An $$SCR$$ is connected in series with a $$300V$$ $$ac$$ supply and a $$300$$ ohms load resistor calculate

(a) The reading of a moving coil ammeter connected in series with the load and

(b) The reading of a moving iron voltmeter connected across the $$SCR$$ for firing angle of $${45^ \circ }$$

A single - phase bridge inverter is fed from a $$200V$$ $$d.c$$ supply and is operated at $$50$$ $$Hz.$$ It is connected to a load having a resistance of $$20$$ $$ohms$$ and an inductance of $$0.2.$$ $$H.$$ Draw the load current waveform in the the steady indicating the peak values.

A factory draws $$100$$ kW at $$0.7$$ p.f. lagging from a $$3$$-phase, $$11$$ kV supply. It is desired to the p.f. to $$0.95$$ lagging using series capacitors. Calculate the rating of the capacitor required.

A $$100$$ $$MVA$$, $$11$$ $$kV$$, $$3$$-phase, $$50$$ $$Hz$$, $$8$$-pole synchronous generator has an inertia constant H equal to $$4$$ $$MJ/MVA.$$ The stored energy in the rotor of the generator at synchronous speed will be $$H = {E \over G}$$