Janardan Rai Nagar Rajasthan Vidyapeeth 2007 Diploma Automobile Engineering REFRIGERATION AND AIR CONDITIONING SYSTEMS - Question Paper
JRN Rajasthan Vidyapeeth University
DIPLOMA
REFRIGERATION AND AIR CONDITIONING SYSTEMS
Model Question Paper
DTA8/DTM8 REFRIGERATION AND AIR CONDITIONING SYSTEMS
Duration : 3 Hrs. Maximum Marks : 75
Instruction:
1. Question paper is divided into Group A, Group B and Group C
2. Each Group is 25 Marks
3. Figure to the right in bracket indicate marks.
4. Good Handwriting is expected
Group A (25 Marks)
Answer any three questions (Question 1 is compulsory)
(10) (5)
Q1. What are different applications of refrigeration?
Q2. Draw flow diagram of simple vapour absorption refrigeration cycle and explain its working in short?
(10)
Q3. What is Rotary Compressor? Give its construction and
working. Enlist advantages of rotary compressor over reciprocating?
(10)
Q4. (a)
Explain the window air conditioning ?
(b) Explain the layout for control air conditioning.
(10)
Q5. What is thermal insulation? What are the properties of
good insulating materials?
Group B (25 Marks)
Answer any three questions (Questions 6 is compulsory)
(5)
Q6. What are the applications of Air Conditioning ?
Q7. A refrigerating system operates on the reversed cannot cycle. The higher temperature of the refrigerant in the system is 40OC, while lower is -12OC. The capacity of the machine is 15 Tons of refrigeration?
(10)
Neglecting all losses find
(i) The co-efficient of performance.
(ii) The heat rejected from the system per hour.
(10)
(iii) The power required to drive the machine.
Q8. What is Refrigerant? Give classification of it? Give desirable properties of refrigerant?
(10)
Q9. What
is powder metallurgy , Describe briefly the primary processes required for
manufacturing parts from powdered metal.
(10)
Q10. Give construction and working of
following
(i) Screw Type Compressor, (ii) Thermostatic expansion value
Group C (25 Marks)
All Questions are Compulsory.
Q.11. Fill in the blanks (Each question carries 2 Marks, Total = 10 Marks)
(i) ________ is the process of removing heat from a substance.
(ii) Bell Coleman cycle is also known as ________.
(iii) ________ is used in refrigeration system to remove moisture as well as minute particles to have its normal functioning.
(iv) ________ are used to increase the level of moisture in the air.
(v) Units of refrigeration effect is ________.
Q.12 Multiple choice questions (Each question carries 2 marks, Total = 10 marks)
(i) The critical temperature of Ammonia is ________
(a) 132.6OC (b) 81OC (c) 120OC (d) 197.8OC
(ii) Commercial name of Dichloro difluro-methane is
(a) F-11 (b) F-12 (c) F-22 (d) None
(iii) The heard of the vapour compression refrigeration system is
(a) Compressor (b) Condenser
(c) Expansion device (d) Evaporator
(iv) The process of heating of air at constant specific humidity is called
(a) Latent heating (b) Humidification (c) Sensible heating (d) None
(v) Human comfort conditions for summer are
(a) 24OC DBT, 60% RH (b) 34OC DBT, 50% RH
(c) 29OC DBT, 60% RH (d) None
Q.13. Indicate whether following statements are True or False (Each question carries 1 marks, Total = 5 Marks)
(i) Evaporative cooling is mostly used in hot & dry weather ambient conditions.
(ii) Removal of moisture from air is called humidification.
(iii) Rectifier is a partial condenser.
|
(iv) C.O.P.
of refrigerant is where T1 = Higher Temperature, T2
= Lower Temperature
(v) Carbon-di-oxide is a refrigerant which is most suitable for ships.
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| Earning: Approval pending. |
