Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as f² V² V f f² V² V f ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The fall in speed of the DC generator due to increase in load can be corrected by increasing the input to the prime mover. reducing the load voltage. increasing the excitation. cooling the armature. increasing the input to the prime mover. reducing the load voltage. increasing the excitation. cooling the armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are not a self starting motor? both 1 and 2 1-phase induction motor None of these 3-phase induction motor both 1 and 2 1-phase induction motor None of these 3-phase induction motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron None of these reduces the saturation magnetization. increases the hysteresis loss. increases the electrical resistivity of iron. None of these reduces the saturation magnetization. increases the hysteresis loss. increases the electrical resistivity of iron. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Short circuiting is caused in the armature winding due to failure of insulation between two commutator bars. any of above. grounding of two or more turns of the same coil. failure of insulation between two turns of coil. failure of insulation between two commutator bars. any of above. grounding of two or more turns of the same coil. failure of insulation between two turns of coil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to 350 V. 420 V. 400 V. 480 V. 350 V. 420 V. 400 V. 480 V. ANSWER DOWNLOAD EXAMIANS APP
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