SPPU Question Papers
Class: BE Mechanical (2015 Course)
Subject: Energy Engineering
Unit 1 B: Thermal Power Plant
March 2016
Q. 3. a) What do you
understand by coal beneficiation? [5 marks]
May 2016
Q. 2. a) Explain with
neat sketches mechanical dust collectors. [6 marks]
Q. 2. b) Draw a neat
diagram of fluidized bed boiler. Discuss its merits and demerits. [4 marks]
December 2016
Q. 2. b) With a neat sketch,
explain ash handling system. [4 marks]
March 2017
Q.
3. a) Draw Rankine cycle with reheat and regeneration on T-S Plane. [4 marks]
(OR)
Q. 4. a) Explain the
analysis of cogeneration plants. [5 marks]
May 2017
Q. 1. b) Explain the
following: [6 marks]
i) Dust Collector
ii) Coal-Oil Mixture
(OR)
Q.
2. a) What is FBC? Explain with neat sketch. [6 marks]
Q.
3. b) A steam power plant operating on Rankine cycle receives steam from a
boiler at 3.5 MPa and 350°C. It is
exhausted to condenser at 10 kPa.
Calculate:
i) Energy supplied per kg of steam
generated in boiler
ii) Quality of steam entering the
condenser
iii) Rankine cycle efficiency
considering feed pump work. [6 marks]
December 2017
Q.
1. b) Explain essential properties of coal required for thermal power plant. [4
marks]
(OR)
Q.
2. b) Explain coal beneficiation. [4 marks]
Q.
3. a) Describe fluidized bed combustion system. [4 marks]
(OR)
Q.
4. a) Explain salient features of high pressure boilers. [4 marks]
March 2018
Q.
2. a) Explain essential properties of coal required for thermal power plant. [4
marks]
Q.
3. a) Explain ash handling system with neat sketch. [4 marks]
Q.
3. b) In two stage steam turbine working on ideal Rankine cycle, steam enters
the first stage at 90 bar & 550°C
temperature. Second stage entry temperature after reheating is 550°C. Steam is never wet during expansion in both sides.
Find the cycle efficiency and
specific steam consumption. Also find the steam flow rate in the turbine in kg/sec if the turbine is
directly connected to an alternator of 150 MW
output. Assume 0.9 as alternator efficiency. Draw T-S diagram for the cycle. Neglect pumps work. [6 marks]
(OR)
Q.
4. a) Discuss factors to be considered in selecting the site of thermal power
plant. [4 marks]
Q.
4. b) In a reheat cycle, steam at 500°C expands in a HP turbine till it is
saturated vapor. It is reheated
at constant pressure to 400°C and then expands in a LP turbine to 40°C. If the maximum moisture content at
turbine exhaust is limited to 15%,
Determine:
i) Reheat pressure
ii) Boiler pressure
iii) Cycle efficiency
iv) Steam rate. [6 marks]
May 2018
Q.
3. a) Describe the four major circuits in a thermal power plant. [4 marks]
(OR)
Q. 4. a) With neat
sketch, explain different types of wet dust collectors. [4 marks]
December 2018
Q.
3. a) What are the good requirements of coal handling plant? [4 marks]
Q.
3. b) Steam at a pressure of 15 bar and 250°C is expanded through a turbine at
first to a pressure of 4 bar. It is then
reheated at constant pressure to the initial temperature
of 250°C and is finally expanded to 0.1 bar. Draw the T-S diagram and estimate the work done per kg of
steam flowing through the turbine and amount
of heat supplied during the process of reheat. Compare the work output when the expansion is direct from 15 bar
to 0.1 bar without any reheat. Assume all expansion
processes to be isentropic. [6 marks]
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