Single phase induction motors Archives

11. Which motor is normally free from mechanical and magnetic vibrations ?

Split phase motor

Universal motor

Hysteresis motor

Shaded pole motor

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12. Which of the following motors is inherently self starting ?

Split motor

Shaded-pole motor

Reluctance motor

None of these

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13. In case of high speed universal motor which of the following needs more attention ?

End play

Air gap

Insulation in rotor

Balancing of rotor

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class="screen-reader-text">In case of high speed universal motor which of the following needs more attention ?

14. When a D.C. series motor is connected to

high inductance of field and armature circuits

induced current in rotor due to variations of flux

series motor is connected to A.C. supply, the power factor will be low because of A. high inductance of field and armature circuits B. induced current in rotor due to variations of flux C. fine copper wire winding

none of the above

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a D.C. series motor is connected to" class="read-more button" href="https://exam.pscnotes.com/mcq/when-a-d-c-series-motor-is-connected-to/#more-49517">Detailed Solution

15. A universal motor can run on

D.C. only

only B.

none of the above

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512"> Subscribe on YouTube button" href="https://exam.pscnotes.com/mcq/a-universal-motor-can-run-on/#more-49503">Detailed Solution

16. In repulsion motor, maximum torque is developed when

brush axis is at 45Â° electrical to the field axis

brush axis coincides with the field axis

brush axis is at 90Â° electrical to the field axis

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17. The wattage rating for a ceiling fan motor will be in the range

200 to 250 W

250 to 500 W

50 to 150 W

10 to 20 W

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18. Which of the following motor will give the highest starting torque ?

D.C. shunt motor

Schrage motor

shunt motor B. Schrage motor C. Repulsion start and induction run motor

Universal motor

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following motor will give the highest starting torque ?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-motor-will-give-the-highest-starting-torque/#more-48615">Detailed Solution