Related Questions

Which of the following motors has highest starting torque ?
A Repulsion motor
B Shaped pole motor
C Capacitor-start motor
D Split-phase 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
________ 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
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
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 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 one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
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
In case of the induction motors the torque is
A Inversely proportional to $$\left( {\sqrt {{\text{slip}}} } \right)$$
B Directly proportional to $${\left( {{\text{slip}}} \right)^2}$$
C Inversely proportional to slip
D Directly proportional to slip

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