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ATPL > Electrics PC > Flashcards

Electrics PC Flashcards

1
Q

The current flowing in a circuit is…
Select one:

a. Directly proportional to resistance, indirectly proportional to voltage
b. Directly proportional to temperature, inversely proportional to resistance
c. Inversely proportional to resistance, directly proportional to voltage
d. Inversely proportional to applied voltage, directly proportional to temperature

A

c. Inversely proportional to resistance, directly proportional to voltage

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2
Q

The line voltage of a typical aircraft constant frequency paralleled AC system is ?
Select one:

a. 115
b. 230
c. 400
d. 200

A

d. 200

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3
Q

Heat produces an electric charge when?
Select one:

a. A hard and soft glass is heated
b. Hard and soft material are rubbed together
c. Like poles are joined
d. The junction of two unlike metals is heated

A

d. The junction of two unlike metals is heated

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4
Q

The ratio of true power to apparent power is known as ?
Select one:

a. Ohms
b. The power factor
c. KVAs.
d. The r.m.s value.

A

b. The power factor

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5
Q

Potential difference is measured in ?
Select one:

a. Amps
b. Volts
c. Watts
d. Ohms

A

b. Volts

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6
Q

On aircraft, generator voltage is regulated by…
Select one:

a. Varying the generator field strength
b. Increasing and decreasing the load
c. Changing the generator speed
d. Changing generator load

A

a. Varying the generator field strength

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7
Q

Friction clutches are fitted to actuators for ?
Select one:

a. Protection against mechanical overload
b. Protection against brake on loads
c. Protection against non return valve failure
d. Protection against supply failures

A

a. Protection against mechanical overload

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8
Q

In computer terminology a memory which retains data when power is removed is called ?
Select one:

a. non-volatile
b. volatile
c. RAM
d. ROM

A

a. non-volatile

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9
Q

A trip free circuit breaker is one which:
Select one:

a. Can be by passed
b. Must be held in during checks to find faults.
c. Can be reset by holding the lever in while the fault persist
d. Cannot be reset by holding the lever in while the fault persist

A

d. Cannot be reset by holding the lever in while the fault persist

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10
Q

The purpose of a basic oscillator is to ?
Select one:

a. amplify a signal
b. attenuate a signal
c. produce a sine wave from a DC input
d. increase the frequency of a sine wave

A

produce a sine wave from a DC input

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11
Q

The size of fuse required for an electrical circuit whos power is 72 watts and whose voltage is 24 volts is:
Select one:

a. 15 amps
b. 10 amps
c. 25 amps
d. 5 amps

A

d. 5 amps

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12
Q

If external power is plugged into an aircraft which utilises the split bus system of power distribution, then…
Select one:

a. It will automatically parallel itself with any alternators already online
b. It will only supply non-essential AC consumers
c. It will supply all the aircraft services.
d. essential AC consumers will be supplied from the static inverter.

A

It will supply all the aircraft services

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13
Q

Electromagnetism is a product of ?
Select one:

a. Voltage
b. Current
c. Resistance
d. Engine resistance

A

b. Current

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14
Q

A device for changing AC to DC is ?
Select one:

a. an inverter
b. a rotary transformer
c. a rectifier
d. an alternator

A

c. a rectifier

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15
Q

Two 12V 40 amp/hour batteries connected in series will produce
Select one:

a. 24V 40 amp/hr
b. 24V 80 amp/hr
c. 12V 20 amp/hr
d. 12V 80 amp/hr

A

a. 24V 40 amp/hr

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16
Q

All effects of electricity take place because of the existence of a tiny particle called
the ?
Select one:

a. Electric
b. Proton
c. Neutron
d. Electron

A

d. Electron

17
Q

When a magnet is unable to accept any further magnetism it is termed…
Select one:

a. Active
b. Reactance
c. Saturation
d. Reluctance

A

c. Saturation

18
Q

In normal operation, the split bus bar AC system takes its DC supply from ?

Select one:

a. Two T.R.U s which are always isolated
b. a battery which is supplied from no 1 T.R.U only
c. Two T.R.U s which are connected together by the isolation relay
d. The static inverter

A

Two T.R.U s which are connected together by the isolation relay

19
Q

The voltage regulator…
Select one:

a. Regulates the amount of current supplied by the battery to operate the generator
b. Maintains a steady generator voltage with changes of generator speed
c. Senses current output
d. Provides a constant current flow from the generator with changes of generator speed

A

b. Maintains a steady generator voltage with changes of generator speed

20
Q

The output of an AC generator is taken from ?
Select one:

a. The exciter windings
b. The field coils
c. The stator windings
d. The rotor coils

A

c. The stator windings

ATPL (10 decks)

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