Electrical Machines A synchronous motor will deliver maximum power when load angle is 0°. input power factor is unity. load angle is equal to internal angle θ. load angle is 45°. load angle is 0°. input power factor is unity. load angle is equal to internal angle θ. load angle is 45°. 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 56.91 V. 76.91 V. 66.91 V. 86.91 V. 56.91 V. 76.91 V. 66.91 V. 86.91 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous motor, the damper winding is generally used to reduce the eddy currents. reduce noise level only. provide starting torque only. prevent hunting and provide the starting torque. reduce the eddy currents. reduce noise level only. provide starting torque only. prevent hunting and provide the starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The compensating winding in a DC machine is located on pole shoes for avoiding the flashover at the commutator. is located on pole shoes to avoid the sparking at the brushes. is located in armature slots for compensation of the armature reaction. is located on commutating poles for improving commutation. is located on pole shoes for avoiding the flashover at the commutator. is located on pole shoes to avoid the sparking at the brushes. is located in armature slots for compensation of the armature reaction. is located on commutating poles for improving commutation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ? ωe = 1/2*ωm ωe = ωm ωe = 2*ωm ωe = 4*ωm ωe = 1/2*ωm ωe = ωm ωe = 2*ωm ωe = 4*ωm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for hoisting and lowering which type of motor is preferred? AC slip ring motor. Synchronous motor. DC series motor. Single phase induction motor. AC slip ring motor. Synchronous motor. DC series motor. Single phase induction motor. ANSWER DOWNLOAD EXAMIANS APP
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