Question 1

The transient voltages that appears across the contacts at the instant of arc extinction is called ..............voltage

Accepted Answer

A) Supply 
B) Recovery 
C) Restriking 
D) Peak 
A) Supply 
B) Recovery 
C) Restriking 
D) Peak C

Question 2

Which of the following is the least expensive protection for over current in lowvoltage system ?

Accepted Answer

A) Rewireable fuse 
B) Isolator 
C) Oil circuit breaker 
D) Air break circuit breaker 
A) Rewireable fuse 
B) Isolator 
C) Oil circuit breaker 
D) Air break circuit breaker A

Question 3

Over voltage protection is recommended for

Accepted Answer

A) Hydro electric generators 
B) Steam turbine generators 
C) Gasturbine generators 
D) All of the above 
A) Hydro electric generators 
B) Steam turbine generators 
C) Gasturbine generators 
D) All of the above D

Question 4

For which of the following ratings of the transformer differential protection is recommended?

Accepted Answer

A) Above 30 KVA 
B) Equal to and above 5 MVA 
C) Equal two and above 25 MVA 
D) None of the above 
A) Above 30 KVA 
B) Equal to and above 5 MVA 
C) Equal two and above 25 MVA 
D) None of the above

Question 5

The actuating quantity for the relays may be

Accepted Answer

A) Magnitude 
B) Frequency 
C) Phase angle 
D) Any of the above 
A) Magnitude 
B) Frequency 
C) Phase angle 
D) Any of the above

Question 6

The short-circuit in any winding of the transformer is the result of

Accepted Answer

A) Mechanical vibration 
B) Insulation failure 
C) Loose connection 
D) Impulse voltage 
A) Mechanical vibration 
B) Insulation failure 
C) Loose connection 
D) Impulse voltage

Question 7

SF6 gas

Accepted Answer

A) Is yellow in colour 
B) Is lighter than air 
C) Is non-toxic 
D) Has pungent small 
A) Is yellow in colour 
B) Is lighter than air 
C) Is non-toxic 
D) Has pungent small

Question 8

SF6 gas is transported in

Accepted Answer

A) Air cylinders 
B) Gas cylinders 
C) Liquid from in cylinders 
D) Solid form in boxes 
A) Air cylinders 
B) Gas cylinders 
C) Liquid from in cylinders 
D) Solid form in boxes

Question 9

Switching over voltage arc are more hazardous than lighting surges in case of

Accepted Answer

A) Unbalanced systems 
B) Low-voltages 
C) 11 KV systems 
D) EHV and UHV systems 
A) Unbalanced systems 
B) Low-voltages 
C) 11 KV systems 
D) EHV and UHV systems

Question 10

Overfluxing protection is recommended for

Accepted Answer

A) Distribution transformer 
B) Generator transformer of the power plant 
C) Auto transformer of the power plant 
D) Station transformer of the power plant 
A) Distribution transformer 
B) Generator transformer of the power plant 
C) Auto transformer of the power plant 
D) Station transformer of the power plant

Question 11

The operating speed of a relay depends upon the

Accepted Answer

A) Rate of flux built up 
B) Armature core air gap 
C) Spring tension 
D) All of these 
A) Rate of flux built up 
B) Armature core air gap 
C) Spring tension 
D) All of these

Question 12

Least number of faults are generally reported for

Accepted Answer

A) Transmission lines 
B) Cables 
C) Switchgears 
D) Transformers 
A) Transmission lines 
B) Cables 
C) Switchgears 
D) Transformers

Question 13

Short-circuit currents are due to

Accepted Answer

A) Single phase to ground faults 
B) Phase to phase faults 
C) Three phase faults 
D) Any of these 
A) Single phase to ground faults 
B) Phase to phase faults 
C) Three phase faults 
D) Any of these

Question 14

Inverse time current relays are used for the protection of

Accepted Answer

A) Feeders 
B) Transformers 
C) Alternators 
D) Both A and B 
A) Feeders 
B) Transformers 
C) Alternators 
D) Both A and B

Question 15

In distance protection, the relay measures

Accepted Answer

A) Negative sequence impedance of the light from relay up to the fault point 
B) Positive sequence impedance of the line from relay up to the fault point 
C) Self impedance of the line from relay up to the fault point 
D) Zero sequence impedance of the line from relay up to the fault point 
A) Negative sequence impedance of the light from relay up to the fault point 
B) Positive sequence impedance of the line from relay up to the fault point 
C) Self impedance of the line from relay up to the fault point 
D) Zero sequence impedance of the line from relay up to the fault point

Question 16

IDMT relays are used to protect the power transformers against

Accepted Answer

A) External short-circuit 
B) Over loads 
C) Internal short-circuits 
D) Both A and B 
A) External short-circuit 
B) Over loads 
C) Internal short-circuits 
D) Both A and B

Question 17

For which of the following protection from negative sequence current is provided?

