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Vehicle Air Conditioning Course Code : 3360204

GTU/ NITTTR Bhopal/14 Gujarat State

GUJARAT TECHNOLOGICAL UNIVERSITY, AHMEDABAD, GUJARAT

COURSE CURRICULUM

COURSE TITLE: VEHICLE AIR CONDITIONING

(COURSE CODE: 3360204)

Diploma Programme in which this course is offered Semester in which offered

Automobile Engineering Sixth

1. RATIONALE

Vehicle air conditioning is the important feature of any modern vehicle. This course is

designed to learn the fundamental principles and basic concept of vehicle air conditioner

system. Also this will help the students in understanding the troubles occurring in vehicle air

conditioner system, its possible causes and required measures. The student will develop the

ability to use the instruments and tools to check and service the system.

2. COMPETENCY

The course content should be taught and implemented with the aim to develop different types

of skills leading to the achievement of the following competency:

Troubleshoot using standard procedures for maintaining vehicle air conditioning

and heating systems.

3. COURSE OUTCOMES

Students will be able to:

i. Identify various components of Vehicle Air conditioning and heating system.

ii. Apply various concepts related to Air conditioning and heating system.

iii. Operate manually and automatic Air conditioning and heating system.

iv. Diagnose various faults in air conditioning system by using suitable tools and

instruments.

v. Follow safety rules while servicing of Air conditioning and heating system.

4. TEACHING AND EXAMINATION SCHEME

Teaching Scheme

(In Hours)

Total Credits

(L+T+P)

Examination Scheme

Theory

Marks Practical Marks

Total

Marks

L T P C ESE PA ESE PA

150 3 0 2 5 70 30 20 30

Legends: L-Lecture; T – Tutorial/Teacher Guided Student Activity; P - Practical; C – Credit;

ESE - End Semester Examination; PA - Progressive Assessment.



5. DETAILED COURSE CONTENTS

Unit Major Learning

Outcomes (Course

Outcomes in Cognitive

Domain according to

NBA terminology)

Topics and Sub-topics

Unit – I

VEHICLE

AIR-

CONDITI

ONING

FUNDAM

ENTALS.

1a.Explain concepts of

air conditioning.

1b.Describe Air

Conditioning Cycle.

1c.Describe functions

of various

components of air-

conditioning, &

heating system.

1.1 Fundamental principles and various Definitions

(i) Heat and Modes of heat transfer.

(ii) Latent Heat, Sensible Heat.

(iii) Various Refrigerants and its properties.

(iv) Air circulation and Humidity.

(v) Cooling the air.

(vi) Drying and cleaning the air.

(vii) Due Point Temperature, Wet bulb/Dry bulb

Temperature, Humidity, Relative Humidity.

1.2 Air-conditioning principle with Schematic layout

(Vapour Compression Refrigeration cycle)

1.3 Basic Air-conditioning systems and operation of

basic components

(i) Magnetic clutch.

(ii) Types of compressors.

(iii) Condensers.

(iv) Receiver Drier and Filter.

(v) Different types of expansion valves and suction

valves.

(vi) Evaporator and heat sensing tube.

(vii) Thermostats switch, Evaporator Pressure

Regulator.

(viii) Automotive air-conditioning controls.

1.4 Working of different automotive heaters.

Unit – II

VEHICLE

AIR-

CONDITI

ONING

AND

HEATER

SYSTEMS.

2a.Describe various

automotive Air-

conditioner &

Heater systems.

2.1 Manually controlled air-conditioner heater

systems.

(i) Different types of air-conditioner heater systems.

(ii) Working and its operating modes.

2.2 Automatically controlled Air-conditioning

systems.

(i) Automatic temperature control.

(ii)Operating modes.

(iii) Different parts of automatic controlled air

conditioning system.

(iv) Humidity Control (Humidifier and Dehumidifier)

2.3 Field installed air-conditioners.

2.4 Automatic climate control.



Unit Major Learning

Outcomes (Course

Outcomes in Cognitive

Domain according to

NBA terminology)

Topics and Sub-topics

Unit– III

HEATER

AND AIR-

CONDITI

ONER

TROUBLE

SHOOTIN

G.

3a.Explain Diagnosis

& Testing of

Automotive air-

conditioner

system.

3b. Describe fire

prevention & shop

safety.

3.1 Safety in the shop.

(i) Fire prevention

(ii) Shop safety rules

(iii) Air-conditioner service safety rules

3.2 Servicing heating system

(i) Car heater system, trouble diagnosis chart

3.3 Causes of Air-conditioner failure

3.4 Trouble shooting the Air-conditioner system.

(i) Checking out a trouble

(ii) Air-conditioner trouble - diagnosis chart

3.5 Checking the refrigeration system.

(i) Checking system with sight glass

(ii) Using the Leak detector

(iii) Checking pressures with the gauge set

Unit– IV SERVICIN

G OF

VEHICLE

AIR

CONDITIO

NING

SYSTEMS.

4a.Explain

Maintenance &

service of various

components of air-

conditioner

system.

4b.Explain Charging

& Discharging of

air- conditioner

system.

4.1 Air-conditioner maintenance and service.

(i) Periodic maintenance

(ii) Vacuum pump service

(iii) Discharging the system

(iv) Adding oil

(v) Evacuating the system

(vi) Vapour charging and Liquid charging Methods.

(vii) Use of Recovery recharging unit.

