Single phase induction motor objective questions Phase-3

Q1:- Where or how is the performance data of a motor found?

1. In NEMA Standards
2. By taking electrical measurements
3. By Calculation
4. On the motor's nameplates

ANSWER:-4

Q2:- Which of the following is characteristics of a single phase motor ?

1. It is not self starting 
2. It is self starting
3. It requires only one winding
4. It can rotate in one direction ony

ANSWER:-1

Q3:- A rotating magnetic field is produced by the current in the two winding displaced by 90 electrical degrees. This is the principle of 

1. Phase timing 
2. Phase spliting
3. Phase sequence
4. Phase relationship

ANSWER:-2

Q4:- The speed of the rotating magnetic field in an induction motor is known as the 

1. Slip speed
2. Effective speed
3. Shaft speed
4. Synchronous Speed

ANSWER:-4

Q5:- After the starting winding is disconnected from the circuit, the motor continues to run only on the

1. Squirrel cage winding
2. Running winding
3. Magnetic winding
4. Compensating winding

ANSWER:-2

Q6:- most fractional horsepower motors have what type of bearing

1. Pain or sleeve bearings
2. Ball or roller bearings
3. Hard and annealed bearings
4. Soft and porous bearings

ANSWER:-1

Q7:- A single phase motor is made self starting by the addition of a/an

1. Running winding
2. Starting winding
3. Electric starter
4. Autotransformer

ANSWER:-2

Q:-8 A split phase motor is started by connecting both the running winding and starting winding across the line in

1. Parallel 
2. Series
3. Series-Parallel
4. an inductive coupling

ANSWER:-1

Q9:- If the rotor of a 3-phase induction motor is assumed purely resistive, then electromagnetic torque is

1. Minimum with load angle of 90 degree
2. Minimum with load angle of 90 degree
3. Optimum  with load angle of 90 degree
4. Optimum with oad angle of 0 degree

ANSWER:-1

Q10:- If the starting winding is left in the circuit it wil cause the motor to 

1. Run faster
2. Run sower
3. Draw excessive current and overheat
4. stall on right load

ANSWER:-3