Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem Old 141903 Engineering Thermodynamics Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (Old) EXAMINATION ? WINTER 2019
Subject Code: 141903 Date: 10/12/2019
Subject Name: Engineering Thermodynamics
Time: Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Differentiate between the following:
1. Statistical and classical thermodynamics
2. Open system and closed system
3. Intensive properties and extensive properties
07
(b) Explain first law of thermodynamics for closed system undergoing a cycle. 07
Q.2 (a) What is difference between heat and work? Show that heat is a path function
and not a property.
07
(b) Derive the steady flow energy equation for a single stream entering and a single
stream leaving a control volume and reduce it for turbine.
07
OR
(b) An engine manufacturer claims to have developed a heat engine with following
conditions: Power developed = 75 kW, fuel burnt = 5 kg/hour, heating value of
fuel = 73000 kJ/kg, temperature limits = 1000 and 400 K. is the claim of
manufacturer is true or false? Justify your answer.
07
Q.3 (a) Define COP. Prove that COPHP = COPR+1 07
(b) Prove equivalence of Kelvin-Planck?s and Clausius? statements. 07
OR
Q.3 (a) Show that the efficiency of a reversible engine operating between two given
constant temperatures is the maximum.
07
(b) A lump of steel of mass 10 kg at 627?C is dropped in 100 kg of oil at 30?C. the
specific heats of steel and oil are 0.5 kJ/kgK and 3.5 kJ/kgK respectively.
Calculate entropy change for steel, oil and the universe.
07
Q.4 (a) Derive expressions for availability of steady flow open system. 07
(b) With the help of schematic diagram, derive an expression for Rankine cycle.
Also represent it on p-v, T-s and h-s diagram
07
OR
Q.4 (a) Derive Maxwell?s equations. 07
(b) Derive equation for air standard efficiency of Brayton cycle. 07
Q.5 (a) Write down the first and second TdS equations, and derive the expression for
the difference in heat capacities, Cp and Cv.
07
(b) What is Joule Thomson coefficient? Explain it?s significance. 07
OR
Q.5 (a) Describe the method of determination of heating value of solid fuel using Bomb
calorimeter.
07
(b) A 1.5 kg mixture of two gases in 40% and 60% proportion is stored at 20? C in a
closed vessel of 5 m
3
capacity. If the gas constant for the constituent gases is 287
kJ/kgK and 294 kJ/kgK, calculate partial pressure, total pressure and gas constant
pressure for the mixture.
07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020