The field windings of a series motor has a resistance of 180 ohms at 30 degree Celsius. After running for 5 hours, the resistance increases to 140 ohms. If the temperature coefficient of the windings at o degree Celsius is o.004. Find the new temperature of the windings.

Rotor resistance of a three-phase induction motor is 0.080 per phase. Maximum torque is available at the slip of 12%. Calculate the equivalent load resistance, load voltage and load current at this slip. Gross output power is 9 kW. zwoll E2 1₂ INSTR₂=0.08001 od X₂ boobs Yo not www YOUR voor R₁ R₂(1/S-1) constaies sidsiuv od lliw sad jedanss

the field windings of a series motor has a resistance of 120 ohms at 15° c. after running for 2 hours, the resistance has increases to 140 ohms. if the temperature coefficient of the windings at 0°C is 0.004, find the new temperature of the windings

The frequency of rotor current in an induction motor is       slip times the frequency of stator current.       slip times the frequency of supply,     One by slip times the frequency of stator current.       One by slip times the frequency of supply

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1. An induction motor is operating near its synchronous speed. It is supplied from a 50Hz 400V (1-1) source and it has 2 poles, RR = 0.52. If the load torque is TL = 63 10-3 w² (w in rad/s), calculate speed and torque. rad Wα = 104.1 S Tm = 682.34Nm

A 3-0, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between slip-rings on open circuit. Calculate the current and power factor in each phase of the rotor windings at standstill when joined to a star-connected circuit, each limb of which has a resistance of 10 Q and an inductance of 0.03 H. The resistance per phase of the rotor windings is 0.2 Q and inductance 0.03 H. Calculate also the current and power factor in each rotor phase when the rings are short- circuited and the motor is running with a slip of 4 per cent. [13.6 A, 0.48; 27.0 A, 0.47] (London University) A 4-pole, 50-Hz, 3-phase induction motor has a slip-ring rotor with a resistance and standstill reactance of 0.04 2 and 0.2 2 per phase respectively. Find the amount of resistance to be inserted in each rotor phase to obtain full-load torque at starting. What will be the approximate power factor in the rotor at this instant ? The slip at full-load is 3 per cent. [0.084 2, 0.516 p.f.]…

Q3 A 50 Hz split-phase induction motor has a resistance of 50 and an inductive reactance of 200 in the main winding as well as starting winding. Determine the value of resistance and capacitance to be added in series with the starting winding to send the same current in each winding with a phase difference of 90°. Ans[ 14.99 Ω, 127.5μF]

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