Electrical Machines No load test on induction motor is conducted to find which of the following losses? Rotational loss All of these Stator copper loss Stator core loss Rotational loss All of these Stator copper loss Stator core loss ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The no load current in a transformer lags the applied voltage by about 75°. 90°. 0°. about 115°. about 75°. 90°. 0°. about 115°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load? 1037.5 r.p.m. 4575.4 r.p.m. 1130 r.p.m. none of above. 1037.5 r.p.m. 4575.4 r.p.m. 1130 r.p.m. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be 250 V. about 100 V. very small, say about 2 or 3 V. zero. 250 V. about 100 V. very small, say about 2 or 3 V. zero. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor will remain the same will become leading will become lagging None of these will remain the same will become leading will become lagging None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current Would be equal to If1. Woud be equal to 2If1. Would be equal to If1/2. Cannot be predicted due to insufficient data. Would be equal to If1. Woud be equal to 2If1. Would be equal to If1/2. Cannot be predicted due to insufficient data. ANSWER DOWNLOAD EXAMIANS APP
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