Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as T ∝ P. T2 ∝ P3. T ∝ √P. T is independent of P. T ∝ P. T2 ∝ P3. T ∝ √P. T is independent of P. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the handle of a three point starter goes to back to OFF position, it may be due to over load. all of these. zero or very low voltage supply. high filed circuit resistance. over load. all of these. zero or very low voltage supply. high filed circuit resistance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V-curve of synchronous motor shows the variation of All of these power factor and supply voltage during hunting supply voltage and field current at constant excitation power factor and dc excitation at constant load All of these power factor and supply voltage during hunting supply voltage and field current at constant excitation power factor and dc excitation at constant load ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An IM cannot run at synchronous speed because none of above. induction motor will become synchronous motor. air friction will prevent it. rotor torque will not be produced. none of above. induction motor will become synchronous motor. air friction will prevent it. rotor torque will not be produced. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that both Eb and Td are unchanged Eb is unchanged, but Td is zero both Eb and Td are zero Eb is zero, but Td is unchanged both Eb and Td are unchanged Eb is unchanged, but Td is zero both Eb and Td are zero Eb is zero, but Td is unchanged ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If an induction machine is run at above the synchronous speed it acts as an induction motor None of these a synchronous motor an induction generator an induction motor None of these a synchronous motor an induction generator ANSWER DOWNLOAD EXAMIANS APP
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