Electrical Machines Hunting in a synchronous motor takes place motor is under loaded. when supply voltage fluctuates. when power factor is unity. when load varies. motor is under loaded. when supply voltage fluctuates. when power factor is unity. when load varies. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When Flemings right hand rule to find the direction of induced emf, the thumb points towards direction of induced emf. direction of flux. direction of motion of the conductor. opposite to the direction of motion of the conductor. direction of induced emf. direction of flux. direction of motion of the conductor. opposite to the direction of motion of the conductor. 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 Both of above. Heavy sparking at brushes. Heavy sparking at the first stud of starting resistance steps. None of these. Both of above. Heavy sparking at brushes. Heavy sparking at the first stud of starting resistance steps. None of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up 220 V 6 V somewhat less than 220 V more than 220 V 220 V 6 V somewhat less than 220 V more than 220 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When the supply terminal of a DC shunt motor are interchanged The motor will run at its normal speed in the same direction as before. The motor will stop. The motor will run much faster in the same direction. The direction of rotation will reverse. The motor will run at its normal speed in the same direction as before. The motor will stop. The motor will run much faster in the same direction. The direction of rotation will reverse. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Short circuiting is caused in the armature winding due to any of above. failure of insulation between two turns of coil. failure of insulation between two commutator bars. grounding of two or more turns of the same coil. any of above. failure of insulation between two turns of coil. failure of insulation between two commutator bars. grounding of two or more turns of the same coil. ANSWER DOWNLOAD EXAMIANS APP
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