# CSVTU Exams Questions Papers – BE I Year – Basic Mechanical Engineering – May- 2008

BE (2nd Semester)

Examination May-2008

Basic Mechanical Engineering

UNIT- I

1. (a) Define work and heat.

(b) Show that work is a path function.

(c) A piston and cylinder machine contains a fluid system which passes a complete cycle of four processes. During a cycle, the sum of all heat fers is 170 kJ. The system, completes 100 cycles per min. Complete following table.

Process            Q (kJ/min)               W (kJ/min)                 (kJ/min)

a-b                       0                                 2,170                           ?

b-c                   21,000                          0                                 ?

c-d                   -2,100                             ?       36,600

d-a                       ?                                  ?                                 ?

UNIT- II

2. (a) Define entropy.

(b)Show that entropy is a point function.

(c) Show that =  notto= 1- 1/r kr-1

UNIT- III

3. (a) What is Dryness fraction ?

(b) A vessel of volume 0.04 m3 contains a mixture of saturated water and rated steam at a temperature of 250?C. The mass of the liquid present is Find the pressure, the mass, the specific volume, the enthalpy, the and internal energy.

(c) What is Blow-of-cock ? Describe it with neat sketch.

UNIT- IV

4. (a) Define Welding.

(b) What is oxy acetylene gas welding? Describe different types of oxy- acetylene welding flaming.

(c) What are the classifications of Lathe? Describe engine lathe.

UNIT- V

5. (a) Define Stress and Strain.

(b) Show stress and strain diagram for ductile and brittle material.

(c)Show that:

?/K= 3?/E[1-2/m]

where K is Bulk modulus, E is Young’s modulus of elasticity is 1/m Poisson’s ratio.