PYQs Based test 22: Power Electronics

In the given rectifier, the delay angle of the thyristor $T_1$${}_{\text{­}}$ measured from the positive going zero crossing of $V_s$ is $30^{\circ }$. If the input voltage $V_s$ is $100sin\left(100\pi t\right)V$, the average voltage across $R$ (in volt) under steady-state is_______.

The voltage $\left(V_s\right)$ across and the current $\left(i_s\right)$ through a semiconductor switch during a turn ON transition are shown in figure. The energy dissipated during the turn – ON transition, in $mJ$, is_______.

The switches $T1$ and $T2$ in Figure (a) are switched in a complementary fashion with sinusoidal pulse width modulation technique. The modulating voltage vm (t) = 0.8 sin $\left(200\pi t\right)V$ and the triangular carrier voltage $\left(V_c\right)$ are as shown in Figure (b). The carrier frequency is $5kHz$. The peak value of the $100Hz$ component of the load current $\left(i_L\right)$, in ampere, is ________

The circuit shown in meant to supply a resistive load R${}_L$ from two separate DC voltage sources. The switches S₁ and S₂ are controlled so that only one of them is ON at any instant S₁ is turned on for 0.2 ms ad S₂ is turned on for 0.3 ms in a 0.5 ms switching cycle time period. Assuming continuous conduction of the inductor current and negligible ripple on the capacitor voltage, the output voltage V${}_O$ (in volt) across R${}_L$ is –

The figure shows one period of the output voltage of an inverter, should be chosen such that $60^{\circ }<\alpha <90^{\circ }$. If the rms value of the fundamental component is $50V$, then α in degree is