11.6 Electrical Power Flashcards by John Watts

What are possible sources of AC power on an aircraft?

A) AC generators, fuel pumps, and batteries
B) Static inverters, rotary inverters, and AC generators
C) Hydraulic pumps, AC generators, and static inverters

B) Static inverters, rotary inverters, and AC generators

How well did you know this?

Not at all

Perfectly

In a rotating field alternator, which component is stationary?

A) Field
B) Armature
C) Rotor

B) Armature

How well did you know this?

Not at all

Perfectly

What does CSD stand for?

A) Constant Speed Drive
B) Consistent Spindle Drive
C) Constant Spindle Distance

A) Constant Speed Drive

How well did you know this?

Not at all

Perfectly

What device is used to convert variable engine speed into a constant output drive speed for a generator?

A) Variable Speed Drive (VSD)
B) Constant Speed Drive (CSD)
C) Auxiliary Power Unit (APU)

B) Constant Speed Drive (CSD)

How well did you know this?

Not at all

Perfectly

What does IDG Stand for?

A) International Distance Generation
B) Instant Drive Generator
C) Integrated Drive Generators

C) Integrated Drive Generators

How well did you know this?

Not at all

Perfectly

What is a key advantage of the Integrated Drive Generator (IDG) compared to the traditional two-unit system?

A) It uses more fuel
B) It is heavier and larger
C) It is lighter and smaller

C) It is lighter and smaller

How well did you know this?

Not at all

Perfectly

How many Generator Control Units (GCUs) are there for each generator?

A) One
B) Two
C) Three

A) One

How well did you know this?

Not at all

Perfectly

What are the three parts the functions can be divided into?

A) Generation, distribution, storage
B) Regulation, protection, switching
C) Conversion, transmission, grounding

B) Regulation, protection, switching

How well did you know this?

Not at all

Perfectly

What does GCU stand for?

A) Ground Control Unit
B) Generator Control Unit
C) General Circuit Unit

B) Generator Control Unit

How well did you know this?

Not at all

Perfectly

What is the aircraft battery generally used to supply?

A) Cabin lighting and entertainment systems
B) Emergency power and APU starter motor power
C) Hydraulic pump power and air conditioning

B) Emergency power and APU starter motor power

How well did you know this?

Not at all

Perfectly

What is one function of the aircraft battery?

A) To power the landing gear
B) To provide electrical power capable of starting the engines
C) To operate the fuel system

B) To provide electrical power capable of starting the engines

How well did you know this?

Not at all

Perfectly

What are the two main types of aircraft batteries fitted to aircraft?

A) Ni-Cd and Lithium-ion
B) Ni-Cd and Lead-acid
C) Lead-acid and Alkaline

B) Ni-Cd and Lead-acid

How well did you know this?

Not at all

Perfectly

Which type of battery is most common today despite earlier problems with Thermal Runaway (TR)?

A) Lead-acid
B) Ni-Cd
C) Lithium-ion

B) Ni-Cd

How well did you know this?

Not at all

Perfectly

Which part of the aircraft electrical system is protected by the electronic circuits of the GCU instead of fuses or circuit breakers?

A) Battery feeder lines
B) Generator feeder lines
C) Lighting circuits

B) Generator feeder lines

How well did you know this?

Not at all

Perfectly

What devices can provide DC voltage on an aircraft?

A) Only DC generators
B) Batteries and Transformer Rectifier Units (TRU)
C) Only AC generators

B) Batteries and Transformer Rectifier Units (TRU)

How well did you know this?

Not at all

Perfectly

What voltage levels do Transformer Rectifier Units (TRUs) typically provide?

A) 115 Vdc or 230 Vdc
B) 28 Vdc or 14 Vdc
C) 400 Vdc or 28 Vdc

B) 28 Vdc or 14 Vdc

How well did you know this?

Not at all

Perfectly

What is the primary purpose of a Transformer Rectifier Unit (TRU)?

A) To convert DC voltage to AC voltage
B) To transform AC voltage to a lower level and rectify it to DC
C) To increase AC voltage from 28 V to 115 V

B) To transform AC voltage to a lower level and rectify it to DC

How well did you know this?

