Câu hỏi trắc nghiệm về quạt gió

What is the form of ventilation with a fixed station on the surface, providing air through all the tunnels of the mine?

• Main ventilation.

• Area ventilation.

• Local ventilation.

• Mixed ventilation.

What is the form of ventilation using 1 to 2 mobile fans to ventilate a single tunnel or a working face?

• Local ventilation.

• Area ventilation.

• Main ventilation.

• Mixed ventilation.

According to the classification based on usage requirements in the tunnel, fans can be categorized into:

• Fans for main ventilation, fans for local ventilation.

• Centrifugal fans, axial fans.

• Low pressure, medium pressure, high pressure.

• Fans with large flow, medium flow, small flow.

What is the purpose of ventilation in underground mines?

• To dilute the amount of explosive gas in the tunnel and reduce air temperature.

• To provide oxygen for workers and reduce dust content in the air.

• To dilute the amount of explosive gas in the tunnel and reduce dust content in the air.

• To reduce air temperature, provide oxygen for workers, dilute and eliminate gases generated in the tunnel, especially methane.

The pressure difference between the two ends of a tunnel is called what?

• Flow rate.

• Pressure.

• Productivity.

• Static pressure.

The amount of air passing through the fan in a unit of time is called what?

• Flow rate.

• Pressure.

• Productivity.

• Static pressure.

When the angle of the guide blade changes, what happens?

• The productivity and pressure of the fan will change.

• The productivity of the fan will change.

• The pressure of the fan will change.

• The productivity and pressure of the fan do not change.

What is the diameter of the centrifugal fan blade ВЦД-32 М?

• 2500 mm

• 3200 mm

• 4500 mm

• 5200 mm

What is the productivity of the centrifugal fan ВЦД - 32M?

• N= 200 ÷ 305m3/h.

• N= 100 ÷ 200m3/h.

• N= 478 ÷ 510m3/h.

• N= 400 ÷ 478m3/h.

What is the pressure of the centrifugal fan ВЦД - 32M?

• H= 478 ÷ 510kg/m2

• H= 400 ÷ 478kg/m2

• H= 200 ÷ 305kg/m2

• H= 100 ÷ 200kg/m2