Electrical Machines Cogging and crawling are phenomena associated with cage induction machines and they are essentially the same. the former during starting and the latter at a fraction of its rated speed. the former at a fraction of its rate speed and the latter during starting. any of the above. cage induction machines and they are essentially the same. the former during starting and the latter at a fraction of its rated speed. the former at a fraction of its rate speed and the latter during starting. any of the above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The sparking at the the brushes, in a DC machines is due to armature reaction. reactance voltage. presence of commutator. high resistance of carbon brushes. armature reaction. reactance voltage. presence of commutator. high resistance of carbon brushes. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Interpoles in a DC motor must be Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature. Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature. Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature. Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature. Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature. Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature. Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature. Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature. 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. 27.73 Nm . 65.8 Nm. 74 Nm. 38.5 Nm. 27.73 Nm . 65.8 Nm. 74 Nm. 38.5 Nm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with constant V, Tst increases None of these constant supply voltage V, starting torque Tst decreases either of these constant V, Tst increases None of these constant supply voltage V, starting torque Tst decreases either of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature flux is.............with respect to main field flux or main field poles? rotates opposite direction None of these rotates same direction stationary rotates opposite direction None of these rotates same direction stationary ANSWER DOWNLOAD EXAMIANS APP
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