Electrical Machines The material used for commutator brushes is mostly copper. carbon. cast iron. mica. copper. carbon. cast iron. mica. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC generator without commutator is a DC generator induction motor DC motor AC generator DC generator induction motor DC motor AC generator ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is 15.1 Ω 31.1 Ω 15.9 Ω 31.9 Ω 15.1 Ω 31.1 Ω 15.9 Ω 31.9 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant. 38.5 Nm. 74 Nm. 65.8 Nm. 27.73 Nm . 38.5 Nm. 74 Nm. 65.8 Nm. 27.73 Nm . ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used. None of above. Rheostatic control. Ward Leonard control. Any of above method. None of above. Rheostatic control. Ward Leonard control. Any of above method. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following statement is true for an AC synchronous motor? It is a variable speed motor. It is a step angled motor. It is a constant speed motor. It is a high reluctance motor. It is a variable speed motor. It is a step angled motor. It is a constant speed motor. It is a high reluctance motor. ANSWER DOWNLOAD EXAMIANS APP
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