Not at all

Perfectly

What does a parallel system consist of?

A) One generator connected to multiple buses
B) Two or more generators connected to a common power bus
C) Multiple batteries connected in series

B) Two or more generators connected to a common power bus

How well did you know this?

Not at all

Perfectly

What happens when one generator fails in a system with a Bus Tie Breaker (BTB)?

A) The failed generator supplies both busbars
B) The BTB opens to isolate the busbars
C) The BTB closes, connecting the two busbars to be supplied by the serviceable generator

C) The BTB closes, connecting the two busbars to be supplied by the serviceable generator

How well did you know this?

Not at all

Perfectly

What is one advantage of parallel systems in the event of a generator failure?

A) The defective generator continues to supply power
B) The buses are already connected, allowing isolation of the defective generator
C) The system shuts down completely

B) The buses are already connected, allowing isolation of the defective generator

How well did you know this?

Not at all

Perfectly

What is the minimum duration that emergency electrical power systems on aircraft are designed to provide power?

A) 15 minutes
B) 30 minutes
C) 60 minutes

B) 30 minutes

How well did you know this?

Not at all

Perfectly

What are typical sources of emergency electrical power on an aircraft?

A) Main Battery, Inverters, Auxiliary Power Unit (APU), Ram Air Turbine (RAT)
B) Fuel pumps, hydraulic pumps, and air conditioning units
C) Landing gear, flaps, and spoilers

A) Main Battery, Inverters, Auxiliary Power Unit (APU), Ram Air Turbine (RAT)

How well did you know this?

Not at all

Perfectly

What is one function of the APU on an aircraft?

A) To provide hydraulic power only
B) To start the main engines and provide electrical power during flight if the main engine fails
C) To control the landing gear

Study These Flashcards

B) To start the main engines and provide electrical power during flight if the main engine fails

What is a Ram Air Turbine (RAT) used for on an aircraft?
A) To provide normal electrical power during flight
B) To generate power from the airstream in emergencies
C) To increase aircraft speed

Study These Flashcards

B) To generate power from the airstream in emergencies

When is the Ram Air Turbine (RAT) typically used in modern aircraft? A) During normal flight operations B) Only in an emergency when primary and auxiliary power sources are lost C) To power the cabin lighting system

B) Only in an emergency when primary and auxiliary power sources are lost

What does Faraday’s law state about a conductor in a changing magnetic field? A) It generates a constant voltage regardless of flux change B) An Electromotive Force (EMF) is induced, proportional to the rate of change of magnetic flux C) It loses all electrical resistance

B) An Electromotive Force (EMF) is induced, proportional to the rate of change of magnetic flux

In aircraft DC generators, where are the field windings commonly located? A) Rotor B) Stator C) Brushes

B) Stator

System that produces the electrical energy at the necessary parameters is called? A) Electrical distribution system B) Electrical generation system C) Electrical loading system

B) Electrical generation system

Aircraft battery is generally used to supply what? A) Emergency power - in certain cases and APU starter motor power - for APU start. B) Normal power - during A/C operation C) Galley loads

A) Emergency power - in certain cases and APU starter motor power - for APU start.

The batteries provide: A) 24 VDC B) 115 VAC C) 24 VAC

A) 24 VDC

Which safety precaution needs to be followed while removing batteries? A) Remove positive terminal first B) Remove neutral terminal first C) Remove both terminals together

B) Remove neutral terminal first

What is DC starter Generator? A) A generator that needs a separate starter unit to give electrical power B) A unit in which the same generator can be used as a stater motor C) A unit that has CSD and Generator

B) A unit in which the same generator can be used as a stater motor

What is the purpose of TRU? A) Converts DC to AC B) Converts AC to DC directly C) Steps down AC and then rectify to convert it to DC

C) Steps down AC and then rectify to convert it to DC

Which of the following is parallel AC system? A) Two generators connected to same Bus at a time B) One bus connected to one AC source (generator) at a time C) Two buses connected in parallel to each other

A) Two generators connected to same Bus at a time

What is required is Parallel AC system? A) Synchronisation B) Nothing it is same as Non-Parallel system C) Extra GCU

