Dr.A.P.J.Abdul Kalam University BE LATERAL III SEM BRANCH - ME Thermodynamics (ME223T) Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Third Semester Main Examination, Dec-2020

Thermodynamics (ME223T)

Branch-ME

Time: 3:00 Hrs Max Marks 70

Note : (i) Attempt any five questions out of eight.

(ii) Answer should be precise & to be point only.

(iii) Assume suitable data if necessary & state them clearly

Q.1 (a) What do you mean by thermodynamic equilibrium? 7

(b) Discuss about the ZEROTH law of thermodynamic and

explain with diagram. 7

Q.2 (a) Differentiate between the properties and work of the system.

 7

(b) What do you mean by the properties of the system? Explain

with example. 7

Q.3 (a) A gas expands in a frictionless piston-cylinder arrangement the

expansion process is very slow, and is resisted by an ambient

pressure of 100 kpg. During the expansion process, the pressure of

the system (gas) remains constant at 300 kpg. The change in

volume of the gas from 0.01m3

to 0.03m3

.Calculate the maximum

amount of work that could be utilized from the above process?

 7

(b) Write the degree of freedom at triple point of water and

derived according to GIBBS PHASE RULE. 7

Q.4 (a) Drive an expression for work done in a closed system for all

process. 7

(b) What is macroscopic and microscopic approach for the study

of motion of the particle? 7

Page [1]

Q.5 (a) Explain the first law of thermodynamics. 7

(b) What do you mean by specific heat of the substance?

Also proved- Cp –Cv=R 7

Q.6 (a) Explain the CARNOT cycle with diagram. 7

(b) Explain the reversible and irreversible process with a suitable

example. 7

Q.7 (a) State the second law of the thermodynamics with sketch. 7

(b) Two iron boxes are joined together in a process, before joining

each boxes having temperature 300k and mass of the boxes are

2kg and 3kg respectively. Calculate the entropy change of the

universe of specific heat of the both box are consider as 0.967

kj/kgk. 7

Q.8 (a) Heat is transferred to a heat engine form a furnace at a rate of

90MW. If the rate of waste heat rejection to nearby river is

55MW, determine the net power output and the thermal efficiency

for this heat engine. 7

b) In a gas turbine the gas enters at the rate of 5kg/s with a

velocity of 50 M/s and enthaspy of 900 kj/kg and leaves the

turbine with a velocity of 150 m/s and enthalpy of 400 kj/kg. The

loss of heat from the gases to the surrounding is 25 kj/kg. Assume

for gas R=0.285 kj/kgk and cp=1.004 kj/kgk and the inlet

conditions to be at 100 KPg and 27.C. determine the power output

of the turbine and the diameter of the inlet pipe.

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