UPSC Electrical Engineering 2022

(a) For the circuit shown in Figure 1(a), find the V_in, V_S and power supplied by the dependent source. (10 marks) (b) Calculate the forward current caused by 0·8 V forward volta…

(a) (i) For the circuit shown in Figure 2(a)(i), initial current through the coil is zero. The switch is closed at time t = 0. Find the time domain expression of current flowing t…

A common-emitter amplifier circuit is shown in Figure 3(a). Neglect r_x and r_o and assume the current source to be ideal. (i) Derive an expression for the midband gain. (ii) Deri…

For the network shown in Figure 4(a)(i) and its excitation function shown in Figure 4(a)(ii), find the response v(t) using convolution by: (i) 's' domain approach. (ii) time domai…

(a) The diagram of Master-Slave S-R flip-flop and the waveform applied to the Master flip-flop is shown in Figure 5(a). Draw the waveform that appears at the output of Slave flip-…

(a) The plane wave E = 30 cos (ωt – z) aₓ V/m in air normally hits a lossless medium (μ = μ₀, ε = 4ε₀) at z = 0. (i) Find reflection coefficient (Γ), transmission coefficient (τ),…

(a) A three-phase, 5 kW, 440 V, 6 pole, star connected synchronous motor having negligible stator resistance and synchronous reactance of 6 Ω is operated at 0·8 rated power factor…

(a) (i) Differentiate between the functions of Decade counter and BCD counter with example. (10 marks) (ii) Draw the diagram of cascading BCD adders to add two three-digit decimal…

(a) A closed-loop system is shown in the figure below. The maximum overshoot for the system is 40% and the peak time is 2 seconds. Calculate the values of A and B. Consider J = 1…

(a) A unity feedback system is shown in the figure below. Determine the range of α for which the system is stable and the steady-state error for unit step input is less than 5% :…

(a) (i) The figure below shows a schematic diagram of shunt ohmmeter. It consists of a battery in series with an adjustable resistance R1 and a d.c. measuring PMMC ammeter. The un…

(a) (i) List various interrupts in microprocessor 8085 in order of decreasing priority. Specify which of these are edge-sensitive and which are level-sensitive. Explain why TRAP i…

(a) Determine the inductance of a single-phase transmission line consisting of three conductors of 2 cm radii in the 'go' conductor and two conductors of 4 cm radii in the 'return…

(a) A three-phase, 50 Hz transmission line is 400 km long. The voltage at the sending end is 220 kV. The line parameters are r = 0.125 Ω/km, x = 0.4 Ω/km and y = 2.8 × 10⁻⁶ mho/km…

(a) The figure below shows the encoder for a rate r = 1/2, constraint length k = 4 convolutional code : [Figure: input feeding three flip-flops in cascade, an upper modulo-2 adder…

(a) Answer the following : (i) Write the recommended expression for time-current relationship of standard IDMT relay and draw its characteristic curve. Why is this type of relay c…