Induction Motor MCQ Part 2

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Induction Motor MCQ Part 2

Under: Induction Motor MCQ

For higher efficiency of 3 phase induction motor, the slip should be

For higher efficiency of 3 phase induction motor, the slip should be:

  1. Very large
  2. Large
  3. Medium
  4. Small

Correct answer: 4. Small

For higher efficiency of 3 phase induction motor, the slip should be as smaller as possible.

Induction motor is sometimes referred as

Induction motor is sometimes referred as:

  1. Rotating alternator
  2. Rotating transformer
  3. Rotating turbine
  4. None of above

Correct answer: 2. Rotating transformer

The mathematical relationship between synchronous speed, rotor speed, and slip is

The mathematical relationship between synchronous speed, rotor speed, and slip is:

  1. N = (1 – s) Ns
  2. N = (1 + s) Ns
  3. N = s*Ns
  4. N = (2 * s) Ns

Correct answer: 1. N = (1 – s) Ns

At no-load the rotor core loss of a 3 phase induction motor is

At no-load the rotor core loss of a 3 phase induction motor is:

  1. Very large
  2. Large
  3. Small
  4. Practically Zero

Correct answer: 4. Practically zero

In double squirrel cage induction motor, the resistance of outer cage winding is

In double squirrel cage induction motor, the resistance of outer cage winding is:

  1. Low
  2. High

Correct answer: 2. High

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