DC Electrics - Circuit Protection and Capacitors: DGCA Technical General questions

Question 1

In a circuit fitted with a non-trip free circuit breaker if a fault occurs and persists:

Accepted Answer

If the reset button is depressed and held in, the circuit will be made

Answer

The trip button may be pressed to reset, but not permanently

Answer

A non-trip free circuit breaker can never be bypassed

Answer

The reset button may be pressed to make the circuit permanent

Question 2

A trip free circuit breaker that has tripped due to overload:

Accepted Answer

May be reset manually after fault has been cleared

Answer

Can be reset and held in during rectification

Answer

Can never be reset

Answer

Can be reset after overhaul

Question 3

Circuit breakers and fuses:

Accepted Answer

Are used in AC or DC circuits

Answer

Are used in DC circuits only

Answer

Are used in AC circuits only

Answer

Are used in low current circuits only

Question 4

A trip free circuit breaker is one which:

Accepted Answer

Cannot be reset by holding the lever in while the fault persists

Answer

Can be reset by holding the lever in while the fault persists

Answer

Must be held in during checks to find faults

Answer

Can be bypassed

Question 5

If the reset button is pressed in the trip free circuit breaker, the contacts with the fault cleared will:

Accepted Answer

Be made and kept made

Answer

Only be made if there is a fuse in the circuit

Answer

Reset itself only after a delay of 20 seconds

Answer

Not be made and the reset will remain inoperative

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