wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

Power Supply Regulation Quiz

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.

Load regulation of a power supply should be____________

a)

low

b)

high

c)

very high

d)

None

2.

Line regulation of a power supply should be____________

a)

low

b)

high

c)

very high

d)

None

3.

Rectifier converts

a)

ac to pulsating dc

b)

dc to ac

c)

ac to ac

d)

None

4.

The ripple voltage ________When capacitance increases in a power supply

a)

Increases

b)

Decreases

c)

Remains same

d)

None

5.

The ideal % of line regulation should be _____

a)

1

b)

0

c)

0.5

d)

0.75

6.

The ideal % of load regulation should be _____

a)

1

b)

0

c)

0.5

d)

0.75

7.

In a regulated power supply what term describes how much change occurs in the output voltage for a given change in the input voltage

a)

load regulation

b)

voltage regulator

c)

line regulation

d)

ripple voltage

8.

A short circuit has a ________ drop across its terminals and the current is limited only by the surrounding network.

a)

5

b)

0

c)

1

d)

infinity

9.

In a regulated power supply what term describes how much change occurs in the output voltage for a certain range of load current values, from minimum to maximum current

a)

load regulation

b)

voltage regulator

c)

line regulation

d)

ripple voltage

10.

An open circuit can have any voltage across its terminals, but the current is always _______.

a)

5A

b)

0A

c)

1A

d)

INFINITY

11.

In an unregulated power supply, if load current increases, the output voltage ………..

a)

Remains the same

b)

Decreases

c)

Increases

d)

None of the above

12.

In an unregulated power supply, if input a.c. voltage increases, the output voltage …….

a)

Increases

b)

Decreases

c)

Remains the same

d)

None of the above

13.

Commercial power supplies have voltage regulation ………….

a)

of 10%

b)

of 15%

c)

of 25%

d)

within 1%

14.

Line regulation is represented in terms of________.

a)

percentage

b)

decibels

c)

current

d)

none of the above

15.

SMPS is used for

a)

obtaining controlled ac power supply

b)

obtaining controlled dc power supply

c)

storage of dc power

d)

switch from one source to another

16.

Which one of the following is the main advantage of SMPS over linear supply

a)

No transformer required

b)

Only one stage of conversion

c)

No filter is required

d)

Low power dissipation

17.

In linear power supply series pass transistor operates in _________ region

a)

Saturation

b)

Active

c)

Cut off

d)

None

18.

In switch mode power supply series pass transistor operates in _________ region

a)

Saturation

b)

Active

c)

Cut off

d)

both a & C

19.

Which type of IC voltage regulator there is a continuous variation in the impedance of transistor in order to supply the desired amount of load current?

a)

Linear regulators

b)

Switching regulators

c)

Both a and b

d)

None

20.

Switching regulators are series type regulators, which has ______ power dissipation & ______ efficiency.

a)

increased, increased

b)

increased, reduced

c)

reduced, increased

d)

reduced, reduced

21.

In series voltage regulator, transistor operates in _________region

a)

Saturation

b)

Active

c)

Cut off

d)

None

22.

In _________ voltage regulator control element is in series to the load

a)

Series

b)

Shunt

c)

Switch mode

d)

None

23.

Voltage regulators normally use

a)

Negative feedback

b)

Positive feedback

c)

No feedback

d)

Phase limiting

24.

Which among the following factors affect/s the output voltage of a regulated power supply?

a)

Load current

b)

Input voltage

c)

Temperature

d)

All of the above

25.

Voltage regulators keep a constant …………output voltage when the input or load varies within limits.

a)

DC

b)

AC

c)

ripple

d)

None

26.

Voltage regulators require

a)

Only line regulation

b)

Only load regulation

c)

A constant load

d)

Load and line regulation

27.

A Zener diode utilises ………… characteristic for voltage regulation

a)

Forward

b)

Reverse

c)

Both forward and reverse

d)

None of the above

28.

A Zener diode is used as a …………… voltage regulating device

a)

Shunt

b)

Series

c)

Series-shunt

d)

None of the above

29.

A Zener voltage regulator is used for …………… load currents

a)

High

b)

Very high

c)

Moderate

d)

Small

30.

A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes ……………

a)

Less than load current

b)

Zero

c)

More than load current

d)

None of the above

31.

Which of these is the best description for a Zener diode?

a)

It is a diode

b)

It is a constant current device

c)

It is a constant-voltage device

d)

It works in the forward region

32.

Two similar 15 V Zeners are connected in series. What is the regulated output voltage?

a)

15 V

b)

5 V

c)

30 V

d)

45 V

33.

In _________ short circuit protection ,the short circuit current gets equal to the rated current When short occur at load

a)

Crow bar

b)

Fold back

c)

Simple current limiting

d)

All these

34.

