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MCQ's Importance of Power Quality in Power Systems

 If you think you have a good understanding of Importance of Power Quality in Power Systems,  challenge yourself and take our quiz. 

 

Best of Luck.!!

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Question 1 of 19

Power quality is the ability of system to 

A

Supply power efficiently

B

Consume the power supplied to it

C

Both (a) and (b)

D

None of the above

Question 2 of 19

In technical terms, power system is the measure, study, and enhancement of sinusoidal wave form at the rated

A

Current and voltage

B

Power and voltage

C

Voltage and frequency

D

None of the above

Question 3 of 19

The cause of poor power quality in transmission line is:

A

Wind

B

Voltage fluctuation

C

Lightning

D

All of the above

Question 4 of 19

In distribution system, power quality is disturbed due to:

A

Voltage dips

B

Transformer energization

C

Both (a) and (b)

D

None of the above

Question 5 of 19

Non-linear loads produces 

A

Sinusoidal current

B

Non sinusoidal current

C

DC current

D

None of the above

Question 6 of 19

Transients are the pulses occurring in a sinusoidal waveform for a _______ but of _______:

A

Long duration, low intensity

B

Long duration, high intensity

C

Small duration, high intensity

D

Small duration, low intensity

Question 7 of 19

Voltage variation can be caused due to:

A

Equipment failure

B

Control malfunction

C

Inrush current

D

All of the above

Question 8 of 19

Unbalanced voltage means, voltage of 3 phase systems:

A

Unequal magnitude

B

Unequal phase difference

C

Unequal magnitude or phase difference

D

None of the above

Question 9 of 19

Which value of power factor shows a high power quality?

A

zero

B

0.5

C

0.7

D

0.9

Question 10 of 19

Flickers can be caused due to:

A

Load changes

B

Motor drives

C

Welding machines

D

All of the above

Question 11 of 19

From the following types given below, ____ is not a type of distorted wave form

A

DC offset

B

Electric noise

C

Harmonics

D

None of the above

Question 12 of 19

Poor power quality can cause:

A

Equipment damage

B

Cost effect

C

Poor efficiency

D

All of the above

Question 13 of 19

Which power quality standard is defined for electric power distribution for industrial plants?

A

IEEE 242-1986

B

IEEE 141-1993

C

IEEE 1159-1995

D

IEEE 519-1992

Question 14 of 19

Which standard is defined for transient on low voltage power and signal line?

A

IEEE 242-1986

B

IEEE 141-1993

C

IEC 816-1984

D

IEC 868-0-1991

Question 15 of 19

To suppress harmonics from system, which device is used:

A

Surge protective device

B

Filter

C

Regulators

D

Oscillators

Question 16 of 19

To protect system from voltage spikes, which device is used:

A

Surge protective device

B

Filter

C

Regulators

D

Oscillators

Question 17 of 19

To protect the system from varying voltages, which device is used:

A

Filter

B

Voltage regulators

C

Oscillators

D

UPS

Question 18 of 19

Power quality monitoring helps in:

A

Power quality control

B

Energy management

C

Improve system’s performance

D

All of the above

Question 19 of 19

For power quality monitoring, which equipment are used?

A

Fault recorder and relay

B

Power transformer

C

UPS

D

Filters

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