Question 1

In a circuit breaker, ionisation is facilitated by_________________.

Accepted Answer

A) Increase in field strength. 
B) Increase in mean free length. 
C) High temperature of the surrounding medium. 
D) All of the above. 
A) Increase in field strength. 
B) Increase in mean free length. 
C) High temperature of the surrounding medium. 
D) All of the above.

Question 2

Rate of rise of restriking voltage depend on_____________?

Accepted Answer

A) Type of circuit breaker. 
B) Capacitance of the system. 
C) Inductance of the system. 
D) Both (b) and (c) 
A) Type of circuit breaker. 
B) Capacitance of the system. 
C) Inductance of the system. 
D) Both (b) and (c)

Question 3

Why do the SF6 gases have an excellent heat transfer property?

Accepted Answer

A) Low gaseous viscosity. 
B) High dielectric strength. 
C) Higher molecular weight. 
D) Both (a) and (c) 
A) Low gaseous viscosity. 
B) High dielectric strength. 
C) Higher molecular weight. 
D) Both (a) and (c)

Question 4

Which of the following should have low value for the contacts and their material?

Accepted Answer

A) Thermal capacity. 
B) Contact resistance. 
C) Thermal conductivity. 
D) None of above. 
A) Thermal capacity. 
B) Contact resistance. 
C) Thermal conductivity. 
D) None of above.

Question 5

The air blast circuit breakers for 400 kV systems are designed to operate in how much time?

Accepted Answer

A) 0.1 s 
B) 0.5 s 
C) 50 ms 
D) 100µs 
A) 0.1 s 
B) 0.5 s 
C) 50 ms 
D) 100µs

In a circuit breaker, ionisation is facilitated by_________________.

Rate of rise of restriking voltage depend on_____________?

Why do the SF6 gases have an excellent heat transfer property?

Which of the following should have low value for the contacts and their material?

The air blast circuit breakers for 400 kV systems are designed to operate in how much time?

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

Electric Arc and Circuit Breaker Protection

Electrical Components and Circuit Breakers

Electrical Protection and Switchgear

Relaying Schemes and Techniques for Electrical Equipment Protection

Understanding Relays for Power System Protection

Filters

Exam 7: Circuit Breakers and Fuses

In a circuit breaker, ionisation is facilitated by_________________.

Rate of rise of restriking voltage depend on_____________?

Why do the SF6 gases have an excellent heat transfer property?

Which of the following should have low value for the contacts and their material?

The air blast circuit breakers for 400 kV systems are designed to operate in how much time?

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

Electric Arc and Circuit Breaker Protection

Electrical Components and Circuit Breakers

Electrical Protection and Switchgear

Relaying Schemes and Techniques for Electrical Equipment Protection

Understanding Relays for Power System Protection

Filters