Electrics Revision Questions

Question 1

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

A. half wave rectifiers
B. quarter wave rectifiers
C. three quarter wave rectifiers
D. full wave bridge rectifiers

Answer 1

D. full wave bridge rectifiers

Question 2

When a generator field breaker (generator field relay switch) 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 2

D. excitation field is disconnected from the voltage regulator

Question 3

Real load in an AC electrical system is expressed as -

A. kW
B. kVA
C. kVAR
D. EMF

Answer 3

A. kW

Question 4

In the event of a failure of the active sources of 115V AC power, the component of the electrical system which supplies DC power is -

A. TRU
B. inverter
C. battery
D. generator

Answer 4

C. battery

Question 5

Batteries may be connected in series in an aircraft system to -

A. increase the total capacity
B. increase the total EMF
C. increase the total resistance
D. avoid frequency matching problems

Answer 5

B. increase the total EMF

Question 6

When a generator breaker trips, the associated generator -

A. is disconnected from its bus
B. is connected to its generators 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 6

A. is disconnected from its bus

Question 7

In a series wound generator, as load increases, output voltage -

A. increases
B. decreases
C. stays constant
D. increases then decreases

Answer 7

A. increases

Question 8

A generator breaker in the electrical system will trip when -

A. field excitation of the generator occurs
B. the generator is out of phase with others on the bus tie
C. the generator develops a fault
D. the load increases

Answer 8

C. the generator develops a fault

Question 9

A trip free circuit breaker is one which -

A. will never trip
B. will not reset when tripped
C. will trip if an overload exists even if the reset button is held in
D. can be overridden to provide current supply and bypass overload protection

Answer 9

C. will trip if an overload exists even if the reset button is held in

Question 10

In an electrical system, diodes would be found in -

A. a rotating inverter
B. a static inverter
C. a TRU
D. a transformer
E. an induction motor

Answer 10

C. a TRU

Question 11

In a split bus electrical system consisting of 2 main engine driven generators -

A. One generator cam supply all buses with no loss of load capacity
B. One bus can have multiple generators connected at once
C. A bus is only supplied by one generator at any given time
D. The generators are normally connected in parallel

Answer 11

C. A bus is only supplied by one generator at any given time

Question 12

A bus bar is -

A. A large terminal for power distribution to services
B. A receiving point of current from the generator or battery
C. A circuit breaker panel
D. Always live

Answer 12

B. A receiving point of current from the generator or battery