In which of the following exhaust fan air flows radially (diverging from the center):

Which of the following voltage rating of fan are less likely available in market

Higher speed motors are usually quieter than low speed motors:

While installation the exhaust fan and air intake opening are at _____ ends of the enclosure:

Net intake air provided shall be atleast ________ greater than the exhaust fan opening:

Which of the exhaust fans are used when duct system is involved:

A direct drive type fan is less expensive, less noisy, more flexible and more adaptable to capacity change than belt drive fan

Fan speed delivery will vary ______ as the CFM ratio:

Fan pressure will vary directly as ____ of the rpm ratio of the fan:

Brake Horsepower (bhp) on the fan motor (or air horsepower of the fan) will vary directly as the _____ of the rpm ratio:

When two identical fans are operated in series then the cfm is doubled:

When fans are operated in parallel, total air flow is equal to:

Which of the fan has disc wheel within a ring casing or plate:

Which of the following arrangement of fans will be used inorder to attain constant pressure, zero pressure and constant vacuum conditions: