Under running condition , the rotor resistance is proportional to

Related MCQs

• A 3 phase indution motor is running with slip of 4% hving synchronous speed of 1500rpm. If rotor induced emf per phase in standstill condition is 115.47V and rotor impedance in standstill condition is 0.1+j1 Ω then torque developed ia____.
• Under running condition, the rotor reactance is proportional to
• A 4 pole, 50Hz , 3 phase I M is running at 1425rpm on full load having rotor impedance per phase on standstill as 0.4+j2Ω. The external resistance required in the rotor per phase to get maximum torque at start is ___.
• A 25kW, 3 phase I.M. is running with 6% slip. Its rotor resistance per phase is____ if frictional losses are 850W and rotor current per phase is 65A.
• When an induction motor is running at full load, rotor reactance is ------rotor resistance
• Maximum torque during running condition developed by three phase induction motor can be obtained by changing rotor resistance
• A 3 phase induction motor is running with 4% slip. Its rotor input is 10kW then rotor copper losses are
• A 3 phase I.M. is running with 5% slip. Its rotor input is 20kW then its rotor efficiency is ____.
• The rotor standstill resistance and reactance of an induction motor are 0.5Ω and 2.5Ω hence the rotor impedance at 5% slip is____.
• The speed of rotating field due to rotor currents relative to rotor surface in an induction motor is