Electrical Machines In IM the rotor lamination can be ________________ than stator laminations. sipper. thicker. thinner. rotor can not have any laminations. sipper. thicker. thinner. rotor can not have any laminations. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will Reduce by 5%. Increase by 5%. Remain unchanged. Depends on other factor. Reduce by 5%. Increase by 5%. Remain unchanged. Depends on other factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is 3 only 1, 2 and 3 1, 3 1, 2, 3 and 4 3 only 1, 2 and 3 1, 3 1, 2, 3 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An electric motor with constant output power will have a torque speed characteristics in the form of a Straight line through the origin. Rectangular hyperbola Straight line parallel to the speed axis. Circle about the origin. Straight line through the origin. Rectangular hyperbola Straight line parallel to the speed axis. Circle about the origin. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Synchronising power of a synchronous motor varies directly as Xs2 All of these directly as synchronous reactances Xs inversely as 1/Xs directly as Xs2 All of these directly as synchronous reactances Xs inversely as 1/Xs ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines With the increase in speed of DC motor Both back emf as well as line current fall. Back emf increase but line current falls. Back emf falls and line current increase. Both back emf as well as line current increase. Both back emf as well as line current fall. Back emf increase but line current falls. Back emf falls and line current increase. Both back emf as well as line current increase. ANSWER DOWNLOAD EXAMIANS APP
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