Applied Theromdynamics Question Paper of 3rd Semester AE Download Previous Years Question Paper 2

Roll no……………..

Total no. of Questions:09]

B.Tech. (sem.-3^rd)

APPLIED THEROMODYNAMICS

SUBJECT CODE: AE-205

PAPER ID:[A0704]

Time : 03 Hours

Instruction to Candidates:

1)    Section – A is Compulsory.

2)    Attempt any four question from section-B.

3)    Attempt any Two questions form section –C.

Section –A

1.       

a.     Give industrial uses of compressed air.

b.     Define pre-whirl.

c.      Differentiate between Thermodynamics and Heat transfer.

d.     State Dalton’s law of partial pressures.

e.      Represent Adiabatic saturation process on Psychometric chart and state enthalpy change.

f.       What are eco-friendly refrigerants?

g.     Define Lift and Drag.

h.     Define LMTD in relation to heat exchangers?

i.        Define emissivity.

j.       What are hybrid vehicles?

                                        Section-B

2.     Differentiate among Conduction, Convection and Radiation heat transfer mechanisms.

3.     Define followings:

a.     Octane number

b.     Cetane number

c.      Performance number

4.     Discuss Surging in case of Centrifugal and Axial flow compressors.

5.     Explain with neat sketches the working of Flooded type evaporator.

6.     Write properties of R-134a refrigerants.

                                                       Section-C

7.     A sample of fuel has the following percentage composition:

Carbon = 86% Hydrogen 8%; Sulphur 3%; Oxygen 2%; Ash 1% for an air-fuel ratio of 12.1, calculate,

a.     Mixture strength as a percentage rich or weak,

b.     Volumetric analysis of the dry products of combustion.

8.     Atmospheric air at a dry bulb temperature of 16 C and 25 % relative humidity passes through a furnace and then through a humidifier, in such a way that the final dry bulb temperature is 30 C and 50% relative humidity. Find the heat and moisture added to the air. Also determine the sensible heat factor of the process.

9.     A  single inlet type centrifugal compressor handles 8 Kg/s of air. The ambient air conditions are 1 bar and 20 C. the compressor run at 22000 rpm with isentropic efficiency of 82%. The air is compressed in the compressor from 1 bar static pressure to 4.2 bar total pressure. The air enters the impeller eye with a velocity of 150m/s with no pre-whirl. Assuming that the total ratio of whirl speed to tip speed is 0.3, find

a.     Rise in total temperature during compression if the change in kinetic energy is negligible.

b.     The tip diameter of the impeller,

c.      Power required,

d.     Eye diameter of the hub diameter