List of top Power Systems Questions on AC and DC transmission

A BJT biasing circuit is shown in the figure, where $V_{BE = 0.7V$ and $\beta = 100$. The Quiescent Point values of $V_{CE}$ and $I_{C}$ are respectively:} \includegraphics[width=0.4\linewidth]{42.png}

Let $ f(t) $ be a real-valued function whose second derivative is positive for $ -\inftyLt;tLt;\infty $. Which of the following statements is/are always true?

Consider the function $ f(t) = (\max(0, t))^2 $ for $ -\inftyLt;tLt;\infty $, where $ \max(a, b) $ denotes the maximum of $ a $ and $ b $. Which of the following statements is/are true?

The incremental cost curves of two generators ($ \text{Gen A} $ and $ \text{Gen B} $) in a plant supplying a common load are shown. If the incremental cost of supplying the common load is $ \lambda = 7400 \, \text{Rs/MWh} $, the common load in MW is ________________ (rounded to the nearest integer).

The incremental cost curves of two generators ($ \text{Gen A} $ and $ \text{Gen B} $) in a plant supplying a common load are shown. If the incremental cost of supplying the common load is $ \lambda = 7400 \, \text{Rs/MWh} $, the common load in MW is \_\_\_\_\_ (rounded to the nearest integer).
\includegraphics[width=0.5\linewidth]{34.png}

In the figure shown, self-impedances of the two transmission lines are 1.5j p.u each, and $Z_m = 0.5j$ p.u is the mutual impedance. Bus voltages shown in the figure are in p.u. Given that $\delta > 0$, the maximum steady-state real power that can be transferred in p.u from Bus-1 to Bus-2 is