Induction Motor MCQs Part 9

Induction Motor MCQs Part 9

A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor

A 3-phase delta connected induction motor is carrying too heavy load and one of its fuses blows out. Afterwards the motor:

1. Will stop and carry heavy current causing permanent damage to its winding
2. Will continue running with one burning phase
3. Will continue running without any harm to the winding
4. Will continue running burning its two phase

Correct answer: 1. Will stop and carry heavy current causing permanent damage to its winding

A squirrel cage induction motor is not selected for which of the following case

A squirrel cage induction motor is not selected for which of the following case:

1. Maintenance cost is to be kept low
2. Initial cost is the main consideration
3. Higher starting torque is the main consideration
4. All above considerations are involved

Correct answer: 3. Higher starting torque is the main consideration

Circle diagram for an induction motor cannot be used to find

Circle diagram for an induction motor cannot be used to find:

1. Power factor
2. Efficiency
3. Output
4. Frequency

Correct answer: 2. Efficiency

Good power factor of an induction motor can be achieved if the average flux density in the air gap is

Good power factor of an induction motor can be achieved if the average flux density in the air gap is:

1. Large
2. Absent
3. Infinity
4. Small

Correct answer: 4. Small

If the relative speed between the rotating flux of stator and rotor of the induction motor is zero

If the relative speed between the rotating flux of stator and rotor of the induction motor is zero:

1. The torque produced will be very large
2. The rotor will run at very high speed
3. The rotor will not run
4. The slip of the motor will be 5%

Correct answer: 3. The rotor will not run