Applied Thermodynamics - II, Question Paper of Mechanical Engineering 4th Semester, Download Question Paper Applied Thermodynamics 12

Roll No. ......................

Total No. of Questions : 09]

B. Tech. (Sem. – 4th)

APPLIED THERMODYNAMICS - II

SUBJECT CODE : ME – 208 (2008 Batch)

 Paper ID : [A0811]

Time : 03 Hours

Instruction to Candidates:

1) Section - A is Compulsory.

2) Attempt any Four questions from Section - B.

3) Attempt any Two questions from Section - C.

Section – A

Q1)

a) What is pseignition?

b) How I.C. engines are classified?

c) What is an axial flow compressor?

d) What is meant by chocking in centrifugal compressor?

e) How blade materials for a gas turbine is selected?

fl Define specific fuel consumption.

g) What is a turbojet engine?

h) Define angle of attack.

i) What do you understand by delay period in S.I engine?

j) What are the advantages of super charging'?

Section - B

Q2) Discuss the effect of detonation on engine performance.

Q3) During testing of a four  stroke diesel engine  the following  observations

were noted :

Area of indicator diagram = 420mml

Length of indicator diagram = 62mm

Spring number = l.l bar/mm.

' Diameter of piston = l00mm

Length of the stroke = l50mm

Engine speed = 450 rpm.

Determine the indicated mean effective pressure and indicated power.

Q4) Compare and contrast the rotary compressor and reciprocating compressor.

Q5) Explain the effect of prewhirl on the impeller of centrifugal pump.

Q6) What do you understand by propulsion system? Discuss the advantages

and disadvantages of jet propulsion system.

Section - C

Q7) A centrifugal compressor delivers 50 kg of air per minute at a pressure of 2

bar and 97"C. The intake pressure and temperature of the air is I bar and

l5'C. If no heat is lost to the surrounding find :

(a) Index of compression.

(b) Power required if the compression is isothermal.

Take R=287Jlkgk.

8. a simple closed cycle gas turbine plant receives air at 1 bar and 15 C and compressor it to 5 bar and then heats it to 800 C in the heating chamber. The hot air expands in a turbine back to 1 bar. Calculate the power developed per kg. of air supplied per second. Take Cp for air as 1kj/kgk.

9. Write notes on:

`        a. High speed engine indicators.

          b. Surging in axial flow compressor