In the circuit shown, $Z_1 = 50\angle -90^{\circ} \Omega$ and $Z_2 = 200\angle -30^{\circ} \Omega$. It is supplied by a three phase 400 V source with the phase sequence being R-Y-B. Assume the watt meters $W_1$ and $W_2$ to be ideal. The magnitude of the difference between the readings of $W_1$ and $W_2$ in watts is _________________ (rounded off to 2 decimal places).
The table lists two instrument transformers and their features:
| Instrument Transformers | Features |
|---|---|
| X) Current Transformer (CT) | P) Primary is connected in parallel to the grid |
| Y) Potential Transformer (PT) | Q) Open circuited secondary is not desirable |
| R) Primary current is the line current | |
| S) Secondary burden affects the primary current |
The correct matching of the two columns is
A three phase, 50 Hz, 6 pole induction motor runs at 960 rpm. The stator copper loss, core loss, and the rotational loss of the motor can be neglected. The percentage efficiency of the motor is
Which one of the following options represents possible voltage polarities in a single phase two winding transformer? Here, $V_p$ is the applied primary voltage, $E_p$ is the induced primary voltage, $V_s$ is the open circuit secondary voltage, and $E_s$ is the induced secondary voltage.
