Deck 4: Diode Circuits

Question 1

Another name for diode offset voltage is

A) barrier potential.
B) ripple voltage.
C) surge voltage.
D) filtered voltage.

Answer 1

A

Question 2

A clipper is a circuit that removes either positive or negative parts of a waveform.

Answer 2

True

Question 3

If you cascade a clamper and a peak detector,you get a

A) peak-to-peak detector.
B) cascade amplifier.
C) full-wave rectifier.
D) passive clamper.

Answer 3

A

Question 4

The half-wave rectifier has a diode in series with a load resistor.

Question 5

The dc value of a signal is the same as the effective value.

Question 6

The capacitor-input filter produces a dc output voltage equal to the peak value of the rectified voltage.

Question 7

The peak inverse voltage is the maximum voltage across the nonconducting diode of a rectifier.

Question 8

The choke-input filter is seldom used in recent years because of its cost,bulk,and weight.

Question 9

A power supply is the circuit inside electronics equipment that converts the dc input voltage to ac output voltage.

Question 10

It is extremely rare that equipment failure is caused by troubles in the power supply.

Question 11

The full-wave rectifier is equivalent to three half-wave rectifiers.

Question 12

Most power supplies use a slow-blow fuse that can temporarily withstand overloads in current.

Question 13

In electronic equipment power supplies,the transformer steps the line voltage down to lower levels that can more easily be used with semiconductor devices.

Question 14

A diode circuit used to protect a sensitive circuit is called a ________.

A) fuse
B) rectifier
C) filter
D) limiter

Question 15

The bridge rectifier is similar to a full-wave rectifier because it produces a full-wave output voltage.

Question 16

What is the circuit called that adds a dc voltage to the signal?

A) rectifier
B) filter
C) clamper
D) clipper

Question 17

Applying an external voltage to change the reference level of a circuit is called ________.

A) filter
B) bias
C) regulation
D) surge protection

Question 18

When using a capacitor-input filter,the initial rush of current when the power is turned on is called the ripple current.

Question 19

With a half-wave rectifier,the output frequency equals the input frequency.

Question 20

For low-voltage power supplies,the LC filter has been replaced by an integrated circuit.

Question 21

The plus sign on a filter capacitor indicates that it is

A) rectified.
B) filtered.
C) polarized.
D) a battery.

Question 22

Phasing dots that appear at the upper ends of the transformer's schematic symbol mean that the dotted ends have the

A) same instantaneous phase.
B) opposite instantaneous phase.
C) iron core insert.
D) connection for 60 Hz input.

Question 23

The output signal frequency of a full-wave rectifier is

A) half the input frequency.
B) twice the input frequency.
C) equal to the input frequency.
D) alternating current at 60 Hz.

Question 24

Which two diodes conduct during the positive half cycle?

A) D₃ and D₄
B) D₁ and D₂
C) D₂ and D₃
D) D₁ and D₄

Question 25

What is the small ac load voltage that can be measured (with an oscilloscope)at the output of a choke-input filter?

A) peak
B) ripple
C) surge
D) harmonic

Question 26

Half-wave rectifier voltage produces

A) bi-directional current flow.
B) unidirectional current flow.
C) no current flow.
D) alternating current.

Question 27

A step-up transformer will produce a secondary voltage that is

A) smaller than the primary.
B) equal to the primary.
C) larger than the primary.
D) rectified.

Question 28

What is term for a special kind of high frequency power supply used in computers and monitors?

A) crowbar protection
B) half-wave
C) bridge
D) switching regulator

Question 29

What is the output signal across R_L?

A) pulsating dc
B) negative dc pulses
C) square wave
D) alternating current

Question 30

An advantage of the full-wave voltage doubler is

A) it is easier to filter.
B) it is less expensive to configure.
C) it uses less components.
D) it is an IC.

Question 31

Ac ripple measurements can be most accurately made by using

A) an ohmmeter.
B) a multimeter.
C) an oscilloscope.
D) a spectrum analyzer.

Question 32

What is the circuit shown in Figure 4-8 (a)?

A) half-wave rectifier
B) bridge rectifier
C) voltage doubler
D) passive filter

Question 33

What type of power supply circuit is used in high-voltage and low-current devices such as an oscilloscope or computer monitor?

A) clamper
B) clipper
C) half-wave rectifier
D) voltage multiplier

Question 34

What is the circuit shown in Figure 4-6 (a)?

A) half-wave rectifier
B) full-wave rectifier
C) bridge rectifier
D) voltage doubler

Question 35

When neither end of a load resistor is grounded,the load resistor is said to be

A) open.
B) shorted.
C) a voltage divider.
D) floating.

Question 36

By using rectifier diodes and operating at 60 Hz,what type of power supply can be configured?

A) IC
B) voltage doubler
C) passive
D) clipper

Question 37

What is the circuit inside electronics equipment that converts the ac input voltage to an almost perfect dc output voltage?

A) modulator
B) filter
C) power supply
D) transformer

Question 38

The voltage that must be less than the breakdown voltage of the diode as to prevent damage to the diode is the

A) peak inverse voltage.
B) maximum diode voltage.
C) reverse surge voltage.
D) maximum peak voltage.

Question 39

The output frequency of a half-wave rectifier is

A) twice the input frequency.
B) half the input frequency.
C) equal to the input frequency.
D) four times the input frequency.

Question 40

The output as measured across R_L in Figure 4-6 (a)would be

A) pulsating dc.
B) alternating current.
C) negative dc pulses.
D) a square wave.

Question 41

Diodes that are optimized for use at high frequencies and have power ratings less than 0.5 W are

A) high frequency rectifiers.
B) small-signal diodes.
C) large-signal diodes.
D) silicon-controlled rectifiers.

Question 42

More often than not,equipment failure is caused by

A) fuses blowing.
B) resistors shorting.
C) troubles in the power supply.
D) cold solder joints.

Question 43

A circuit that removes all the positive parts of the input signal is a

A) positive clipper.
B) positive clamper.
C) negative clipper.
D) positive voltage doubler.

Question 44

A clamper circuit adds

A) ac to the signal.
B) dc to the signal.
C) resistance to the load.
D) capacitance to the filter.

Question 45

Commercial transformers are not ideal because they produce

A) alternating current.
B) filtered dc.
C) power losses.
D) power gains.

Question 46

What is the type of fuse that can temporarily withstand overloads in current?

A) overload fuse.
B) slow-blow fuse.
C) temporary blow fuse.
D) fast-acting fuse.

Question 47

A device inserted between the bridge rectifier and capacitor-input filter that is used to prevent an onrush of current is called

A) a slow-blow fuse.
B) an op amp.
C) a choke.
D) a surge resistor.

Question 48

What type of filters are configured using resistors,inductors,and capacitors connected between the rectifier and the load resistance?

A) active
B) passive
C) operational amplifier
D) IC