Armature
Field
Rotor
Stator
Answer is Right!
Answer is Wrong!
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
Armature winding
Field winding
Either armature winding or field winding
None of the above
Answer is Right!
Answer is Wrong!
23. Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed
30 to 40
70 to 80
80 to 90
100
Answer is Right!
Answer is Wrong!
24. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
improve power factor
increase overload capacity
reduce fluctuations in torque
to improve torque
Answer is Right!
Answer is Wrong!
25. In a capacitor start motor, the phase displacement between starting and running winding can be nearly
10°
30°
60°
90°
Answer is Right!
Answer is Wrong!
26. The wattage of motor for driving domestic sewing machine will be around
100 to 150 W
40 to 75 W
10 to 30 W
5 to 10 W
Answer is Right!
Answer is Wrong!
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 ?
Shaped pole motor
Split phase motor
Capacitor start motor
Capacitor run motor
Answer is Right!
Answer is Wrong!
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
running winding only
starting winding only
either (A) or (B)
both (A) and (B)
Answer is Right!
Answer is Wrong!
29. The shaded pole motor is used for
high starting torque
low starting torque
medium starting torque
very high starting torque
Answer is Right!
Answer is Wrong!
30. A universal motor is one which
can be operated either on D.C. or A.C. supply at approximately the same speed and output
can be marketed internationally
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
none of the above
Answer is Right!
Answer is Wrong!