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Switchgear Assembly and Function Quiz

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Questions and Answers

What is the main purpose of switchgear?

To distribute power to customers
To operate at high voltages
To generate electrical power
To control and protect electrical circuits and equipment (correct)

Why can't a tumbler switch with an ordinary fuse be used profitably on high voltage systems?

It cannot interrupt large fault current successfully (correct)
It is not cost-effective
It has a time delay in blowing the fuse
It requires frequent replacement of the fuse

What problem arises when a fuse blows on high voltage systems?

The risk of serious damage to costly equipment (correct)
The cost of replacing the fuse
The interruption of power supply to customers
The inability to control domestic appliances

Why are automatic protective devices or switchgears required for high voltage systems?

To prevent damage to electrical equipment from heavy currents during short circuits (B) Signup and view all the answers

What is the key disadvantage of using a tumbler switch with an ordinary fuse on high voltage systems?

Inability to interrupt large fault current successfully (B) Signup and view all the answers

What is the primary function of a circuit breaker in an automatic protective equipment system?

To open or close an electrical circuit under normal and abnormal conditions (C) Signup and view all the answers

Why might a circuit breaker be preferable to a fuse in certain instances?

Capable of opening and closing circuits without replacement (C) Signup and view all the answers

What happens when heavy current flows through the primary of the current transformer (CT)?

The secondary e.m.f. induced in the CT increases (A) Signup and view all the answers

How is an arc extinguished in a circuit breaker during opening?

By using oil, air blast, vacuum, or SF6 gas (B) Signup and view all the answers

What is the role of the relay in an automatic protective equipment system?

To detect faults in the electrical circuit (C) Signup and view all the answers