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The electrostatic precipitators have an efficiency characteristic which is related primarily to exposure time i.e. the period during which a dust particle is exposed to the electrostatic field. Exposure time can be increased by

[A].	increasing the cross-sectional area of the precipitator	[B].	increasing its length in the direction of gas flow
[C].	both a and b	[D].	neither a nor b

Answer: Option C

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