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Operate Alternators, Generators. Test 9
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Operate Alternators, Generators. Test 9
Operate Alternators, Generators. Test 9
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What are items F indicating in this starting box drawing ?
The fuses.
The front switch.
The front connectors.
The phase terminals.
What are items 'E' in this starting circuit diagram ?
A low voltage relay.
A short-circuit trip.
A reverse current trip.
An overload relay / stop button.
The failure of an AC generator to pick up voltage may be caused by:
The generator's rotating speed is 10% below rated.
Excessive prime mover speed.
A tripped bus circuit breaker.
Failure of the exciter.
How is the power output of an alternator controlled?
By the excitation current in the rotor.
By the resistance bridge in the main switchboard.
By the excitation current in the stator.
By the alternator speed.
What is the function of the voltage regulator fitted to AC generators operating in parallel ?
To cut in generators automatically as they are needed.
To cut out generators not needed because of reduction in load.
To divide the reactive current equally between the generators.
To divide the KVA load equally between all connected generators.
What could item D represent in this electric starting diagram ?
A thermostat.
A pressostat.
Any of the these.
A level switch.
When an electric motor is operated at a higher frequency, it will run _____ and it may be operating _____
slower _____ with too high a current _____
faster _____ in overload.
slower _____ at too high a voltage.
faster _____ at overspeed.
What is the purpose of the preference load tripping system?
To trip the generator before the overload damages the engine.
To disconnect non-essential equipment in case of generator overload.
Disconnect essential equipment before a short circuit can cause damage.
Re-connect essential equipment after a blackout.
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 Megger test.
By carrying out Continuity test (one Ohm range on AVO meter).
By carrying out a Phase balance test.
With large load change what maintains steady voltage?
Automatic voltage regulator.
Automatic voltage regulator & flywheel.
Governor & automatic voltage regulator.
Flywheel & governor.
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