CENTRAL AIR CONDITIONING - Practice Mode

1) What is the purpose of cooling tower in central AC plant?

Cool the chilled water Maintain refrigerant flow Cool the liquid refrigerant Cool the condenser water

Correct Answer: Cool the condenser water

2) Which part of water pump becomes worn out fast?

Bearing Impeller Water seal Shaft sleeve

Correct Answer: Shaft sleeve

3) What is the preventive maintenance of cooling tower sump?

Remove sludge Flush with water Add HCL to water Add bleaching powder

Correct Answer: Remove sludge

4) Which suction line pressure ensures that the compressor is to be stopped during pump down operation?

3 kg/cm<sup>2</sup> 5 kg/cm<sup>2</sup> 0.5 kg/cm<sup>2</sup> (- 0.5 kg/cm<sup>2</sup>)

Correct Answer: 0.5 kg/cm<sup>2</sup>

5) Which device is used to measure the static and total pressure of air in ducting systems?

Pitot tube Gauge manifold Pressure gauge Compound gauge

Correct Answer: Pitot tube

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