APPLIED THERMODYNAMICS PAPER 2

DOWNLOAD PREVIOUS YEARS MECHANICAL ENGINEERING QUESTION PAPERS B.TECH PTU SECOND YEAR

APPLIED THERMODYNAMICS ME 207/209 B Tech 3rdSem May 2k7
Instructions to Candidates:

1. Section A is compulsory.
2. Attempt any Four questions from Section B
3. Attempt any Two questions from Section C

Section A
( 10 x 2 =20)

1.

1. What is a pure substance?
2. What is sensible heat, explain.
3. What is the optimum pressure of modern high-pressure boiler?
4. Name the two fluids of binary cycle
5. Why compounding of turbines is essential?
6. What is degree of under-cooling?
7. What is reheat factor?
8. What is degree of reaction?
9. Write three uses of compressed air.
10. What is function of condensing plant?

Section B
( 4 x 5 =20)

2. Using steady flow energy equation of nozzle derive the relation of critical pressure ratio for maximum discharge.

3. Steam with absolute velocity of 300 m/s is supplied through a nozzle to a single stage impulse turbine. The nozzle angle is 25o . The dia of the rotor is 1 m and has speed 2000 r.p.m. Find blade angle for zero axial thrust. If the blade velocity coefficient is 0.9 and steam flow rate is 10 kg/s calculate power.

4. Differentiate between impulse and reaction turbine.

5. Derive the maximum diagram efficiency of a reaction turbine.

6. What is a fusible plug and state where it is located in a boiler.

Section C
( 2 x 10 =20)

7. (a) A 2-stae compressor is used to compress from 1.0 bar to 16 bar. The compression is as per the law pv1.25. The temperature of air at inlet of compressor is 300K. Neglecting the clearance and assuming perfect inter-cooling, find the indicated power in kW to deliver 5 m3/min air measured at inlet conditions and find intermediate pressure also.
(b) Explain the effects of air leakage in a condenser.

8. With the help neat sketch, explain the working of Babcock and Wilcox boiler and its essential features.

9. Ina single heater regenerative cycle the steam enters the turbine at 30 bar, 400 oC and exhaust pressure is 0.1 bar. The feed water heater is a direct contact type which operates at 4 bar. Find
(a) efficiency
(b) steam rate of the cycle.