Subject 2018 Question Paper — Government College of Engineering and T…

Instructions

• Attempt any five questions in all selecting at least two questions from each Section.
• Each question carries 20 marks.
• Assume missing data wherever necessary.
• Use of Mollier Charts and steam table is allowed.

Questions

Section - A

Attempt at least two questions from this Section.

• Q1. A steam power plant , pertaining with one regenerative feed water heating is run at the initial steam conditions of 35.0 bar and $440^0$ C with exhaust pressure of 0.040 bar. Steam is bled from the turbine for feed water heating at a pressure of 1.226 bar. Determine (i) Specific heat consumption (ii) Thermal efficiency of the cycle (iii) Economy percentage compared with the cycle of a simple condensing power plant. [20 marks]
• Q2. A horizontal shaft, propeller type wind-turbine is located in area having speed of wind $10\text{ m/s}$ at $1\text{ atm}$ and $15^{\circ}$ C. Calculate the following: (i) Air density $\rho$ (ii) Total power density in wind stream, $\text{W/m}^2$ (iii) Maximum possible obtainable power density, $\text{W/m}^2$ (iv) Actual obtainable power density, $\text{W/m}^2$ (v) Total power from a wind-turbine of $120\text{ m}$ dia. [20 marks]
• Q3. Explain the various types of condensers with neat sketches. Give the importance of using condensers in the power plant. [20 marks]
• Q4. (a) What is depreciation. Explain the sinking fund method of calculating the depreciation. (b) Explain the factors to be considered for site selection of Hydroelectric Power Plant. [20 marks]
• Q5. Explain the economics of power plants in terms of power selection and power generation. [20 marks]
• Q6. What is the difference between water-tube and fire tube boilers? Describe the working principle of Cochran Boiler. [20 marks]
• Q7. A 2-cylinder C.I. engine with a compression ratio 13:1 and cylinder dimensions of $200\text{ mm} \times 250\text{ mm}$ works on two stroke cycle and consumes $14\text{ kg/h}$ of fuel while running at $300\text{ r.p.m.}$ The relative and mechanical efficiencies of engine are $65\%$ and $76\%$ respectively. The fuel injection is affected up to $5\%$ of stroke. If the calorific value of the fuel used is given as $41,800\text{ Kj/kg}$.Calculate the mean effective pressure developed. [20 marks]
• Q8. Write short notes on any two of the following: (a) CANDU reactor (b) Geothermal energy (c) Fuel-Cell [20 marks]