4.2 Different types of air-conditioner service.

4.3 Removing and replacing components.

(i) O - rings

(ii) Hose clamps

(iii) Compressor drive belts

(iv) Removing and replacing the compressor

(v) Removing and replacing other components

4.4 Servicing Air-conditioner compressors.

(i) Servicing different types compressors

(R-4, R-6, V-type etc.)



6. SUGGESTED SPECIFICATION TABLE WITH HOURS & MARKS (THEORY)

Unit

No.

Unit Title

Teaching

Hours

Distribution of Theory Marks

(Duration – 42 Hours)

R

Level

U

Level

A

Level

Total

I. Vehicle air-conditioning

fundamentals. 13 11 10 0 21

II. Vehicle air-conditioning heater

systems. 09 07 07 0 14

III. Heater and air-conditioner trouble

shooting. 10 0 05 12 17

IV. Servicing of vehicle air

conditioning systems. 10 0 05 13 18

Total 42 18 27 25 70

Legends: R = Remembrance; U = Understanding; A = Application and above levels (Revised Bloom’s

taxonomy

Note: This specification table shall be treated as a general guideline for students and teachers.

The actual distribution of marks in the question paper may vary slightly from above table.

7. SUGGESTED LIST OF EXPERIMENTS

The tutorial/practical/exercises should be properly designed and implemented with an attempt

to develop different types of cognitive and practical skills(Outcomes in cognitive,

psychomotor and affective domain) so that students are able to acquire the competencies.

Sr.

No.

Unit

No.

Practical Exercises (Any Seven)

(Outcomes’ in Psychomotor Domain) Hours

(Total 28 hrs)

1 III Test the Air Conditioning System for refrigerant leaks. 4

2 IV Perform Evacuation of the Air-conditioner system 4

3 IV Perform Recharging the Air-conditioner system 4

4 IV Perform Air Conditioning system Recharging with

Recovery unit.

4

5 III Trouble shooting the Air-conditioner system 4

6 IV Service Air-conditioner 4

7 I Service Air-conditioner compressors 4

8 II Service Heating systems 4

8. SUGGESTED LIST OF PROPOSED STUDENT ACTIVITIES

Following is the list of proposed student activities like: course/topic based seminars, internet

based assignments, teacher guided self learning activities, course/library/internet/lab based

mini-projects, Demonstration, Industrial Visits, Transparency, Video collection, Chart or

Model preparation by students etc. These could be individual or group-based.



9. SPECIAL INSTRUCTIONAL STRATEGIES (if any)

i. Case studies of typical maintenance/installation problems in ACs for different makes

of automobiles and problem based learning

ii. Arrange expert lectures of executives of different vehicle ACs companies

iii. Visit of authorized workshop of four wheelers.

iv. Collection of animation or video clips and presentation using same.

v. Internet based assignments, teacher guided self learning activities,

course/library/internet/lab based mini-projects etc.

10. SUGGESTED LEARNING RESOURCES

A. List of Books

S.No. Author Title of Books Publication

1 Anil Chhikara Automobile Engineering

(Volume – VI)

Satya Prakashan.

2 William H.

Carouse & Donald

L. Anglin

Automotive Air-

conditioning

Tata McGraw-Hill Co., Ltd.,

New Delhi

3 Clifford L.Samuels

Automotive Air-

conditioning -

Prentice Hall Int.

4 Steven Daly Automotive Air-

conditioning &

Climate control system.

Butterworth-Heinemann

5 Mark Schnubel Automotive heating and

air conditioning

Cengage Publication

B. List of Major Equipment/ Instrument

1. Leak Detector

(a) Halide Torch complete set (Propane Cylinder, torch, etc)

(b) Electric Leak Detector complete set

(Detector probe, Amplifier/tester, 12V battery, test liquid, etc)

2. Vacuum pump – Model for demonstration

3. High/Low Pressure (Vacuum) gauge manifold (unit cm of Hg & kg/cm2)

4. Refrigerant container

5. Oil Inducer (A Long tube with connectors at ends and with a Manual valve)

6. Magnetic clutch – Model for demonstration

7. Expansion valve – Model for demonstration

8. Compressor – cut section for demonstration

9. Evaporator Pressure regulator Valve – for demonstration

10. Car Heater Blower Motor and wheel assembly – for demonstration.

11. V.C.R. Cycle – Model for Demonstration

12. Evaporator – Cut section model for demonstration

13. Air conditioning Recovery Recharging Unit



C. List of Software/Learning Websites

Sample Video for Practical:

