Electrical Machines If the field of a dc shunt motor gets opened while the motor is running, then the armature current will drop armature will oscillate about original speed as the mean speed motor will become slow. motor will attain dangerously high speed armature current will drop armature will oscillate about original speed as the mean speed motor will become slow. motor will attain dangerously high speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A large series motor is never started without some mechanical load on it because otherwise it will develop excessive speed and damage itself. draw too much current. produce sparking at brushes. open fuse or circuit breaker. develop excessive speed and damage itself. draw too much current. produce sparking at brushes. open fuse or circuit breaker. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases? None of above. Increases. Decreases. Remain unchanged None of above. Increases. Decreases. Remain unchanged ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is 40 A. 44 A. 440 A. 400 A. 40 A. 44 A. 440 A. 400 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor is suitable for frequent starting and stoppings? Capacitor start motor Capacitor start capacitor run motor All of these Resistance split phase motor Capacitor start motor Capacitor start capacitor run motor All of these Resistance split phase motor 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 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. 250 V. ANSWER DOWNLOAD EXAMIANS APP
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