voltage doubler more efficient than a half-wave doubler?

Accepted Answer

It is more efficient for the same reason a full-wave rectifier is more efficient than a half-wave rectifier

Answer

It uses fewer components

Answer

It has a higher output voltage

Answer

It requires less input voltage

Question 19

During the positive half of the input cycle in a voltage doubler, which diode conducts?

Accepted Answer

D1

Answer

D2

Answer

Both D1 and D2

Answer

Neither D1 nor D2

Question 20

What is the output voltage of a full-wave voltage doubler as shown in Figure 39?

Accepted Answer

2Vm

Answer

Vm

Answer

3Vm

Answer

4Vm

Question 21

What is the purpose of circuits like voltage triplers and voltage quadruplers?

Accepted Answer

To develop very high voltage power supplies for microwave and radar equipment

Answer

To reduce power consumption in electronic devices

Answer

To increase the speed of electronic signals

Answer

To decrease the size of electronic components

Question 22

What is the basic idea extended in the design of voltage triplers?

Accepted Answer

Voltage doubling

Answer

Voltage reduction

Answer

Current amplification

Answer

Signal modulation

Question 23

What is the primary function of a Silicon Controlled Rectifier (SCR)?

Accepted Answer

To act as a switching device

Answer

To amplify signals

Answer

To store electrical energy

Answer

To convert AC to DC

Question 24

How many junctions are forward biased in a four-layer semiconductor construction of an SCR?

Accepted Answer

Two

Answer

One

Answer

Three

Answer

Four

Question 25

What happens when voltage is applied to the gate of an SCR?

Accepted Answer

The SCR becomes latched or locked on

Answer

The SCR becomes non-conductive

Answer

The SCR decreases its resistance

Answer

The SCR increases its capacitance

Question 26

In which applications are SCRs commonly used?

Accepted Answer

Power switching, phase controls, battery chargers

Answer

Low voltage lighting

Answer

Audio amplifiers

Answer

Digital signal processing

Question 27

What is the purpose of using SCRs in lighting dimmer systems?

Accepted Answer

To reduce the average voltage applied to the lights

Answer

To increase the brightness

Answer

To convert AC to DC

Answer

To stabilize the power supply

Question 28

How is the average voltage reduced in an SCR circuit?

Accepted Answer

By controlling the pulses to the SCR gate

Answer

By increasing the current flow

Answer

By using larger resistors

Answer

By shortening the AC cycle

Question 29

What is a Schottky diode designed to have on one side of the junction?

Accepted Answer

Metal, such as gold, silver, or platinum

Answer

Pure semiconductor material

Answer

Insulating material

Answer

Magnetic material

Question 30

What is the typical switching time for a Schottky diode?

Accepted Answer

300 MHz

Answer

100 MHz

Answer

500 MHz

Answer

50 MHz

Question 31

What is the reverse recovery time of a Schottky diode compared to a typical PN semiconductor?

Accepted Answer

Much shorter

Answer

Much longer

Answer

The same

Answer

Slightly longer

Question 32

What is the voltage drop of a Schottky diode compared to a silicon diode?

Accepted Answer

0.15 volts versus 0.7 volts

Answer

0.7 volts versus 0.15 volts

Answer

1.0 volts versus 0.5 volts

Answer

0.5 volts versus 1.0 volts

Question 33

What happens when a diode is forward biased?

Accepted Answer

The energy is visible in the form of light with a color characteristic of the material.

Answer

The energy is absorbed and not visible.

Answer

The energy is visible in the form of heat.

Answer

The diode stops functioning.

Question 34

What is a common use of LEDs in electronic devices?

Accepted Answer

As "power on" indicators and displays.

Answer

As a source of heat.

Answer

As a replacement for batteries.

Answer

As a cooling mechanism.

Question 35

How are LEDs typically arranged in devices like calculators?

Accepted Answer

In seven-segment displays.

Answer

In a circular pattern.

Answer

In a single line.

Answer

In a random arrangement.

Question 36

What happens when a negative voltage is applied to all cathodes except LED "E" in a seven-segment display?

Accepted Answer

The number "9" is displayed.

Answer

The number "0" is displayed.

Answer

The number "6" is displayed.

Answer

The display turns off.

Question 37

Which semiconductor material is associated with infrared light?

Accepted Answer

Gallium arsenide (GaAs)

Answer

Zinc selenide (ZnSe)

Answer

Indium gallium nitride (InGaN)

Answer

Silicon carbide (SiC)

Question 38

What is the primary advantage of LEDs over incandescent lamps?

Accepted Answer

Longer life

Answer

Higher energy consumption

Answer

More heat generation

Answer

Slower on and off operations

Question 39

In a forward biased diode, what happens to electrons?

Accepted Answer

They cross the junction and fall into holes

Answer

They remain stationary

Answer

They emit sound

Answer

They change color

Question 40

What type of light can LEDs be designed to radiate?

Accepted Answer

Red, green, yellow, blue, and infrared light

Answer

Ultraviolet light

Answer

X-rays

Answer

Gamma rays

Question 41

What is dissipated as light in a light-emitting diode?

