OXFORD ELECTRIC Specimen questions - Dgca question bank for pilots

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#1. Spare fuses are carried:

at the operators’s discretion.

for generators only.

by law with a stated minimum number required.

by the first officer.

#2. When selecting a fuse for a circuit the governing factor is:

the voltage of the circuit.

the fuse length and diameter.

the resistance of the circuit.

the power requirement of the circuit.

#3. Differential cut-outs close when a differential voltage exists between the:

generator bus and battery bus-bar.

generator bus-bar and earth.

batteries.

battery bus-bar and earth.

#4. Circulating current is the term used to describe:

back EMF.

current necessary to excite the generator.

current passing between two paralleled generators of differing voltage.

current passing between AC and DC systems.

#5. A megohm is:

10 000 ohms

1000 ohms

1 000 000 ohms

1 000 000 000 ohms

#6. Load shedding is:

transferring the loads between generators.

reducing the load voltage.

overall reduction of electrical load on the system.

overall reduction of generator voltages.

#7. the formula for calculating power is

V2 or I2 x R or I x V R

V2 or I x R or I x V R

V or I2 x R or I2 x V R2

V or I x R2 or I x V R2

#8. When a generator is on line and its associated ammeter reads 10 amps, this is an indication of:

BTB’s being energised.

battery charge rate.

battery discharge rate.

generator load.

#9. Assuming a 5 amp circuit has failed during flight and investigation has shown that the fuse is open circuit, the action to be taken is to:

to switch the circuit off immediately.

switch off replace the fuse with another of the correct rating for the circuit and repeat this action as often as necessary.

leave the switch on, replace the failed fuse with one of increased rating.

switch off, replace the failed fuse with one of the correct rating once only.

#10. If the voltage in a circuit is doubled the current will:

double

increase only if the battery is in circuit.

remain the same.

decrease.

#11. A simple electrical circuit has a current flow of 4 amperes and its resistance is 5 ohms. How much power (watts) is used:

20 watts

45 watts

80 watts

100 watts

#12. A lead acid battery voltage should be checked:

on open circuit with a voltmeter.

on load with a voltmeter.

on no load with a voltmeter.

only if a fault is suspected.

#13. Connecting two batteries in series will:

increase the voltage and capacity.

have no effect.

decrease the voltage and the capacity.

increase the voltage, the capacity will remain the same.

#14. An aircraft has a battery with a capacity of 60 A/H. Assuming that it will provide its nominal capacity and is discharged at the 10 hour rate:

it will pass 60 amperes for 10 hours.

it will pass 10 amperes for 6 hours.

it will pass 6 amperes for 10 hours.

it will pass 60 amperes for 1 hour.

#15. A NICAD battery shows a high temperature after engine start, this could be an indication of:

thermal runaway.

it is not connected to the battery bus-bar.

normal temperature during charging.

depends upon the outside air temperature.

#16. When generators are connected in parallel their output voltage must be:

divided by the circuit resistance.

the same.

added together.

controlled by one generator.

#17. In a direct current generating system the voltage regulator controls the system voltage within prescribed limits:

regardless of varying engine RPM and electrical load by inserting a variable resistance in the generator field winding.

by means of a relay which closes contacts in the output circuit when a prescribed voltage is reached.

of the generator rotor speed.

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

#18. A generator or battery cut-out is fitted:

to isolate the battery on touch down.

to prevent the battery from being overcharged.

to allow the generator to be isolated in a crash.

to prevent the battery feeding back into the generator when its voltage is above the generator voltage.

#19. A generator or battery cut-out contacts will close:

with an increase in battery voltage.

with an increase in generator voltage.

at flight idle only.

with an increase in generator current.

#20. Failure of an aircraft generator is indicated by:

a red warning light lighting and the ammeter showing zero or discharge.

a red warning light going out and the ammeter showing a discharge.

a current limiter tripping.

a circuit fuse blowing.

#21. On a twin engine aircraft with a generator fitted to each engine, if the starboard generator fails, will:

the fuel cross feed cocks close.

the starboard engine cut (stop).

the port engine will cut.

both engines will run normally.

#22. On an earth return aircraft wiring circuit:

the negative pole is connected to the aircraft structure.

the positive pole is connected to the aircraft structure.

the negative pole is connected to the positive pole.

two fused are needed.

#23. In a dipole aircraft wiring circuit if the conductors are bridged:

an item of electrical equipment would be burned out.

no immediate action is necessary.

the item of electrical equipment would operate normally.

the fuse or circuit breaker in that circuit will blow.

#24. A circuit breaker that has tripped due to overload:

cannot be reset unless the circuit has returned to normal.

will not be able to be reset in the air.

will reset itself when the circuit returns to normal.

must be replaced.

#25. When changing a blown fuse:

it is changed with one of a lower rating.

the press to reset button is operated.

leave circuit switched on.

it is changed with one of the correct rating.

#26. As the speed of an electric motor increases the back EMF will:

remain the same.

fluctuate.

increase.

decrease.

#27. The output of a shunt wound generator:

will rise gradually as load is applied.

will remain constant as load is applied.

will vary with generator speed.

will fall gradually as load is applied.

#28. Load shedding is:

increasing circuit resistance.

transferring the loads between generators.

reducing the load voltage.

overall reductions of the loads on the system.

#29. An inertia switch on an aircraft will operate:

when selected by the pilot or flight engineer.

automatically in flight.

during an emergency or crash landing.

in flight only.

#30. The purpose of electrical bonding on aircraft is:

to directly earth the positive lead.

to prevent compass malfunctioning and to gather local static charges.

to isolate all components electrically and therefore make the static potential constant.

to provide a low resistance path for earth return circuits and safely dissipate local static charges and lightning strikes.

#31. Electrical components of aircraft systems are screened to:

bond the circuit to reduce risk of fire.

prevent them interfering with the function of radio equipment.

prevent short circuits interfering with aircraft equipment.

prevent engine malfunctions.

Finish