Question 1

In a static over current relay, inverse time characteristics are obtained by

Accepted Answer

A) A transistor amplifier 
B) An integrating circuit 
C) A transistor switch 
D) A differentiating circuit 
A) A transistor amplifier 
B) An integrating circuit 
C) A transistor switch 
D) A differentiating circuit

Question 2

For ground fault we prefer

Accepted Answer

A) Plain impedance relay 
B) Directional over current relay 
C) Mho relay 
D) Reactance relay 
A) Plain impedance relay 
B) Directional over current relay 
C) Mho relay 
D) Reactance relay

Question 3

For protection of parallel feeders fed from one end, the relays required are

Accepted Answer

A) Nondirectional relays at the source end and directional relay at the load end 
B) Nondirectional relay at both ends 
C) Directional relay at source end and nondirectional relay at load end 
D) Directional relay at both ends 
A) Nondirectional relays at the source end and directional relay at the load end 
B) Nondirectional relay at both ends 
C) Directional relay at source end and nondirectional relay at load end 
D) Directional relay at both ends

Question 4

How many relays are used to detect interphase fault of a three line system?

Accepted Answer

A) One 
B) Two 
C) Three 
D) Six 
A) One 
B) Two 
C) Three 
D) Six

Question 5

The under voltage relay can be used for

Accepted Answer

A) Generators 
B) Bus bars 
C) Transformers 
D) All of the above 
A) Generators 
B) Bus bars 
C) Transformers 
D) All of the above

In a static over current relay, inverse time characteristics are obtained by

For ground fault we prefer

For protection of parallel feeders fed from one end, the relays required are

How many relays are used to detect interphase fault of a three line system?

The under voltage relay can be used for

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

Electrical Protection and Switchgear

Understanding Relays for Power System Protection

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Exam 11: Relaying Schemes and Techniques for Electrical Equipment Protection

In a static over current relay, inverse time characteristics are obtained by

For ground fault we prefer

For protection of parallel feeders fed from one end, the relays required are

How many relays are used to detect interphase fault of a three line system?

The under voltage relay can be used for

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

Electrical Protection and Switchgear

Understanding Relays for Power System Protection

Filters