Quiz Questions - Theory test - 25-May-2026 04:00 PM

Question 1 1 Marks

Which property is desirable for an ideal refrigerant?

A

High boiling point

B

High freezing point

C

High specify volume

D

High latent heat value

Question 2 1 Marks

What is the category of R 290 refrigerant?

A

Halocarbons

B

Azeotropes

C

Hydrocarbons

D

Organic compounds

Question 3 1 Marks

What type of heat is absorbed by primary refrigerant?

A

Total heat

B

Latent heat

C

Specific heat

D

Sensible heat

Question 4 1 Marks

How much is the maximum capacity of refrigerant to be filled in a returnable service cylinder?

A

Up to 95%

B

Up to 90%

C

Up to 85%

D

Up to 80%

Question 5 1 Marks

What is the desirable property of POE lubricant?

A

Hygroscopic

B

Miscible with HFCs

C

Forms acid with moisture

D

Toxic gas produced during brazing

Question 6 1 Marks

Which insulating material is poured as liquid?

A

Glass Wool

B

Cork Board

C

Wood Shave

D

Poly Urethane Foam (PUF)

Question 7 1 Marks

Which international agency standardises the numbering system for identifying refrigerants?

A

ASHRAE

B

ISHRAE

C

DW142

D

ISO

Question 8 1 Marks

What is the ozone depleting potential of R 134a Refrigerant?

A

0

B

1

C

2

D

3

Question 9 1 Marks

Which is the green house gas?

A

Oxygen of atmospheric air

B

Chlorofluoro carbon in air

C

Helium of atmospheric air

D

Neon of atmospheric air

Question 10 1 Marks

Which gas is universally taken as the basic reference for GWP?

A

SO2

B

CO2

C

NH3

D

AIR

Question 11 1 Marks

What is the category of R 407c refrigerant?

A

Azeotropes

B

Zeotropes

C

Inorganic

D

Organic

Question 12 1 Marks

What is the cylinder colour code of R 22 refrigerant?

A

White

B

Green

C

Orchid

D

Orange

Question 13 1 Marks

Where does the ozone layer exist in atmosphere?

A

Mesosphere

B

Stratosphere

C

Ionosphere

D

Exosphere

Question 14 1 Marks

Which is the inorganic refrigerant?

A

R 170

B

R 500

C

R 630

D

R 717

Question 15 1 Marks

How the refrigerants are classified based on heat absorption by latent and sensible heat?

A

Primary and secondary

B

Organic and inorganic

C

Zeotropic and azeotropic

D

Halocarbons and hydrocarbons

Question 16 1 Marks

Which refrigerant is inactive to ozone layer?

A

R 12

B

R 13

C

R 22

D

R 134a

Question 17 1 Marks

Which substance absorbs heat and directly changes its state from solid to vapour?

A

Ice

B

Dry ice

C

Primary refrigerants

D

Secondary refrigerants

Question 18 1 Marks

Which is the effective method for refrigerant recovery?

A

Condensing unit

B

Charge migration

C

Push pull recovery

D

Use of system's compressor

Question 19 1 Marks

What does the number 4 of R 134a indicate?

A

Number of hydrogen atoms

B

Number of chlorine atoms

C

Number of carbon atoms

D

Number of fluorine atoms

Question 20 1 Marks

How numerical designations of inorganic refrigerants are assigned?

A

Divide 700 to molecular mass of compound

B

Multiply 700 to molecular mass of compound

C

Adding 700 to molecular mass of compound

D

Subtracting 700 from molecular mass of compound

Question 21 1 Marks

How many hydrogen atoms are present in R 134a?

A

One

B

Two

C

Four

D

Three

Question 22 1 Marks

Which refrigerant is used in vapour compression cycle?

A

Secondary refrigerant

B

Primary refrigerant

C

Brine solution

D

Water

Question 23 1 Marks

Which position is safe for storing refrigerant cylinder?

A

Upside down

B

Horizontal

C

Inclined

D

Upright

Question 24 1 Marks

How to prevent the small pieces of glass wool affecting the eyes?

A

Wearing goggles

B

Wearing gloves

C

Using mask

D

Using shoes

Question 25 1 Marks

What is the advantage of universal colour coding of refrigerant cylinders?

A

Easy to identify

B

Make good appearance

C

Prevent corrosion on cylinder

D

Provide extra strength to cylinder