Sr

No. Topic Sample Video URL Address

1

How To Find and Repair AC

Leaks EricTheCarGuy

<1> https://www.youtube.com/watch?v=e31HCvckZAU

<2> http://youtu.be/e31HCvckZAU

2

How To Recharge an AC

System EricTheCarGuy

<1> https://www.youtube.com/watch?v=lN55uStu8Xs

<2> http://youtu.be/lN55uStu8Xs

3

Using AC Pressure Gauges To

Fix Car AC Problems

<1> https://www.youtube.com/watch?v=PdQGS6mJjQ8

<2> http://youtu.be/PdQGS6mJjQ8

4

Quick automotive a c system

leak detection using uv dye

<1> https://www.youtube.com/watch?v=1-R8k0Rf76M

<2> http://youtu.be/1-R8k0Rf76M

5

How to Troubleshoot your

Car's AC System NBC

Consumer Watch Advance

Auto Parts

<1> https://www.youtube.com/watch?v=QsxzcoYFWTk

<2> http://youtu.be/QsxzcoYFWTk

6

How to Recharge an Auto A C

System Removing Connecting

Refrigerant Cans to a Car

<1> https://www.youtube.com/watch?v=orflU-cvxco

<2> http://youtu.be/orflU-cvxco

7

How to test for refrigerant

leaks

<1> https://www.youtube.com/watch?v=2XjAZjqSC-k

<2> http://youtu.be/2XjAZjqSC-k

8

How to pull vacuum on an

R134a car AC system

<1> https://www.youtube.com/watch?v=FiHr5V04dnc

<2> http://youtu.be/FiHr5V04dnc

9

How to evacuate and pull

vacuum on an R134a car AC

system

<1> https://www.youtube.com/watch?v=8Yom2jLiKGA

<2> http://youtu.be/8Yom2jLiKGA

10

Evacuate vacuum down your

Auto AC system w inexpensive

tools

<1> https://www.youtube.com/watch?v=8kTyLkcu0dA

<2> http://youtu.be/8kTyLkcu0dA

11

Air Conditioning

Troubleshooting

<1> https://www.youtube.com/watch?v=WncHNLdU4EA

<2> http://youtu.be/WncHNLdU4EA

12 A C Troubleshootingpart 2of 2

<1> https://www.youtube.com/watch?v=tcQ3HVVHXm4

<2> http://youtu.be/tcQ3HVVHXm4

13 A C Troubleshootingpart 1of 2

<1> https://www.youtube.com/watch?v=l5oqzuFNHx4

<2> http://youtu.be/l5oqzuFNHx4

OR Complete Video Play-list available on below single URL address

http://www.youtube.com/playlist?list=PLssHExVflgpF63EPqNhDZhNGewONk8UGs

11. COURSE CURRICULUM DEVELOPMENT COMMITTEE

Faculty Members from Polytechnics

Mr.D.A.Dave, H.O.D., Automobile Engg. , Sir Bhavsinhji Polytechnic Inst., Bhavnagar.

Mrs.M.N.Vibhakar, Lecturer, Automobile Engg. DR.S&SS Gandhi Polytechnic, Surat

Mr.A.K.Nanavati, Lecturer, Automobile Engg. G.P., Ahmadabad

Mr.V.B.Patel, Lecturer, Automobile Engg. Dr. J.N.Mehta Government Polytechnic,

Amreli Coordinator and Faculty Members from NITTTR Bhopal

Prof.K.K.Jain, Professor, Deptt of Mechanical Engineering, NITTTR Bhopal

Dr.C. K. Chugh, Professor, Deptt of Mechanical Engineering, NITTTR Bhopal

http://youtu.be/e31HCvckZAU

http://youtu.be/lN55uStu8Xs

http://youtu.be/PdQGS6mJjQ8

http://youtu.be/1-R8k0Rf76M

http://youtu.be/QsxzcoYFWTk

http://youtu.be/orflU-cvxco

http://youtu.be/2XjAZjqSC-k

http://youtu.be/FiHr5V04dnc

http://youtu.be/8Yom2jLiKGA

http://youtu.be/8kTyLkcu0dA

http://youtu.be/tcQ3HVVHXm4

http://youtu.be/l5oqzuFNHx4

http://www.youtube.com/playlist?list=PLssHExVflgpF63EPqNhDZhNGewONk8UGs

Academic

Laxmi Institute of Technology, Sarigam Diploma Automobile Department

Year: 2018-19

ASSIGNMENT: 1

Name of Subject : VAC Date: 17/12/2018

Subject Code : 3360204

Chapter/Unit: 1

Sr. No. Name of Question Remarks

1 Define:- Ton of refrigeration, Atmospheric pressure, Latent heat, Relative Humidity, Air circulation, Heat quantity, Moisture air, Sensible heat of air.

2 Explain Magnetic clutch with neat sketch.

3 Give the Sketch of Simple Vehicle air conditioner system with part name. OR Draw the line diagram of car A/C system.

4 Explain the cooling action of the vehicle A/C system with diagram.

5 Write the requirement of Refrigerants.

6 Write a short note on the application of refrigeration. OR Write in short about Refrigeration.

7 Write a short note on refrigerant oil.

8 Explain the heater core of car heater system.

9 Explain the air conditioner Thermo state.

10 Explain Swash plate type compressor with neat sketch.

11 Give different between condenser and evaporator.

12 Explain Crank type compressor. OR Explain in detailed the Crank type compressor (Reciprocating).

13

Give difference between Vapour compression system and Vapour absorption system. OR Name two refrigeration cycles. OR Explain vapor compression system with neat sketch. OR Explain automotive air conditioning cycle.

14 Explain sludging valve.

15

Explain Evaporator Pressure Regulation (EPR).

16 Define following: 1. Specific humidity 2. One ton of refrigeration 3.Absolute pressure

17 Write short note on the refrigerant of vehicle air conditioner system.

18 Explain the Evaporator of vehicle air conditioner system.

19 Explain the condenser of vehicle air conditioner system.

Academic


Year: 2018-19 20 Differentiate between cooling capacity and cooling load. OR Explain

cooling capacity and cooling load with example.

