ELECTRIC CIRCUIT PROTECTION AND CAPACITORS – Air – DGCA Question Bank For Politics

#1. In a circuit fitted with a non trip free circuit breaker if a fault occurs and persists:

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

the trip button may be pressed to reset, but not permanently.

a non trip free circuit breaker can never be by-passed.

the reset button may be pressed to make the circuit permanent.

#2. A trip-free circuit breaker that has tripped due to overload:

can be reset and held in during rectification.

can never be reset.

can be reset after overhaul.

maybe reset manually after fault has been cleared.

#3. Circuit breakers and fuses

are used in DC circuits only

are used in AC or DC circuits

are used in AC circuits only

are used in low current circuits only

#4. A trip-free circuit breaker is one which:

cannot be reset by holding the lever in while the fault persists.

can be reset by holding the lever in while the fault persists.

must be held in during checks to find faults.

can be by passed.

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

be made and kept made.

only be made if there is a fuse in the circuit.

reset itself only after a delay of 20 seconds.

not be made and the reset will remain inoperative.

#6. A circuit breaker is a device for:

controlling rotor movement only.

isolating the service on overload.

isolating the battery when using the ground batteries.

earthing the magnetos when switching off.

#7. A non-trip free circuit breaker is:

one which can make a circuit in flight by pushing a button.

a wire placed in a conductor which melts under overload.

another type of voltage regulator.

an on-off type tumbler switch.

#8. A non-trip-free circuit breaker that has tripped due to overload:

can never be reset.

can only be reset on the ground by a maintenance engineer.

can be reset and held in if necessary.

cannot be reset while the fault is still there.

#9. A thermal circuit breaker works on the principle of:

differential expansion of metals.

differential thickness of metals.

differential density of metals.

differential pressure of metals.

#10. Circuit breakers are fitted in:

series with the load.

parallel with the load.

across the load.

shunt with the load.

#11. A fuse is said to have blown when:

an excess current has burst the outer cover and disconnected the circuit from the supply.

the circuit is reconnected.

a current of a higher value than the fuse rating has melted the conductor and disconnected the circuit from the supply.

the amperage has been sufficiently high to cause the fuse to trip out of its holder and has therefore, disconnected the circuit from the supply.

#12. In a fused circuit the fuse is:

in parallel with the load.

in series with the load.

in the conductor between generator and regulator.

only fitted when loads are in series.

#13. Overloading an electrical circuit causes the fuse to ‘Blow’. This:

increases the weight of the insulation.

fractures the fuse case.

disconnects the fuse from its holder.

melts the fuse wire.

#14. What must be checked before replacing a fuse:

the ohms of the circuit.

the amps being used in the circuit.

the amps capacity of the consuming device in the circuit.

the correct fuse volt or watts rating.

#15. The size of fuse required for an electrical circuit whose power is 72 watts and whose voltage is 24 volts is:

24 amps

10 amps

5 amps

15 amps

#16. When selecting a fuse for an aircraft circuit the governing factor is:

the voltage of the circuit.

cable cross sectional area.

resistance of the circuit.

power requirements of the circuit.

#17. A fuse in an electrical circuit is ‘Blown’ by:

cooler air.

the breaking of the glass tube.

excess voltage breaking the fuse wire.

excess current rupturing the fuse wire.

#18. A fuse is used to protect an electrical circuit, it is:

of low melting point.

of high capacity.

of high melting point.

of low resistance.

#19. Fuses:

protect the load.

protect the cable.

protect the generator.

protect both the circuit cable and load.

#20. A current limiter:

is a fuse with a low melting point.

is a circuit breaker.

is a fuse with a high melting point.

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