Rajiv Gandhi Proudyogiki Vishwavidyalaya 2008 B.E Chemical Engineering Thermodynamics - Question Paper
2008 Rajiv Gandhi Proudyogiki Vishwavidyalaya(Technical University) B.E Chemical Engineering B.e.3rd sem thermodynamics ques. paper
B. E third Semester APPLIED THERMODYNAMICS I 2008
Note: part A is compulsory. Attempt any 4 ques. from part B and 2 from part
C.
part A Marks two every
(a) What is a steam accumulator and its function?
(b) elaborate the ideal working fluids for binary vapour cycle. provide reasons.
(c) elaborate boiler mountings and accessories? Differentiate.
(d) describe supersaturated flow.
(e) What is condition curve? explain.
(f) elaborate back pressure and extraction turbines? Illustrate.
(g) What is isothermal efficiency of a compressor?
(h) describe vacuum efficiency of a condenser.
(i) List the different losses taking place in a steam turbine.
(j) What is meant by overall efficiency of a turbine?
part B Marks five every
2. define spring loaded safety valve with the help of a diagram.
3. A boiler produces 8.9 kg of steam per kg of coal from feed water at 45oC. The pressure of the steam
is 10.5 bar. And dryness fraction 0.96. What is equivalent evaporation from and at 100oC per kg of
coal?
4. Dry saturated steam at 3.5 bar having negligible velocity expands in a convergent nozzle to 1.3 bar
and dryness fraction 0.94.Calculate velocity of steam leaving nozzle.
5. What is compounding and its advantages? define briefly velocity compounding.
6. define the methods of attaching blades to turbine rotor.
part C Marks 10 every
7. define Stirling boiler with the help of a neat diagram giving its construction and working.
8. A De-Level turbine is supplied 15 kg/min of steam with a velocity of 1000 m/s. The nozzle angle is
20oC. Mean blade velocity is 400 m/s and inlet and outlet angles of blades are equal. Find:
(a) Blade angles
(b) Tangential force on blades
(c) Power developed.
9. The piston of an air compressor has a displacement of 12 m3/min. If air intake is at one bar and 15oC
and compressor in 70 s raises the pressure in two m3 receiver to 7.5 bar and temperature is 40oC, what is
the volumetric efficiency of compressor?
presume initial pressure and temperature in the receiver to be one bar and 15oC.
2010 Rajiv Gandhi Proudyogiki Vishwavidyalaya(Technical University) B.E Mechanical Engineering MODEL QUESTION PAPER - 2010, RGPV, Bhopal, ThermalEngg. Question paper
Use constant properties of gases at 300K
QUESTION (1)
Answer the following
(a) What is the difference between work transfer and heat transfer?
(b)Classify the following processes as heat or work. Give reasons.
-Temperature rise of a gas in a cylinder when it is
compressed by the piston.
-Heating of a room when an electric iron is plugged in.
-Solar heating of a room.
-Heating of an insulated room by burning candles.
(c)Write the statement of First law of thermodynamics.
QUESTION (2)
(i)Nitrogen at an initial
state of 300 K, 150 kPa and 0.2 m3 is compressed by an adiabatic process to a
final pressure of 800 kPa. Find the total work done.
(ii) Air at a flow rate of 4.2 kg/m3 leaves a diffuser that has an exit to
inlet area ratio of 2:1 with a velocity of 120 m/s. It enters the diffuser with
a velocity of 380 m/s find the density of the air as it enters the diffuser.
QUESTION (3)
.
A mass of 15kg of air in a
piston cylinder device is heated from 250C to 770C by passing current through a
resistance heater inside the
cylinder. The pressure inside the cylinder is kept constant at 300kPa during
the process and a heat transfer of 60KJ occurs from the device to the
surroundings. Determine the electrical energy supplied.
QUESTION (4)
Liquid water at 300 kPa and 20oC enters a mixing chamber a rate of 1.8 kg/s
where it is mixed with superheated steam at 300 kPa and 300oC. If the mixture
leaves the mixing chamber at 60oC, determine the mass flow rate of the super
heated steam.
| Earning: Approval pending. |
