CBSE Class 12 Question Paper 2026 Air Conditioning Refrigeration

FOR CBSE CLASS 12 EXAM PREPARATION

CBSE Class 12 2026
Question Paper · Air
Conditionng
Refrigeration
EXAM YEAR TYPE SUBJECT

CBSE Class 12 2026 Question Paper Air Conditionng Refrigeration

Notes · Sample Papers · Previous Year Papers · Mock Tests

m
m .co

m .co s e m
se g l a
Series : RPQ3S
a SET~4

351
- 
Q.P. Code

 .  -   - 
Roll No. -    
Candidates must write the Q.P. Code
m
m on the title page of the answer-book.
.co
.co s e m

s em NOTE :
g l a
(I)  la     -    (I) Please check that this question
a
15ag paper contains 15 printed pages.

(II) -        - (II) Q.P. Code given on the right hand
   -  -  side of the question paper should
be written on the title page of the
 
answer-book by the candidate.
(III)       -  24  (III) Please check that this question
  paper contains 24 questions.

o m
. c
(IV)         , (IV) Please write down the serial
-       m number of the question in
{ }as
e the answer-book at the given
  
g l place before attempting it.
a
(V)  -     15   (V) 15 minute time has been
     -     allotted to read this question
paper. The question paper will
10.15     10.15  
be distributed at 10.15 a.m.
10.30     -  From 10.15 a.m. to 10.30 a.m.,
       - the candidates will read the
      question paper only and will not
write any answer on the answer-
m
.co
book during this period.
m
m .co s em
s e    gla
g la a
AIR-CONDITIONING AND REFRIGERATION
a
  : 3    : 60
Time allowed : 3 hours Maximum Marks : 60

^351^ 2351 1 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 1 of 16

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  :
(i)       
(ii)  -     24   : -  - 
(iii) -        -       
(iv)   (6 + 18) = 24   ,   3    ()  
(6 + 11) = 17      
(v)                 
(vi) - :     (30 ) :
(a)    6   
(b)      
(c)       
(d)  /          
(vii) - :     (30 ) :
(a)    18   
(b)   11    
(c)       
(d)  /          

 – 
(   )

1.      6     4      41=4
(i)     (Parts of speech)     1
(ii)                ? 1
(A)  (Openness) (B) -
(C)  (D) 

^351^ 2 *

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m
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m .co s e m
se g l a
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General Instructions :
a
(i) Please read the instructions carefully.
(ii) This Question Paper consists of 24 questions in two sections – Section – A
and Section – B.
(iii) Section – A has Objective Type Questions whereas Section – B contains
Subjective Type Questions.
m
m
(iv) Out of the given (6 + 18) = 24, a candidate has to answer (6 + 11) = 17 .co
.co
questions in the allotted (maximum) time of 3 hours.
s e m
em of a particular section must be attempted in the correct
(v) All squestions g l a
g l a
order. a
a
(vi) Section – A : Objective Type Questions (30 Marks) :
(a) This section has 6 questions.
(b) There is no negative marking.
(c) Do as per the instructions given.
(d) Marks allotted are mentioned against each question/part.
m
(vii) Section – B : Subjective Type Questions (30 Marks) :
.co
(a)
s em
This section has 18 questions.
a questions.
(b) A candidate has to dol11
g
a
(c) Do as per the instructions given.
(d) Marks allotted are mentioned against each question/part.

Section – A
(Objective Type Questions)

m
1.
m Answer any 4 out of the given 6 questions on Employability Skills.
c. o 4  1 = 41
c. o (i) Write the name of basic parts of speech. s e m
e m (ii) Which of the following is not a parameter to describeaan individual’s
l
las personality ?
a g 1
ag (A) Openness (B) Self-confidence
(C) Neuroticism (D) Agreeableness

^351^ 3 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 3 of 16

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(iii)             ? 1
(A)  (Numbers) (B)  (Formula)
(C)  (Text) (D)  (Graphic)
(iv) _________               
  1
(A)  (Meditation) (B)  (Yoga)
(C)   (D)  
(v)                
  ? 1
(A)   (Educate) (B)  (Interview)
(C)   (D) 
(vi) “” (Motivation)       1

