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

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.

Питання 2

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 3

How is the active load distributed between generators operating in parallel?

A Adjustment of the fuel supply to the generator drive engines.

B Adjustment of the excitation of the generators.

C Adjustment of the thyristor opening angle on the generator shaft.

Питання 4

How to check the serviceability of a three-phase electric motor before connection?

A Measure and compare the winding resistance.

B Check for the absence of short circuits to the casing.

C Measure the voltage at the terminals.

D Assess the rotor balancing.

Питання 5

What method is used to improve the power factor of a synchronous motor?

A Adjusting the excitation current.

B Changing the supply frequency.

C Increasing the load.

D Installing harmonic filters.

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