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
Which of the following load normally needs starting torque more than the rated torque?
A Blowers
B Conveyors
C Air compressors
D Centrifugal pumps
The ratio of starting torque to running torque in a synchronous motor is
A zero
B one
C two
D infinity
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
For the same H.P. rating and full load speed, following motor has poor starting torque
A Shunt
B Series
C Differentially compounded
D Cumulatively compounded
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
A Frame
B Shaft
C Commutator
D Stator
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
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
________ 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
Which of the following motor will give relatively high starting torque ?
A Capacitor start motor
B Capacitor run motor
C Split phase motor
D Shaded pole motor

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