Compressors, Fans, and Blowers Test Questions with Answers
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Module
Compressors, Fans, and Blowers
Institution
Compressors, Fans, And Blowers
Compressors, Fans, and Blowers Test Questions with Answers
The flow of air or gas is carried by the __________ created by the energy transmitted to the gas by the rotating wheel - Answer-pressure differential
If no resistance to flow exists, no inlet and outlet duct, the fan provides the gas w...
Compressors, Fans, and Blowers
Test Questions with Answers
The flow of air or gas is carried by the __________ created by the energy transmitted to
the gas by the rotating wheel - Answer-pressure differential
If no resistance to flow exists, no inlet and outlet duct, the fan provides the gas with
________ only, and no compression or rarefaction occurs. - Answer-velocity energy
It consists of an impeller of the squirrel-cage type, operating within a scroll-type housing
and including driving mechanism supports either for belt drive or direct connections. -
Answer-Centrifugal Fan
Gas enters the inlet in a direction substantially parallel with the impeller axis and turns
through an angle of approximately 90, flowing radially through the wheel and issuing
from the wheel periphery. - Answer-Centrifugal Fan
The scroll-type housing serves to convert part of the kinetic energy imparted to the gas
into potential or static pressure energy. - Answer-Centrifugal Fan
Designed for moving large volumes of air against a small plenum. Usual pressure up to
25 in. WG. Special fans up to 90 in. WG. - Answer-Centrifugal Fan
General Wheel Types of Centrifugal Fan - Answer-Straight-blade fan
Forward-curved blade fan
Backward curved blade fan
__________ have rotors of comparatively large diameter with a few (5 to 12) radial
blades resembling paddle wheels. These fans operate comparatively at low speed.
They are often used in exhaust work particularly where wastes are carried into the air
stream. - Answer-Straight-blade fan
_______________ usually of multiblade (20-64) "siruco type". The rotors are of smaller
diameter and they operate at higher speed than straight blade units. - Answer-Forward-
curved blade fan
__________ are of the multi-blade (10-50) type. Such fans have wide range of
usefulness. - Answer-Backward curved blade fan
, It has a wheel of the propeller or disk type, operating within a mounting ring or
cylindrical housing. Gas flow is essentially parallel to the wheel axis at both inlet and
outlet. - Answer-Axial- Flow Fan
General Wheel Types of Axial- Flow Fan - Answer-Propeller fan
Tube-Axial fan
Vane-axial fan
it consists of a propeller or disk type wheel within a mounting ring or plate and including
driving mechanism supports either for belt drive or direct connection. Designed to move
air from one enclosed space to another from outdoor to indoor, or vice versa in a wide
range of volume at low pressure (0 to 1 in. WG) - Answer-Propeller fan
It consists of a propeller or disk-type wheel within a cylinder and including driving
mechanism supports for either for belt or direct connection
Designed to move wide range of air and gas volume at medium pressure (1/4 to 2½ in.
WG) - Answer-Tube-Axial fan
it consists of disk-type wheel with a cylinder, a set of air guide vanes located either
before r after the wheel including driving mechanism supports either for belt drive or
direct. - Answer-Vane-axial fan
Designed to move air volume of a wide range and usual pressure is ½ to 6. in WG.
Special design up to 60 in. WG or higher. - Answer-Vane-axial fan
The work done in moving a given volume (or weight) of air at a given speed. - Answer-
Air horsepower
A fan used to force air under pressure, that is, the resistance to gas flow is imposed
primarily upon the discharge. - Answer-Blower
The work done by an electric motor in driving the fan, measured as horsepower
delivered to the fan shaft. - Answer-Brake horsepower
The physical volume of air moved by a fan per minute expressed as fan outlet
conditions. - Answer-Cubic feet per minute (cfm)
The actual weight of air in pounds per cubic foot (0.075 at 70°F and 29.92 inches
mercury barometric pressure) - Answer-Density
A fan used to withdraw air under suction, that is, the resistance to gas flow is imposed
primarily upon the inlet. - Answer-Exhauster
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