HVDC
1. (a) Compare AC and DC transmission systems.
(b) With neat sketch the different kinds of D.C links available
2. (a) Explain the technological development in control and protection for better performance and
reliability of D.C transmission system.
(b)What are the advantages and disadvantages of HVDC transmission system?
3. (a) Draw the schematic circuit diagram of a 12-pulse Graetz’s circuit and explain its principle of
Operation.
(b) Discuss in detail, the control characteristics of converter.
4. (a) With circuit diagram, explain the principle of operation of firing angle control scheme.
(b) Explain the conventional control strategy employed in HVDC system.
5. (a) With block diagram, discuss the principle of operation of a basic power controller.
(b) Discuss the various sources of reactive power for HVDC converters.
6. (a)Explain the conventional control strategy employed in HVDC system.
Write short notes on the following,
(b) Constant alpha control
(c) Inverse cosine control.
NNFL
1. (a) Explain the structure of the human brain?
(b) Explain Hodgkin-Huxley neuron model?
2. (a) Distinguish between single layer and multi layer feed forward networks?
(b) Explain about Reinforced learning?
3. (a)Explain about multi category single layer perceptron model?
(b) Compare and Contrast Supervised and Unsupervised learning strategies?
4. (a) State and prove Kolmogorovs theorem?
(b) Explain about Mc.Culloch Pitt’s neuron model?
5. (a) Write SCPTA?
(b) Draw the flow chart for Perceptron training algorithm?
6. (a) State and prove Perceptron Convergence theorem?
(b) Describe Widrow-Hoff learning rule?
EHVAC
1.(a)What are the important and useful conclusions can be drawn for preliminary understanding of trends relating to power-handling capacity of a.c. transmission lines and line losses?
(b) Explain the different types of vibrations and oscillations presented in EHV transmission lines. Describe the measures taken to minimize the damage due to them.
2.(a) Derive the expression for Single-phase line inductance calculation and Multi-conductor line for calculation of Maxwell's potential coefficients.
(b) Describe the properties of bundled conductors in EHV lines
3. Explain the following
(a) Maximum surface voltage gradient of bundle with more than 3 sub conductors.
(b) Explain the audible Noise frequency spectra for ac and dc transmission lines. Also give the limits for audible noise.
4(a) Define compensation and explain Cascade connection of components of shunt series compensation with generalized equations and chain rule.
( b) How the VOLTAGE CONTROL is done Using Synchronous Condensers?
5 (a) Derive and explain different corona loss formulae use in E.H.V A.C lines.
(b) A single circuit 3 phase, 50 Hz, 400kV line has a series reactance per phase of
0.327Ω/km. Neglect line resistance. The line is 400km long and the receiving end
load is 600MW at 0.9 power factor lag. The positive sequence line capacitance is
7.27nF/km. Suggest suitable reactive compensation equipment to be provided at the
load and to maintain 400kV(1 p.u. voltage) at both ends of the line. The base
quantities for calculation are 400kV, 1000MVA.
6(a) Describe the diagonalization procedure of transmission line inductance matrix and also explain the significance of eigenvector interpretation.
(b) Give Power-Handling Capacity and Line Loss for different Transmission lines.
(c) Among HVAC and DC Transmission which one is best transmission, also mention the advantages and disadvantages of it.
