My Profile
Active Members
TodayLast 7 Days
more...
Awards & Gifts
Online Exams
Fresher Jobs
Our fresher job section is exclusively for fresh graduates! Find jobs for freshers in major Indian
cities including Bangalore, Chennai, Hyderabad, Pune or Kochi
Resources
Find educational articles, blogs, discussion threads and other resources.
Colleges
Find details about any college in India or search for courses.
|
Download Model question papers & previous years question papers
|
Posted By: cdteja Member Level: Silver Posted Date: 28 Nov 2007
|
2005 Jawaharlal Nehru Technological University jntu Question paper
|
|
|
Code No: NR221403 NR
II B.Tech II Semester Supplementary Examinations,
November/December 2005
THERMAL ENGINEERING & HEAT TRANSFER
( Common to Mechatronics and Production Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Define
i. bore and stroke
ii. displacement and clearance volume.
(b) Discuss the merits and demerits of 2 stroke engines over 4 stroke engines.[8+8]
2. What are the different kinds of fuels used in an IC engine? Discuss them in detail.
[16]
3. (a) What are the various characteristics of an efficient cooling systems?
(b) Explain with the help of sketches
i. Thermosyphon cooling system
ii. Pressure cooling system. [6+10]
4. (a) What do you understand by solid injection? What are its advantages over
air-injection system?
(b) Draw a schematic diagram of Bosch type fuel pump and explain its working.
[8+8]
5. (a) “Closed cycle gas turbine plants are akin to steam turbine plants” . Comment.
(b) Derive the expression for efficiency and specific work output for a simple gas
turbine cycle in terms of pressure ratio. [6+10]
6. Prove that the heat loss per square metre of outside surface area of a hollow sphere
heated from within is equal to
q =
2k(T1 - T2)
(D2 - D1)D2
D1
where T1 and T2 are the temperatures and D1 and D2 are the diameters of the
inner and outer surfaces respectively. [16]
7. (a) Define Nusselt and Prandtl numbers. Explain their importance in convection
heat transfer.
(b) A vertical pipe 5 cm diameter carrying hot water is exposed to ambient air
at 150C. If the outer surface of the pipe is 650C, find the heat loss from one
metre height of the pipe per hour. [8+8]
1 of 2
Code No: NR221403 NR
8. (a) Explain the difference between the monochromatic emissive power and total
emissive power of a black body.
(b) A small oven measures 0.4m × 0.5m × 0.3 m. The floor of the oven receives
radiation from all the walls and roof which are at 3000C having an emissivity of
0.8. The floor is maintained at 1500C and has an emissivity of 0.6. Calculate
the radiation exchange. [6+10]
? ? ? ? ?
2 of 2
Return to question paper search
|
|
|
Submit Previous Years University Question Papers and make money from adsense revenue sharing program
Are you preparing for a university examination? Download model question papers
and practise before you write the exam.
|
Watch TV Channels
|