In the structural diagram of the centrifugal fan ВЦД - 32M, positions 5, 7, 8 correspond to:

Guide part, spiral casing, electric motor.

Working wheel, shaft, shaft coupling.

Guide part, spiral casing, shaft coupling.

Working wheel, hub, electric motor.

In the structural diagram of the centrifugal fan ВЦД - 32M, positions 1, 3, 4 correspond to:

Guide part, spiral casing, mechanical part to rotate the blades.

Working wheel, shaft, shaft coupling.

Guide part, spiral casing, shaft, shaft coupling.

Working wheel, hub, mechanical part to rotate the blades.

To adjust the capacity and pressure in the centrifugal fan ВЦД - 32M, it is necessary to adjust ...

the voltage applied to the motor

The advantage of the centrifugal fan compared to the axial fan of the same power is:

medium flow, low noise, low speed

small flow, high noise, low speed

large flow, high noise, high speed

The axial fan YBT - 5.5 is used for:

ventilating a preparation tunnel, or a single-direction tunnel, or a shop tunnel where the main ventilation system cannot provide air

ventilating a preparation tunnel, or a single-direction tunnel

ventilating multiple preparation tunnels, or a single-direction tunnel, or a shop tunnel where the main ventilation system cannot provide air

ventilating multiple preparation tunnels, or two area tunnels, or a shop tunnel where the main ventilation system cannot provide air

In the structural diagram of the axial fan, positions 1,2,3,4 correspond to:

working wheel, blades, guide part, straightening part

front sliding surface, rear sliding surface, inlet, air duct

working wheel, blades, inlet, air duct

front sliding surface, rear sliding surface, guide part, straightening part

In the structural diagram of the axial fan, positions 5,6,7,8 correspond to:

front sliding surface, rear sliding surface, inlet, outlet

front sliding surface, rear sliding surface, inlet, air duct

working wheel, blades, inlet, air duct

front sliding surface, rear sliding surface, guide part, straightening part

The guide part placed in front of each working wheel in the axial fan has the effect of directing the airflow into the working wheel easily, ...

overcoming the vortex of the air, while adjusting the capacity and pressure of the fan

overcoming the vortex of the air, while adjusting the pressure

What is the purpose of the straightening device placed behind the impeller in axial fans?

To eliminate air vortexes and adjust the efficiency and pressure of the fan.

To eliminate air vortexes and adjust the pressure of the fan.

To adjust the efficiency and pressure of the fan.

What does the straightening device do in axial fans?

Directs air out of the fan to avoid energy loss.

Directs air into the fan to avoid energy loss.

Directs air out of the fan to conserve energy.

Directs air within the fan to avoid energy loss.

What is the aerodynamic shape of sliding surfaces in axial fans suitable for?

Allowing air to easily enter and exit the impeller while avoiding air vortexes and reducing energy loss.

Allowing air to easily enter the impeller while avoiding air vortexes and reducing energy loss.

Allowing air to easily exit the impeller while avoiding air vortexes and reducing energy loss.

Allowing the impeller to easily operate while avoiding air vortexes and reducing energy loss.

What is the advantage of axial fans compared to centrifugal fans of the same power?

Higher efficiency by 2 to 3%, higher air speed, compact size, lightweight.

Higher efficiency by 2 to 3%, average air speed, larger size, lightweight.

Higher efficiency by 1 to 2%, higher air speed, compact size, lightweight.

Higher efficiency by 2 to 3%, average air speed, compact size, lightweight.

To ensure safety, what must be fully equipped in the fan station besides protective devices?

Fire prevention equipment, lighting system, communication phone.

Protection system, explosion prevention equipment, lighting system.

Fire prevention equipment, lighting system.

What must the fan system have?

fire protection equipment, protection system, lighting system.

fire protection equipment, lighting system, communication phone.

protection system, explosion prevention equipment, lighting system.

protection system, backup duct, lighting system.

When the main fan stops and the backup fan is broken, what must be done immediately?

cut off the power, hand over to the next shift.

open the air door for natural ventilation.

When the main fan is operating normally, when must the backup fan be allowed to operate?

when the air door is not tightly closed.

when the explosive gas volume decreases.

when the methane gas content exceeds the allowable limit.

For a mine with explosive gas and dust, what is the minimum requirement for a backup fan motor?

at the nearest position on the surface.

When wanting to stop or change the working mode of the fan, whose order must be followed?

the mine management board or the ventilation workshop manager.

When operating the fan station, what must be done to reduce...

power when running at rated capacity.

When operating, the fan must be stopped immediately if there are signs of...

the motor making unusual noises, smoke, burning smell, or any part is overheating, the fan blades are bent, lack of oil.

the duct is slightly torn if it is a local fan.

lack of lubrication oil while the fan is working.

When the fan blades are rotating, the amount of air in front of the blades is pushed away, so the pressure at the blade area...

decreases, the amount of air behind flows into the area of reduced pressure.

increases, the amount of air behind flows into the area of reduced pressure.

decreases, the amount of air behind flows into the area of increased pressure.

increases, the amount of air behind flows into the area of increased pressure.

When must two fans be used in a joint operation?

using the corner ventilation method; many toxic gases appear; the resistance of the tunnel increases.

using the symmetrical ventilation method; toxic gases are released a lot; the resistance of the tunnel increases.

using the corner ventilation method; toxic gases are released a lot; the tunnel is getting larger.

using the mixed ventilation method; toxic gases are released a lot; the tunnel is getting deeper.

When changing the wind direction in the tunnel, what method is usually used?

by closing or opening the air ducts at the fan station.

When changing the wind direction in the tunnel, what method is usually used?

Closing or opening the air ducts at the fan station.

Closing the suction air duct at the fan station.

Opening the blowing air duct at the fan station.

The rotation direction of the fan motor.

Power supply for the fan, the motor does not rotate and makes a loud noise, the cause is due to ...

The motor is running in reverse.

When the fan or fan motor is working, it vibrates, the cause is due to ...

The electric motor is out of phase, some rotating parts are eccentric.

The working wheel is unbalanced, rotating eccentrically, the foundation bolts are loose.

The air duct is leaking, some rotating parts are eccentric, the foundation bolts are loose.

The fan blades are warped, the foundation bolts are loose.

Câu hỏi trắc nghiệm về quạt gió

Authored by Thang Chiu

Others

1st - 5th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Flow rate.

Pressure.

Productivity.

Static pressure.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Flow rate.

Pressure.

Productivity.

Static pressure.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

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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?

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

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

What is the purpose of ventilation in underground mines?

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

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

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

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

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

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

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