21 Explain cooling load.

22 Write properties of refrigerants.

23 Explain heat transfer with example. OR What is Heat Transfer? OR Define heat and list modes of heat transfer.

24 Explain Receiver & Dryer. OR Write short note on receiver and sight glass. OR Explain Receiver, Drier & Filter.

25 Explain thermal expansion valve. OR Explain Constant pressure expansion valve.

26 Explain Pressure switch. OR Explain the inspection of Pressure Switch.

27 Explain vehicle air conditioning system. OR What are the main components of car A/c system?

28 Explain the heater core of car heater system.

29 Write in short about Dry bulb temperature.

30 Explain heat sensing tube.

31 What is difference between refrigerant and refrigerant oil?

32 What are the main components of car heating system?

33 How compressor of the A/C system gets power?

Date of Submission:-

Name & Sign of Subject In-charge: Rakesh Chotalia

Academic


Year: 2018-19

ASSIGNMENT: 2



Chapter/Unit: 2


1 Explain the Heating action of Car Heater System with diagram. 2 Explain Vacuum Motor used in car heater system. 3 Explain Automatic Climate control system. 4 Explain Heater system of vehicle. 5 Explain functions of Sun load sensor. 6 Explain functions of Temperature sensor. 7 Explain manually controlled A/C system. 8 Explain automatically controlled A/C system. 9 Explain functions of Humidifier and De-humidifier. 10 Explain the Cooling cycle for summer in detail. 11 Write down the heating principle of car heating system. 12 Explain the Heating cycle for winter in detail. 13 Explain the Lower & Higher car interior temperature. 14 Explain Stabilized car interior temperature with neat diagram.

15 Explain the air flow circulation due to five doors of manually controlled A/C system.

16 Explain the Dual Air conditioning type car A/C system with neat diagram. 17 Write down the various field in installed Air Conditioning system.

18 Write down the various places of Air Conditioning system used for comfort of man.

19 Explain the Semi-Automatic Operational mode in ATC.

20 Explain the Fully Automatic Operational mode in ATC.

21 Write down the types of RV Air conditioners.

22 Explain the Evaporative RV A/C system with neat diagram.



Academic


Year: 2018-19

ASSIGNMENT: 3



Chapter/Unit: 3


1 Explain Halide Torch type leak detector. OR Explain the gas leak detecting method of torch type leak detector. OR List various leak detection method. Explain any one.

2 Write short note on A/C system leak testing. 3 Write the trouble probable cause and remedy for air present in refrigeration system. 4 Write the A/C system service safety rules.

5 Write the possible causes and correction for complaint of little or no heat in car heater system. OR Write probable causes for less heat or no heat.

6 Explain trouble shooting for refrigerant over charge. 7 Explain electrical type leak detector. 8 How compressor of the A/C system gets power? 9 Explain functions of humidifier and dehumidifier.

10 How pressure gauge helps to know troubles in A/C system.

11 Explain checking of A/C system with the help of sight glass.

12 If moisture is present in system which problems may arise ?

13 Write down the possible causes and correction for complaint of does not cool down sufficiently in car air conditioning system.

14 Write the precaution required when replacing parts on air conditioning system.

15 Write the symptoms and remedies by checking different amount of refrigerant through observing the sight glass on the receiver dryer.

16 Explain refrigerant overcharge and insufficient cooling of condenser. 17 Explain inspection and maintains of vehicle heater system.

18 Write the possible causes and correction for defective Magnetic clutch.

19 Explain the possible causes and correction for complaint of supplying more heat in car heater system.

20 Write the possible causes and correction for complaint of Compressor noise. 21 Explain manifold gauge set.

22 Explain the possible causes and correction for complain of blower motor inoperative and supplying more heat in car heater system.

23 Write the possible causes and correction for complaint of too much heat & blower motor in operative in car heater system.



Academic


Year: 2018-19

ASSIGNMENT: 4



Chapter/Unit: 4


1 Explain the charging of Air Conditioning system. OR Explain the charging methods. OR Explain charging A/C system by vapor refrigerant. OR Explain charging of A/C system with liquid refrigerant.

2 Explain evacuating the air conditioner system with sketch. OR Explain evacuating the A/C system. OR What is evacuation? State importance of it. OR State the procedure of evacuation.

3 How will the environment be affected by Ozone depletion ? OR Explain the servicing of car heating system.

4 Explain removing & replacing compressor drive belts.

5 Explain recovery recharging unit.

6 Write the step of disassembly of compressor.

7 Explain servicing of A/C Compressor.

8 Explain servicing of Magnetic clutch.

9 Explain routine service of car A/C system.

10 Explain routine service of car Heater system. OR Explain the servicing of car heating system.

11 What are the main hazards while handling refrigerant?

12 Explain visual inspection of A/C system.

13 Explain Inspection procedures of sludging valve.

14 Explain relay in vehicle air conditioning system.

15 Explain inspection of automotive air conditioning system.

16 Write about air conditioning service tools.

17 Explain inspection and maintains of vehicle heater system.



Laxmi Institute of Technology, Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmedabad

Academic Year 2018-19

Centre Code: 691 Examination : MID – I Examination Branch: 02 Semester: 4th sem Sub Code: 3360204 Sub: VAC Date: 31/1/2019 Time: 10:30 to 11:30 am Marks: 20 Note: Attempt all questions. Q:1 Explain vapor compression system with neat sketch.

ઘુડ કચ સાથે વેપર ક ેશન િસ ટમ સમ વો. 5

OR Q:1 Explain Evaporator Pressure Regulation (EPR).

બા પીભવન ેશર િનયમન (ઇપીઆર) સમ વો

5

Q:2 Explain cooling capacity and cooling load with example. ઉદાહરણ તર ક ઠંડક મતા અને ઠંડક લોડની સમ વો.

