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Refrigeration and Air Conditioning Technician
DIRECT EXPANSION AIR CONDITIONING
Set 3
Set 3
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Q9931
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What is the benefit of preventive maintenance in AC plant?
A
Reduce water flow
B
Increase running cost
C
Prevent plant s break down
D
Decrease refrigerant charge
Q9932
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What is the method of flushing the indoor coils?
A
Using nitrogen
B
Pressurised air
C
Chemical cleaning
D
Mechanical cleaning
Q9933
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Why the temperatures of inlet and outlet water in shell and tube condenser are recorded in log sheet?
A
Study about the plant
B
Judge quality of water
C
Checking the hardness of water
D
Fix descaling time for condenser
Q9934
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Which parameter of power supply reduces the starting current in VFD motor?
A
Decreased power factor
B
Increased supply voltage
C
Lower frequency operation
D
Decreased resistance mode
Q9935
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Why the U trap is provided in water drain line of AHU?
A
Allows air from outside
B
Block dust from outside
C
Prevent entry of foul smell
D
Ensure free flow of drain water
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