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

What operating modes are possible in a shaft generator system (SGS) with semiconductor converters?

A Long-term parallel operation of the shaft generator and diesel generator.

B Motor mode operation of the shaft generator.

C Operation of the shaft generator with variable rotational frequency.

D None of the listed modes.

Питання 2

Specify the allowable frequency difference between the main switchboard busbars and the synchronizing generator:

A 0.5...1.5 Hz.

B 0.5...2.5 Hz.

C 1...5 Hz.

Питання 3

After the thermal protection of the electric motor is triggered, it cannot be restarted immediately because?

A The bimetallic plate must cool down to return to its normal position.

B Each thermal relay has a time delay block that prevents the motor from restarting.

Питання 4

According to SOLAS, how much time is required for the starting and loading of the emergency diesel generator?

A Up to 45 seconds.

B Up to 60 seconds.

C 10-25 seconds.

D Depends on the ship's design.

Питання 5

Which of the following actions should be taken if generator windings overheat?

A Reduce the load and check the cooling system.

B Increase the load on the generator.

C Decrease the generator's rotational frequency.

D Replace the cooling liquid.

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