(Q2) Electrical Machines | Numerical Solve | Gate Exam
Channel: Smart Electrical
Date: 2021-05-09

(Q2) Electrical Machines | Numerical Solve | Gate Exam
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(Q2) Electrical Machines | Numerical Solve | Gate Exam
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Today's Questions are: 
1. A 375 W, 230 V, 50 Hz, capacitor start single-phase induction motor has the following constants for the main and auxiliary windings (at starting): Zm = (12.50 + j15.75)Ω (main winding), Za = (24.50 + 12.75)Ω (auxiliary winding). Neglecting the magnetizing branch, the value of the capacitance (in μF) to be added in series with the auxiliary winding to obtain maximum torque at starting is ___________.
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2. A separately excited dc motor has an armature resistance Ra = 0.05 Ω. The field excitation is kept constant. At an armature voltage of 100 V, the motor produces a torque of 500 Nm at zero speed. Neglecting all mechanical losses, the no-load speed of the motor (in radian/s) for an armature voltage of 150 V is _____ (up to 2 decimal places).