5

OR Q:2 Explain the air conditioner Thermo state.

એર કં ડશનર થમ ટટ સમ વો 5

Q:3 Explain the Heating action of Car Heater System with diagram. આ ૃિત સાથ ેકાર હ ટર િસ ટમની ગરમીની યા સમ વો.

5

OR Q:3 Explain the Lower & Higher car interior temperature.

લોઅર અને ઉ ચ કાર ત રક તાપમાન સમ વો. 5

Q:4 Explain automatically controlled A/C system. આપોઆપ િનયિં ત એ / સી િસ ટમ સમ વો.

5

OR Q:4 Explain the Fully Automatic Operational mode in ATC.

એટ સીમા ંસં ણૂ વચા લત ઓપરશનલ મોડને સમ વો. 5

1/3

Seat No.: ________ Enrolment No.______________

GUJARAT TECHNOLOGICAL UNIVERSITY DIPLOMA ENGINEERING – SEMESTER – VI(NEW) • EXAMINATION – WINTER - 2018

Subject Code: 3360204 Date: 04-12-2018

Subject Name: Vehicle Air Conditioning

Time: 02:30 PM TO 05:00 PM Total Marks: 70 Instructions:

1. Attempt all questions.

2. Make Suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

4. Use of programmable & Communication aids are strictly prohibited.

5. Use of only simple calculator is permitted in Mathematics.

6. English version is authentic.

Q.1 Answer any seven out of ten. દશમ ાંથી કોઇપણ સ તન જવ બ આપો. 14

1. Define ambient temperature sensor of automatic air condition system.

૧. ઓટોમેટટક એર કન્ડીસનીગ સસસ્ટમન એમ્બીયન્ટ ટેમ્પરેચર સેન્સર વ્ય સયયત કરો.

2. Write functions of A/C system.

૨. એ.સી. સસસ્ટમન ાં ક યય લખો.

3. Explain the term cooling capacity.

૩. ક લલાંગ કેપેસીટી સમજાવો.

4. Define Latent heat

૪. લેટન્ટ હીટ એટલે શ ાં?

5. Give the importance of heat transfer in vehicle air condition.

૫. વ્હીકલ એર કન્ડીસ્નીંગમ ાં હીટ ટ્ર ન્સફરન ાં મહત્વ જણ વો.

6. Write in short about Dry bulb temperature.

૬. ડ્ર ય બલ્બ ત પમ ન સવશે ટ ાંકમ ાં લખો.

7. How compressor of the A/C system gets power?

૭. એ.સી. સસસ્ટમન કોમ્રેસરને પ વર કઈ રીતે મળે છે?

8. Explain in short working of thermal expansion valve.

૮. થમયલ એક્સપ ન્સન વ લ્વ સવશે ટ ાંકમ ાં સમજાવો.

9. Explain working of temperature control amplifier.

૯. ટેમ્પરેચર કાંટ્રોલ એમ્્લીફય રન ાં ક યય સમજાવો.

10. Write in short about Refrigeration Process

૧૦. રેફ્રીજરેશન રોસેસ સવશે ટ ાંકમ ાં લખો.

Q.2 (a) Write the A/C system service safety rules. 03

રશ્ન. ર (અ) એ.સી. સસસ્ટમની સવીસ મ ટેન સ રક્ષ ન સનયમો લખો. ૦૩

(a) How the semi air flow mix air condition system works. 03

(અ) સેમી સમક્સ એર ફલો એર કન્ડીસ્નીંગ સસસ્ટમ કેવી રીતે ક મ કરે છે? ૦૩

(b) Write short note on the refrigerant of vehicle air conditioner system 03

(બ) વ્હીકલ એર કન્ડીસ્નીંગ સસસ્ટમન રેફ્રીજરન્ટ પર ટ ાંક નોંધ લખો. ૦૩

OR

(b) Explain working of condenser. 03

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(બ) કન્ડેશનરન ાં ક યય સમજાવો. ૦૩

(c) Explain the heating action of the car heater system. 04

(ક) ક ર હીટર સસસ્ટમન સહટટાંગ ક યય સવશે સમજાવો. ૦૪

OR

(c) Write the various troubles of automatic a/c. 04

(ક) ઓટોમેટટક એ.સી.મ ાં આવતી જ દી જ દી મ શ્કેલીઓ લખો. ૦૪

(d) How the independent air condition system works. 04

(ડ) ઈન્ડીપેન્ડન્ટ એર કન્ડીસ્નીંગ સસસ્ટમ કઈ રીતે ક મ કરે છે? ૦૪

OR

(d) Explain function of receiver-drier 04

(ડ) રીસીવર અને ડ્ર યરન ક યય સમજાવો. ૦૪

Q.3 (a) If moisture is present in system which problems may arise? 03

રશ્ન. 3 (અ) જો સસસ્ટમમ ાં ભેજ આવી જાય તો તેન થી કઈ મ શ્કેલીઓ આવી શકે છે? ૦૩

OR

(a) Differentiate between cooling capacity and cooling load. 03

(અ) ક લલાંગ કેપેસીટી અને ક લલાંગ લોડ વચ્ચેનો તફ વત લખો. ૦૩

(b) Explain ton of refrigeration in ac system 03

(બ) ટન ઓફ રેફ્રીજરેશન એ.સી. સસસ્ટમન સાંદભયમ ાં સમજાવો. ૦૩

OR

(b) Explain the working of crank action type compressor. 03

(બ) ક્રેંક એક્શન રક રન કોમ્રેશરન ાં ક યય સમજાવો. ૦૩

(c) Give the principle and operation of magnetic clutch. 04

(ક) મેગ્નેટટક કલચન ાં ક યય અને સસન્ધધ ાંત આપો. ૦૪

OR

(c) Write short note on evaporator. 04

(ક) ઇવોપોરેટર પર ટ ાંક નોંધ લખો. ૦૪

(d) Write the various defects observe with the help of sight glass and also write

