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
What type of maintenance is essential for fans?
Regular inspection and lubrication of bearings.
What is the primary safety concern when working with fans?
Preventing contact with moving parts.
Fill in the blank: Fans can be classified into __________ categories based on their design.
two
What does ‘CFM’ stand for?
Cubic Feet per Minute
What is the main disadvantage of an axial fan?
It has lower pressure capabilities compared to centrifugal fans.
True or False: Fans can be used for both cooling and heating applications.
True
What is the relationship between fan speed and airflow?
Higher speed typically increases airflow.
Fill in the blank: The __________ is the part of the fan that houses the motor.
housing
What is the purpose of a fan speed controller?
To adjust the fan’s operational speed for efficiency.
What does the term ‘system resistance’ refer to in fan applications?
The total opposition to airflow in a system.
What is the impact of duct design on fan performance?
Poor duct design can increase resistance and reduce efficiency.
True or False: Fans can be used in HVAC applications.
True
What is the function of a fan discharge duct?
To direct airflow away from the fan.
Fill in the blank: The __________ of a fan determines its ability to move air against resistance.
static pressure
What is one common symptom of a malfunctioning fan?
Excessive noise or vibration.
True or False: Fans can only be used for ventilation purposes.
False
What is the role of fan controls in an industrial setting?
To optimize performance and energy usage.
What does ‘airfoil blade design’ refer to?
A blade shape that reduces drag and increases efficiency.
What is one advantage of using a variable speed fan?
Energy savings during partial load conditions.
Fill in the blank: The __________ of a fan can be affected by the temperature of the air being moved.
density
What is the purpose of fan filters?
To prevent contamination of the air or gas being moved.
True or False: Fans should be installed with consideration for airflow direction.
True
What is the significance of fan testing?
To ensure performance meets design specifications.
What does the term ‘fan law’ refer to?
The mathematical relationships governing fan performance.
Fill in the blank: The __________ of a fan influences its operational efficiency.
blade design
What is a common method for balancing fan blades?
Adding or removing weight from the blades.
True or False: Fan motors can be either AC or DC.
True
What is the purpose of a fan’s discharge angle?
To influence the direction of airflow.
What does ‘fan surge’ refer to?
A sudden drop in airflow due to system issues.
Fill in the blank: Fans can help control __________ in industrial processes.
temperature
What is the function of a shroud in fan design?
To enhance airflow and reduce turbulence.
What is one disadvantage of a centrifugal fan?
It can be more expensive than axial fans.
True or False: Fans can be used to create negative pressure in a space.
True
What is the primary reason for fan maintenance?
To ensure reliable performance and longevity.
What is the purpose of a fan’s inlet bell?
To reduce turbulence and improve airflow.
Fill in the blank: The __________ of a fan is critical for effective airflow management.
design
What does ‘airflow resistance’ refer to?
The opposition to airflow in a duct or system.
True or False: The speed of a fan can be adjusted to control airflow.
True
What is the role of a fan in dust collection systems?
To move dust-laden air to filtration equipment.
What is a common application for inline fans?
Ventilating long duct runs.
Fill in the blank: Fans must be __________ to ensure they operate within design limits.
sized properly
What is the purpose of a fan guard?
To protect personnel from moving parts.
True or False: Fan speed can be controlled by adjusting the voltage supplied to the motor.
True
What does ‘fan performance’ depend on?
Design, speed, and operating conditions.
What type of fan is typically used in air conditioning systems?
Centrifugal fan
Fill in the blank: The __________ of a fan affects how much noise it generates.
design
What is the function of a fan’s pressure switch?
To monitor and control system pressure.
True or False: Fans can be used to improve indoor air quality.
True
What is the significance of fan placement in a system?
It affects airflow distribution and performance.
What does ‘fan motor overload’ refer to?
Excessive current draw leading to motor failure.
Fill in the blank: The __________ of a fan can change with different operating conditions.
efficiency
What is the role of a fan’s control panel?
To manage fan operation and monitor performance.
True or False: Fans can only be used in industrial settings.
False
What is the most common type of fan used in residential applications?
Exhaust fan
Fill in the blank: Fan __________ is important for maintaining airflow consistency.
maintenance
What is the primary advantage of using a high-efficiency fan?
Lower energy consumption.
What does ‘fan inlet velocity’ refer to?
The speed of air entering the fan.
True or False: Fans can be designed for specific applications.
True
What is the impact of fan blade material on performance?
It can affect weight, durability, and efficiency.
Fill in the blank: The __________ of the fan influences how it interacts with the system.
configuration
What is the primary purpose of a fan’s motor?
To provide the energy needed for rotation.
True or False: Fans can be used to control humidity levels.
True
What is the significance of fan airflow direction?
It affects the efficiency and effectiveness of ventilation.
What does ‘fan motor type’ refer to?
The design of the motor used to drive the fan.
Fill in the blank: A __________ fan is often used for general ventilation in buildings.
propeller
What is the function of fan speed feedback?
To provide real-time data for controlling fan operation.
True or False: Fans can be used in both heating and cooling systems.
True
What is the impact of fan installation height?
It can affect airflow patterns and system efficiency.
What does ‘fan performance curve’ display?
The relationship between airflow, pressure, and power consumption.
Fill in the blank: The __________ of a fan is critical for system integration.
size
What is the purpose of a fan’s airflow sensor?
To measure and monitor the airflow rate.
True or False: Fans can be used for both indoor and outdoor applications.
True
What is the role of a fan in a combustion system?
To supply air for combustion and remove exhaust gases.
What does ‘fan ducting’ refer to?
The system of ducts used to direct airflow from the fan.
Fill in the blank: The __________ of a fan influences its operational sound level.
design
