Electrical Machines In an auto-transformer, power is transferred through None of these conduction process only. both A and B. induction process only. None of these conduction process only. both A and B. induction process only. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC series motor is best suited for electric traction as It consume less power. It runs at very high speed at light load. It is cheaper in cost. It develops high starting torque. It consume less power. It runs at very high speed at light load. It is cheaper in cost. It develops high starting torque. 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%. 82.5% 67.5% 78.5% 72.5% 82.5% 67.5% 78.5% 72.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines which of the following losses are negligible in blocked rotor test? iron loss copper loss both A and B mechanical loss iron loss copper loss both A and B mechanical loss ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, electric current to the external circuit from armature is given through solid connection. none of above. slip rings. commutator. solid connection. none of above. slip rings. commutator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process? 38% 68% 40% 60% 38% 68% 40% 60% ANSWER DOWNLOAD EXAMIANS APP
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