In the event of complete AC generator failure in an AC split bus-bar generation system, how is power maintained to the essential AC bus-bar?

By power fed from a battery supplied static inverter.

By power fed from static inverter only.

By power fed from a hot battery bus-bar only.

A Constant Speed Drive aims at ensuring

that the electric generator produces a constant frequency.

equal AC voltage from all generators.

that the CSD remains at a constant RPM not withstanding the generator RPM

A thermal circuit breaker:

protects the system in the event of overheating, even without exceeding the maximum permissible current.

can be reset without any danger even if the fault remains.

Slow blow fuses are designed to open only:

on a continued overload, such as a short circuit.

In an aeroplane utilising a constant frequency AC power supply, DC power is obtained from a:

3 phase current transformer unit

A rectifier is a unit that

produces a DC output from AC input.

prevents rectified current from occurring in the electrical system.

transforms one Ac-voltage to a greater / smaller AC-voltage.

In a split bus power distribution system.

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.

An AC generator connected to a CSD requires.

no voltage regulator as the CSD will control generator frequency.

no voltage regulator as the CSD will control the voltage.

An increase in the speed of a DC generator will cause the voltage to rise with the following resultant action in the voltage regulator.

The volts coil to increase its magnetic field thus decreasing the field excitation.

The volts coil to exert more pull thus increasing the current in the generator field.

The volts coil to exert less pull thus increasing the resistance of the carbon pile.

To restore the level of electrolyte which has been lost due to normal gassing during battery charging.

electrolyte of the same specific gravity as that contained in the battery must be added.

When checking the specific gravity of the electrolyte in a battery.

each cell should be checked as the readings may differ

one cell only need be checked as the remainder will read the same.

only the end cells need be checked as they contain the terminals.

Before taking S.G. readings of a lead-acid battery recently removed from an aircraft.

the electrolyte temperature must be noted.

a period of 1 hour should have elapsed to allow the S.G. to stabilize.

the battery must be charged at the 10 hour rate for one hour

A battery which is assumed to be 100% efficient and to have a capacity of 60 ampere-hours at the 10 hour rate will deliver.

60 amps for 10 hours or 6 amps for 10 hours depending upon the rate of demand.

When using A.C. power on the bus bar you require 28V D.C. for battery charging.

an A.C. transformer and rectifier would be required.

a D.C. transformer and rectifier would be required.

an A.C. inverter would be required.

If a nicad battery overheats, it is an indication of.

the generator is not connected to the bus bar.

the generator voltage regulator setting is too low.

When mixing electrolyte for lead acid batteries.

the method of mixing is unimportant.

To parallel an alternator with another alternator the alternators must have the same.

frequency, voltage and phase relationship.

frequency, RPM and phase relationship.

The APU generator can normally be.

used during flight as a back-up supply if the main aircraft supply fails.

connected in parallel with the aircraft's main generators.

connected in parallel with the ground power supply.

Transformer rectifier unit (TRU) change.

single phase to direct current.

three phase AC to direct current.

Assume a constant speed DC generator providing a constant output voltage. If the electrical load increases, the voltage regulator will :

increase the intensity of the excitation current.

decrease the intensity of the excitation current.

maintain the intensity of the excitation current constant.

The primary purpose of the reverse current relay is to :

Prevent the battery from delivering current to the generator.

Prevent the generator from delivering current to the generator.

Prevent the generator from delivering too much current.

The output voltage of DC generators used in aircraft is normally regulated by:

Controlling the current in the field windings.

Varying the RPM of the generator.

Controlling the current in the armature (anker) windings.

The purpose of the voltage regulator is to :

Keep a constant voltage output from the generator

Keep a constant power output from the generator.

The frequency of an AC generator is dependent upon the :

number of pairs of poles and the speed of the rotor.

field strength and the speed of the rotor.

number of individual poles and the field strength.

A CSD unit which has been disconnected in flight :

may be reset on the ground only, after engine shut-down.

automatically resets at engine shut-down.

may be reset in flight using the reset mechanism.

The frequency of the current provided by an alternator depends on...

the strength of the excitation current

Generator paralleling through busbars is done to assure that

all consumers receive the same generator voltage

the biggest generator gets the highest load.

different consumers can be fed from different sources.

On detection of a persistent overvoltage fault on an AC generator connected to the aircraft AC busbars, the on-board protection device opens:

the exciter breaker, the generator breaker and tie breaker.

the exciter breaker and the generator breaker.

The generator breaker and tie breaker

A toilet is fitted with thermal protection.

to protect against the dangers of smoke and fire in the event of an overheat.

to protect against freezing at altitude.

to protect against continuous flushing.

sys 4 - 76 den 153

Authored by Khoa Phùng

English

3rd Grade

Used 1+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The main generators typically supply a maximum of:

120 kilovolt amps (KVA)

90 kilovolt amps (KVA)

250 kilovolt amps (KVA)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The small pins in the power connector plug are.

neutral.

positive.

negative.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When an overvolt is present on an AC generator system, the tripping circuit.

trips after a time delay.

trips after a time delay inversely proportional to overvolt amplitude.

trips at a set level.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an AC distribution system, the purpose of the synchronising bus-bar is to.

supply essential services.

provide interconnection between the generator load busbars.

provide a means of monitoring the load.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The moving part in an AC generator is usually referred to as the:

oscillator.

stator.

rotor.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The function of a constant speed drive (CSD) in an AC generating system is to :

vary the engine rpm (within limits) to compensate for various AC loads.

vary generator rpm in order to compensate for various AC loads.

drive the generator at a constant speed.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Zener diodes are for.

voltage stabilisation.

rectification.

voltage regulation.

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sys 4 - 76 den 153

The main generators typically supply a maximum of:

The small pins in the power connector plug are.

When an overvolt is present on an AC generator system, the tripping circuit.

In an AC distribution system, the purpose of the synchronising bus-bar is to.

The moving part in an AC generator is usually referred to as the:

The function of a constant speed drive (CSD) in an AC generating system is to :

Zener diodes are for.

AC generator output indications are measured in.

In the event of complete AC generator failure in an AC split bus-bar generation system, how is power maintained to the essential AC bus-bar?

A 3 phase AC generator has 3 separate stator windings spaced at :

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