Sathyabama University: Thermal System 2013 Sub Code - 616504 B.E Degree Examination Question Paper

Register Number

SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act,1956)

Course & Branch :B.E - M&P
Title of the Paper :Thermal System Max. Marks:80
Sub. Code :616504(2007/2008/2009) Time : 3 Hours
Date :27/09/2013 Session :FN
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                                       PART - A                    (10 x 2 = 20)
                        Answer ALL the Questions
1. Differentiate boiler accessories and boiler mountings.

2. What is the use of moderator in nuclear power plant?

3. What is meant by free air delivered?

4. Name some of the important refrigerant.

5. Differentiate air refrigeration and vapour compression system.

6. Explain the use of throttle valve in refrigeration.

7. State the function of carburetor.

8. What are methods of governing IC engines?

9. Write the three dimensional conduction equation.

10. Define overall heat transfer co efficient.


PART – B   (5 x 12 = 60)

Answer All the Questions

11. Briefly explain the working of Babcock and Wilcox boiler.
(or)
12. Draw and explain hydro power plant?

13. A two stroke single acting reciprocating compressor draws air at a Pressure of 1 bar and 170C and compresses it to a pressure of 60 bar. After compression in the LP cylinder, the air is cooled at a constant pressure of 8 bar to a temperature of 370C. The Lower pressure cylinder has a diameter of 150 mm and both the cylinders have 200 cylinder has a diameter of 150 mm and both the cylinders have 200 mm stroke. If the law of compression is pv 1.3=C. Find the power of the compressor, when it runs at 200 rpm. Take R=287J/kgK.
(or)
14. Draw and explain the screw type compressor.

15. A refrigerator of 6 tons capacity working on the Bell-Coleman cycle has an upper limit of pressure of 5 bar. The pressure and temperature at the start of the compression are 1 bar 15oC respectively. The compressed air is cooled at the constant pressure to temperature of 40oC enters the expander cylinder. Assumed both expansion and compression processes to be isentropic γ = 1.4, calculate (i) C.O.P (ii) Quantity of air circulation per min (iii) Piston displacement of the compressor and expander. The refrigerating unit runs at 240 rpm and its drive the unit. For air take Cp = 1.005kj/kg k.
(or)
16. Draw and explain the Vapour compression refrigeration system?

17. During the test on single cylinder oil engine, working on the four stoke cycle and fitted with a robe brake, the following reading are taken:
      Effective diameter of brake wheel = 630 mm; Dead load on brake =200 N; Spring balance reading =30 N; Speed = 450 r.p.m; Area of the indicator diagram = 420 mm2; Length of indicator diagram = 60 mm ; Spring scale =1.1 bar per mm ; Diameter of cylinder 100 mm ; Stroke length = 150 mm ; Quantity of oil used = 0.815 kg/hr ; Calorific valve of oil = 42000 kj/kg. Calculate Brake power, indicated power, mechanical efficiency and Brake thermal efficiency.
(or)
18. Draw and explain any one of lubrication Method with diagram.

19. A furnace wall is composed of 220 mm of brick, 150 mm of common brick, 50 mm of 85% magnesia and 3 mm steel plate on the outside, if the inside surface temperature is 1500 o C and outside surface is 90 o C  estimate the temperature between layers and calculate the heat loss in kj/hr m2 Assume K(for fire brick) = 4 kj/m hr o C, K(for common brick) = 2.8 kj/m hr o C, K(for 85% magnesia) = 0.24 kj/m hr o C  and K(Steel) = 240 kj/m hr o C.
(or)
20. Explain the followings:
(a) Steady and unsteady state heat transfer
(b) Tranmitivity
(c)  Conductivity
(d) Emissive power of black body.

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