Yashwantrao Chavan Maharashtra Open University 2006 Certification TML Air Conditioning and Refrigeration - I - Question Paper

TML112/EE/20070814
Air Conditioning and Refrigeration - I
Time : 180 minutes Marks : 100
Instructions for the students :
1. All ques. are compulsory.
2. “Long ans kind ques. (LAQ)” is a supply kind ques. of 20 marks,
which require typical ans of about 60-80 lines in about 32-40 minutes.
3. “Short ans kind ques. (SAQ)” is a supply kind ques. of five marks,
which require typical ans of about 15-20 lines in about 08-10 minutes.
4. Use of non-programmable kind of scientific calculator is allowed.
5. Draw neat diagrams wherever necessary.
6. presume suitable data if necessary.

Long ans kind ques. (LAQ’s)

1. (a) Differentiate ranging from Heat Pump, Heat Engine and
Refrigerator.
(b) Write advantages and disadvantages of vapour compression
system over air refrigeration system.


2. (a) Define: Psychrometry. discuss the various psychrometric
properties.
(b) If 2 air streams with various psychrometric properties are
mixed together, discuss how to compute properties of
mixture.


3. (a) discuss with a suitable example how conduction, convection
and radiation plays an important role in refrigeration and
airconditioning.
(b) discuss the various properties of ideal refrigerant.


4. What is charging in refrigerator ? define
i) Gas (vapour) charging
ii) Liquid charging
iii) Charging devices

Short ans kind ques. (SAQ’s)

5. Explain- Tons of Refrigeration. 5
6. Explain- Bypass factor for sensible cooling. 5
7. What is the purpose of tubing and piping ?

Earning:   Approval pending.