Which of the following is a short circuit protection circuit

a)

Simple current Limiting

b)

crow bar

c)

fold back

d)

a & c

35.

Short circuit protections which provide less power dissipation for the series pass transistor

a)

Fold back current limiting

b)

Simple current limiting

c)

Crow bar

d)

None of these

36.

Without current limiting, a short circuit load will probably

a)

Produce zero load current

b)

Destroy diodes and transistors

c)

Have load voltge equal to the zener voltage

d)

Have too little load current

37.

During regulation, the power dissipation of the pass transistor equals the collector-emitter voltage times the

a)

Base current

b)

Load current

c)

Zener current

d)

Foldback current

38.

Simple current limiting produces too much heat in the _____

a)

zener diode

b)

load resistor

c)

pass transistor

d)

ambient air

39.

A current sensing resisttor in short circuit protection is usually

a)

zero

b)

small

c)

large

d)

open

40.

With fold back current limiting, the load voltage approaches zero and the load current approaches to ……….

a)

A small value

b)

Infinity

c)

The zener current

d)

A destructive level

41.

If the output of a voltage regulator varies from 20 to 19.8V when the line voltage varies over its specified range, the source regulation is

a)

0%

b)

1%

c)

2%

d)

5%

42.

The output impedance of a voltage regulator is

a)

Very small

b)

Very large

c)

Equal to the load voltage divided by the load current

d)

Equal to the input voltage divided by the output current

43.

If the output of a voltage regulator varies from 15 to 14.7V between the minimum and maximum load current, the load regulation is

a)

0%

b)

1%

c)

2%

d)

5%

44.

SCR is used in ……… circuit

a)

voltage regulator

b)

current regulator

c)

crow bar

d)

over load current

45.

The usual way to protect a load from excessive supply voltage is with a…………. Circuit

a)

crow bar

b)

zener diode

c)

Thyristor

d)

none of the above

46.

An scr is usually turned on by

a)

Break over

b)

A gate trigger

c)

Break down

d)

Holding current

47.

Opamp based SVR provides

a)

Good regulation

b)

Accuracy

c)

Good efficiency

d)

All the above

48.

An op amp based negative regulator has

a)

PNP transistor as control element

b)

.-Ve input

c)

.-Ve reference voltage

d)

All the above

49.

Which of the following IC is a variable regulator?

a)

LM723

b)

LM317

c)

L7805

d)

a&b

50.

How many terminals do the 7800 series fixed positive voltage regulators have

a)

2

b)

3

c)

4

d)

5

51.

The 78XX series of voltage regulators produces an output voltage that is

a)

Positive

b)

Negative

c)

Either positive or negative

d)

Unregulated

52.

The 7812 produces a regulated output voltage of

a)

3V

b)

4V

c)

12V

d)

40V

53.

The 7912 regulator IC provides ________output.

a)

12V

b)

9V

c)

negative 12V

d)

5V

54.

The output voltage of 7915 is _____V

a)

5V

b)

-15

c)

15

d)

9

55.

IC 7805 is a …….. Voltage regulator

a)

negative

b)

positive

c)

adjustable

d)

none of the above

56.

IC 7905 is a …….. Voltage regulator

a)

negative

b)

positive

c)

adjustable

d)

none of the above

57.

Regulators are used in________.

a)

powersupplies

b)

sensors

c)

transducers

d)

none of the above

58.

The dropout voltage of standard monolithic linear regulators is closest to

a)

0.3 V

b)

0.7 V

c)

2 V

d)

3.1 V

59.

Thermal shutdown occurs in an IC regulator if

a)

Power dissipation is too high

b)

Internal temperature is too high

c)

Current through the device is too high

d)

All the above occur

60.

A current booster is a transistor in

a)

Series with the IC regulator

b)

Parallel with the IC regulator

c)

either series or parallel

d)

Shunt with the load

Similar Resources on Wayground

CIS Microsoft Excel (Review)

62 questions

CIS Microsoft Excel (Review)

quiz

Worksheet

•

9th Grade - Professio...

CompTIA Security + : Architecture and Design

64 questions

CompTIA Security + : Architecture and Design

quiz

Worksheet

•

Professional Development

A) phrasal verbs

57 questions

A) phrasal verbs

quiz

Worksheet

•

12th Grade - Professi...

PRINCE 2 - Sample Paper 1 (60Q)

60 questions

PRINCE 2 - Sample Paper 1 (60Q)

quiz

Worksheet

•

Professional Development

021122

55 questions

021122

quiz

Worksheet

•

Professional Development

TRY OUT PPPK

65 questions

TRY OUT PPPK

quiz

Worksheet

•

Professional Development

OSI Layer

65 questions

OSI Layer

quiz

Worksheet

•

University - Professi...

UK Driving Test

58 questions

UK Driving Test

quiz

Worksheet

•

Professional Development