2.   7     5     : 51=5
(i)                
          _____    1
(A)   
(B)     
(C) 
(D)    () 
(ii)                 
 _____    1
(A)  (B) 
(C)  (D) 
(iii)  ,           : 1
(A)  (B) 
(C)   (D) 

^351^ 4 *

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m .co

m .co s em
se g la
{} a
(iii) Which of the following is not a type of data in spreadsheets ? 1
(A) Numbers (B) Formula
(C) Text (D) Graphic
(iv) _________ includes a series of postures and breathing exercise to
control the body and mind. 1
m
(A) Meditation
m (B) Yoga
.co
.co
(C) Physical exercise (D) Sleeping e m
s emof the following encourage people to recycle household waste ? gl1as
gl(A)a Educate
(v) Which
a
a (B) Interview
(C) Recycle bank (D) Curefit
(vi) State the meaning of “Motivation”. 1

2. Answer any 5 out of the given 7 questions : 51=5
(i)
o m
The psychrometric process in which air is cooled and humidified but
c
. ________.
no heat is supplied or rejected is called
e m 1

la
(A) Cooling and humidifications
a
(B) Mixing of air streams
g
(C) Dehumidification
(D) Cooling with adiabatic humidification
(ii) The mode of heat transfer by the actual movement of particles of the
medium from one place to other is called ________. 1
(A) Convection (B) Radiation m
m .co
m .co (C) Conduction
em
(D) Transmission
s
s e g a
(iii) This component is used to remove the latent heat of lrefrigerant : 1

g la (A) Condenser a
(B) Compressor
a
(C) Capillary tube (D) Evaporator

^351^ 5 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 5 of 16

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(iv) ..         ? 1
(A)     (B)    
(C)     (D)     
(v)               ? 1
(A)  (B) 
(C)  (D) 
(vi)       AC      ? 1
(A)  (B)  ()
(C)  () (D)  ()
(vii)   
            
  ? 1
(A)     (B)    
(C)  (D) 

3.   7     6     : 61=6

(i)      _____   1
(A)  (B)  
(C)  (D) 
(ii)      
        : 1
(A)  (B) 
(C)  (D) 
(iii)           1
(A)   (B)  
(C) -  (D)  
(iv)   _____        1
(A)    (B)   
(C)      (D)      

^351^ 6 *

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 6 of 16

m
m .co

m .co s e m
se g l a
{} a
(iv) How does the L.P. cutout protect the compressor ? 1
(A) By shutting off the compressor
(B) By increasing the refrigerant flow
(C) By increasing the compressor speed
(D) By decreasing the refrigerant flow
(v) Which one among the following is not an equipment of cold storage
m
plant ?
m 1
.co
.co
(A) Compressor (B) Evaporator
s e m
em
(C) Condenser
s (D) Liquidizer
l a
la is not the core component of central A.C. ?
(vi) Which
g ag 1
a (A) Washer (B) Compressor
(C) Evaporator (D) Condenser
(vii) In a window air conditioner which one among the following types of
condensers is used ? 1
(A) Natural convection air cooled (B) Forced convection air cooled
(C) Water cooled (D) Evaporative

o m
3. Answer any 6 out of the given 7 questions c
. : 61=6
e m
la s
(i) Capillary tube is a type of _________. 1
(A) Condenser
a g (B) Expansion valve
(C) Evaporator (D) Compressor
(ii) This type of filter is not used in an air conditioning system : 1
(A) Centrifugal (B) Viscous
(C) Electric (D) Dry
(iii) For small cold storage, the rooms are cooled _________. 1
(A) by air (B) by water
m
m (C) by brine (D) by hydrogen
c. o (iv) The overload protector provides protection against the s_________.
m .co
e 1

s em (A) extreme compression ratio
g l a
la a
ag
(B) freezing up of the evaporator
(C) leak of air into the system
(D) overheating and burn out of motor winding
^351^ 7 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 7 of 16

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(v)   :         1

(A)  ()  (B)   
(C) -  (D) (B)  (C) 

(vi)               1

(A)    (B) 
(C)    (D) 
(vii)             ? 1

(A)      
(B)      
(C)      
(D)    

