Electrical Machines The armature mmf of a DC machine has trapezoidal space distribution and is stationary in space. triangular space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. triangular space distribution and rotates at the speed of armature. trapezoidal space distribution and is stationary in space. triangular space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. triangular space distribution and rotates at the speed of armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Slip speed is the difference of actual rotor speed and synchronous speed. difference of synchronous speed and actual rotor speed. sum of synchronous and rotor speeds. half of the sum of synchronous and rotor speeds. difference of actual rotor speed and synchronous speed. difference of synchronous speed and actual rotor speed. sum of synchronous and rotor speeds. half of the sum of synchronous and rotor speeds. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The sparking at the the brushes, in a DC machines is due to reactance voltage. high resistance of carbon brushes. presence of commutator. armature reaction. reactance voltage. high resistance of carbon brushes. presence of commutator. armature reaction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The frame of an induction motor is made of aluminium. stainless steel. silicon steel. closed grained cast iron. aluminium. stainless steel. silicon steel. closed grained cast iron. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A smaller air gap in a polyphase induction motor helps to increase the starting torque. reduce the magnetizing current. reduce the chance of cogging. reduce the chance of crawling. increase the starting torque. reduce the magnetizing current. reduce the chance of cogging. reduce the chance of crawling. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be 2000 rpm 1000 rpm 250 rpm 500 rpm 2000 rpm 1000 rpm 250 rpm 500 rpm ANSWER DOWNLOAD EXAMIANS APP
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