FURNACE TECHNOLOGY QUIZ

Which of the following is used in liquid fuses ?

carbon tetrachloride

distilled water

transformer oil

sulphur hexafluoride

TRUE ANSWER : ?
YOUR ANSWER : ?

The arc voltage produced in AC circuit breaker is always

None of these

lagging the arc current by 90°

In phase with the arc current

leading the arc current by 90°

TRUE ANSWER : ?
YOUR ANSWER : ?

SF 6 gas

is lighter than air

is yellow in colour

has pungent small

Is nontoxic

TRUE ANSWER : ?
YOUR ANSWER : ?

Air blast circuit breakers for 400 kV power system are designed to operate in

100 micro-second

0.1 sec

50 milli-second

0.5 sec

TRUE ANSWER : ?
YOUR ANSWER : ?

Breaking capacity of a circuit breaker is usually expressed in terms of

MVA

Mw

volts

amperes

TRUE ANSWER : ?
YOUR ANSWER : ?

Admittance relay is

None of these

non-directional relay

directional relay

impedance relay

TRUE ANSWER : ?
YOUR ANSWER : ?

Minimum arcing voltage will be least in case of

graphite

tungsten

carbon

silver

TRUE ANSWER : ?
YOUR ANSWER : ?

The operating time of a fuse is about

0.8 sec

0.002 sec

1.5 sec

1 sec

TRUE ANSWER : ?
YOUR ANSWER : ?

The torque produced in induction type relay is

proportional to the current

inversely proportional to the current

proportional to square of the current

inversely proportional to the square of the current

TRUE ANSWER : ?
YOUR ANSWER : ?

Outdoor switchgear is generally used for voltage beyond

132 kV

33 kV

66 kV

11 kV

TRUE ANSWER : ?
YOUR ANSWER : ?

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