Electrical Machines To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used. any of above method. rheostatic control. Ward Leonard control. none of above. any of above method. rheostatic control. Ward Leonard control. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by (Pi / Pc) × full Load. (Pi / Pc)0.5 × Full Load. (Pi / Pc)1.6 × full Load. (Pi / Pc)2 × full Load. (Pi / Pc) × full Load. (Pi / Pc)0.5 × Full Load. (Pi / Pc)1.6 × full Load. (Pi / Pc)2 × full Load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The damper windings also called the squirrel cage windings or damper grids both (A) and (B). consists of short-circuited copper bars embedded in the field pole faces. are provided on the stator for improving power factor. are provided in a synchronous motor to make it self starting. both (A) and (B). consists of short-circuited copper bars embedded in the field pole faces. are provided on the stator for improving power factor. are provided in a synchronous motor to make it self starting. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 25% 2% 5% 4% 25% 2% 5% 4% 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 1000 rpm 500 rpm 2000 rpm 250 rpm 1000 rpm 500 rpm 2000 rpm 250 rpm 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
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