Question 1

A circuit is disconnected by isolators when
A)line is energized
B)there is no current in the line
C)line is on full load
D)circuit breaker is not open

Accepted Answer

Isolators are used to disconnect a circuit when there is no current in the line, ensuring safety during maintenance or repair by physically separating the circuit from the power source.

Question 2

For which of the following equipment current rating is not necessary ?
A)Circuit breakers
B)Isolators
C)Load break switch
D)Circuit breakers and load break switches

Accepted Answer

Isolators are devices used for isolating a circuit when it is not carrying load, hence they do not have a current rating as they do not interrupt current under normal operational conditions. They are operated only when the circuit is dead or there is no current flowing through it.

Question 3

In a substation the following equipment is not installed
A)exciters
B)series capacitors
C)shunt reactors
D)voltatre transformers

Accepted Answer

Exciters are typically installed in power plants on generators to control the voltage output, not in substations. Substations usually contain equipment like series capacitors, shunt reactors, and voltage transformers for managing power flow and voltage levels.

Question 4

jCorona usually occurs when the electrostatic stress in air around the conductor exceeds
A)6.6 kV (r.m.s. value)/cm
B)11 kV (r.m.s. value)/cm
C)22 kV (maximum value)/cm
D)30 kV (maximum v^lue)/cm

Accepted Answer

The answer of jCorona usually occurs when the electrostatic stress...

Question 5

The voltage drop, for constant voltage transmission is compensated by installing
A)inductors
B)capacitors
C)synchronous motors
D)all of above

Accepted Answer

The answer of The voltage drop, for constant voltage transmission...

Quiz 3: Transmission System and Equipment

A circuit is disconnected by isolators when

For which of the following equipment current rating is not necessary ?

In a substation the following equipment is not installed

jCorona usually occurs when the electrostatic stress in air around the conductor exceeds

The voltage drop, for constant voltage transmission is compensated by installing