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Design a 25MVA, 33kV/12kV distribution substation for which you must describe and specify its layout (bus type and arrangement, voltage and spacing, protection,), construction and cost. Decide on the location.
Justify your assumptions and design.
Find the frequency response and impulse response of a system whose input x(t) and
output y(t) are related to the differential equation :

Example 3.8: Two electric Furnaces are supplied with single-phase circuit at 100 V from

& 3-phase, 13,750 V supply by means of two single-phase Scott-connected transformers with

similar seco;z dary windings when the load on main transformer is 625 kW and on the teaser

is 1000 kW, zohat current will flow in each of 3-phase lines at unity power factor ?


If v(t) = 10 cos(120πt+30o
) and i(t) = 6 cos(120πt+60o
), determine the average power, rms value of v(t),
and the power factor

Realize the following truth table using an appropriate MUX without using any additional gates F(x1, x2, x3, x4) = ∑m(1,2,6,9,10,12,13,14,15)


Explain the significance of Noise Margin? Calculate the Noise Margin for the hardware system following static discipline with voltage levels provided below:
VIL = 1.7 V VIH = 3.2 V VOL = 0.6 V VOH = 4.4 V
Explain the working of N channel Enhancement MOSFET with all necessary diagrams? What is the significance of the gate-source voltage?
Explain how the Zener diode acts as a voltage regulator? How it maintains the regulation with unregulated input or the variable load? Elaborate with suitable example
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