Quiz Questions

TRADE THEORY MONTHLY TEST (ITISKILL5541QO)

Q-Paper A-Paper
Question 1 1 Marks
Why the capillary tube is preferred as an
expansion device?
A
No system pressure equalising
B
Inexpensive and has no moving parts
C
Expensive and more moving parts
D
Periodical servicing is required
Question 2 1 Marks
What is the reason for frost accumulation in
between fins and tubes of evaporator in frost free
refrigerator?
A
Under charge of refrigerant
B
Over charge of refrigerant
C
Defective fan motor
D
Defective timer
Question 3 1 Marks
What are the causes for blockage in
capillary tube?
A
Non condensable gases
B
Moisture and wax from oil
C
Solid particles
D
Over charging of refrigerant
Question 4 1 Marks
Why there is no frosting at the bottom only in plate coil evaporator used with refrigerator?
A
Shortage of refrigerant
B
Oil present in the coil
C
Excess of refrigerant
D
Liquid in the coil
Question 5 1 Marks
What is the effect of pressure drop at the inlet of the evaporator?
A
Flashing of liquid refrigerant
B
Freezing of liquid refrigerant
C
Freezing of liquid
D
Boiling of oil
Question 6 1 Marks
Why frost accumulates in window AC evaporator?
A
Over charge of refrigerant
B
Less charge of refrigerant
C
Capillary chocking
D
Air filter blocked
Question 7 1 Marks
What is the use of dehydrator?
A
Absorb oil
B
Absorb heat
C
Absorb refrigerant
D
Absorb moisture
Question 8 1 Marks
What is the process of accumulation of ice on the surface of evaporator?
A
Frosting
B
Defrosting
C
Evacuating
D
Melting of frost
Question 9 1 Marks
What is the physical change of refrigerant in evaporator?
A
Solid to liquid
B
Vapour to solid
C
Liquid to vapour
D
Vapour to liquid
Question 10 1 Marks
Which expansion valve is suitable for constant load operation?
A
King valve
B
Relief valve
C
Low side float valve
D
Automatic expansion valve
Question 11 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 12 1 Marks
What is the category of R 290 refrigerant?
A
Halocarbons
B
Azeotropes
C
Hydrocarbons
D
Organic compounds
Question 13 1 Marks
What type of heat is absorbed by primary refrigerant?
A
Total heat
B
Latent heat
C
Specific heat
D
Sensible heat
Question 14 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 15 1 Marks
Which international agency standardises the numbering system for identifying refrigerants?
A
ASHRAE
B
ISHRAE
C
DW142
D
ISO
Question 16 1 Marks
What is the ozone depleting potential of R 134a Refrigerant?
A
0
B
1
C
2
D
3
Question 17 1 Marks
What is the category of R 502 refrigerant?
A
Azeotropes
B
Halocarbon
C
Hydrocarbon
D
Organic compounds
Question 18 1 Marks
What is the category of R 407c refrigerant?
A
Azeotropes
B
Zeotropes
C
Inorganic
D
Organic
Question 19 1 Marks
What is the cylinder colour code of R 22 refrigerant?
A
White
B
Green
C
Orchid
D
Orange
Question 20 1 Marks
Which is the inorganic refrigerant?
A
R 170
B
R 500
C
R 630
D
R 717
Question 21 1 Marks
Which refrigerant is inactive to ozone layer?
A
R 12
B
R 13
C
R 22
D
R 134a
Question 22 1 Marks
Which is the numerical designation of ammonia refrigerant?
A
700 + ( Molecular mass of NH3) = 717
B
700 + (Molecular mass of NH3) = 718
C
700 + (Molecular mass of NH3) = 719
D
700 + (Molecular mass of NH 3) = 720
Question 23 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 24 1 Marks
How many hydrogen atoms are present in R 134a?
A
One
B
Two
C
Four
D
Three
Question 25 1 Marks
What is the effect of releasing HCFC refrigerants to atmosphere?
A
Increases ODP and GWP
B
Decreases GWP and ODP
C
Decreases TEWI
D
Inactive to TEWI