their causes and remedies

04

(ડ) સ ઈટ ગ્લ સમ ાંની મદદથી દેખ તી ખ મીઓ તેન ક રણો અને ઉપ યો લખો. ૦૪

OR

(d) Explain the working of electrical gas leak detection method. 04

(ડ) ઇલેસક્ટ્રક ગેસ લીક ટડટકે્શન પધધસતન ાં ક યય સમજાવો. ૦૪

Q.4 (a) Write short note on Evaporator Pressure Regulator (EPR). 03

રશ્ન. ૪ (અ) ઇવોપોરેટર રેશર રેગ્ય લેટર પર ટ ાંક નોંધ લખો. ૦૩

OR

(a) Give the difference between vapour compressions and vapour absorption

system.

03

(અ) વેપર કોમ્રેશન અને વેપર અબ્સોબયશન વચ્ચેનો તફ વત લખો. ૦૩

(b) Explain expansion valve. 04

(બ) એક્ષપ ન્શન વ લ્વ સમજાવો. ૦૪

OR

(b) Explain functions of humidifier and dehumidifier. 04

(બ) હ મીડીફ યર અને ડીહ મીડીફ યર ન કયો સમજાવો. ૦૪

(c) Write a short note on automatic A/C. 07

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(ક) ઓટોમેટટક એ.સી. પર ટ ાંક નોંધ લખો. ૦૭

Q.5 (a) Explain Halide torch leak detector. 04

રશ્ન. ૫ (અ) હેલ ઈડ ટોચય લીક ડીટેકટર સમજાવો. ૦૪

(b) Explain charging of A/C system by vapor refrigerant. 04

(બ) વેપર રેફ્રીજરન્ટ દ્વ ર કરવ મ ાં આવત એ.સી. ચ ર્જિંગ સસસ્ટમ સમજાવો. ૦૪

(c) Write a short note on thermostat of A/C system. 03

(ક) એ.સી. સસસ્ટમન થમોસ્ટેટ પર ટ ાંક નોંધ લખો. ૦૩

(d) What is evacuation? State importance of it. 03

(ડ) ઈવેક્ય ાંએશન એટલે શ ાં? તેન ાં મહત્વ જણ વો. ૦૩

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GUJARAT TECHNOLOGICAL UNIVERSITY DIPLOMA ENGINEERING – SEMESTER – 6(NEW) • EXAMINATION – SUMMER 2018

Subject Code: 3360204 Date: 05-May-2018


Time: 10:30 AM TO 01:00 PM Total Marks: 70 Instructions:








1. Write down the main part name of simple vehicle air conditioner.

૧. સ દ વ્હીકલ એરક્ન્ડીશરન મખુ્ય ભ ગોન ન મ લખો.

2. Write down the function of receiver dryer.

૨. રીસીવર ડ્ર યરનુાં ક યય લખો.

3. Write down name of two gas leak detector.

૩. કોઈપણ બે ગેસ લીક ડીટેકટરન ન મ લખો.

4. Write down the full name of EPR.

૪. EPR નુાં આખ ુન મ લખો.

5. Define Cooling load.

૫. કુલીગ લોડની વ્ય ખ્ય લખો.

6. Define Cooling capacity.

૬. કુલીગ કેપીસીટી ની વ્ય ખ્ય લખો.

7. Define Ton of refrigeration.

૭. ટન ઓફ રેફ્રીજેરેશનની વ્ય ખ્ય લખો.

8. Define humidity.

૮. ભેજની વ્ય ખ્ય લખો.

9. Write down the refrigerant used in vehicle air conditioner.

૯. વ્હીકલ એરક્ન્ડીશરમ ાં વપર ત રેફ્રીજર્ટનુાં ન મ લખો..

10. What is purpose of air conditioner?

૧૦. વ્હીકલ એરક્ન્ડીશરનો હતે ુજણ વો.

Q.2 (a) Write down short note on the refrigerant of vehicle air conditioner. 03

પ્રશ્ન. ર (અ) વ્હીકલ એરક્ન્ડીશરમ ાં વપર ત રેફ્રીજર્ટ વવશે ટ ાંકનોધ લખો. ૦૩

OR

(a) Explain swash plate type compressor. 03

(અ) સ્વેશપ્લેટ પ્રક રન કોમ્પ્પ્રેશર વવશે સમજાવો. ૦૩

(b) Write short note on receiver and sight glass. 03

(બ) રીસીવર ડ્ર યર અને સ ઇટ ગ્લ સ વવશે ટ ાંકનોધ લખો. ૦૩

OR

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(b) Explain heater core of car heater system. 03

