The curvature of diffuser vane shall be so fixed that the fluid enters the guide passage with minimum loss. This is possible only when
A. the guide vane inlet angle is always less than $$\frac{\pi }{2}$$ rad
B. the diffuser vane entrances angles are laid at same radii for a constant pitch
C. the outlet velocity angle has tangential component only
D. angle between guide vane inlet and the direction of the absolute velocity of air leaving the impeller is small or equal to
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Environment
How the anemometer is used to determine the average velocity of air?
A. Anemometer should be moved throughout the cross section of the roadway
B. It is kept at the roof of the gallery
C. It is laid at the floor of the roadway
D. It is moved along a straight line
The important gaseous pollutants, contributing to acid rains, are
A. SO2 and NOx
B. CO2 and H2S
C. NOx and O3
D. None of the
The delay between the ignition and the application of the heat source termed as
A. lag on ignition
B. incubation period
C. saturation period
D. thermal conductivity
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