Accepted Answer

A) Generators 
B) Motors 
C) Transmission line 
D) Transformers 
A) Generators 
B) Motors 
C) Transmission line 
D) Transformers

Question 18

Hey switchgear is device used for

Accepted Answer

A) Interrupting an electrical circuit 
B) Switching an electrical circuit 
C) Reaching and controlling an electrical circuit 
D) Switching, controlling and protecting the electrical circuit and equipment 
A) Interrupting an electrical circuit 
B) Switching an electrical circuit 
C) Reaching and controlling an electrical circuit 
D) Switching, controlling and protecting the electrical circuit and equipment

Question 19

For the protection of power station buildings against direct strokes the requirements are

Accepted Answer

A) Interception 
B) Interception and conduction 
C) Interception, conduction and dissipation 
D) Interception,conduction,dissipation and reflection 
A) Interception 
B) Interception and conduction 
C) Interception, conduction and dissipation 
D) Interception,conduction,dissipation and reflection

Question 20

The line insulation is............. the insulation level at the station equipment

Accepted Answer

A) Less than 
B) Same as 
C) More than 
D) Not directly related with 
A) Less than 
B) Same as 
C) More than 
D) Not directly related with

The transient voltages that appears across the contacts at the instant of arc extinction is called ..............voltage

Which of the following is the least expensive protection for over current in lowvoltage system ?

Over voltage protection is recommended for

For which of the following ratings of the transformer differential protection is recommended?

The actuating quantity for the relays may be

The short-circuit in any winding of the transformer is the result of

SF6 gas

SF6 gas is transported in

Switching over voltage arc are more hazardous than lighting surges in case of

Overfluxing protection is recommended for

The operating speed of a relay depends upon the

Least number of faults are generally reported for

Short-circuit currents are due to

Inverse time current relays are used for the protection of

In distance protection, the relay measures

IDMT relays are used to protect the power transformers against

For which of the following protection from negative sequence current is provided?

Hey switchgear is device used for

For the protection of power station buildings against direct strokes the requirements are

The line insulation is............. the insulation level at the station equipment

Electrical Protection and Circuit Breakers

Electrical Protection and Transmission Line Characteristics

Power System Protection and Equipment

Electrical Protection and Safety: Part A

Electrical Protection and Safety: Part B

Protective Relays and Circuit Breakers for Electrical Systems

Circuit Breakers and Fuses

Electric Arc and Circuit Breaker Protection

Electrical Components and Circuit Breakers

Relaying Schemes and Techniques for Electrical Equipment Protection

Understanding Relays for Power System Protection

Filters

Exam 10: Electrical Protection and Switchgear

The transient voltages that appears across the contacts at the instant of arc extinction is called ..............voltage

Which of the following is the least expensive protection for over current in lowvoltage system ?

Over voltage protection is recommended for

For which of the following ratings of the transformer differential protection is recommended?

The actuating quantity for the relays may be

The short-circuit in any winding of the transformer is the result of

SF6 gas

SF6 gas is transported in

Switching over voltage arc are more hazardous than lighting surges in case of

Overfluxing protection is recommended for

The operating speed of a relay depends upon the

Least number of faults are generally reported for

Short-circuit currents are due to

Inverse time current relays are used for the protection of

In distance protection, the relay measures

IDMT relays are used to protect the power transformers against

For which of the following protection from negative sequence current is provided?

Hey switchgear is device used for

For the protection of power station buildings against direct strokes the requirements are

The line insulation is............. the insulation level at the station equipment

Electrical Protection and Circuit Breakers

Electrical Protection and Transmission Line Characteristics

Power System Protection and Equipment

Electrical Protection and Safety: Part A

Electrical Protection and Safety: Part B

Protective Relays and Circuit Breakers for Electrical Systems

Circuit Breakers and Fuses

Electric Arc and Circuit Breaker Protection

Electrical Components and Circuit Breakers

Relaying Schemes and Techniques for Electrical Equipment Protection

Understanding Relays for Power System Protection

Filters