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 does a slip of one mean when an induction motor with a squirrel-cage rotor is operating?

A The rotor is stationary.

B The rotor rotates at the same frequency as the stator's magnetic field.

C The rotor rotates at a frequency different from the stator's magnetic field.

Питання 2

How will the efficiency of a transformer change when the load decreases?

A It will decrease because the relative no-load losses will increase.

B It will increase because the losses will decrease.

C It will remain unchanged.

D It will depend on the winding temperature.

Питання 3

What signs indicate that a transformer needs maintenance or replacement?

A Increased humming and heating.

B Change in the output signal frequency.

C Open circuit in the secondary winding.

D Reduced output voltage without load.

Питання 4

How will the output voltage of a transformer change when the supply voltage frequency increases?

A It will increase because the inductive reactance of the winding will decrease.

B It will decrease because losses in the windings will increase.

C It will remain unchanged.

D It will depend on the load.

Питання 5

What could cause a false triggering of overload protection in an electric drive control circuit?

A High ambient temperature and incorrect relay protection settings.

B Motor bearing wear.

C Low supply voltage.

D Change in network frequency.

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