DIRECT EXPANSION AIR CONDITIONING - Practice Mode

1) What is the benefit of preventive maintenance in AC plant?

Reduce water flow Increase running cost Prevent plant s break down Decrease refrigerant charge

Correct Answer: Prevent plant s break down

2) What is the method of flushing the indoor coils?

Using nitrogen Pressurised air Chemical cleaning Mechanical cleaning

Correct Answer: Using nitrogen

3) Why the temperatures of inlet and outlet water in shell and tube condenser are recorded in log sheet?

Study about the plant Judge quality of water Checking the hardness of water Fix descaling time for condenser

Correct Answer: Fix descaling time for condenser

4) Which parameter of power supply reduces the starting current in VFD motor?

Decreased power factor Increased supply voltage Lower frequency operation Decreased resistance mode

Correct Answer: Lower frequency operation

5) Why the U trap is provided in water drain line of AHU?

Allows air from outside Block dust from outside Prevent entry of foul smell Ensure free flow of drain water

Correct Answer: Prevent entry of foul smell

Explanation:

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