4.   6     5     : 51=5

(i)    :        1

(A)    (B)   
(C)  (D)   
(ii)             ? 1

(A)  (B)  
(C)   (D) ... (PUF)
(iii)  R-11  1

(A)   (B)   
(C)    (D)   
(iv) ..    _____       1

(A)    (B)   
(C)    (D)   

^351^ 8 *

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m
m .co

m .co s em
se g la
{} a
(v) The evaporator which is commonly used in packaged air conditioner is 1
(A) Finned evaporator (B) Plate surface evaporator
(C) Bare-tube evaporator (D) Both (B) and (C)
(vi) Addition of moisture to the air, without any change in its dry bulb
temperature is known as 1
(A) Sensible heating (B) Humidification
m
(C) Sensible cooling
m (D) Dehumidification
.co
.co
(vii) Which one of the following is not a property of a thermal insulating
m s e m
material ?
s e l1a
g
(A)a to retard the heat flow
l ag
a (B) to maximize temperature fluctuations
(C) to minimize water vapour transmission
(D) to add strength to the walls

4. Answer any 5 out of the given 6 questions : 51=5
(i) The psychrometric process generally used in heat pump : 1
m
.co
(A) Heating and humidification

em
(B) Sensible heating
(C) Humidification
la s
ag
(D) Cooling and dehumidification
(ii) The insulating material is best for domestic refrigerators is 1
(A) Thermocole (B) Glass wool
(C) Glass sheet (D) PUF
(iii) The refrigerant R-11 is 1
(A) Carbon dioxide
(B) Trichloro monofluoro methane m
m .co
.co
(C) Monochloro trifluoro methane

m (D) Trichloro trifluoro ethane s em
s e g a ________.
lusing
g la (iv) H.P. cutout is essential in the refrigeration systems
a 1

a (A) water cooled condenser (B) air cooled condenser
(C) natural convection condenser (D) forced convention condenser

^351^ 9 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 9 of 16

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(v)   ,       1
(A)    (B)   
(C)       (D)   
(vi)             1
(A)  (B) 
(C)  () (D) 

5.   6     5     : 51=5

(i)   ()   _____       1
(A)  (B) 
(C)  (D)   
(ii)              ? 1
(A)  (B) ...
(C)  (D) 
(iii)          ? 1
(A) ..  (B)  
(C)  (D) .. 
(iv)  -
          1
(A) R-134a (B) R-22
(C) R-11 (D) R-12
(v)                1
(A)   (B)  
(C)   (D)  
(vi)            ? 1
(A)    (B)   
(C)      (D)     
^351^ 10 *

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m
m .co

m .co s e m
se g l a
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(v) In ice making, thawing of ice means
a 1
(A) Cleaning of ice (B) Breaking of ice
(C) Dipping ice in hot water (D) Freezing of water
(vi) A grill provided with a damper or control valve is known as 1
(A) Filter (B) Fan
(C) Receiver (D) Register
m
c o m m .co
Answer any 5 .out of the given 6 questions : e
5.
emmeat is preserved by _________.
51=5
l as
s
(i) Poultry
la Pasteurization ag
1

ag(A) (B) Thawing
(C) Blending (D) Chilling and freezing
(ii) Which one among the following is not present in a household
refrigerator ? 1
(A) Condenser (B) A.H.U.
(C) Evaporator (D) Compressor

m
.co
(iii) Which one among the following is not a control device ? 1
(A) L.P. cutout
s em (B) Overload protector
(C) Refrigerant
g la (D) H.P. cutout
a refrigerant used in a household refrigerator
(iv) An environment friendly
is 1
(A) R-134a (B) R-22
(C) R-11 (D) R-12
(v) Heat is transfered in a metal rod heated at one end 1
(A) by transmission
m
.co
(B) by convection
m
m .co (C) by radiation
s em
s e (D) by conduction
g laprocess ?
g la a
(vi) Which one among the following is not a psychrometric 1
a (A) Dehumidification of air (B) Ventilation of air
(C) Mixing of air streams (D) Sensible cooling of air

