Electrical Machines To avoid formation of grooves in the commutator brush position has no effect on the commutator grooving. the brushes of same polarity should track each other. None of these the brushes of opposite polarity should track each other. brush position has no effect on the commutator grooving. the brushes of same polarity should track each other. None of these the brushes of opposite polarity should track each other. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is 0 V. 60 V. 20 V. 40 V. 0 V. 60 V. 20 V. 40 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Transformer oil is used as inert medium. a coolant. an insulator. both A and B. inert medium. a coolant. an insulator. both A and B. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Semi closed slots or totally closed slots are used in induction motors, essentially to decrease starting torque reduce magnetising current and improve power factor increase pull out torque improve starting torque decrease starting torque reduce magnetising current and improve power factor increase pull out torque improve starting torque ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 5% 2% 4% 25% 5% 2% 4% 25% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The compensating winding in a DC machine is located on pole shoes to avoid the sparking at the brushes. is located on pole shoes for avoiding the flashover at the commutator. is located in armature slots for compensation of the armature reaction. is located on commutating poles for improving commutation. is located on pole shoes to avoid the sparking at the brushes. is located on pole shoes for avoiding the flashover at the commutator. is located in armature slots for compensation of the armature reaction. is located on commutating poles for improving commutation. ANSWER DOWNLOAD EXAMIANS APP
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