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DC Generator Vibrating-Type Voltage Regulator Quiz

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30 Questions

What is the purpose of the solenoid in a vibrating-type voltage regulator?

To connect or disconnect the field rheostat based on voltage variations

Why does contact B open when the output voltage rises above a specific value?

To reduce field current

What is the function of the dashpot in a vibrating-type voltage regulator?

To dampen oscillations and prevent hunting

How does contact B influence the field current in the generator?

By increasing the field resistance

Why does contact B close when the output voltage falls below a specific value?

To short the field rheostat

What role does capacitor C play in a vibrating-type voltage regulator?

To help eliminate sparking

What type of regulator is suitable for heavy-duty generator systems?

Carbon-pile voltage regulator

Why can't vibrating-type regulators and three-unit regulators be used with generators that require high field current?

They tend to pit or burn contacts due to large current flow

What is the regulating element in a carbon-pile voltage regulator made of?

Carbon discs

In older aircraft DC generating systems, what type of generators were controlled by carbon-pile voltage regulators?

Compound-wound generators

What keeps the carbon discs pressed together in a carbon-pile voltage regulator?

Leaf springs

What makes the carbon pile in the carbon-pile voltage regulator derive its name?

It contains a stack of carbon discs

What determines when C2 will open?

The amount of load current

Why is it necessary to have a certain minimum value of load current?

To vibrate the current limiter

What would happen if the reverse current cut-out relay was not used in the generator circuit?

The generator would act as a motor

What happens when the cut relay is closed in the DC-generating system?

The line contactor is energized

How does the magnetic field set up by the current flow through the Reverse Current Circuit Breaker (RCCR) affect the breaker contacts?

Keeps them in closed position

How does reducing the output voltage affect the generator current?

Reduces the generator current

What happens to the generator when a reverse current occurs due to a drop in its output during shutdown or failure?

It goes offline

What triggers the action of the voltage regulator?

Battery voltage

What happens when R2 is placed in series with the generator field?

The generated voltage decreases

In what scenario will the reverse current circuit breaker remain closed?

When the current magnitude is much lower than the trigger value

What purpose do the auxiliary contacts of the RCCR serve in the DC-generating system?

Supply the generator shunt field circuit

Why is it essential to de-energize the line contactor during a generator shutdown?

To take the generator offline

What happens when the APU generator is switched on according to the text?

The ground power is disconnected from the bus system.

What is the purpose of an inverter in aircraft systems as mentioned in the text?

To convert a portion of DC power to AC power.

What are the two basic types of inverters mentioned in the text?

Rotary and static inverters.

What is the typical frequency at which inverters in aircraft systems supply current?

$400$ Hz

How is a rotary inverter structured based on the text?

It has a DC motor driving an alternator on the same shaft.

What voltage range is utilized as an input for inverters according to the text?

$26$-$29$ V

Test your knowledge about the functioning and components of a DC generator vibrating-type voltage regulator, including the role of a solenoid and field rheostat in regulating voltage output.

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