Single phase induction motors

[amp_mcq option1=”improves the efficiency” option2=”helps the rotor teeth to remain under the stator teeth” option3=”helps in reducing the tendency of the rotor teeth to remain under the stator teeth” option4=”improves the power factor” correct=”option2″]

Detailed SolutionThe rotor slots, in an induction motor, are usually not quite parallel to the shaft because it

[amp_mcq option1=”Reluctance motor” option2=”Series motor” option3=”Repulsion motor” option4=”Universal motor” correct=”option1″]

Detailed SolutionWhich of the following single-phase motors is suitable for timing and control purposes ?

[amp_mcq option1=”universal motor” option2=”D.” option3=”shunt motor C. single-phase capacitor run motor” option4=”3-phase synchronous motor” correct=”option1″]

Detailed SolutionThe motor used on small lathes is usually

[amp_mcq option1=”Repulsion motor” option2=”Repulsion induction motor” option3=”Repulsion start induction run motor” option4=”None of the above” correct=”option1″]

Detailed SolutionWhich of the following motors has two separate windings on the motor ?

[amp_mcq option1=”fans” option2=”blowers” option3=”sound equipment” option4=”mixer grinders” correct=”option1″]

Detailed SolutionAs hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for

[amp_mcq option1=”Hysteresis motor” option2=”Schrage motor” option3=”Universal motor” option4=”Reluctance motor” correct=”option1″]

Detailed SolutionWhich of the following motors is used for unity power factor ?

[amp_mcq option1=”a single turn of heavy wire which is in parallel with running winding” option2=”a single turn of heavy copper wire which is short-circuited and carries only induced current” option3=”a multilayer fine gauge copper wire in parallel with running winding” option4=”none of the above” correct=”option2″]

Detailed SolutionIn a shaded pole motor, the shading coil usually consist of

[amp_mcq option1=”brush axis is 45° electrical to field axis” option2=”brush axis coincides with the field axis” option3=”brush axis is 90° electrical to field axis” option4=”both (B) and (C)” correct=”option3″]

Detailed SolutionIn repulsion motor, zero torque is developed when

[amp_mcq option1=”It requires only one winding” option2=”It can rotate in one direction only” option3=”It is self-starting” option4=”It is not self-starting” correct=”option1″]

Detailed SolutionWhich of the following statements regarding single-phase induction motoris correct ?

[amp_mcq option1=”pulsating” option2=”uniform” option3=”none of the above” option4=”nil” correct=”option1″]

Detailed SolutionTorque developed by a single phase induction motor at starting is