DC Motors In dc machines fractional pitch winding is used To increase the generated emf To reduce the generated emf To improve cooling To reduce the sparking To increase the generated emf To reduce the generated emf To improve cooling To reduce the sparking ANSWER DOWNLOAD EXAMIANS APP
DC Motors A dc series motor is that which Can be started easily without load Has its field winding consisting of thick wire and less turns Has almost constant speed Has a poor torque Can be started easily without load Has its field winding consisting of thick wire and less turns Has almost constant speed Has a poor torque ANSWER DOWNLOAD EXAMIANS APP
DC Motors Small dc motors up to 5 HP usually have 4 poles 6 poles 8 poles 2 poles 4 poles 6 poles 8 poles 2 poles ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the speed of a dc shunt motor is increased the back emf of the motor will Remains same Decrease Become zero Increase Remains same Decrease Become zero Increase ANSWER DOWNLOAD EXAMIANS APP
DC Motors As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit Armature is temporarily open circuited A resistance is connected parallel to the armature A resistance is connected in series with armature A high value resistor is connected across the field winding Armature is temporarily open circuited A resistance is connected parallel to the armature A resistance is connected in series with armature A high value resistor is connected across the field winding ANSWER DOWNLOAD EXAMIANS APP
DC Motors In which of the following tests only one motor is required? Field's test Brake test Swinburne's test Hopkinson's test Field's test Brake test Swinburne's test Hopkinson's test ANSWER DOWNLOAD EXAMIANS APP
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