List of top Electrical Machines Questions asked in GATE Instrumentation Engineering

A 2-pole, 50 Hz, 3-phase induction motor supplies power to a certain load at 2970 rpm. The torque-speed curve of this machine follows a linear relationship between synchronous speed and 95% of synchronous speed. Assume mechanical and stray losses to be zero. If the load torque of the motor is doubled, the new operating speed of the motor, in rpm, is:
Short-circuit test on a single-phase transformer at 1 kHz gives: wattmeter \(P=8\) W, primary current \(I=2\) A, primary voltage \(V=6\) V. Assume negligible no-load loss/current and linear core. With the secondary shorted, the primary is now fed from a \(2\) V\(_{\mathrm{RMS}}\), 1 kHz source in series with a capacitor of value \( \dfrac{1}{2\pi\sqrt{5}} \) mF. The primary RMS current is _____A (rounded off to two decimals).