1.1 Screening

What is the purpose of wastewater screening in the treatment process?

• To adjust pH levels

• To remove dissolved chemicals

• To remove large debris and solids

• To neutralize pathogens

What is the main disadvantage of using a manually cleaned bar screen in wastewater treatment?

• High maintenance requirements

• Low debris capture efficiency

• Inability to handle high flow rates

• Excessive energy consumption

How does the inclination angle of a bar screen affect its performance?

• Higher angle improves performance

• Lower angle improves performance

• Inclination angle has no effect

• Performance varies with flow rate

What is the purpose of a rotary drum screen in wastewater treatment?

• To disinfect wastewater

• To remove dissolved chemicals

• To aggregate particles

• To capture small debris

How does hydraulic loading rate affect the performance of a bar screen?

• Higher loading rate improves performance

• Lower loading rate improves performance

• Loading rate has no effect

• Performance varies with screen size

Which type of screen relies on gravity for cleaning itself?

• Mechanically cleaned screen

• Fine screen

• Static screen

• Drum screen

How does the rotation speed of a drum screen affect its performance?

• Higher speed improves performance

• Lower speed improves performance

• Speed has no effect

• Performance varies with screen size

How does screen spacing affect the efficiency of a bar screen?

• Closer spacing improves efficiency

• Wider spacing improves efficiency

• Spacing has no effect

• Efficiency varies with screen size

How does the design of a drum screen differ from that of a bar screen?

• Drum screens use rotating belts

• Drum screens have finer openings

• Drum screens use inclined bars

• Drum screens have wider spacing

What is the main safety concern when operating a screening machine?

• Noise pollution

• Material spillage

• Proper guarding and moving parts

• Electrical hazards