DIRECT EXPANSION AIR CONDITIONING

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Refrigeration and Air Conditioning Technician
DIRECT EXPANSION AIR CONDITIONING
Set 6

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Q9946

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What is the reason for short cycling of LP control switch in AC plant?

A Excess of water flow

B Excess of refrigerant

C Shortage of water flow

D Shortage of refrigerant

Q9947

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Which parameters in log sheet indicate the air blocking in ducts?

A All grille temperatures

B Liquid line temperature

C Inlet and outlet temperature of chillier

D Temperatures in chilled water system

Q9948

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What is the effect on system performance if the AC system is at undercharged condition?

A Poor cooling

B Excess cooling

C Compressor over loading

D Compressor trips by HP cut out

Q9949

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What is the cause of oil foaming in compressor crankcase at the time of starting?

A Poor condensation

B Damaged oil separator

C Excess oil in crankcase

D Defective oil heater/circuit

Q9950

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Why the LP cut out control is bypassed electrically before pump down operation?

A Avoid oil foaming

B Prevent liquid entry to compressor

C Increase current of the compressor motor

D To lower the suction pressure close to 0.5 kg/cm<sup>2</sup>

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