(બ) ક ર હીટર સીસ્ટમની હીટર કોર વવશે સમજાવો. ૦૩

(c) Explain the Halide torch type leak detector 04

(ક) હલે ઇડ ટોર્ય પ્રક રન લીક ડીટેકટર વવશે સમજાવો. ૦૪

OR

(c) Explain the vacuum motor used in car heater system. 04

(ક) ક ર હીટર સીસ્ટમમ ાં વપર તી વેક્ય મ મોટર વવશે સમજાવો. ૦૪

(d) Explain the principle and operation magnetic clutch. 04

(ડ) મેગ્નેટીક કલર્નો વસધધ ાંત અને ક યય સમજાવો. ૦૪

OR

(d) Write down the steps for Repairing compressor. 04

(ડ) કોમ્પ્પ્રેશર રીપેરરિંગન પગથીય લખો. ૦૪

Q.3 (a) Explain the servicing of car heater system. 03

પ્રશ્ન. 3 (અ) ક ર હીટર સીસ્ટમની સવવિસીગ વવશે સમજાવો. ૦૩

OR

(a) Explain the inspection and maintain of car heater system. 03

(અ) ક ર હીટર સીસ્ટમની ર્ક સણી અને જાળવણી વવશે સમજાવો. ૦૩

(b) Draw the line Diagram of vehicle air conditioner. 03

(બ) વ્હીકલ એરક્ન્ડીશરનો લ ઇન ડ ય ગ્ર મ દોરો. ૦૩

OR

(b) Explain the inspection of vehicle air conditioner. 03

(બ) વ્હીકલ એરક્ન્ડીશરની ર્ક સણી વવશે સમજાવો. ૦૩

(c) Write short note on the refrigerant oil 04

(ક) રેફ્રીજર્ટ ઓઇલ વવશે ટ ાંકનોધ લખો. ૦૪ OR

(c) Write short note on Evaporator Pressure regulator. 04

(ક) ઇવેપોરેટર પે્રશર રેગ્યલેુટર વવશે ટ ાંકનોધ લખો. ૦૪

(d) Explain The Manifold Pressure Gauge Set. 04

(ડ) મેનીફોલ્ડ પ્રેશર ગેજ સેટ વવશે સમજાવો. ૦૪

OR

(d) Explain The Evacuating vehicle air conditioning system. 04

(ડ) વ્હીકલ એરક્ન્ડીશરની ઈવેક્યએુટીગ પ્રક્રીય વવશે સમજાવો. ૦૪

Q.4 (a) Explain heat transfer with Example. 03

પ્રશ્ન. ૪ (અ) હીટ ટ્ર ્સફર ઉદ હરણ સરહત સમજાવો. ૦૩

OR

(a) How will environment be affected by ozone depletion? 03

(અ) ઓઝોનન ઘસ ર ની વ ત વરણ પર શી અસર પડે છે. ૦૩

(b) Write down The properties of refrigerant. 04

(બ) રેફ્રીજર્ટન ગણુધમો વવશે લખો. ૦૪

OR

(b) Write possible causes and correction for complaint of too much heat and

blower motor in operate in car heater system 04

(બ) ક ર હીટર સીસ્ટમમ ાં વધ રે હીટ અને બ્લોઅર મોટર બાંધ હોવ ન ક રણો અને ૦૪

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ઉપ યો લખો. (c) Write down causes and correction for complaint of air present in car air

conditioning system. 07

(ક) વ્હીકલ એરક્ન્ડીશીગ સીસ્ટમમ ાં હવ ની હ જરીન ક રણો અને ઉપ યો લખો. ૦૭

Q.5 (a) Write down necessity of refrigerant. 04

પ્રશ્ન. ૫ (અ) રેફ્રીજર્ટની જરૂરીય ત વવશે લખો. ૦૪

(b) Explain The charging system of vehicle air conditioning system. 04

(બ) વ્હીકલ એરક્ન્ડીશીગ સીસ્ટમની ર્ જીગ પ્રક્રીય વવશે સમજાવો. ૦૪

(c) Explain the electrical type gas leak detector 03

(ક) ઇલેરટ્રક પ્રક રન ગેસ લીક ડીટેકટર વવશે સમજાવો. ૦૩

(d) Write possible causes and correction for complaint of insufficient refrigerant

in car air conditioning system. 03

(ડ) વ્હીકલ એરક્ન્ડીશીગ સીસ્ટમમ ાં અપ રત રેફ્રીજર્ટન ક રણો અને ઉપ યો લખો.

૦૩

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GUJARAT TECHNOLOGICAL UNIVERSITY DIPLOMA ENGINEERING – SEMESTER –VI • EXAMINATION – SUMMER- 2017

Subject Code: 3360204 Date:09-05- 2017


Time: 10:30 AM TO 01:00 PM Total Marks: 70 Instructions:








1. What is ton of refrigeration ?

૧. ટન ઓફ રેફ્રીજરેશન સમજાવો.

2. Define dew point temperature.

૨. ડ્ય ુપોઈન્ટ ટેમ્પરેચરની વ્ય ખ્ય આપો.

3. Define Humidity.

૩. હ્યમુીડ્ીટીની વ્ય ખ્ય આપો.

4. What are the main component of A/C system ?

૪. ક ર એ/સી સસસ્ટમન મખુ્ય ઘટકો કય છે ?

5. What are the main component of halide torch ?

૫. હલે ઇડ્ ટોચચન મખુ્ય ઘટકો કય છે.

6. Explain function of condenser.

૬. કન્ડ્ેન્સરનુાં ક યચ સમજાવો.

7. Write function of halide torch.

૭. હલે ઇડ્ ટોચચન ુાં ક યચ લખો.

8. What is C.O.P. of refrigeration ?

૮. રેફ્રીજરેશનનો કો-ઇફીશીયન્ટ ઓફ પરફોમચન્સ સમજાવો.

