| 1. |
The term “_______________” is used when referring to the static pressure |
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System Resistance |
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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. |
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True |
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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. |
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Centrifugal; Axial |
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Axial; Centrifugal |
| 4. |
According to Table-2 on Page-6. What is the disadvantage of Radial fans, with flat blades? |
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Only suitable for low-medium airflow rates |
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High durability |
| 5. |
According to Table-2 on Page-6. What is the advantage of Forward curved fans, with forward curved blades? |
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Fan output is difficult to adjust accurately |
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Low noise level (due to low speed) and well suited for residential heating, ventilation, and air conditioning (HVAC) applications. |
| 6. |
According to the above diagram, what is the name of this specific fan? (Refer to Figure-8)
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Backward Inclined Fan |
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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. |
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Positive |
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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. |
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0.35 to 0.70 kg/cm2 |
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0.70 to 1.4 kg/cm2 |
| 9. |
According to Table-5 on Page-16, are this information TRUE or FALSE?
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True |
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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. |
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decreases |
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increases |
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