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727.

For the op-amp circuit shown in Fig, determine the output voltage v₀. Assume that the op-amps are ideal.

[5 marks]

asked in Electrical Engineering, 2001

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728.

For the ring counter shown in Fig, find the steady state sequence if the initial state of the counters is 1110 (i.e., Q₃,Q₂,Q₁,Q₀=1110). Determine the MOD number of the counter.

[5 marks]

asked in Electrical Engineering, 2001

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729.

Given the characteristic equation
s³ + 2s² + Ks + K = 0
Sketch the root locus as K varies from zero to infinity. Find the angle and real axis intercept of the asymptotes, break-away/break-in points, and imaginary axis crossing points, if any.
[5 marks]

asked in Electrical Engineering, 2001

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730.

A unity feedback system has an open-loop transfer function of
G(s) = 10000/[s(s+10)²]
(a) Determine the magnitude of G(jω) in dB at an angular frequency of ω=20 rad/sec.
(b) Determine the phase margin in degrees.
(c) Determine the gain margin in dB.
(d) Is the system stable or unstable?
[5 marks]

asked in Electrical Engineering, 2001

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731.

A power system has two generators with the following cost curves:
Generator 1 : C₁(P_G1) = 0.006(P_G1)² + 8P_G1 + 350 (Thousand Rupees/Hour).
Generator 2 : C₂(P_G2) = 0.009(P_G2)² + 7P_G2 + 400 (Thousand Rupees/Hour)
The generator limits are
100 MW ≤ P_G1 ≤ 650 MW
50 MW ≤ P_G2 ≤ 500 MW
A load demand of 600 MW is supplied by the generators in an optimal manner. Neglecting losses in the transmission network, determine the optimal generation of each generator.
[5 marks]

asked in Electrical Engineering, 2001

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732.

A single line-to-ground fault occurs on an unloaded generator in phase a positive, negative, and zero sequence impedances of the generator are j0.25 p.u., j0.25p.u., and j0.15 p.u. respectively. The generator neutral is grounded through a reactance of j0.05 p.u. The prefault generator terminal voltage is 1.0 p.u.
(a) Draw the positive, negative, and zero sequence networks for the fault given.
(b) Draw the interconnection of the sequence networks for the fault analysis.
(c) Determine the fault current.
[5 marks]

asked in Electrical Engineering, 2001

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