Electrical Machines When a transformer is loaded, the secondary terminal voltage drops. That means power factor is unity. zero. leading. lagging. unity. zero. leading. lagging. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a DC motor can be determent by Lenzs law. Flemings left hand rule. Flemings right hand rule. Amperes law. Lenzs law. Flemings left hand rule. Flemings right hand rule. Amperes law. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines At slip s = 1 torque developed in machine is maximum torque. starting torque. none. electromagnetic torque. maximum torque. starting torque. none. electromagnetic torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be cross-magnetisation. none of above. demagnetisation. cross-magnetization as well as demagnetization. cross-magnetisation. none of above. demagnetisation. cross-magnetization as well as demagnetization. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is 1, 2, 5 1, 2, 3, 4 2, 3, 4 1, 3, 5 1, 2, 5 1, 2, 3, 4 2, 3, 4 1, 3, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine is invariably provided with forced ventilation? Fractional horse power slow speed motor. 50 MW generator in a power plant. Hermetically sealed motor of refrigerator. Fractional horse power high speed motor. Fractional horse power slow speed motor. 50 MW generator in a power plant. Hermetically sealed motor of refrigerator. Fractional horse power high speed motor. ANSWER DOWNLOAD EXAMIANS APP
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