Electrical Machines The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is 40 660 600 60 40 660 600 60 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The fall in speed of the DC generator due to increase in load can be corrected by reducing the load voltage. increasing the excitation. increasing the input to the prime mover. cooling the armature. reducing the load voltage. increasing the excitation. increasing the input to the prime mover. cooling the armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When maximum flux density is constant, the eddy current losses are proportional to f V f2 V2 f V f2 V2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve high efficiency. low starting torque. reduced size. quick acceleration. high efficiency. low starting torque. reduced size. quick acceleration. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then None of these I1 = I2 I1 > I2 I1 < I2 None of these I1 = I2 I1 > I2 I1 < I2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between Stator mmf wave and resultant flux density. Stator mmf wave and resultant mmf wave. Rotor mmf wave and stator mmf wave. Rotor mmf wave and resultant flux density wave. Stator mmf wave and resultant flux density. Stator mmf wave and resultant mmf wave. Rotor mmf wave and stator mmf wave. Rotor mmf wave and resultant flux density wave. ANSWER DOWNLOAD EXAMIANS APP
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