Electrical Machines A small air gap in poly phase induction motor helps to increase starting torque. reduce magnetizing current. reduce chance of crawling. reduce chance of cogging. increase starting torque. reduce magnetizing current. reduce chance of crawling. reduce chance of cogging. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC generator will not build up voltage if it has lost residual magnetism. if field resistance is more than critical resistance. any one of above. due to wrong direction of rotation. if it has lost residual magnetism. if field resistance is more than critical resistance. any one of above. due to wrong direction of rotation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor speed of an induction motor is given by Nr = 120f / p × (1-s). Ns = 120f / p × ( 1 - s ). None of these Ns = 120f /p × ( 1 - r). Nr = 120f / p × (1-s). Ns = 120f / p × ( 1 - s ). None of these Ns = 120f /p × ( 1 - r). ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction effect is more in which of the following methods? field weakening method None of these same in both methods armature resistance control field weakening method None of these same in both methods armature resistance control ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Reluctance and hysteresis motors are the types of which electrical motor? DC motor. 1 - Φ synchronous motor. 3 - Φ induction motor. Stepper motor. DC motor. 1 - Φ synchronous motor. 3 - Φ induction motor. Stepper motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines During hunting of a synchronous motor negative phase sequence currents are generated. harmonic are developed in the armature circuit. damper bar develops torque. field excitation increases. negative phase sequence currents are generated. harmonic are developed in the armature circuit. damper bar develops torque. field excitation increases. ANSWER DOWNLOAD EXAMIANS APP
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