Marine Electrotechnology. Test 3

A 450 volt, 859 kW rated generator has not been in operation for several weeks. Prior to starting, insulation resistance readings are taken. The minimum acceptable insulation resistance reading on the main stator winding to allow you to proceed with running the generator is:

For two generators running in parallel, their share of additional load (kW) will be determined by the:

The internal e.m.f. generated in the phase windings of an a.c. generator is controlled by:

A 450 volt 3 phase brushless alternator will have the following combination of items mounted on the rotor:

For ideal synchronising, the phase angle difference between the incomer e.m.f. and the busbar voltage should be:

Prior to synchronising, the generator voltage and frequency are respectively controlled by:

The correct time to synchronise is usually taken to be when the synchroscope reaches the '5 to 12' position. This to allow for:

A transformer with 10:1 turns ratio and rated 50 kVA, 2400/240 Volts, 60 Hz, is used to step down the voltage to a distribution system. The low tension voltage is to be kept constant at 240 Volts. What load impedance connected to the low-tension side will cause the transformer to be fully loaded?

Unloading a generator, it is necessary to gradually decrease the load in order to avoid:

Regular (at least weekly) testing of the emergency generator must be performed to check: