DC Motors In dc machines fractional pitch winding is used To improve cooling To increase the generated emf To reduce the sparking To reduce the generated emf To improve cooling To increase the generated emf To reduce the sparking To reduce the generated emf ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a D.C. generator, the iron losses mainly take place in Commutator Yoke Armature rotor Armature conductors Commutator Yoke Armature rotor Armature conductors ANSWER DOWNLOAD EXAMIANS APP
DC Motors Carbon brushes are preferable to copper brushes because _____ They have lower resistance They reduce armature reaction They have longer life They reduce sparking They have lower resistance They reduce armature reaction They have longer life They reduce sparking ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of higher H.P. should be selected Of lower H.P. should be selected Can be used for 50°C ambient temperature also Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Of higher H.P. should be selected Of lower H.P. should be selected Can be used for 50°C ambient temperature also ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following can be used for controlling the speed of a dc motor? Transistor Thermistor Thyratron Thyristor Transistor Thermistor Thyratron Thyristor ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 50% of the previous value 10% of the previous value 100% of the previous value 25% of the previous value 50% of the previous value 10% of the previous value 100% of the previous value 25% of the previous value ANSWER DOWNLOAD EXAMIANS APP
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