[amp_mcq option1=”d.c. series motor” option2=”shaded pole motor” option3=”capacitor-start capacitor-run motor” option4=”reluctance motor” correct=”option3″]
Single phase induction motors
2. The speed control of universal motor used for sewing machines is by
[amp_mcq option1=”friction” option2=”varying the resistance” option3=”tapping the field” option4=”centrifugal mechanism” correct=”option2″]
Detailed SolutionThe speed control of universal motor used for sewing machines is by
3. The running winding of a single phase motor on testing with Meggar is found to be ground. Most probable location of the ground will be
[amp_mcq option1=”At the end connections” option2=”At the end terminals” option3=”Anywhere on the winding inside a slot” option4=”At the slot edge where coil enters or comes out of the slot” correct=”option4″]
4. In split-phase motor auxiliary winding is of
[amp_mcq option1=”thick wire placed at the bottom of the slots” option2=”thick wire placed at the top of the slots” option3=”thin wire placed at the top of the slots” option4=”thin wire placed at the bottom of the slots” correct=”option1″]
Detailed SolutionIn split-phase motor auxiliary winding is of
5. In a single phase motor the centrifugal switch
[amp_mcq option1=”disconnects auxiliary winding of the motor” option2=”disconnects main winding of the motor” option3=”reconnects the main winding the motor” option4=”reconnects the auxiliary winding of the motor” correct=”option1″]
Detailed SolutionIn a single phase motor the centrifugal switch
6. A repulsion motor is equipped with
[amp_mcq option1=”slip rings” option2=”commutator” option3=”both (A) and (B)” option4=”none of the above” correct=”option1″]
7. A schrage motor can run on
[amp_mcq option1=”zero slip” option2=”negative slip” option3=”positive slip” option4=”all of the above” correct=”option3″]
8. The speed of a universal motor is usually reduced by using
[amp_mcq option1=”gearing” option2=”belts” option3=”brakes” option4=”chains” correct=”option1″]
Detailed SolutionThe speed of a universal motor is usually reduced by using
9. If a D.C. series motor is operated on
[amp_mcq option1=”spark excessively” option2=”have poor efficiency” option3=”series motor is operated on A.C. supply, it will A. spark excessively B. have poor efficiency C. have poor power factor” option4=”all of the above” correct=”option4″]
10. Single phase induction motor usually operates on
[amp_mcq option1=”0.6 power factor lagging” option2=”0.8 power factor lagging” option3=”0.8 power factor leading” option4=”unity power factor” correct=”option1″]
Detailed SolutionSingle phase induction motor usually operates on