Quiz Questions

Question 1 1 Marks

Which process absorbs heat from the cabinet in refrigerator?

A

Expansion

B

Compression

C

Evaporation

D

Condensation

Question 2 1 Marks

How the zeotropic refrigerant is taken from the cylinder for charging it into RAC system?

A

Liquid state

B

Vapour state

C

Vapour and liquid

D

Super heated vapour

Question 3 1 Marks

Which type of compressor is used as a vacuum pump?

A

Reciprocating

B

Centrifugal

C

Rotary

D

Scroll

Question 4 1 Marks

What is the function of refrigerant fluid in a refrigerator?

A

Releases heat inside the cabinet

B

Absorbs heat from inside the cabinet

C

Absorbs heat from outside the cabinet

D

Absorbs heat from bottom side cabinet

Question 5 1 Marks

Which terminals are momentarily shorted to start the compressor motor without relay?

A

C and S terminal

B

S and R terminal

C

C and R terminal

D

S and compressor body

Question 6 1 Marks

How does the evaporator frost affect the sub zero temperature thermally in refrigerator?

A

As conductor

B

As insulator

C

As convector

D

As radiator

Question 7 1 Marks

Which is the hydrocarbon refrigerant?

A

R 12

B

R123

C

R 500

D

R 600a

Question 8 1 Marks

Which refrigerant is used in domestic refrigerator?

A

R 22

B

R 32

C

R 134 a

D

R 407 c

Question 9 1 Marks

What is ensured before removing a leaky evaporator in a refrigerator?

A

Recharge refrigerant to the system

B

Check the drain tray of evaporator

C

Removal of the thermostat sensor

D

Pressurize the system with refrigerant

Question 10 1 Marks

Which two tubes act as heat exchanger in a refrigerator?

A

Suction and charging tube

B

Discharge and suction tube

C

Capillary and suction tube

D

Discharge and capillary tube

Question 11 1 Marks

Which type of motor drive is used in hermetic compressor in refrigerator?

A

Belt drive

B

Gear drive

C

Direct drive

D

Push drive

Question 12 1 Marks

What is the fault in compressor motor if there is electrical continuity between the dome and motor terminal?

A

Shorted run winding

B

Open common terminal

C

Shorted start winding

D

Grounded compressor motor

Question 13 1 Marks

What is the minimum distance to be maintained between the wall and refrigerator condenser?

A

13 cm

B

15 cm

C

18 cm

D

22 cm

Question 14 1 Marks

Which two terminals read the highest resistance while testing refrigerator compressor motor?

A

Start and run

B

Common and run

C

Start and common

D

Start and compressor body

Question 15 1 Marks

Which refrigerant is highly flammable?

A

HC - Hydro carbon

B

HFC - Hydro fluoro carbon

C

CFC - Chloro fluoro carbon

D

HCFC - Hydro chloro fluoro carbon

Question 16 1 Marks

Which component absorbs the maximum heat from the cabinet materials in frost free refrigerator?

A

Condenser

B

Evaporator

C

Compressor

D

Expansion valve

Question 17 1 Marks

Which gas is used for pressurising and testing leakage of RAC system?

A

O2

B

N2

C

O3

D

SO2

Question 18 1 Marks

Which component rejects the maximum heat to ambinet air in refrigerator?

A

Expansion valve

B

Compressor

C

Condenser

D

Evaporator

Question 19 1 Marks

What is the reason for filter drier sweating in refrigerator?

A

Nitrogen in the system

B

Moisture in the system

C

Oxygen in the system

D

Oil in the system

Question 20 1 Marks

What is the full form of the relay - PTC?

A

Positive temperature coefficient

B

Permanent temperature control

C

Polar terminal checking

D

Positive terminal circuit

Question 21 1 Marks

How the potential relay coil is connected internally to the relay terminals?

A

5 and 1

B

5 and 4

C

5 and 2

D

2 and 4

Question 22 1 Marks

Which part of the refrigerator cools the liquid refrigerant in capillary tube?

A

Discharge line

B

Suction line

C

Condenser

D

Evaporator

Question 23 1 Marks

What is the resistance level of start winding in a refrigerator s compressor motor?

A

Medium resistance

B

High resistance

C

Zero resistance

D

Low resistance

Question 24 1 Marks

What is the name of heat carrying medium in vapour compression system?

A

Air

B

Water

C

Liquid

D

Refrigerant

Question 25 1 Marks

Which material is used to make the evaporator of refrigerator?

A

Galvanised iron

B

Stainless steel

C

Aluminium

D

Brass

Question 26 1 Marks

Which refrigerant property is desirable for V.C system?

A

Low boiling point

B

Corrosive to metals

C

Low latent heat valve

D

Low Dielectric strength

Question 27 1 Marks

Which refrigerant blend is highly flammable?

A

HCFC

B

HFC

C

CFC

D

HC

Question 28 1 Marks

Which method is used to check the leakage of hydro fluoro carbon refrigerants?

A

Electric torch

B

Litmus paper

C

Sulphur candles

D

Electronic leak detector