Rajiv Gandhi Proudyogiki Vishwavidyalaya 2010 B.E Mechanical Engineering ThermalEngg - Question Paper
2010 Rajiv Gandhi Proudyogiki Vishwavidyalaya(Technical University) B.E Mechanical Engineering MODEL ques. PAPER - 2010, RGPV, Bhopal, ThermalEngg. ques. paper
Use constant properties of gases at 300K
ques. (1)
ans the subsequent
(a) What is the difference ranging from work transfer and heat transfer?
(b)Classify the subsequent processes as heat or work. provide 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 1st legal regulations of thermodynamics.
ques. (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. obtain 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 obtain the density of the air as it enters the diffuser.
ques. (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.
ques. (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.
2008 Rajiv Gandhi Proudyogiki Vishwavidyalaya(Technical University) B.E Chemical Engineering B.e.3rd sem thermodynamics Question paper
B. E 3rd Semester APPLIED THERMODYNAMICS I 2008
Note: Section A is compulsory. Attempt any Four questions from Section B and
two from Section
C.
Section A Marks 2 each
(a) What is a steam accumulator and its function?
(b) What are the ideal working fluids for binary vapour cycle. Give reasons.
(c) What are boiler mountings and accessories? Differentiate.
(d) Define supersaturated flow.
(e) What is condition curve? Discuss.
(f) What are back pressure and extraction turbines? Illustrate.
(g) What is isothermal efficiency of a compressor?
(h) Define vacuum efficiency of a condenser.
(i) List the various losses taking place in a steam turbine.
(j) What is meant by overall efficiency of a turbine?
Section B Marks 5 each
2. Describe 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? Describe briefly velocity
compounding.
6. Describe the methods of attaching blades to turbine rotor.
Section C Marks 10 each
7. Describe 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 1 bar and 15oC
and compressor in 70 s raises the pressure in 2 m3 receiver to 7.5 bar and
temperature is 40oC, what is
the volumetric efficiency of compressor?
Assume initial pressure and temperature in the receiver to be 1 bar and 15oC.
| Earning: Approval pending. |
