Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 1.0. 1.5 to 2. 2 to 3. 3 to 5. 1.0. 1.5 to 2. 2 to 3. 3 to 5. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Semi closed slots or totally closed slots are used in induction motors, essentially to increase pull out torque improve starting torque decrease starting torque reduce magnetising current and improve power factor increase pull out torque improve starting torque decrease starting torque reduce magnetising current and improve power factor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Exciting current of an induction motor is lesser than power transformer. equal as power transformer. higher than power transformer. none of these. lesser than power transformer. equal as power transformer. higher than power transformer. none of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series 66.91 V. 56.91 V. 76.91 V. 86.91 V. 66.91 V. 56.91 V. 76.91 V. 86.91 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a synchronous motor is running at synchronous speed, the damper winding produces eddy current torque. damping torqe. both 1 and 2. no torque. eddy current torque. damping torqe. both 1 and 2. no torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf of a DC machine has trapezoidal space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. triangular space distribution and is stationary in space. triangular space distribution and rotates at the speed of armature. trapezoidal space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. triangular space distribution and is stationary in space. triangular space distribution and rotates at the speed of armature. ANSWER DOWNLOAD EXAMIANS APP
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