1) Which components within a generator control unit connects the output of the field power supply to the generator exciter? Report

Generator control relay

Generator line contactor

Generator power pilot relay

2) In what units are static inverters rated? Report

kVA

kVAR

kW

3) In a generator system, a stability winding is used Report

in series with the field to prevent oscillations

to control output current

to prevent voltage overshoot

4) On engine shutdown, what prevents GCR being tripped? Report

Under-volt

Under-frequency

Under-current

5) How is real and reactive load sharing achieved in an AC parallel generator system?. Report

Real load by control of the constant speed drives, reactive load by adjustment of generator fields

Real and reactive loads by control of the constant speed drives only. Output voltage is controlled by adjustment of generator fields

Real load by control of generator fields, Reactive loads by adjustment of the constant speed drives

6) Other than when there is a fault in an aircraft battery or its charging system, when is the charger switched off automatically? Report

When the battery is used for excessively high discharge currents such as in starting

When the alternators are fully loaded

When there is a failure of one alternator in a split-bus bar system

7) During normal engine shut-down, the generator Report

breaker and control relay are both tripped

breaker is tripped only

control relay is tripped only

8) The generator warning light will come on when Report

voltage is too high

voltage is above battery voltage

voltage is below battery voltage

9) When replacing a current transformer Report

it can be fitted any way round

it can only be fitted one way round

voltage/current selection must be made prior to fitting

10) The economy coil on a relay Report

reduces current required to hold closed

makes it cheaper to make

reduces current required to close

11) What is the function of the generator control relay?. Report

Bring the generator on-line

Connect the generator to the busbar

Control output voltage

12) The current consumed by a DC starter motor will Report

remain constant

increase as the engine speed increases

decrease as the engine speed increases

13) A neutralising agent for sulphuric acid is Report

borax powder

citric acid

sodium bicarbonate

14) In a split bus power distribution system Report

each generator supplies its own bus and distribution system in normal operation

generators are paralleled on connection to the tie bus

power is split between 115V AC and 28V DC

15) Flashing a generator field Report

decreases resistance

restores magnetism.

increases resistance

16) When checking SG of electrolyte of lead acid battery, what should be taken into account?. Report

Electrolyte temperature

Battery charge

Ambient temperature

17) How do you check condition of Ni-Cad battery in situ?. Report

By voltmeter connected to the battery terminal

By voltmeter in the cockpit when battery is off load

By voltmeter in the cockpit, when battery is on load

18) The reactive load circuit in a multi-engined AC generator system Report

modifies generator field excitation current

modifies generator drive speed

modifies generator field excitation voltage

19) A vibrating type voltage regulator uses a volts coil Report

in series with the generator output

in series with the current coil

in parallel with the generator output

20) The purpose of the economy contacts in a relay is to Report

prevent contact pitting and burning

reduce the current required to hold the contacts closed

close the auxiliary contacts before the main contacts

EASA Questions Module 11 Set 10: Electrical System

Set 1: Theory of flight

Set 2: Airframe Structures

Set 3: Aeroplanes-Fuselage

Set 4: Cabin Pressurisation

Set 5: Instruments

Set 6: Avionic system

Set 7: Avionic system

Set 8: Navigation

Set 9: Electrical Power

Set 10: Electrical System

Set 11: Battery

Set 12: Equip & Furnishing

Set 13: Fire Protection

Set 14: Fuel Systems

Set 15: Hydraulic Power

Set 16: Ice & Rain

Set 17: Flight Controls

Set 18: Flight Controls_1

Set 19: Landing Gear

Set 20: Lights

Set 21: Oxygen

Set 22: Pneumatic

Set 23: Water & Waste