III B.Tech I Semester Supplimentary Examinations, May/Jun 2009 POWER SYSTEMS-II (Electrical & Electronic Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What do you understand by the constants of an over head line?
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(b) Derive an expression for the loop inductance of a single phase line. Also calculate loop inductance per km if distance between conductors is 1.5 mtr and radius of each conductor 1.2 cm. [4+12] 2. (a) Derive an expression for the capacitance between conductors of a single phase line. Deduce the expression for line to neutral capacitance. Discuss the approximation involved in deriving the above expressions.
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(b) A 400 KV, 3-phase single circuit bundled conductor line with two sub-conductors per phase has a flat configuration. The center to center distance between adjacent phases is 4m and distance between sub-conductors of phase is 45 cm. The radius of each sub-conductor is 1.6 cm . Find the capacitance per phase per km. (Given D12 =D23 =D31 =4m). (figure 2b). [8+8]
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3. (a) Discuss the effect of load power factor on voltage regulation and efficiency of a transmission line.
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(b) What is skin and proximity effects?
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(c) A 10km long 3 phase line delivers 1 MW at 0.8 lagging power factor. The series impedance of the line is 0.5 +j0.56 ohms per km per phase. The ending end voltage is 11 KV. Find the line current, receiving end voltage and transmission efficiency. [4+4+8]
4. In a 5 insulator disc string capacitance between each unit and earth is 1/6 of the mutual capacitance. Find the voltage distributions across each insulator in the string as percentage of voltage of the conductor to earth. Find string efficiency. How is this efficiency affected by rain. [16] 5. (a) What is a sag-template? Explain how this is useful for location of towers and stringing of power conductors. (b) What is a stringing chart? Explain clearly the procedure adopted for stringing the power conductors on the supports. [8+8] 1 of 2
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Code No: NR310203 6. (a) Explain the method of intersheath grading of cables.
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(b) A single core lead covered cable is to be designed for 66 kv to earth. Its conductor radius is 0.5 cm and its three insulating materials A, B, C have relative permittivities of 4,4,2.5 with maximum permissible stresses of 50,40,30 kv/cm respectively. Find the minimum internal diameter of the lead sheath. [8+8] 7. (a) What is a phase advancer? For which application this is used? (b) Explain in detail the operation of a phase advancer. (c) A factory load consists of the following
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i. an Induction Motor of 40 HP, with 0.8 p.f. and efficiency 0.85 ii. a synchronous motor of 25 HP, with 0.9 p.f. leading and efficiency 0.9 iii. Lighting load of 10 KW at 0 p.f.
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Find the annual electrical charges if the tariff is Rs. 100 per KVA of maximum demand per annum plus 150 paise per KWH, assuming the load to be steady for 2000 hours in a year. [4+4+8] 8. (a) Explain the need for per unit method in power system calculations. (b) Explain how base quantities can be selected and derive the formula for base impedance.
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(c) A 3-phase unbalanced system currents are read as IR =150 A; IY =0 A; and IB =80 A. The phase sequence is RYB. Find all the three symmetrical components for the case. [4+4+8]
NR310203 III B.Tech I Semester Supplimentary Examinations, May ...
i. an Induction Motor of 40 HP, with 0.8 p.f. and efficiency 0.85 · ii. a synchronous motor of 25 HP, with 0.9 p.f. leading and efficiency 0.9 · iii. Lighting load of 10 ...
(a) Give an overview of C++ class structure? (b) Compare the ... What is the difference between the C++ standard library, and the C++ standard · template library ...
7. Write short notes on the following · (a) p.f. improvement by synchronous condenser · (b) importance of p.f. improvement. (c) Economics of p.f. improvement.
(b) Write the principle of gas analysis by thermal conductivity. [8+8] · 5. What are the various designs of manometers used to measure pressure. [16] · 6. A tank of ...
1. (a) Explain under what conditions can Fick's first law be used to solve diffusion · problem. (b) In a diffusion anneal, to what level should the initial temperature ...
(b) A hydraulic press has diameter of ram 200 mm and of plunger 40 mm. It is provided with a lever for applying force to the plunger. If the ratio of leverage.
(b) In what way C++ throw specification differs from throw clause in java. [8] · 8. Explain in detail the sequence control in ML. [16] · *****. 1 of 1. AjntuWorld.in.
III B.Tech I Semester Supplimentary Examinations, May/Jun 2009 · PETROCHEMICAL ENGINEERING · (Chemical Engineering) · Time: 3 hours · Max Marks: 80 · Answer any FIVE Questions · All Questions carry equal marks · ***** · 1. Explain Refining of Crude p
(b) Binary data is transmitted over a telephone line with usable bandwidth of. 2400 Hz using the FSK signaling scheme. The transmit frequencies are 2025.
1. Discuss in detail about the advantages of Robotics over other form of Automation ... Consider the three-link articulated robot of figure 5. Derive the forward ...
i. Which page will FIFO replace · ii. Which page will LRU replace · iii. Which page will second chance replace · (b) In a fixed-partitioning scheme, what are the ...
(b) The observed difference between the high and low water tide is 0.85meters, for · a proposed tidal site. The basin area is about 0.5sq. Km which can generate.
(ε)0.15 MPa. If the billet is 15 inches long and the extrusion is done through square dies without lubrication, Determine the force required for the operation. [8].
With glucose insulin model. Estimate insulin sensitivity, discuss in detail? [16] · 7. Discuss with characteristics, block diagram and mathematical equations of the ...
[8+8]. (b) Explain the working of a single stage impulse turbine. 8. (a) Enumerate the advantages and disadvantages of gas turbines. [8+8]. 1 of 2. AjntuWorld.in ...
(b) Describe various types of heat exchangers based on temperature ... (c) Explain the mechanism of heat transfer by radiation. [5+6+5] ... (a) Thermal diffusivity.
3. (a) Compute Discrete Fourier transform of the following finite length sequence ... (a) Explain how the analysis of discrete time invariant system can be obtained.
(a) Describe Vegards Law with examples. (b) Explain why alloy find more applications than pure metals? (c) Explain why if one element is highly electronegative ...
[8+8] · 7. (a) How will you prepare Thiophene? What are its chief uses? [5+3] · (b) What will happen when Quinoline and Isoquinoline are treated with alkaline.
(a) Power control of HVDC converters · (b) Starting and ... (b) Draw the flow chart for AC/DC load flow. ... (b) Discuss the various faults exist in converter station?
NR. II B.Tech I Semester Supplimentary Examinations, May/Jun 2009 ... (b) The electric vector E of an electromagnetic wave in free space is given by the.
[4x4=16] · (a) Scrotum · (b) Sex glands · (c) Fallopian tubes · (d) Seminiferous tubules. 7. What are Lymph Nodes? Discuss about the spleen with a neat structure.
4. (a) Use Warshall's algorithm to find the transitive closure of the relation [10+6] · R = {(1,2)(1,3)(1,4)(2,3)(2,4)(3,4)} · (b) Are the simple graphs with the following ...
