Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.

Question: A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity
[A].

same as that of A.

[B].

one fourth as that of A.

[C].

twice as that of A.

[D].

four times as that of A.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?
[A].

Increasing the impeller speed and the volute area.

[B].

Increasing the number of vanes in the impeller.

[C].

Mounting of two or more impellers in series on a single shaft.

[D].

Either of (a), (b) or (c).

Answer: Option C

Explanation:

No answer description available for this question.