DIRECT EXPANSION AIR CONDITIONING - Quiz

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

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

Using nitrogen Pressurised air Chemical cleaning Mechanical cleaning

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

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

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