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Operate Alternators, Generators. Test 9

Online Maritime Tests > Tests > Operate Alternators, Generators. Test 9

Operate Alternators, Generators. Test 9

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With large load change what maintains steady voltage?

Automatic voltage regulator.
Automatic voltage regulator & flywheel.
Governor & automatic voltage regulator.
Flywheel & governor.

What could item D represent in this electric starting diagram ?

Question Image

A thermostat.
Any of the these.
A pressostat.
A level switch.

When an electric motor is operated at a higher frequency, it will run _____ and it may be operating _____

faster _____ at overspeed.
faster _____ in overload.
slower _____ at too high a voltage.
slower _____ with too high a current _____

The failure of an AC generator to pick up voltage may be caused by:

Failure of the exciter.
Excessive prime mover speed.
A tripped bus circuit breaker.
The generator's rotating speed is 10% below rated.

How is the power output of an alternator controlled?

By the excitation current in the stator.
By the alternator speed.
By the resistance bridge in the main switchboard.
By the excitation current in the rotor.

What is the purpose of the preference load tripping system?

To disconnect non-essential equipment in case of generator overload.
Disconnect essential equipment before a short circuit can cause damage.
To trip the generator before the overload damages the engine.
Re-connect essential equipment after a blackout.

What are items F indicating in this starting box drawing ?

Question Image

The front connectors.
The fuses.
The front switch.
The phase terminals.

What is the function of the voltage regulator fitted to AC generators operating in parallel ?

To divide the reactive current equally between the generators.
To cut out generators not needed because of reduction in load.
To cut in generators automatically as they are needed.
To divide the KVA load equally between all connected generators.

How will you find out if an electric motor has developed an earth fault?

By carrying out a Drop test (mini-volt test).
By carrying out a Phase balance test.
By carrying out a Megger test.
By carrying out Continuity test (one Ohm range on AVO meter).

What are items 'E' in this starting circuit diagram ?

Question Image

An overload relay / stop button.
A short-circuit trip.
A low voltage relay.
A reverse current trip.

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Operate Alternators, Generators. Test 9

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