9. Name of two refrigeration cycles.

૯. બે રેફ્રીજરેશન સ યકલન ન મ આપો.

10. What are the main components of vapour absorption system ?

૧૦. વેપર એબ્સોર્પશચન સસસ્ટમન મખુ્ય ઘટકો કય છે ?

Q.2 (a) Write short note on refrigerant oil. 03

પ્રશ્ન. ર (અ) રેફ્રીજરેન્ટ ઓઈલ પર ટ ાંક નોંધ લખો. ૦૩

OR

(a) Write the difference between heater and air conditioner. 03

(અ) હીટર અને એર કાંડ્ીશનર વચ્ચેનો તફ વત લખો. ૦૩

(b) Write short note on swash plate type compressor. 03

(બ) સ્વેશ ર્પલેટ ટ ઈપ કોમ્રેસર પર ટ ાંકનોંધ લખો. ૦૩

OR

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(b) Give the schematic layout of vehicle air conditioner with parts name. 03

(બ) વેહહકલ એર કાંડ્ીશનર સસસ્ટમનો લેઆઉટ દોરી તેન ભ ગોન ન મ આપો. ૦૩

(c) Give the schematic layout of vapour absorption system with parts name. 04

(ક) વેપર એબ્સોર્પશચન સસસ્ટમનો લેઆઉટ દોરી તેન ભ ગોન ન મ આપો. ૦૪

OR

(c) Explain magnetic clutch. 04

(ક) મેગ્નેહટક ક્લચ સમજાવો. ૦૪

(d) Explain air cooling unit. 04

(ડ્) એર કુલલિંગ યસુનટ સવશે સમજાવો. ૦૪

OR

(d) Explain electric type leack detector. 04

(ડ્) ઇલેક્ટ્ક્િક ટ ઈપ લીક હડ્ટેક્ટર સમજાવો. ૦૪

Q.3 (a) Explain reheat air conditioning system. 03

પ્રશ્ન. 3 (અ) હરહીટ એર કાંડ્ીશસનિંગ સસસ્ટમ સમજાવો. ૦૩

OR

(a) Explain servicing of car heater system. 03

(અ) ક ર હીટર સસસ્ટમનુાં સસવિસસિંગ સમજાવો. ૦૩

(b) Write the possible cases correction for complain of compressor noise. 03

(બ) કોમ્રેશર અવ જ કરત ુહોય તેન ક રણો અને ઉપ યો જણ વો. ૦૩

OR

(b) Explain automatic temperature control. 03

(બ) ઓટોમેહટક ટેમ્રેચર કાંિોલ સમજાવો. ૦૩

(c) Explain the charging of air conditioning system. 04

(ક) એર કાંડ્ીશસનિંગ સસસ્ટમમ ાં ચ જીંગ સવશે સમજાવો. ૦૪ OR

(c) Explain automatic climate control. 04

(ક) ઓટોમેહટક ક્લ ઈમેટ કાંિોલ સવશે સમજાવો. ૦૪

(d) Write AC system service safety rules. 04

(ડ્) એસી સસસ્ટમન સસવિસન સેફ્ટી રૂલ્સ લખો. ૦૪

OR

(d) Explain evaporator pressure regulator. 04

(ડ્) ઇવોપોરેટર રેશર રેગ્યલેુટર સવશે સમજાવો. ૦૪

Q.4 (a) Explain gauge adjustment. 03

પ્રશ્ન. ૪ (અ) ગેજ એડ્જસ્ટમેન્ટ સવશે સમજાવો. ૦૩

OR

(a) Explain the working of sight glass. 03

(અ) સ ઈટ ગ્લ સની ક યચપધ્ધસત સમજાવો. ૦૩

(b) Explain trouble shooting with manifold gauge. 04

(બ) મેનીફોલ્ડ્ ગેજ વડ્ે ફહરય દ તપ સણી સવશે સમજાવો. ૦૪

OR

(b) Write the possible cases and correction for complain of refrigerant

overcharge 04

(બ) રેફ્રીજરેન્ટ ઓવર ચ ર્જની ફહરય દ મ ટેન શક્ય ક રણો અને તેને સધુ રવ ન ૦૪

3/3

ઉપ યો લખો. (c) List various leack detection method explain any one. 07

(ક) જુદી જુદી લીક જાણવ ની રીતોની ય દી બન વો તથ કોઈપણ એક સમજાવો. ૦૭

Q.5 (a) Explain periodic inspection of drive belts. 04

પ્રશ્ન. ૫ (અ) ડ્ર ઈવ બેલ્ટની સનયતક લીન તપ સણી સવષે સમજાવો. ૦૪

(b) Explain procedure for re assembling clutch. 04

(બ) ક્લચ હર-એસેમ્બલ કરવ ની રીત જણ વો. ૦૪

(c) Write the short note on vacuum pump service. 03

(ક) વેક્યમુ પાંપ સસવિસ સવષે ટ ાંક નોંધ લખો. ૦૩

(d) How will the environment be affected by ozone depletion ? Give the reason

for ozone depletion. 03

(ડ્) ઓઝોનન ઘસ ર ની વ ત વરણ ઉપર શુાં અસર થ ય છે ? ઓઝોનન ઘસ ર મ ટેન ક રણો આપો.

૦૩

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LAXMI INSTITUTE OF TECHNOLOGY, SARIGAM1a.Explain concepts of air conditioning. 1b.Describe Air...

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