Fans Flashcards
What is the primary function of a fan in a millwright system?
To move air or gas to provide ventilation or cooling.
True or False: Centrifugal fans are typically used for high-pressure applications.
True
Fill in the blank: The __________ fan operates by drawing air in parallel to the axis of rotation.
axial
What type of fan is best for low-pressure, high-volume applications?
Axial fan
What is the common unit of measurement for fan airflow?
Cubic feet per minute (CFM)
Which fan type is known for its ability to handle particulate-laden air?
Centrifugal fan
What does the term ‘fan efficiency’ refer to?
The ratio of useful power output to the power input.
True or False: Fans operate on the principle of Bernoulli’s theorem.
True
What is the purpose of a fan’s impeller?
To increase the velocity of the air or gas.
List one common application of exhaust fans.
Removing stale air from kitchens or bathrooms.
What is the typical range of fan speeds in RPM (revolutions per minute)?
1,000 to 3,600 RPM
True or False: The larger the fan diameter, the more air it can move.
True
What is a common cause of fan vibration?
Imbalance in the fan blades.
Fill in the blank: Fan __________ is the measure of resistance to airflow.
static pressure
What is the role of fan bearings?
To support the rotating shaft and allow smooth rotation.
Which type of fan is more energy-efficient at moving large volumes of air?
Centrifugal fan
True or False: The pitch of fan blades can affect airflow and efficiency.
True
What is the significance of the fan curve?
It shows the relationship between airflow and static pressure.
What does ‘NPSH’ stand for in fan applications?
Net Positive Suction Head
What does the term ‘fan sound power level’ refer to?
The sound energy emitted by the fan during operation.
Fill in the blank: The __________ of a fan is determined by its design and operating conditions.
performance
What is the difference between forward-curved and backward-curved fan blades?
Forward-curved blades are more efficient at low flow rates, while backward-curved blades handle higher flow rates better.
What is the purpose of a fan inlet duct?
To improve airflow and reduce turbulence.
True or False: The angle of the fan blades can dramatically affect performance.
True