Electro-Technical Competence

Electrical Motors

This test covers the fundamentals of marine electrical motors, their classification, control principles, and fault diagnostics. It includes questions on operation, starting systems, protection, and maintenance of electrical motors in maritime environments.

Питань 15

Час 9 min

Мова Англійська

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Питання 1

When dismantling the bearing of an electric machine, the force should be applied to?

A The inner ring of the bearing.

B The outer ring of the bearing.

C Both the inner and outer rings of the bearing.

Питання 2

In practice, when manually synchronizing a generator for parallel operation, its frequency is set slightly higher than the network frequency on the busbars. This is done in order to?

A Ensure that the incoming generator takes on active load immediately after being connected to the main switchboard busbars.

B Test the operation of the reverse power relay.

C Prevent the running generator from switching to motor mode.

D Avoid a sudden surge of balancing currents.

Питання 3

Can a transformer designed to convert 220V to 110V be used to convert 440V to 220V?

A No, because core magnetic saturation will be exceeded, leading to overheating and failure.

B Yes, if it is rated for such power.

C Yes, if the supply voltage frequency is reduced.

D Yes, if the output load is reduced.

Питання 4

How will the output voltage of a generator with an automatic voltage regulator behave if a powerful consumer is disconnected?

A It will remain practically at the same level due to the operation of the automatic voltage regulator.

B The voltage will rise and then slowly drop to the nominal value.

C It will remain practically at the same level due to the operation of the drive engine speed regulator.

D The voltage will drop and then slowly rise to the nominal value.

Питання 5

Which protection disconnects one of the two parallel-running generator sets in case of fuel/steam supply failure?

A Reverse power protection.

B Fuel/steam pressure protection.

C Low-frequency protection.

D Low-voltage protection.

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