The material used for fuse must have_____________?

Byadmin December 17, 2018August 11, 2021

The material used for fuse must have_____________?

A. low melting point and high specific resistance
B. low melting point and -low specific resistance
C. high melting point and low specific resistance
D. low melting point and any specific resistance

Switchgear and Protection

The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?

The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?

A. lengthening of the gap
B. cooling and blast effect
C. both (A) and (B)
D. deionizing the oil with forced air
E. none of the above

Read More The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?
Switchgear and Protection

The ground wire should not be smaller than No _________ copper

The ground wire should not be smaller than No _________ copper

A. 2
B. 4
C. 6
D. 10

Read More The ground wire should not be smaller than No _________ copper
Switchgear and Protection

To reduce short circuit fault currents are used_____________?

To reduce short circuit fault currents are used_____________?

A. reactors
B. resistors
C. capacitors
D. none of the above

Read More To reduce short circuit fault currents are used_____________?
Switchgear and Protection

The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

A. heavy loads
B. internal short-circuits
C. external short-circuits
D. all of the above

Read More The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
Switchgear and Protection

Series capacitors are used to_________________?

Series capacitors are used to_________________?

A. compensate for line inductive reactance
B. compensate for line capacitive reactance
C. improve line voltage
D. none of the above

Read More Series capacitors are used to_________________?
Switchgear and Protection

The short circuit in any winding of the transformer is the result of______________?

The short circuit in any winding of the transformer is the result of______________?

A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage

Read More The short circuit in any winding of the transformer is the result of______________?

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