GENERATORS AND ALTERNATORS – Air – DGCA Question Bank For Politics

#1. An EMF is induced in a conductor rotating in a magnetic field by:

capacitive reaction.

the reverse current relay.

electro transmission.

electro magnetic induction.

#2. Magnetic field strength is controlled by:

battery bus bar current.

current in the field coil.

current in the armature.

current flow to the battery.

#3. If a conductor is placed in a magnetic field:

an EMF is induced in the conductor.

an EMF is induced in the conductor only when the conductor rotates.

the applied resistance assists the back EMF.

an EMF is induced in the conductor only when the conductor is stationary.

#4. The output of a basic generator before commutation is:

AC

DC and after commutation is AC.

DC

synchronised AC and DC.

#5. An internally excited generator is one where:

the field is produced within the distribution.

the field is initiated by a HT and LT coil.

the field is initiated by the battery.

the field is initiated within the generator.

#6. A DC generator has a commutator whose purpose is to:

change AC to give a generator output of DC.

change DC to AC.

transmit the generator output to the electrical circuit and to cool the generator.

maintain a constant resistance.

#7. Another name for a number of conductors rotating in a magnetic field is:

a capacitor.

an armature.

a condenser.

a commutator.

#8. The voltage regulator:

senses cut out pressure and adjusts field current.

senses generator output pressure and adjusts field current.

senses generator output current and adjusts the field voltage.

senses back EMF.

#9. The generator master switch is normally:

fitted with a mechanical safety catch.

in the field circuit which is connected in parallel with the generator output.

in the field circuit which is in parallel with the voltage regulator.

fitted in series with the commutator.

#10. The voltage regulator:

provides a constant current flow from the generator with changes of generator speed.

senses current output.

maintains a steady generator voltage with changes of generator speed.

regulates the amount of current supplied by the battery to operate the generator.

#11. The voltage regulator:

provides a constant current flow from the generator with changes of generator speed.

senses current output.

maintains a steady generator voltage with changes of generator speed.

regulates the amount of current supplied by the battery to operate the generator.

#12. Voltage is controlled in a generator by:

a reverse current relay.

moving the brushes.

a voltage regulator.

it is uncontrollable.

#13. On aircraft, generator voltage is regulated by:

varying the generator field strength.

increasing and decreasing the load.

changing the generator speed.

changing generator load.

#14. In an aircraft having a battery with a nominal voltage of 24v, generator output would be:

24 volts.

28amps.

28 volts.

24 amps.

#15. In DC electrical generating systems, the voltage regulator controls the system voltage within prescribed limits:

regardless of varying engine RPM and electrical load, by varying the current in the generator field windings.

by means of a relay which closes contacts in the output line when a certain RPM is reached.

by temperature.

by a variable resistance which limits the voltage given by the batteries.

#16. A voltage regulator is fitted to:

prevent high circulating currents.

prevent backlash.

to ensure correct voltage output to battery.

to prevent battery feedback to the generator.

#17. If an aircraft electrical system is quoted as 24 volts DC the output of the generator is:

12 volts with the generators connected in series.

28 volts with the generators connected in parallel.

36 volts with the generators connected in series/parallel.

42 volts.

#18. If a circuit is designed for 12 volts - the generator will:

give parallelled output only.

give controlled 14 volts.

14 volts wild DC.

give controlled 12 volts.

#19. The aircraft electrical generator output is controlled in flight by:

sensing the generator output pressure.

ram air.

a resistance in the generator output circuit.

the resistance of the armature circuit.

#20. In a generator control circuit the strength of the magnetic field is controlled by:

the commutator.

the voltage regulator

the reverse current contactor.

the output C/B.

Dgca Question Bank For Pilots

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