Electrical Machines Resistance commutation is used generally in case of DC machines bellow 5 kW. DC machines above 10 kW. fractional kW DC machines. None of these DC machines bellow 5 kW. DC machines above 10 kW. fractional kW DC machines. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be A - C - B. B - C - A. C - A - B. B - C - A or C - A - B. A - C - B. B - C - A. C - A - B. B - C - A or C - A - B. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Field winding of a DC series motor is usually provided with thick wire as it carries large load current. to reduce the insulation of materials. to provide large flux. in order to reduce eddy current to provide large flux. as it carries large load current. to reduce the insulation of materials. to provide large flux. in order to reduce eddy current to provide large flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction of an unsaturated DC machine is crossmagnetising. magnetising. demagnetising. none of above. crossmagnetising. magnetising. demagnetising. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous generator V curve is drawn between field current on Y-axis and armature current on X-axis. field current on X-axis and armature current on Y-axis. either of these. field current on X-axis and power factor on Y-axis. field current on Y-axis and armature current on X-axis. field current on X-axis and armature current on Y-axis. either of these. field current on X-axis and power factor on Y-axis. 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
EXAMIANS