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

A generator operates based on the principle of electromagnetic induction. The generated EMF is controlled by?

A The rotational speed of the drive engine and the excitation current.

B The internal voltage drop and the load current.

C The rotational speed of the drive engine, magnetism, and the load current.

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

What are the methods of starting an electric motor?

A Direct start.

B Star-Delta start.

C Autotransformer start.

D Frequency start.

E Reverse start (plugging).

F Delta-Star start.

Питання 4

What is the main sign indicating bearing failure in an induction motor?

A Increased vibration and noise.

B Rise in winding temperature.

C Increase in insulation resistance.

D Decrease in power consumption.

Питання 5

To which winding of a brushless synchronous generator is the voltage regulator typically connected?

A To the excitation winding of the exciter.

B To the excitation winding of the generator.

C To the stator winding of the exciter.

D To the stator winding of the generator.

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