Related Questions

While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
________ has the least value of starting torque to full load torque ratio.
A D.C. shunt motor
B D.C. series motor
C Squirrel cage induction motor
D Slip ring induction motor
The ratio of starting torque to full-load torque is least in case of
A Series motors
B Shunt motors
C Compound motors
D None of the above
The ratio of starting torque to running torque in a synchronous motor is
A zero
B one
C two
D infinity
Which of the following load normally needs starting torque more than the rated torque?
A Blowers
B Conveyors
C Air compressors
D Centrifugal pumps
Determine power rating of an electric motor if it runs at 1440 rpm and line shaft transmits torque of 75 Nm. Assume Reduction ratio =1.6
A 10.36 kW
B 11.3 kW
C 7.068kW
D 9.12kW
Following motor is used where high starting torque and wide speed range control is required.
A Single phase capacitor start
B Induction motor
C Synchronous motor
D D.C. motor
If a particular application needs high speed and high starting torque, then which of the following motor will bepreferred ?
A Universal motor
B Shaded pole type motor
C Capacitor start motor
D Capacitor start and run motor
Which of the following single-phase motors has relatively poor starting torque ?
A Universal motor
B Repulsion motor
C Capacitor motor
D All single phase motors have zero starting torque
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
A Remain unchanged
B Reduce to one-fourth value
C Increase four folds
D Be doubled

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