Electrical Machines Which of following DC generator will be in a position to build up without any residual magnetism in the field? Shunt. Compound. Separately excited. Series. Shunt. Compound. Separately excited. Series. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P) T is independent of P T∝ P² T∝ P³ T∝ P T is independent of P T∝ P² T∝ P³ T∝ P ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ? 1 and 2 2 alone 1, 2 and 3 1 and 3 1 and 2 2 alone 1, 2 and 3 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of None of these. Heavy sparking at brushes. Heavy sparking at the first stud of starting resistance steps. Both of above. None of these. Heavy sparking at brushes. Heavy sparking at the first stud of starting resistance steps. Both of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the excitation is reduced, the power factor is None of these lagging power factor unity power factor leading power factor None of these lagging power factor unity power factor leading power factor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The current drawn by a DC motor at the time of starting is Zero. Very high. Normal. Very low. Zero. Very high. Normal. Very low. ANSWER DOWNLOAD EXAMIANS APP
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