Star-delta starting of motors is not possible in case of? Mark as favorite Copy Link single phase motors variable speed motors low horse power motors high speed motors Check Answer
Short-circuit test on an induction motor cannot be used to determine? Mark as favorite Copy Link windage losses copper losses transformation ratio power scale of circle diagram Check Answer
The shape of the torque/slip curve of Induction motor is? Mark as favorite Copy Link parabola hyperbola rectangular parabola straight line Check Answer
slip ring motor is preferred over squirrel cage induction motor where? Mark as favorite Copy Link high starting torque is required load torque is heavy heavy pull out torque is required all of the above Check Answer
When a double squirrel cage motor is started, the current induced in the rotor? Mark as favorite Copy Link flows mostly through the upper winding flows mostly through the lower winding is directly proportional to the impedance offered by each cage is equally divided between the two windings Check Answer
In an induction motor the pulsation losses and noise can be reduced by using? Mark as favorite Copy Link large number of semi-open slots large number of narrow slots less number of narrow slots all of the above Check Answer
The frame of an induction motor is made of? Mark as favorite Copy Link carbon Closed grained cast iron aluminium stainless steel Check Answer
What is the advantage of the double squirrel-cage rotor as compared to the round bar cage rotor? Mark as favorite Copy Link The slip of the motor is larger The efficiency of the motor is higher The starting current of the motor is lower The power factor of the motor is higher Check Answer
An induction motor with large number of slots has? Mark as favorite Copy Link low over-load capacity high over-load capacity either of the above none of the above Check Answer
Which of the following statements is correct regarding a 3-phase motor? Mark as favorite Copy Link Its magnetic flux alternates at the supply frequency lt is cheap, robust and needs no skilled maintenance Stator is externally connected rotor Three-phase supply is usually connected to its rotor Check Answer