Electrical Machines In a dc machine 72 number of coils are used. Find the number of commutator segments required? 36 74 72 37 36 74 72 37 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with constant V, Tst increases constant supply voltage V, starting torque Tst decreases None of these either of these constant V, Tst increases constant supply voltage V, starting torque Tst decreases None of these either of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is Pc/Pi √(Pi/Pc) (Pi/Pc)2 Pi/Pc Pc/Pi √(Pi/Pc) (Pi/Pc)2 Pi/Pc ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which one of the following statement is correct ? In an induction motor if the air gap is increased then its speed will increase its efficiency will improve its speed will reduce its power factor will reduce its speed will increase its efficiency will improve its speed will reduce its power factor will reduce ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be either (B) or (C). an integral multiple of number of rotor slots. equal to number of rotor slots. unequal to number of rotor slots and skewed in shape. either (B) or (C). an integral multiple of number of rotor slots. equal to number of rotor slots. unequal to number of rotor slots and skewed in shape. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The overall power factor of an on load transformer is always leading. is always unity. is always lagging. depends on the power factor of the load. is always leading. is always unity. is always lagging. depends on the power factor of the load. ANSWER DOWNLOAD EXAMIANS APP
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