MCQs / Q&A

For a turbine agitated and baffled tank, operating at low Reynold’s number (based on impeller diameter), the power number (Np) varies with NRe as_________________?

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For a turbine agitated and baffled tank, operating at low Reynold’s number (based on impeller diameter), the power number (Np) varies with NRe as_________________?

A. Np ∝ NRe
B. Np ∝ √NRe
C. Np → constant
D. Np ∝ 1/NRe (Correct)

 

Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?

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Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?

A. Chlorination
B. Treating in biological oxygen pond (Correct)
C. Chemical coagulation
D. None of these

 

The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?

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The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?

A. dq/dx = K (Correct)
B. dq/dx = K.q
C. dq/dx = K/q
D. dq/dx = Kq2