PTU, B.Tech, 1st Sem., Elements of Mechanical Engineering Exam Papers

Will you please provide me the PTU, B.Tech, 1st Sem., Elements of Mechanical Engineering Exam Previous Years Question Paper????

This is the PTU, B.Tech, 1st Sem., Elements of Mechanical Engineering Exam Previous Years Question Paper:

a) What do you mean by phase of a system?
b) What is meant by thermodynamic equillibrium?
c) Define enthalpy.
d) What do you understand by open system? ,
e) What is isothermal Process?
0 Define third law of thermodynamics.
g) What do you understand by a for-rr stroke engine?
h) Where do rve use Diesel CYcle?
i) Define ductilitY.
j) What is meant bY mechanisrn?

Section - B
(Msrks: 8 each)
Q2) What are state functions and how do they differ from path functions? Give
examples of each.

Q3) Ablower handles 1 kg/s of air at 20" C and consumes a power of 15kW. The
inlet and outlet velocities of air are 100 m/s and 150 m/s respectively. Find the
exit air temperature, assuming adiabatic conditions. Take cn of air as
1.005 kJ/kg-K.
Q4) Derive an expression for 1st law of thermodynamics applied to a closed
system. Define the internal energy of a system.
QS) If a refrigerator is used for heating plrrpose in winter so that the atmosphere
becomes the cold body and the room to be heated becomes hot body horv
much heat would be available for heating for each kW input to the driving
motor? The COP of the refrigerator is 5 and the electro mechanical efficiency
of the motor is 90o/o. How does this compare with resistance heating.
Section - C
(ll[urks: I cach)
Q6) Show that the efficiency of Otto cycle depends only on compression ratio"
Q7) F,xplain lateral strain. young's modulus of elasticity ancl stress - sirain curve.
Q8) Write notes on:
(a) Worm and worm wheel.
(b) Oldhani's coupling.
Q9) In an air standard Otto cycle the coixpression ratio 10, tire compression
begins at 37.8' Q, 1 bar and maximr.rm temperatule of tlte c1'cle is 1050"C .
l)etermine.
(a) The heat supplied per kg of air
(b) The work done per kg of air
(c) The nraxilllulrl pres-qure of tlie cycle and
(d) The tirermal elliciency.

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