Revision Questions Electrics

Question 1

In the event of a failure of the active sources of AC power generation in a large jet aircraft, the component of the electrical system which supplies AC power is -

A. The TRU
B. The transistor
C. The static inverter
D. The generator

Answer 1

C. The static inverter

Question 2

The type of rectifiers normally used in large aircraft AC generators to provide DC for field excitation of the main generator are -

A. Half wave
B. Quarter wave
C. Three quarter wave
D. Full wave bridge

Answer 2

D. Full wave bridge

Question 3

When a generator breaker (generator field relay) trips, the associated generator -

A. Is disconnected from its CSD
B. Is connected to its generator bus
C. Is provided with initial field excitation from its bus
D. Excitation field is disconnected from the voltage regulator
E. Excitation field is disconnected from its bus

Answer 3

D. Excitation field is disconnected from the voltage regulator

Question 4

The circumstance which would prevent the connection of ground AC power to the electrical system of a large jet transport category aircraft is -

A. An engine running
B. APU running
C. A generator connected to its bus
D. An improper earth point of the GPU

Answer 4

C. A generator connected to its bus

Question 5

The component of an electrical system in which diodes would be found is a -

A. Bus bar
B. Battery
C. Inverter
D. Rectifier

Answer 5

D. Rectifier

Question 6

The function of a static inverter in an aircraft electrical system is to -

A. Convert AC to DC at a lower voltage
B. Convert AC to DC at a higher voltage 
C. Convert AC to DC at a constant voltage 
D. Convert DC to AC at a lower voltage 
E. Convert DC to AC at a higher voltage

Answer 6

E. Convert DC to AC at a higher voltage

Question 7

When a generator breaker trips, the associated generator -

A. Is disconnected from its bus
B. Is connected to its generator bus
C. Is provided with initial field excitation from its bus
D. Excitation field is disconnected from the voltage regulator
E. Excitation field is disconnected from its bus

Answer 7

A. Is disconnected from its bus

Question 8

The KW meter in an aircraft electrical system measures -

A. Total load
B. Real load
C. Total EMF
D. Total voltage

Answer 8

B. Real load

Question 9

Batteries in a large aircraft are usually connected in parallel to -

A. Increase the voltage at constant amps
B. Increase the amps at constant voltage
C. Increase the amps and the EMF
D. Decrease the voltage and increase the amps

Answer 9

B. Increase the amps at constant voltage

Question 10

In an electrical system, diodes would be found in -

A. A rotating inverter
B. A static inverter 
C. A transformer rectifier unit
D. A transformer
E. An induction motor

Answer 10

C. A transformer rectifier unit

Question 11

The function of a static inverter in a constant frequency AC power generating system in a large jet transport aircraft is -

A. Provide 115VAC 400Hz power in the event of a total generator failure
B. Provide 28VAC 400 Hz power to selected instruments under normal conditions
Provide 115VAC 400Hz power to selected instruments under normal conditions

Answer 11

A. Provide 115VAC 400Hz power in the event of a total generator failure

Question 12

A generator in an aircraft electrical system is connected to a synchronising bus via the -

A. Bus tie breaker
B. Split system breaker
C. Field relay switch
D. Generator control breaker

Answer 12

A. Bus tie breaker

Question 13

With regard to jet transport electrical systems -

A. With a split bus the generators are always paralleled
B. With a parallel bus system the generators are paralleled
C. With a split bus system the generators are connected in series
D. With a parallel bus system the generators are connected in series

Answer 13

B. With a parallel bus system the generators are paralleled