1) A lead-acid battery is considered to be fully charged when the Report

cells begin to gas freely

SG and voltage remain constant for specified period

SG reaches 1.180

2) The preferred method of battery charging a Ni-Cad battery is constant Report

voltage

current

power

3) When a current transformer is disconnected, what should be done? Report

Terminals shorted

Resistor placed across terminals

Left open circuit

4) What does the differential sensing coil sense?. Report

Power

Volts

Current

5) Where does the GCU gets its power? Report

RAT

Battery

PMG

6) Galley loads are wired in Report

series

parallel so load shedding will lower current consumption

either series or parallel depending on the design

7) A fuse-type current limiter Report

can be used as a radio suppressor

limits current flow to a load

opens a circuit after a time/current condition has been exceeded

8) When a load is shed from a busbar, the Report

busbar voltage decreases

current consumption from the bar decreases

busbar voltage increases

9) In unparalleled AC generation systems, the phase rotation of one generator in relation to the others Report

must be BCA

is unimportant

must be synchronised prior to paralleling

10) In a multi-generator system, the generator which takes more than its reactive power share is protected by Report

over-voltage and under-voltage protection circuits

over-current and under-current protection circuits

over-excitation and under-excitation protection circuits

11) Sharing of electrical loads by paralleled DC generators is controlled by Report

equalising circuits which control the field excitation of the generators

automatic load shedding

equalising circuits which control the speed of the generators

12) Excessive commutator sparking can be caused by Report

rotating field diode failure

brushes positioned on MNA

weak spring tension

13) Before checking the SG of a battery recently removed from an aircraft Report

take the temperature of the electrolyte

carry out a capacity test

allow to stabilise for one hour

14) Over-voltage protection circuits are activated Report

before the over voltage limit is exceeded

after a fixed time delay

dependent on the magnitude of the overvoltage

15) A diode connected across a coil will Report

suppress arching when relay is opening and closing

prevent back EMF and allow faster switching

prevent the coil being fitted the wrong way

16) Which fault does not always trip the GCR?. Report

Under-frequency and under-volts

Over-frequency and over-volts

Over-frequency and under-frequency

17) Differential protection in a generating system Report

detects current difference between source and load

detects voltage difference between source and load

uses the volts coil to trip the GCR

18) Open phase sensing on a current transformer Report

is detected using all phases

is detected using any phase

is detected on generator neutral circuit

19) If the battery is switched off in flight, the Report

captain's instruments will be powered from the standby bus

battery is disconnected from bus

generator voltage falls to zero

20) To flash a generator field the Report

generator must be stationary

generator rotates but is not on line

generator is on line and producing a voltage less than the flashing voltage

EASA Questions Module 11 Set 9: Electrical Power

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