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June 13th, 2014, 11:01 AM
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JNTU B.Tech in Electrical and Electronics Engineering-Power Systems-I previous year's
Can you please give me the JNTU B.Tech in Electrical and Electronics Engineering-Power Systems-I previous year's question paper? As you want to get the JNTU B.Tech in Electrical and Electronics Engineering-Power Systems-I previous year's question paper so here is the information of the same for you: 1. Draw the complete schematic diagram of a coal fired thermal power plant. Label each component. Discuss briefly the function of each component. [16] 2. (a) What are the functions of moderator and control rods in a nuclear power plants. (b) Distinguish between thermal and fast reactors. Classify each according to moderator, coolant and fuel utilized. [8+8] 3. (a) Distinguish between primary and secondary distribution systems with suitable examples. (b) A 2-wire DC distributor AB, 600m long as loaded as under: Distance from A (mts) : 150 300 350 450 Loads (Amps) : 100 200 250 300 The feeding point A is maintained at 440V and that of B at 430V. If each conductor has a resistance of 0.01 per 100m, calculate i. the currents supplied from A to B ii. the power dispatched in the distributor. [8+8] 4. A three-phase distribution system power is supplied at 11 kV (line voltage) and balanced load of 50 A/phase at 0.8 lagging p.f and 70 A at 0.9 lagging p.f are taken at Q and R respectively. The impedance of the feeders are PQ = (5+j9), QR = (6+j10) and RP = (4+j8). Calculate the voltage at Q and R and the current in each branch. Power factors are assumed with respect to voltage at P. [16] 5. Briefly discuss the classification of substations. [16] 6. (a) Why Voltage control and p.f. correction are necessary in power systems? What are the disadvantages of low voltage and low p.f. of the system (b) A 400V, 50 cycles, three phase line delivers 207 kW at 0.8 p.f.(lag). It is desired to bring the line p.f. to unity by installing shunt capacitors. Calculate the capacitance if they are i. star connected ii. delta connected. [8+8] 7. (a) Define the following: i. Connected load ii. maximum demand iii. demand factor. (b) A power supply is having the following loads. Type of load Max.demand(KW) Diversity of group Demand factor Domestic 15,000 1.25 0.7 Commercial 25,000 1.2 0.9 Industrial 50,000 1.3 0.98 If the overall system diversity factor is 1.5, determine i. the maximum demand ii. connected load of each type. [8+8] 8. (a) Discuss the flat rate and block rate tariffs. (b) A power station has an installed capacity of 20,000KW. The cost of the station is Rs. 1,200/kW. The fixed costs are 13% of the cost of investment on full load at 100% load factor, the variable costs of the station per year is 1.5 times the fixed costs. Assume that there is no reserve capacity of the plant and that are variable costs and proportional to energy production. Find the cost of generation per KWh at load factor of 100% and 20%. Comment on the results. [8+8] ? 1. Draw a general layout of a modern thermal power plant and explain the working of different circuits. [16] 2. (a) Explain the function of moderator. How is a moderator selected? Why does a breeder reactor require no moderator? (b) Discuss the boiling water reactor, mentioning its merits and demerits. [10+6] 3. (a) Discuss briefly the requirements of a distribution system (b) A 2-wire DC ring distributor is 300m long and is fed at 240V at point A. At point B, 150m from A, a load of 120A is taken and at C, 100m in the opposite direction, a load of 80a is taken if the resistance per 100m of single conductor is 0.03, find i. current in each section of distributor ii. voltage at points B and C. [8+8] 4. A 3-phase distribution system is shown in figure 4 Power is supplied at A at line voltage of 6.6 kV and balanced loads of 25A per phase at 0.8 lagging p.f and 35A per phase at 0.9 lagging p.f are taken at B and C respectively. The impedances of the feeders are AB = (5 + j9) , BC = (6 + j10) and CA = (4 + j8) . Calculate the voltage at B and C and the current in each branch p.f.’s are assumed w.r. to voltage at A. [16] 5. (a) What are the different types of bus bar arrangements? (b) Explain the single bus bar system with sectionalization and what its merits are as well as demerits. [6+10] 6. (a) Why the improvement of power factor is very important for both consumers and generating stations? List the various causes of low power factor and explain. (b) A single-phase motor takes a current of 10 amps at a p.f. of 0.707 lagging from a 230 V, 50 Hz supply. What value must a shunting capacitor have to raise the p.f. to unity. [8+8] 7. (a) Discuss the role of load factor on the cost of electrical energy. (b) From a load duration curve, the following data are available: the maximum demand on the system is 25 MW. The load supplied by two units is 15 MW and 12.5 MW. Unit no.1 acts as a base load unit and No.2 as a peak load unit. The base load unit works for 100% of the time and peak load unit for only 40% of time the energy generated by unit No.1 is 1 ×108 units and that by No.2 is 1×107 units. Determine the load factor, plant capacity factor and plant use factor of each unit and load factor of the total plant. [6+10] 8. What are the factors influencing tariff design and explain the various types of tariffs in detail. [16] ? Contact Details: Jawaharlal Nehru Technological University Main Road, Kukatpally Housing Board Colony, Kukatpally, Hyderabad, Andhra Pradesh 500085 040 2315 8661 India Map Location: Last edited by Neelurk; April 13th, 2020 at 03:53 PM. |
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