For the following questions answer them individually
The rms of the alternating current given by the equation $$i = 50 \sin (314t - 10^\circ t) + 30 \sin (314t - 20^\circ)$$ is
A series RLC circuit will have unity power factor if operated at a frequency of
In a balanced 3-phase system, the current coil of a wattmeter is inserted in line 1 and the potential coil across 2 and 3. If the wattmeter reads 100 W, the reactive power drawn by the 3-phase load is
An electric iron is rated at 230 V, 400 W, 50 Hz. The voltage rating 230 V refers to
A non-sinusoidal periodic waveform is free from DC component, cosine components and even harmonics. The waveform has
A periodic train of rectangular pulses x(t) with a time period of 25 seconds, has a pulse width of 9 seconds as shown in figure. The RMS value of the waveform is
The time constant of the network shown in the figure is
In the series RC circuit, the voltage across C starts increasing, the moment the circuit is switched to V volts DC. The rate of increase of voltage across C at the instant just after the switch is closed (i.e. at $$t = 0^{+}$$) is
Form factor of an alternating wave is
The phase difference between the following voltage and current waves $$v = 311 \sin (100 \pi t + 30^\circ)$$ Volts $$i = 17 \sin (100 \pi t - 20^\circ)$$ Amps is