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MCQ's Protection & Coordination Fundamentals for Utility Distribution Systems

If you think you have a good understanding of Protection & Coordination Fundamentals for Utility Distribution Systems,  challenge yourself and take our quiz. 

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Question 1 of 11

In an instantaneous overcurrent relay, if the pickup value is set at 1000 A and an overcurrent fault occurs at 900 A. The relay will:

A

Issue a trip signal

B

No trip signal issues

C

None of the above

Question 2 of 11

In an instantaneous overcurrent relay, if the pickup value is set at 1000 A and an overcurrent fault occurs at 1100 A. The relay will:

A

Issue a trip signal with no delay

B

No trip signal issues

C

None of the above

Question 3 of 11

In an inverse time-overcurrent relay, if the pickup value is set at 100 A and an overcurrent fault occurs at 110 A. The relay will:

A

Issue a trip signal instantly

B

Issues a trip signal after some delay

C

No trip signal issues

D

None of the above

Question 4 of 11

In an inverse time-overcurrent relay, if the pickup value is set at 100 A and an overcurrent fault occurs at 1000 A. The relay will:

A

Issue a trip signal instantly

B

Issues a trip signal with almost no delay

C

No trip signal issues

D

None of the above

Question 5 of 11

In power system protection, N-1 redundancy means that if one device fails to detect and clear fault, then there should be at least _____ device at backup to detect and clear fault:

A

One

B

Two

C

Three

D

Four

Question 6 of 11

In power system protection, N-2 redundancy means that if one device fails to detect and clear fault, then there should be at least _____ device at backup to detect and clear fault:

A

One

B

Two

C

Three

D

Four

Question 7 of 11

A time current curve is drawn on:

A

Simple graph

B

Log-log graph

C

Semi-log graph

D

None of the above

Question 8 of 11

The most common faults at distribution end is:

A

Single line to ground fault

B

Line to line fault

C

Double line to ground fault

D

Three phase faults

Question 9 of 11

In the given figure below, if someone forgets to turn off HLWS, and a fault occurs at fuse end, then:

A

Fuse will try to clear fault first

B

Recloser will clear the fault

C

Recloser is enable, as HLWS is on

D

None of the above

Question 10 of 11

In reclosers, there is a feature of SEF (Sensitive Earth Fault), which is operated when there is an abnormal for:

A

One second

B

One minute

C

One hour

D

One millisecond

Question 11 of 11

Ground faults can be identified by which sequence component:

A

Positive

B

Negative

C

Zero

D

None of the above

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