Electrical Machines If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is zero All of these maximum minimum zero All of these maximum minimum ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The starting resistance of DC motor is generally Low. around 500 ohms. 1000 ohms. Infinitely large. Low. around 500 ohms. 1000 ohms. Infinitely large. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process? 60% 40% 38% 68% 60% 40% 38% 68% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which method is less recommendable for induction motor starting in the industries? Auto transformer starting. Stator resistance starting. Direct online starting. Rotor resistance starting. Auto transformer starting. Stator resistance starting. Direct online starting. Rotor resistance starting. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of DC Shunt Motor electromagnetic torque developed is None of above. Proportional to the square of armature current. Inversely proportional to the armature current. Proportional to the armature current. None of above. Proportional to the square of armature current. Inversely proportional to the armature current. Proportional to the armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will none of these. increase. Decrease.d remains same. none of these. increase. Decrease.d remains same. ANSWER DOWNLOAD EXAMIANS APP
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