Electrical Energy Equipment: Fans and Blowers

Quiz Question

1. The term “_______________” is used when referring to the static pressure
System Resistance
Frictional Component
2. The system resistance is the sum of static pressure losses in the system. The system resistance is a function of the configuration of ducts, pickups, elbows and the pressure drops across equipment, for example bag filter or cyclone.
True
False
3. There exist two main fan types. ________ fans used a rotating impeller to move the air stream. ____ fans move the air stream along the axis of the fan.
Centrifugal; Axial
Axial; Centrifugal
4. According to Table-2 on Page-6. What is the disadvantage of Radial fans, with flat blades?
Only suitable for low-medium airflow rates
High durability
5. According to Table-2 on Page-6. What is the advantage of Forward curved fans, with forward curved blades?
Fan output is difficult to adjust accurately
Low noise level (due to low speed) and well suited for residential heating, ventilation, and air conditioning (HVAC) applications.
6. Electrical Energy Equipment: Fans and Blowers 1
According to the above diagram, what is the name of this specific fan? (Refer to Figure-8)
Backward Inclined Fan
Forward-Curved Fan
7. Blowers can achieve much higher pressures than fans, as high as 1.20 kg/cm2. They are also used to produce _______ pressures for industrial vacuum systems.
Positive
Negative
8. Centrifugal blowers typically operate against pressures of __________ to _________ kg/cm2, but can achieve higher pressures. One characteristic is that airflow tends to drop drastically as system pressure increases, which can be a disadvantage in material conveying systems that depend on a steady air volume. Because of this, they are most often used in applications that are not prone to clogging.
0.35 to 0.70 kg/cm2
0.70 to 1.4 kg/cm2
9. Electrical Energy Equipment: Fans and Blowers 2
According to Table-5 on Page-16, are this information TRUE or FALSE?
True
False
10. The fan efficiency depends on the type of fan and impeller. As the flow rate increases, the efficiency in _________ to certain height (“peak efficiency”) and then decreases with further increasing flow rate.
decreases
increases