Part66EASA Module11A.6 Electrical Power (2of 3)

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The test is based on EASA Aircraft Maintenance Licence Programme

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When a lead acid battery is in discharge condition the specific gravity of electrolyte will
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1 point

increase

decrease

remains constant

Rotating field stationary armature AC generators output is taken from
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through slip rings

connections on the stator

through commutator

A dc generator will be connected to the bus bar after the reverse current cutout contact close due to
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contact closes by voltage coil

increasing generator voltage

with the contact closed by aircraft battery

When using ac power on the busbar ,28 volt dc is required for battery charging ,can be achieved
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Current transformer

ac transformer rectifier unit

step up transformer

An APU generator can normally be used during flight as a backup supply
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RAT generator fails to operate

if the main aircraft supply fails

Over voltage

The three voltages of a three phase generator are
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90 degree apart

180 degree apart

120 degree apart

The frequency of an ac generator is dependent on the
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the strength of the magnetizing force

no. of pairs of poles and and the speed of the motor

the excitation current

To restore the level of electrolyte which has been lost due to normal gassing during battery charging
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electrolyte be added in cells to restore electrolyte

distilled water must be added

electrolyte mixed with distilled water be added

The output of the DC generator is controlled by varying the field current
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varying the current of the output.

varying the resistance of the output.

varying the field current.

With a vibrating contact type voltage regulator the adjustment of generator voltage is carried out by
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alteration of contact spring tension

adjusting the resistance value to be inserted in field

adjusting the field reactance

While installing aircraft batteries the last lead to connect is
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negative

positive

the smaller positive pin

If a Ni- Cd aircraft battery is not required for immediate service ,it should be stored in
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fully charge condition

it's terminals be properly insulated and kept in upright position.

fully discharge condition

In a dc shunt generator if load is increased the voltage will
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decrease

increase

remains constant

When checking specific gravity of the electrolyte in a battery
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each cell be checked as the reading may differ

alternate cell be checked as the reading may differ

only one cell be checked as the reading will not differ

Speed of an alternator may be controlled by
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changing the no. of poles

constant speed drive

reduction gear assembly

To prevent corrosion at the terminals of a lead acid battery
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keep electrolyte level low

apply petroleum jelly

charge the battery at frequent interval

12 volt lead acid battery has

1 point

6 cells

12 cells

4 cells

A frequency wild supply would be suitable for
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radio communication

deicing load

navigational frequency suitability

A generator at 30 kva , power factor 0.8 has a maximum continuous power output of
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30 KW.

37.5 KW.

24 KW.

Method of maintaining a constant voltage output from an a/c generator under varying condition of speed and load is to vary the
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speed of the constant speed drive

strength of the magnetic field

strength of the armature field

which aircraft circuit would be most likely to use frequency wild 200 V AC

0 points

Hydraulic pump.

Windscreen heating.

Standby compass.

Vibrating contact voltage regulator sensing coil is
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in parallel with the field winding

in series with the field winding

armature winding

To adjust the voltage output of the ac generator while maintaining constant frequency ,it is necessary

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to alter the field current

to alter the armature current

to adjust the shunt field current

The rpm of a 6 pole,400Hz alternator is
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4000

8000

6000

In a delta winding generator fitted on turbine engine
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line volts equals phase volts

line current equals phase current

line volts equals √3 phase volts

Two 12 volt 25 AH batteries connected in series will produce
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24 volt with 25 Ampere hour

12 volt with 50 Ampere hour

24 volt 50 Ampere hour

For battery charging, the electrical supply connected to the battery must be
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regulated ac

Two similar 12 volt batteries connected in parallel will produce

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12 volt emf with twice the capacity of each battery

24 volt with twice the capacity of each battery

12 volt emf with the same capacity of each battery

On a dc series generator without a voltage regulator ,if the load increases ,the generator output voltage will
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decrease

increase

will remain same

The correct way to determine the state of charge of a nickel cadmium battery is by checking
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voltage of battery under load

specific gravity

terminal voltage

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