Accepted Answer

Energy

Answer

Sound

Answer

Heat

Answer

Water

Question 42

What is the role of photons in light-sensitive diodes?

Accepted Answer

They increase the energy level of electrons above what is needed to hold them in orbit.

Answer

They decrease the energy level of electrons.

Answer

They have no effect on the energy level of electrons.

Answer

They convert electrons into protons.

Question 43

What happens in the depletion area of a reversed biased PN junction in photodiodes?

Accepted Answer

The device turns "on" and allows current to flow.

Answer

The device turns "off" and stops the current flow.

Answer

The device remains neutral with no current flow.

Answer

The device explodes due to excess energy.

Question 44

What effect does thermal energy have on a diode?

Accepted Answer

It produces minority carriers.

Answer

It decreases the number of minority carriers.

Answer

It has no effect on minority carriers.

Answer

It destroys minority carriers.

Question 45

What is one application of photodiodes mentioned in the text?

Accepted Answer

Light detecting circuits

Answer

Solar panels

Answer

Battery chargers

Answer

Electric motors

Question 46

What is a varactor diode also known as?

Accepted Answer

Varicap

Answer

Zener

Answer

Schottky

Answer

Tunnel

Question 47

What does the capacitance of a varactor diode depend on?

Accepted Answer

Applied voltage

Answer

Temperature

Answer

Frequency

Answer

Current

Question 48

In a varactor diode, what do the N and P materials function like?

Accepted Answer

Plates of a common capacitor

Answer

Resistors

Answer

Inductors

Answer

Transistors

Question 49

What is the area surrounding the junction of the P and N materials in a PN junction called?

Accepted Answer

Depletion region

Answer

Conduction band

Answer

Valence band

Answer

Insulation layer

Question 50

What effect does forward biasing have on the depletion region of a varactor diode?

Accepted Answer

It decreases the size of the depletion region.

Answer

It increases the size of the depletion region.

Answer

It has no effect on the depletion region.

Answer

It completely eliminates the depletion region.

Question 51

What is the relationship between the capacitance of a varactor and the applied reverse bias?

Accepted Answer

Inversely proportional

Answer

Directly proportional

Answer

Unrelated

Answer

Exponentially proportional

Question 52

What happens to the depletion region when reverse-bias voltage is applied to a PN junction?

Accepted Answer

The depletion region increases in size.

Answer

The depletion region decreases in size.

Answer

The depletion region remains the same.

Answer

The depletion region disappears.

Question 53

What is the typical ratio of varactor capacitance to reverse-bias voltage change?

Accepted Answer

10 to 1

Answer

1 to 1

Answer

5 to 1

Answer

20 to 1

Question 54

What happens to the capacitance of a varactor when the reverse bias is increased from 3 volts to 6 volts?

Accepted Answer

It decreases to 5 picofarads

Answer

It increases to 20 picofarads

Answer

It remains the same

Answer

It increases to 10 picofarads

Question 55

What is one advantage of using a varactor in tuning circuits?

Accepted Answer

It allows a DC voltage to tune a circuit

Answer

It requires no power

Answer

It increases the frequency range

Answer

It decreases the circuit size

Question 56

What is the function of the radio-frequency choke in the circuit shown in Figure 59?

Accepted Answer

To provide high inductive reactance

Answer

To increase the capacitance

Answer

To decrease the voltage

Answer

To block DC from the tank

Question 57

What is one of the greatest dangers to a diode?

Accepted Answer

Heat

Answer

Excessive voltage

Answer

Low current

Answer

Cold temperatures

Question 58

What is the term used when a diode draws excessive current due to increased heat?

Accepted Answer

Thermal runaway

Answer

Thermal expansion

Answer

Thermal contraction

Answer

Thermal equilibrium

Question 59

Which of the following should be avoided when working with diodes?

Accepted Answer

Inserting a diode with voltage applied

Answer

Using a direct replacement diode

Answer

Ensuring correct diode direction

Answer

Testing with allowable voltage

Question 60

What should be ensured when testing a diode?

Accepted Answer

Test voltage is below maximum

Answer

Test voltage exceeds maximum

Answer

Test voltage is irrelevant

Answer

Test voltage is doubled

Question 61

What type of diodes are heavily doped silicon diodes that exhibit an abrupt reverse breakdown at relatively low voltages?

Accepted Answer

Zener diodes

Answer

Schottky diodes

Answer

Light-emitting diodes

Answer

Tunnel diodes

Question 62

What is the typical voltage range for Zener diodes with reverse breakdown?

Accepted Answer

2.4 V to 91 V

Answer

1.5 V to 50 V

Answer

5 V to 100 V

Answer

10 V to 200 V

Question 63

What makes Zener diodes ideal for use as a voltage regulator?

Accepted Answer

Their constant voltage during reverse breakdown

Answer

Their ability to emit light

Answer

Their high forward current capacity

Answer

Their low power consumption

Question 64

What is the purpose of the series resistor (RS) in a simple voltage regulator using a Zener diode?

Accepted Answer

To limit the Zener current

Answer

To increase the voltage

Answer

To decrease the current

Answer

To amplify the signal

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