CBSE-CLASS-XII SERIES Air-conditioning-and-refrigeration
Refrigeration Devices
18 previous year questions.
Volume: 18 Ques
Yield: Medium
High-Yield Trend
18
2025 Chapter Questions 18 MCQs
01
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Give an example of an eco-friendly refrigerant and also write its properties.
02
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Draw the labelled layout of a cold storage plant.
03
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Write the properties of R-12.
04
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
What is a refrigerant? Give two examples.
05
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
The refrigerant R-22 is:
1
Monochloro trifluoro methane
2
Dichloro difluoro methane
3
Tetrachloro difluoro ethane
4
Trichloro monofluoro methane
06
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
The refrigerant ammonia is:
1
R-717
2
R-134
3
R-718
4
R-152
07
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
The principle of evaporative cooling is not used in:
1
Ice plant
2
Dessert cooler
3
Earthen pot
4
Acetone poured on skin
08
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
In a window air conditioner, ............ type of evaporator is used.
1
Plate surface evaporator
2
Bare-tube evaporator
3
Finned evaporator
4
Both (A) and (B)
09
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
It starts operating when the pressure in the suction line falls below a pre-determined value:
1
Overload protector
2
Relay
3
L.P. cutout
4
H.P. cutout
10
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
The condenser used in a domestic refrigerator:
1
Water cooled condenser
2
Evaporative condenser
3
Air cooled condenser
4
Double tube condenser
11
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Thermostatic expansion valve operates by responding to ...........
1
Load
2
Degree of superheat
3
Temperature
4
Pressure
12
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Automatic expansion valve is also known as:
1
Thermostatic expansion valve
2
Float valve
3
Constant pressure expansion valve
4
Capillary tube
13
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Dairy refrigeration includes:
1
Meat preservation
2
Refrigeration of milk and butter
3
Ice making
4
Preserving potatoes
14
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
The evaporator generally used in wine cooling is:
1
Double tube evaporator
2
Shell and tube evaporator
3
Plate evaporator
4
Finned evaporator
15
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
It starts operating when the pressure in the discharge line rises above a certain predetermined pressure.
1
L.P. cutout
2
Relay
3
Overload protector
4
H.P. cutout
16
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
Brine is used as a secondary refrigerant in:
1
Domestic refrigerator
2
Ice plant
3
Window air conditioner
4
Freezer
17
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
It is a type of relay:
1
H.P. cutout
2
L.P. cutout
3
Motor
4
Hot wire
18
PYQ 2025
medium
air-conditioning-and-refrigeration ID: cbse-cla
It is not a water cooled condenser:
1
Evaporative condenser
2
Double tube condenser
3
Shell and coil condenser
4
Shell and tube condenser