Related Questions

In an actual transformer the iron loss remains practically constant from noload to fullload because
A value of transformation ratio remains constant
B permeability of transformer core remains constant
C core flux remains practically constant
D primary voltage remains constant
________ 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 running torque in a synchronous motor is
A zero
B one
C two
D infinity
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 starting torque in case of centrifugal pumps is generally
A Less than running torque
B Same as running torque
C Slightly more than running torque
D Double the running torque
The maximum torque multiplication ratio in a torque converter is about
A 2.5
B 10
C 25
D 40
The Procedure for starting or re-starting a computer is called-
A Warm Boot
B cold Boot
C Booting
D Loading of Windows
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they gain meet at the starting point altogether?
A 26 minutes and 18 seconds
B 42 minutes and 36 seconds
C 45 minutes and 38 seconds
D 46 minutes and 12 seconds
The starting torque of a three phase induction motor can be increased by
A Increasing slip
B Increasing current
C Both (A) and (B)
D None of the above

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