Question Papers For Board Examinations 2019

Class – XII

Subject – Air Conditioning and Refrigeration

Subject :- Air Conditioning and Refrigeration

Class : XII

Year : 2019

General Instructions :

• Please check that this question paper contains 8 printed pages.
• Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate.
• Please check that this question paper contains 14 questions.
• Please write down the Serial Number of the question before  attempting it.
• 15 minute time has been allotted to read this question paper. The question  paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. 

Questions :

1. Choose the correct answer :

(i) On a psychrometric chart, sensible heating or cooling is represented by
(a) A horizontal line 
(b) A vertical line
(c) An inclined line 
(d) A curved line

(ii) The ratio of sensible heat to total heat is known as
(a) Dew Point 
(b) Humidification Ratio
(c) Relative Humidity
(d) Sensible Heat Factor

(iii) The capillary tube, as an expansion device, is used in
(a) Domestic refrigerators
(b) Water coolers
(c) Room air-conditioners
(d) All of the above

(iv) Thermostatic expansion valve operates by responding to
(a) Load 
(b) Degree of superheat
(c) Temperature
(d) Pressure

(v) Evaporator is also known as
(a) Freezing coil
(b) Cooling coil
(c) Chilling coil
(d) All of the above

(vi) The pressure at the inlet of refrigerant compressor is called
(a) Suction pressure 
(b) Discharge pressure
(c) Critical pressure 
(d) Back pressure

(vii) The refrigerant R-22 is
(a) Dichloro difluoro methane
(b) Difluoro monochloro methane
(c) Monochloro trifluoro methane
(d) Trichloro monofluoro methane
 

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Courtesy: CBSE