[amp_mcq option1=”Armature” option2=”Field” option3=”Rotor” option4=”Stator” correct=”option4″]
Detailed SolutionThe starting winding of a single-phase motor is placed in
Single phase induction motors
22. The direction of rotation of universal motor can be reversed the by reversing the flow of current through
[amp_mcq option1=”Armature winding” option2=”Field winding” option3=”Either armature winding or field winding” option4=”None of the above” correct=”option3″]
23. Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed
[amp_mcq option1=”30 to 40″ option2=”70 to 80″ option3=”80 to 90″ option4=”100″ correct=”option3″]
24. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
[amp_mcq option1=”improve power factor” option2=”increase overload capacity” option3=”reduce fluctuations in torque” option4=”to improve torque” correct=”option4″]
25. In a capacitor start motor, the phase displacement between starting and running winding can be nearly
[amp_mcq option1=”10°” option2=”30°” option3=”60°” option4=”90°” correct=”option4″]
26. The wattage of motor for driving domestic sewing machine will be around
[amp_mcq option1=”100 to 150 W” option2=”40 to 75 W” option3=”10 to 30 W” option4=”5 to 10 W” correct=”option1″]
Detailed SolutionThe wattage of motor for driving domestic sewing machine will be around
27. Which of the following motors will operate at high power factor ?
[amp_mcq option1=”Shaped pole motor” option2=”Split phase motor” option3=”Capacitor start motor” option4=”Capacitor run motor” correct=”option4″]
Detailed SolutionWhich of the following motors will operate at high power factor ?
28. Direction of rotation of a split phase motor can be reversed by reversing the connection of
[amp_mcq option1=”running winding only” option2=”starting winding only” option3=”either (A) or (B)” option4=”both (A) and (B)” correct=”option3″]
29. The shaded pole motor is used for
[amp_mcq option1=”high starting torque” option2=”low starting torque” option3=”medium starting torque” option4=”very high starting torque” correct=”option2″]
30. A universal motor is one which
[amp_mcq option1=”can be operated either on D.C. or A.C. supply at approximately the same speed and output” option2=”can be marketed internationally” option3=”or A.C. supply at approximately the same speed and output B. can be marketed internationally C. runs at dangerously high speed on no-load” option4=”none of the above” correct=”option1″]