Question: In case the air gap in an induction motor is increased?

• 1. the magnetising current of the rotor will decrease
• 2. the power factor will decrease
• 3. speed of motor will increase
• 4. the windage losses will increase

Question: In an induction motor, no-load the slip is generally____________?

• 1. less than 1%
• 2. 1.5%
• 3. 2%
• 4. 4%

Question: The shaft of an induction motor is made of_____________?

• 1. high speed steel
• 2. stainless steel
• 3. carbon steel
• 4. cast iron

Question: The torque of an induction motor is___________?

• 1. directly proportional to slip
• 2. inversely proportional to slip
• 3. proportional to the square of the slip
• 4. none of the above

Question: The frame of an induction motor is usually made of____________?

• 1. silicon steel
• 2. cast iron
• 3. aluminium
• 4. bronze

Question: The motor used on small lathes is usually_________?

• 1. universal motor
• 2. DC shunt motor
• 3. single-phase capacitor run motor
• 4. 3-phase synchronous motor

Question: A hysteresis motor works on the principle of__________?

• 1. hysteresis loss
• 2. magnetisation of rotor
• 3. eddy current loss
• 4. electromagnetic induction

Question: Which of the following motor will give the highest starting torque ?

• 1. DC shunt motor
• 2. Schrage motor
• 3. Repulsion start and induction run motor
• 4. Universal motor

Question: The power factor of a single-phase induction motor is usually?

• 1. lagging
• 2. always leading
• 3. unity
• 4. unity to 0.8 leading

Question: A shaded pole motor can be used for_____________?

• 1. toys
• 2. hair dryers
• 3. circulators
• 4. any of the above