200 Important Single Phase Induction Motor MCQ Question & Answer | PDF Free Download
1.A hysteresis motor
- AIs a self-starting motor
- BDoes not need dc excitation
- CDoes not need dc excitation
- DAll of the above
2.In a single-phase hysteresis motor
- AStarting torque is caused by both eddy current and hysteresis while the running torque is caused by hysteresis
- BStarting as well as running torques are caused by both eddy current and hysteresis
- CStarting as well as running torques both are caused by only hysteresis
- DStarting as well as running torques both are caused by only hysteresis
3.A hysteresis motor
- AHas high starting torque due to its high rotor hysteresis loss
- BIs extremely quite in operation due to absence of teeth and winding on rotor
- CAccelerates from rest to full speed almost instantaneously
- DAll of the above
4.Hysteresis motors are used for Hi-Q record player because of them
- AConstant (synchronous) speed
- BExtremely steady torque
- CInsensitivity to supply voltage fluctuations
- DNone dependence on centrifugal switch requirement
5.The main reason for using a hysteresis motor for high quality tape recorders and record players is that
- AIts speed is constant (synchronous)
- BIt develops extremely steady torque
- CIt requires to centrifugal switch
- DIts operations n to affected by mechanical vibrations
6.A ceiling fan uses
- ACapacitor motor
- BCapacitor start capacitor run motor
- CCapacitor start motor
- DUniversal motor
7.Ceiling fan is
- AThree phase IM
- BSingle phase IM
- CSingle phase synchronous motor
- DNone of these
8.The washing machines generally employ
- ASingle phase series motor
- BResistance split phase motor
- CShaded pole motor
- DHysteresis motor
9.The electric motor generally used in household food mixers is
- AUniversal motor
- BShaded pole motor
- CCapacitor start motor
- DNone of the above
10.For toys, the preferred motor is
- AShaded pole motor
- BCapacitor motor
- CReluctance motor
- DUniversal motor
11.Which of the following motors is suitable for timing and control purposes?
- AReluctance motor
- BSeries motor
- CRepulsion motor
- DHysteresis motor
12.In which single-phase motor, the motor has no teeth or winding?
- ASplit phase motor
- BReluctance motor
- CHysteresis motor
- DUniversal motor
13.If a single-phase motor fails to start but gives humming noise this may be due to
- ALow voltage
- BHigh voltage
- CShorted stator winding
- DBlown fuses
14.If a single-phase motor fails to start it may be due to
- ABlown fuses
- BOpen circuit in auxiliary winding
- COpen circuit in main winding
- DAny of the above causes
15.When a ceiling fan using a capacitor run motor is switched on, it hums but does not run. When it is driven by some external means it runs in the direction in which it was made to run. The probable cause is
- AOpen circuited capacitor
- BBlown fuses
- CShort circuited capacitor
- DAny of the above
16.The running winding of a single-phase motor is found cathode on testing. The most probable location of ground fault is at the
- AEnd connection
- BEnd terminals
- CSlot edge where coil enters or comes out of the slot
- DAnywhere on the winding inside a slot
17.Burning out of windings is due to
- AOpen circuited capacitor
- BShort circuited capacitor
- CCapacitor of improper rating
- DNone of the above
18.An open in the centrifugal switch circuit gives an indication of
- AOpen winding
- BShorted winding
- CGrounded winding
- DNone of these
19.Starting or auxiliary winding of a single-phase motor used in a refrigerator is disconnected from the circuit by
- ACentrifugal switch
- BMagnetic relay
- CThermal relay
- DAny of the above
20.Which of the following types of motors are not the induction motors?
- ARepulsion motors
- BSplit phase motors
- CShaded pole motors
- DRepulsion start induction motors