No load and blocked rotor test

Which of the following tests is used to determine the copper losses of an induction motor?

• a) No-load test

• b) Blocked rotor test

• c) Both (a) and (b)

• d) None of the above

Which of the following tests is used to determine the iron losses of an induction motor?

• a) No-load test

• b) Blocked rotor test

• c) Both (a) and (b)

• d) None of the above

Which of the following tests is used to determine the efficiency of an induction motor?

• a) No-load test

• b) Blocked rotor test

• c) Both (a) and (b)

• d) None of the above

Which of the following parameters is calculated from the no-load test of an induction motor?

• a) Stator resistance

• b) Stator reactance

• c) Magnetizing current

• d) None of the above

Which of the following parameters is calculated from the blocked rotor test of an induction motor?

• a) Stator resistance

• b) Stator reactance

• c) Rotor resistance

• d) None of the above

The blocked rotor test of an induction motor is performed to determine:

• a) The core losses

• b) The copper losses

• c) The efficiency

• d) The torque

The slip in an induction motor is defined as:

• a) The difference between the synchronous speed and the rotor speed

• b) The difference between the stator frequency and the rotor frequency

• c) The difference between the rotor resistance and the rotor reactance

• d) None of the above

The efficiency of an induction motor is maximum at:

• a) Full load

• b) Half load

• c) No load

• d) Cannot be determined

The starting torque of an induction motor is:

• a) Zero

• b) Very small

• c) Equal to the full load torque

• d) None of the above

The starting current of an induction motor is:

• a) Very small

• b) Equal to the full load current

• c) Higher than the full load current

• d) None of the above