11.6 Flashcards
In a constant frequency AC system, reactive load sharing is achieved by regulating the
Voltage regulator
In a constant frequency AC system, real load sharing is achieved by regulating the
Generator drive torque
What happens if frequency decreases without alternating the physical length of the aerial?
The aerial becomes capacitively reactive
What happens if frequency increases without alternating the physical length of aerial?
The aerial becomes inductively reactive
DC shunt generator without a voltage regulator, if the load increases the generator output voltage will?
Decrease
The output from an AC generator is taken from?
Connections on the stator
Differential sensing coil senses?
Current
What happens when you shut down the engine?
Under-frequency and under-volts
The winding embedded in the pole face of a DC generator are?
Compensating windings
How are Auxiliary windings wound on a DC generator?
Wound on top on the inter pole windings
A vibrating contact voltage regulator has?
A. A resister in series with the points
B. A resister in parallel with the points
C. A volts coil in parallel with the points
B. A resister in parallel with the points
A vibrating contact voltage regulator consists of a shunt winding and?
A voltage regulating coil in series
A vibrating type voltage regulator regulates field current by?
A resistor in parallel with a pair of contact breaker points
A voltage regulator installed in series with a generator field uses?
A voltage coil in parallel with the generator output
AC generator output indications are measured in?
KW & KVAR
An alkaline battery must have its electrolyte level adjusted when?
On completion of charge
A SG check on a battery should be carried out when?
3 hours after flight
Battery capacity is checked by?
Discharging at a constant current and checking the time taken to reach the discharged state
Galley loads are supplied from where?
The main bus bar
Increasing the real load primarily?
Decreases frequency
Lead acid batteries when removed from service must be stored?
Fully charged
Nickel cadmium batteries may be topped up with diluted or de-mineralised water when?
The battery is fully charged
On a C.S driven generator, the operation of the disconnect solenoid will disconnect the generator drive, how is it reset?
Resetting can only be carried out on the ground
On a split bus electrical system, during normal operation, the bus tie breakers are?
Always open in flight
How is open phase sensing detected on a current transformer?
Detected on generator neutral circuit
Over-voltage condition trips the generator. the time taken to trip the GCU depends on?
Amplitude of voltage
Polarisation in a cell is?
The fact that hydrogen bubbles form on the -ve plate
The current consumed by a DC starter motor will?
Decrease as the engine speed increases
The electrolyte in a lead acid battery contains?
Sulphuric acid
The electrolyte of a nickel-cadmium battery is the lowest when the battery is?
In a discharged condition
The method used to rapidly charge a nickel-cadmium battery utilises?
Constant voltage and varying current
The output from an AC generator is taken from?
Connections on the stator
The preferred method of battery charging in a Ni-Cad battery is constant?
Current
The purpose of a thermistor in a brushless AC generator is to?
Keep the exciter field resistance nearly constant at varying temperatures
The SG of the electrolyte in a ni-cad battery on discharge?
Remains the same
The small pins in the power connector plug are?
Positive
The state of charge of a nickel cadmium battery. Can be accurately determined in a workshop by?
The time required to discharge
To confirm the state of charge of a ni-cad battery?
Measure the discharge time
To obtain DC from a generator, the armature windings are connected to?
A commutator
To parallel an alternating current generator it’s one or more generators, phase A must be?
In phase with other generators and ABC
To restore electrolyte after spillage?
Add a mixture of acid and water of same sg as that in the battery
To restore the level of electrolyte which has been lost due to normal gassing during battery charging
Distilled water must be added
Vibrating contact voltage regulator sensing coil is
in parallel with the field windings
What would be the cause of a low electrolyte level in a in a nicad battery?
Over charging current
When a ni-cad battery is fully charged?
The electrolyte level is higher level than normal
When connecting aircraft batteries, the last lead to connect is the?
Negative
Wires in hot temperature areas should be bound with?
Teflon
Which generator has commutators?
DC
Which generators have slip rings?
AC
The trimmer resister in a carbon pile volts regulator is…..
In series with the generator volts coil
The function of the voltage regulator in the GCU is to control the voltage at?
The point of regulation to 115v by influencing the exciter current
When temperature of the electrolyte in a battery increases, the SG
Goes down
When the temperature increases in a lead acid battery, the SG will?
Decrease
Vibrating contact voltage regulator sensing coil is?
In parallel with the field windings
