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

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 2

What does slip characterize in the operation of an induction motor with a squirrel-cage rotor?

A The lag of the rotor behind the rotating stator field.

B The ratio of the torque on the rotor to the speed of the stator field.

C The value of the rotor current relative to the stator current.

D The degree of rotor slippage in the bearing when it is worn out.

Питання 3

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.

Питання 4

What is a "short-circuited turn"?

A A turn installed across the magnetic core and closed on itself.

B A zone on the inductive coil where a short circuit has occurred.

C A term sometimes used to refer to a current transformer.

D A magnetic core closed on itself.

Питання 5

For what reason will the generator circuit breaker trip in the event of a short circuit between phases in the generator windings?

A Undervoltage protection will activate.

B Overcurrent protection will activate.

C Reverse power protection will activate.

D Low-frequency protection will activate.

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