Electrical Machines Which of the following is/are the advantages of carbon brush over the copper brush? They are self lubricating in nature All of these They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes They are self lubricating in nature All of these They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When an electric train is moving down a hill, the DC motor will operate as DC series generator. DC shunt generator. DC series motor. DC shunt motor. DC series generator. DC shunt generator. DC series motor. DC shunt motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed? The speed will increase abruptly. The speed will increase in proportion to reduction in load. The speed will remains almost constant. The speed will increase gradually. The speed will increase abruptly. The speed will increase in proportion to reduction in load. The speed will remains almost constant. The speed will increase gradually. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which single phase motor is used for a refrigerator? Repulsion. Capacitor run. Universal. Split phase. Repulsion. Capacitor run. Universal. Split phase. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is 40 600 660 60 40 600 660 60 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 excitation. reducing the load voltage. cooling the armature. increasing the input to the prime mover. increasing the excitation. reducing the load voltage. cooling the armature. increasing the input to the prime mover. ANSWER DOWNLOAD EXAMIANS APP
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