What does the generator cut-out prevent?

Battery feeding current back into the generator

What does the generator differential cut-out prevent?

Circulating currents between generators

What does the generator or alternator warning light indicate?

Generator voltage has fallen below battery voltage

What is the function of the master switch in an aircraft?

To isolate the generator or alternator

What does the charge/discharge ammeter display?

Current flow into or out of the battery

What does the meter display about the current flow into or out of the battery?

The alternator is working and supplying power.

The load meter displays actual current draw.

The alternator is not supplying power.

What happens if an alternator fails in flight?

All operating electrical equipment begins to deplete the battery.

The pilot can ignore the situation.

The alternator will start working again.

What is the function of bus bars in an aircraft?

They are the collection and distribution center for power supply.

They are used to measure current.

They are used to start the engines.

They are only for backup power.

What is load shedding?

Turning off non-essential equipment to conserve battery power.

Increasing the load on the battery.

A method to charge the battery faster.

What is the primary function of a distribution system in an aircraft?

To ensure power-consuming equipment is not deprived of power.

To supply power to all equipment.

What are vital services required for after an emergency wheels-up landing?

Crash switch operation of fire extinguishers

What is the purpose of load shedding in the power supply system?

Overall reduction of electrical loads

What happens when one generator fails?

It is isolated from its bus bar

What is the role of the battery bus bar?

Always connected to the battery

Isolated during generator failure

What is the significance of the essential services bus bar?

Supplies power to essential services

Isolates non-essential services

In an electrical circuit the reverse current cut-out relay will open:

when battery voltage exceeds generator voltage

when circuit voltage is less than generator voltage

when the main output CB is reset

A generator cut-out is provided:

to prevent the battery from being overcharged

to prevent the battery over heating

to allow the generator to be isolated in a crash

to prevent discharge of the battery through the generator

A generator cut-out will open when:

generator voltage falls below battery voltage

circuit loads equal the battery voltage

the air temperature reaches 45°C

circuit loads equal the generator voltage

A generator cut-out is fitted to prevent:

the battery discharging through the generator windings

the generator overcharging the battery

fire in the event of overloading the system

To prevent circulating currents when more than one generator is being connected to the same bus bar:

reverse current relays are fitted

the generators are connected in series

A generator cut-out is fitted:

in series with the generator output

in parallel with the generator output

In a two-engine aircraft with two generators, there would be:

one ammeter for each generator and one voltmeter switchable to indicate either generator voltage or battery voltage

one voltmeter for each generator. and one ammeter switchable to indicate either generator current or battery current

one ammeter showing the total output and one switchable voltmeter

one ammeter and one voltmeter each showing the average current and voltage output

In an aircraft electrical system which incorporates a voltmeter, the voltmeter indicates:

the flow in the electrical system after the battery cut-out contacts close

the flow in the electrical system before the battery cut-out contacts close

the pressure in the electrical system before and after the cut-out contacts close

If the generator warning light comes on in flight it indicates that:

the generator is not feeding the battery bus bar

the generator is feeding the battery bus bar

A generator failure is usually indicated by:

the ammeter reading decreasing or showing a discharge and a red warning lamp lighting

the voltmeter reading increasing, the ammeter reading showing discharge and a red lamp lighting

the current consuming devices failing to operate

A generator warning light will be illuminated:

when the battery voltage exceeds that of the generator and the cut-out has opened

when the generator is not feeding the battery bus bar

DC Electrics - Aircraft Power Systems Quiz

46 questions

Show all answers

1.

OPEN ENDED QUESTION

3 mins • 1 pt

What is the power system for a single-engine aircraft?

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2.

OPEN ENDED QUESTION

3 mins • 1 pt

What is a dipole or two wire system?

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3.

OPEN ENDED QUESTION

3 mins • 1 pt

What is a single pole (unipole or earth return) system?

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4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the most common type of system on an aircraft with metal construction?

Single Pole (Unipole or Earth Return) System

Dual Pole System

Isolated System

Grounded System

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What do generators or alternators convert?

Mechanical energy to electrical energy

Electrical energy to mechanical energy

Chemical energy to electrical energy

Thermal energy to electrical energy

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the Voltage Regulator maintain?

Output voltage of the generator or alternator

Input voltage of the battery

Current flow in the circuit

Temperature of the generator

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of an overvoltage protection unit?

To protect against dangerously high output voltage

To increase the generator output

To maintain battery voltage

To convert AC to DC

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DC Electrics - Aircraft Power Systems

What is the power system for a single-engine aircraft?

What is a dipole or two wire system?

What is a single pole (unipole or earth return) system?

What is the most common type of system on an aircraft with metal construction?

What do generators or alternators convert?

What does the Voltage Regulator maintain?

What is the purpose of an overvoltage protection unit?

What does the generator cut-out prevent?

What do rectifiers in the alternator end frame do?

What do rectifiers in the alternator end frame do?

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