What is the main purpose of fan systems in manufacturing plants?

• To provide lighting

• To increase air flow

• To generate electricity

• To cool down the machinery

What is the difference between a fan and a blower?

• Fans are used for pressure, blowers for suction

• Fans are used for cooling, blowers for heating

• Fans are used for suction, blowers for pressure

• Fans are used for heating, blowers for cooling

What are the two main types of fans mentioned in the text?

• Circular fans and Square fans

• High-pressure fans and Low-pressure fans

• Industrial fans and Residential fans

• Centrifugal fans and Axial fans

What is the advantage of radial fans with flat blades?

• High energy efficiency

• Suitable for low-medium airflow rates

• Can operate at high temperatures

• Can handle high static pressures

Which type of fan is most suitable for residential heating, ventilation, and air conditioning applications?

• Forward curved fans

• Radial fans

• Axial fans

• Backward inclined fans

What is a characteristic of backward inclined fans with airfoil blades?

• High energy efficiency

• Relatively stable due to lift created by blades

• Not suitable for dirty air streams

• Subject to erosion

How do axial fans move the air stream?

• In a circular motion

• Opposite to the fan axis

• Perpendicular to the fan axis

• Along the axis of the fan

What is an advantage of tube-axial fans over propeller fans?

• Not combined with extensive ductwork

• Relatively low noise level

• Generate high airflow rates at low pressures

• Higher energy efficiency

What is a disadvantage of vane-axial fans compared to propeller fans?

• Lower energy efficiency

• Suited for high-pressure applications

• Can quickly accelerate to rated speed

• Relatively inexpensive

What is the main advantage of positive-displacement blowers over centrifugal blowers?

• Higher airflow rates

• Constant volume of air even with varying pressure

• Lower noise levels

• More efficient at high pressures