Quiz Questions

Question 1 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 2 1 Marks

What is the effect of moist air present inside the hermetic system?

A

Capacity of compressor will increase

B

Less wear and tear in compressor

C

Harmful to the compressor and motor

D

Increase the life of compressor

Question 3 1 Marks

Which winding has high inductance value in CSR compressor motor?

A

Common winding

B

Running winding

C

Starting winding

D

Auxiliary winding

Question 4 1 Marks

What are the passive components used in
electronic circuits?

A

Resistors, capacitors and inductors

B

Transformers and semiconductors

C

Semi conductors and transistors

D

Transistors, diodes and SCRs

Question 5 1 Marks

Which part of a central AC system cannot be repaired after pump down operation?

A

Condenser

B

Evaporator

C

Liquid receiver

D

Expansion device

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 part of water pump becomes worn out fast?

A

Bearing

B

Impeller

C

Water seal

D

Shaft sleeve

Question 8 1 Marks

What type of material is used to support the tubes on both sides of air cooled condenser?

A

Copper sheets

B

Mild steel sheet

C

Aluminium sheets

D

Galvanised iron sheets

Question 9 1 Marks

What is the percentage of HCl used for making descaling solution with water?

A

0.01

B

0.05

C

0.15

D

0.55

Question 10 1 Marks

Which sheet is used to check the tigtness of door gasket of a refrigerator?

A

Rubber

B

Plastic

C

Copper

D

Zinc

Question 11 1 Marks

How the total heat of air is represented in psychrometric chart?

A

Entropy

B

Enthalpy

C

Latent heat

D

Sensible heat

Question 12 1 Marks

Which movement of the scroll compresses the low pressure vapour in scroll compressor?

A

Reciprocating

B

Centrifugal

C

Rotating

D

Orbital

Question 13 1 Marks

How the indoor unit acts during heating cycle of heat pump?

A

Condenser

B

Evaporator

C

Expansion device

D

Electrical heater

Question 14 1 Marks

Which type of expansion device is used in frost free refrigerator?

A

Float valve

B

Capillary tube

C

Automatic expansion valve

D

Thermostatic expansion valve

Question 15 1 Marks

What is ensured before mounting condenser in car AC?

A

Accessibility for future service

B

Condenser top line to TEV inlet

C

Condenser in line with car radiator

D

Condenser bottom line to discharge line

Question 16 1 Marks

Which material is used to make ducts in split AC?

A

Thermocole

B

GI sheet

C

Wood

D

Fibre

Question 17 1 Marks

Which metal is alloyed with zinc to make brass?

A

Iron

B

Copper

C

Bronze

D

Aluminium

Question 18 1 Marks

What is the remedy for no lubrication even if the sight glass shows proper oil level?

A

Replace oil pump

B

Add oil to crankcase

C

Replace oil pressure gauge

D

Replace oil pressure cut out

Question 19 1 Marks

Which tool is used for bending, seaming and forming of sheet metal?

A

Bench vice

B

Hand vice

C

Stakes

D

Shear

Question 20 1 Marks

Which types of heat are involved in ventilation and infiltration of air to AC space?

A

Sensible heat and solar heat

B

Sensible heat and latent heat

C

Radiant heat and specific heat

D

Latent heat of water-vapour only

Question 21 1 Marks

Which component actuates the defrost cycle in frost free refrigerator?

A

Bimetal thermo

B

Defrost heater

C

Timer

D

Relay

Question 22 1 Marks

Which lubricant oil is used in swash plate of R 134a compressor?

A

Servo 20

B

POE

C

SAE - 40

D

Mineral oil

Question 23 1 Marks

Which two components do the compressor function in vapour absorption system?

A

Generator and absorber

B

Generator and separator

C

Generator and condenser

D

Generator and evaporator

Question 24 1 Marks

Which parameter of power supply determines the speed of induction motor?

A

Volt

B

Current

C

Volume

D

Frequency

Question 25 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