A) Synchronisation

In a non-parallel system, if one generator fails, how is the affected bus connected with the other side's generator? A) Bus Tie Breaker (BTB) opens to isolate the two buses B) Bus Tie Breaker (BTB) closes to connect the two buses and both are supplied by same generator now C) It cannot be connected to other side's generator

B) Bus Tie Breaker (BTB) closes to connect the two buses and both are supplied by same generator now

What is the advantage of the parallel generator system? A) If one generator fails, it is already connected to other generator B) If one generator fails, Bus Tie Breaker will close to connect to other generator C) If one generator fails, Bus Tie Breaker will open to connect to other generator

A) If one generator fails, it is already connected to other generator

In a rotating armature generator; A) Armature is stationery B) Field is stationery C) Stator is rotating

B) Field is stationery

From where does the generator gets it drive? A) From external parts B) Manually driven by ground staff C) From Engine driven shaft connected to auxiliary gearbox

C) From Engine driven shaft connected to auxiliary gearbox

Which device ensures that generator rotates at constant speed to produce constant 400Hz frequency? A) Engine B) Auxiliary gearbox C) CSD

C) CSD

What is IDG? A) Unit that contains Generator and Auxiliary gearbox as one unit B) Unit that combines Generator and CSD as one unit C) Unit that has Oil tank and Generator as one unit

B) Unit that combines Generator and CSD as one unit

In the lost of main engines and the auxiliary power unit, RAT is deployed to give power to? A) All aircraft systems B) Generators staring C) Flight controls, linked hydraulic and critical aircraft systems

C) Flight controls, linked hydraulic and critical aircraft systems

The EMF produced in a generator is A) Directly proportional to rate of change of magnetic flux B) Inversely proportional to rate of change of magnetic flux C) Not related to rate of change of magnetic flux

A) Directly proportional to rate of change of magnetic flux

In DC generators it is common to have field winding on? A) Stator B) Rotor C) Both stator and rotor

A) Stator

In AC generators it is common to have field winding on? A) Stator B) Rotor C) Both stator and rotor

B) Rotor

Which of the following is more stable voltage regulator? A) Basic regulator using potentiometers B) Vibrating contact type C) Carbon pile type regulator

A) Basic regulator using potentiometers

What is a green circuit breaker? A) Environmentally controlled CB B) CB for essential aircraft systems and connected with CB monitoring system C) Switch type CB

B) CB for essential aircraft systems and connected with CB monitoring system

What is the purpose of smaller pin in AC and DC receptacle? A) To prevent arcing B) To save current C) To save weight

A) To prevent arcing

What are the different types of circuit breakers commonly used in aircraft? A) Push/Pull Pop-out, Toggle Switch, Snap Type B) Push/Pull Pop-out, Push, Switch Type, Thermal C) Switch Type, Snap Type, Push-in/Pull-out

B) Push/Pull Pop-out, Push, Switch Type, Thermal

How long must aircraft batteries last during an emergency? A) 15 minutes B) 30 minutes C) 45 minutes

B) 30 minutes

How can line maintenance personnel ensure a nickel-cadmium battery is fully charged? A) By visually inspecting the battery cells B) By monitoring the voltage and current during charging C) By measuring the battery's weight

B) By monitoring the voltage and current during charging

What is the primary purpose of the Main Power Distribution system on an aircraft? A) To provide electrical power to all main consumers. B) To supply power to systems required to land the aircraft safely. C) To operate the aircraft's essential systems.

A) To provide electrical power to all main consumers.

Which power distribution system ensures that essential systems for the safe operation of the aircraft remain powered? A) Main Power Distribution B) Emergency Power Distribution C) Essential Power Distribution

C) Essential Power Distribution

Which power distribution system supplies the consumers necessary to land the aircraft safely? A) Main Power Distribution B) Essential Power Distribution C) Emergency Power Distribution

C) Emergency Power Distribution

What is an example of a Triple Unit Vibrating Contactor, and is it considered outdated? A) Static Inverter B) Vibrating Voltage Regulator C) Solid-State Voltage Regulator

B) Vibrating Voltage Regulator

11.6 Electrical Power Flashcards

(55 cards)