Electrics PC

Question 1

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

Answer 1

c. Inversely proportional to resistance, directly proportional to voltage

Question 2

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

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

Answer 2

d. 200

Question 3

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

Answer 3

d. The junction of two unlike metals is heated

Question 4

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.

Answer 4

b. The power factor

Question 5

Potential difference is measured in ?
Select one:

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

Answer 5

b. Volts

Question 6

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

Answer 6

a. Varying the generator field strength

Question 7

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

Answer 7

a. Protection against mechanical overload

Question 8

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

Answer 8

a. non-volatile

Question 9

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

Answer 9

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

Question 10

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

Answer 10

produce a sine wave from a DC input

Question 11

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

Answer 11

d. 5 amps

Question 12

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.

Answer 12

It will supply all the aircraft services

Question 13

Electromagnetism is a product of ?
Select one:

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

Answer 13

b. Current

Question 14

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

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

Answer 14

c. a rectifier

Question 15

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

Answer 15

a. 24V 40 amp/hr

Question 16

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

Answer 16

d. Electron

Question 17

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

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

Answer 17

c. Saturation

Question 18

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

Answer 18

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

Question 19

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

Answer 19

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

Question 20

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

Answer 20

c. The stator windings