Electrical Machines Wave winding is prefered for which of the following rating? high current and low voltage low current and high voltage low current and low voltage high current and high voltage high current and low voltage low current and high voltage low current and low voltage high current and high voltage ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 78.5% 82.5% 72.5% 67.5% 78.5% 82.5% 72.5% 67.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance. shunt field armature circuit none of above both A and B shunt field armature circuit none of above both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which type of motors are used for lathes? DC shunt motors. Synchronous motor. Either A or B. Cage induction motor. DC shunt motors. Synchronous motor. Either A or B. Cage induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The use of higher flux density in the transformer design None of these reduces the weigh per KVA increases the weigh per KVA has no relation with the weight of transformer None of these reduces the weigh per KVA increases the weigh per KVA has no relation with the weight of transformer ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will continue to work as alternator but the direction of rotation will reverse. continue to work as synchronous motor with same direction of rotation. start working as induction motor. come to stand still. continue to work as alternator but the direction of rotation will reverse. continue to work as synchronous motor with same direction of rotation. start working as induction motor. come to stand still. ANSWER DOWNLOAD EXAMIANS APP
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