Electrical Machines R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is R1 /K R1 /K² K×R1 K²R1 R1 /K R1 /K² K×R1 K²R1 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The power flow of a dc motor, with respect to a DC generator is modified. reversed. none of these. increased. modified. reversed. none of these. increased. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 88.8%. 59.2%. 48.0%. 57.1%. 88.8%. 59.2%. 48.0%. 57.1%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Lamination of transformer core is made of silicon steel. wrought iron. cast steel. cast iron. silicon steel. wrought iron. cast steel. cast iron. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Rotating magnetic field is produced in an induction motor because of None of these rotor winding. either stator winding or rotor winding. stator winding. None of these rotor winding. either stator winding or rotor winding. stator winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will rotate in the same direction as before maintenance. get heated and damaged. rotate in direction opposite to that before maintenance. not start at all. rotate in the same direction as before maintenance. get heated and damaged. rotate in direction opposite to that before maintenance. not start at all. ANSWER DOWNLOAD EXAMIANS APP
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