Electrical Machines For successful parallel operation of two single phase transformers, the most essential condition is that their percentage impedances are equal KVA ratings are equal polarities are properly connected turn- ratios are exactly equal percentage impedances are equal KVA ratings are equal polarities are properly connected turn- ratios are exactly equal ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Synchronous reactance of an alternator represents armature reactance and leakage reactance All of these a reactance operating at synchronous speed field winding reactance armature reactance and leakage reactance All of these a reactance operating at synchronous speed field winding reactance ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements 1 and 3 are correct 1, 2 and 4 are correct 2 and 4 are correct 1, 2 and 3 are correct 1 and 3 are correct 1, 2 and 4 are correct 2 and 4 are correct 1, 2 and 3 are correct ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, brushes are always placed along magnetic neutral axis. geometrical neutral axis. armature axis. load axis. magnetic neutral axis. geometrical neutral axis. armature axis. load axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase any of the two machines machine A machine B none of these any of the two machines machine A machine B none of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is 1, 3 1, 4 2, 4 2, 3 1, 3 1, 4 2, 4 2, 3 ANSWER DOWNLOAD EXAMIANS APP
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