ME 2202 ENGINEERING THERMODYNAMICS FOURTH UNIT EXAMINATIONS

B.E./B.TECH.DEGREE FOURTH UNIT EXAMINATIONS, SEPTEMBER - 2012

REGULATIONS 2008

SECOND YEAR / THIRD SEMESTER

ME 2202 ENGINEERING THERMODYNAMICS

MECHANICAL ENGINEERING

Time: 90 MINUTES                             Date:   22.09.2012                              Maximum:50 marks

ANSWER ALL QUESTIONS

                                                                   PART – A                        (9 x 2 =18 marks)

1.     What is Pure substance?

2.     Define the terms boiling point and Melting point.

3.     State phase rule of  pure substances.

4.     Explain the terms: Degree of superheat, Degree of sub cooling.

5.     Mention the change of  phase of  water in a diagram.

6.     Mention the advantages of superheated steam.

7.     Draw the P-V-T surface of  water and also indicate its salient features.

8.     Define latent heat of evaporation.

9.     Define latent heat of ice.

                                                       PART – B                        (2 x 16 =32 marks)

ANSWER ANY TWO QUESTIONS

10.                        Define the following terms pertaining to pure substances like water:

a)     Quality of steam & Wetness Fraction

b)    sensible heating & Latent heating

c)     Triple point & Critical point

d)    critical pressure & critical temperature

e)     saturation temperature & saturation pressure

f)      saturated liquid & saturated vapour

g)     dry vapour & wet vapour

h)     superheated steam & Degree of super heat.

11.                        Draw any one of the following diagram of a pure substances and explain various regions of the diagram in detail.

a)     P - v diagram

b)    P - T diagram

c)     T - v diagram

d)    T - S diagram

e)     h - S diagram

12.  Steam at 1 MPa and 0.9 dry is throttled to a pressure of 200 KPa. Using steam table, find the quality of steam and change in entropy. Check your answer using Mollier chart. State whether this process is reversible or irreversible.