Synchronous Motor MCQ Part 5

Synchronous Motor MCQ Part 5.

Multiple choice questions on Synchronous motor.

What is value of full load slip of synchronous motor

What is value of full load slip of synchronous motor:

  1. 1%
  2. 3%
  3. 8%
  4. 0

Correct answer: 4. 0

The value of full load slip of synchronous motor is 0

Which factor determines the size of synchronous motor

Which factor determines the size of synchronous motor:

  1. kW rating
  2. kVA rating
  3. kVAR rating

Correct answer: 2. kVA rating

The kVA rating of synchronous motor determines its size.

When synchronous motor turns at synchronous speed what is the value of voltage induced in damper winding

When synchronous motor turns at synchronous speed what is the value of voltage induced in damper winding:

  1. Minimum
  2. Half of maximum
  3. Maximum
  4. Zero

Correct answer: 4. Zero

When synchronous motor turn at synchronous speed the value of voltage induced in damper winding is zero

What is the relationship between mechanical power developed by synchronous motor is and stator voltage

The mechanical power developed by synchronous motor is ________________ stator voltage:

  1. Inversely proportional
  2. Directly proportional
  3. Exponentially related
  4. Inversely proportional to square of

Correct answer: 2. Directly proportional

The mechanical power developed by synchronous motor is directly proportional to the stator voltage

Why damper winding is used in synchronous motor

The damper winding is used in synchronous motor for which of the following reason:

  1. For improving efficiency
  2. For improving power factor
  3. For eliminating hunting in motor
  4. None of above

Correct answer: 2. For eliminating hunting in motor

Damper winding or amortisseur winding is used in synchronous motor for eliminating hunting in motor.

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