Enrollment No. / ID No.: ____________________
THE CHARUTAR VIDYA MANDAL UNIVERSITY
B. Tech. – SEMESTER - 2 INTERNAL THOERY EXAMINATION – MAY 2023
202001202: BASIC MECHANICAL ENGINEERING
Date: 18/05/2023
Time: 10.00 AM to 11.00 AM
Maximum Marks: 20
Instructions:
1. Figures on the right indicate full marks.
2. Make the suitable assumption if required, do specify the same.
3. Use of steam table is permitted.
Q. 1 (A) Answer the Following. (Each question carries one mark).
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(i) An air conditioning system is installed in a Classroom. During testing of the air
conditioning system, the inside space of the classroom is under
observation/consideration. Out of the following which is the system boundary in case
of classroom under observation?
(a) Inside area of room (b) Wall (c) Outside area of room (d) Air inside the room
(ii) Thermodynamic property whose value does not depend on the mass of the system is
known as__________ property.
(a) Intensive (b) Extensive (c) Flow (d) Non-flow
(iii) heat rejected by the system is considered as __________and work done on the system
are considered as __________.
(a) positive, positive (b) positive, negative (c) negative, positive (d) negative, negative
(iv) During which process, the value of heat transfer is same as the value of change in
internal energy ?
(a) Constant Pressure Process
(b) Constant Temperature Process
(c) Reversible Adiabatic Process (d) Constant Volume Process
Q. 2 (A) Derive the equation of Work Done for the Isothermal Process.
(B) Derive the equation of efficiency of Otto cycle in terms of temperatures.
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(C) Mention the location and function of Pressure Gauge and Water Level Indicator.
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OR
(C) 5 kg of gas, occupying 2.0 m3 had an original temperature of 25˚C. It was then heated at [04]
constant volume until its temperature became 150˚C. How much heat was transferred to
the gas and what was its final pressure? Take Cv = 0.72 kJ/kg-K and R = 290 J/kg-K.
Q. 3 (A) Draw the p-v diagram for Carnot (Air) and Rankine (Vapour) cycle.
(B) Calculate air standard efficiency of diesel cycle having the compression ratio of 15 with
various cut off ratios 1.1, 1.7 and 2.2. Comment on the results. Take, γ = 1.4
(C) Derive the Mayer’s equation (Cp -Cv = R).
OR
(C) Determine enthalpy & volume of 2 kg of steam at a pressure 9.2 bar (abs.) when the
dryness fraction of the steam is 0.95.
Pressure Sat. Temp. Specific Volume, m3/kg Specific Enthalpy, kJ/kg
in bar
in OC
vf
vg
hf
hfg
hg
9.0
175.4
0.001121
0.21482
742.6 2029.5 2772.1
9.2
176.3
0.001123
0.21037
746.8 2026.2 2773.0
* * * * * * * * ALL THE BEST * * * * * * * *
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