^351^ 11 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 11 of 16

{}
6.   6     5     : 51=5
(i)      1
(A)    (B)  
(C)   (D)  
(ii)       1
(A)     (B)    
(C)     (D)    
(iii)              1
(A)    (B)   
(C)    (D) (B)  (C) 
(iv)            ? 1
(A) 0 C  –24 C (B) –40 C  –80 C
(C) 0 C  –40 C (D) –24 C  –40 C
(v)              : 1
(A)   (B)   
(C)   (D)   
(vi)      ()      ? 1
(A)      (B)    
(C)     (D)       

 – 
(   )
     5     3          20-30
    32=6
7.        2

8.          2

9.          ?          
  2
^351^ 12 *

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m
m .co

m .co s e m
se g l a
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6. Answer any 5 out of the given 6 questions :
a 51=5
(i) The freon group of refrigerants are 1
(A) inorganic refrigerants (B) halocarbon refrigerants
(C) azeotropic refrigerants (D) hydrocarbon refrigerants
(ii) It is not a duct system – 1
(A) Reduced plenum duct system
(B) Radial perimeter duct system m
m .co
.co
(C) Extended plenum duct system
e m
(D) Loop perimeter duct system
em l as
l as
(iii) The relay which is operated by the heat produced due to flow of
electric current – ag
ag (A) Hot wire relay (B) Current starting relay
1

(C) Voltage starting relay (D) Both (B) and (C)
(iv) What is the air temperature range in air blast freezers ? 1
(A) 0 C to –24 C (B) –40 C to –80 C
(C) 0 C to –40 C (D) –24 C to –40 C
(v) These type of fans are not used in an air conditioning plant. 1
(A) Centrifugal fan (B) Axial flow fan
m
(C) Propeller fan
.co
(D) Ceiling fan
m
s e
(vi) What is the function of a drier in a refrigeration system ? 1
(A) to add moisture to refrigerant
g la
(B) to clean the condenser a
(C) to clean the evaporator
(D) to absorb moisture from the refrigerant

Section – B
(Subjective Type Questions)
Answer any 3 out of the given 5 questions on Employability Skills.
m
m Answer each question in 20-30 words.
c. o State four key communication skills.
32=6
m.co
m
7.
s e 2

s e g l a
g la 8. Enlist the four ways to manage stress.
a 2

a 9. Why is text formatting necessary in a spreadsheet ? Mention any two
ways of formatting content in a spreadsheet. 2

^351^ 13 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 13 of 16

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10.       ,          
  2

11.      ,               2

  5     3     20-30    : 32=6
12. ‘  ’ ( )      2

13.     ? 2

14.               2

15.            2

16.       2

  3     2     30-50    : 23=6
17. ‘ ’        3

18.    , ‘    ’     3

19.  R-22       3

  5     3     50-80    : 3  4 = 12
20.          ‘ ’     4

21.                4

22.              4

23.           4

24.        4
____________

^351^ 14 *

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m
m .co

m .co s em
se g la
{} a
10. Write any four government schemes that helps small scale entrepreneurs
to gain capital. 2

11. Mention four plants, which are used to make our home toxin free. 2

Answer any 3 out of the given 5 questions in 20-30 words each : 32=6
12. Describe the process of ‘Sensible Heating’. m
.co
2
m
.co
13. What are thermal insulating materials ? 2
s e m
s em l a
a steps to produce a transparent and good quality ice.
14. Write lthe
g ag 2
a
15. Describe the importance of a filter in an air conditioning unit. 2

16. Write the function of a condenser. 2

Answer any 2 out of the given 3 questions in 30-50 words each : 23=6
17. Explain the different modes of ‘Heat Transfer’. 3
o m
c
. of two air streams’.
18. Describe the psychrometric process of ‘Mixing 3
e m
s
la R-22.
19. Enumerate the properties of refrigerant
a g 3

Answer any 3 out of the given 5 questions in 50-80 words each : 3  4 = 12
20. Explain the ‘downward system’ of air distribution with a neat sketch. 4

21. Describe the function of a capillary tube. Write its advantages and
disadvantages. 4

m
c
22. Explain high pressure cutout with a neat sketch.
om m.co 4

m .23. Draw a neat and labelled diagram of an ice plant. s e 4
s e g l a
g la 24. Explain the central air conditioning system. a 4
a ______________

^351^ 15 * [ P.T.O. ]

m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 15 of 16

{}

2351
^351^ 16 *

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