SWITCH GEAR QUIZ

The relay operating coil is supplied through

None of these

current transformer

power transformer

fuse

TRUE ANSWER : ?
YOUR ANSWER : ?

The rate of rise of restriking voltage depends on

both inductance and capacitance of the system

the type of circuit breaker

the inductance of the system only

the capacitance of the system only

TRUE ANSWER : ?
YOUR ANSWER : ?

A _______ is used to measure the stator % winding temperature of the generator.

pyrometer

thermocouple

thermometer

resistance thermometer

TRUE ANSWER : ?
YOUR ANSWER : ?

The rated secondary current of current transformer for relays is generally

20 A

30 A

10 A

5 A

TRUE ANSWER : ?
YOUR ANSWER : ?

The fusing factor is

always less than 1

always more than 1

None of these

always 1

TRUE ANSWER : ?
YOUR ANSWER : ?

The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

2

6

4

8

TRUE ANSWER : ?
YOUR ANSWER : ?

To protect most of the electrical equipment handling low power, the types of relays used are

Electronic and bimetallic

Both of the listed here

Thermocouple

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

To reduce short circuit fault currents......... are used.

None of these

capacitors

resistors

reactors

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following circuit breakers is prefered for EHT applications ?

bulk oil circuit breaker

low oil circuit breaker

air break circuit breaker

Sf6 CB

TRUE ANSWER : ?
YOUR ANSWER : ?

An isolator is designed to open a circuit under

normal conditions

full load

no load

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

↑