To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of_________________?

Related Mcqs:

Value of Peclet number = 0, is the representative of ____________________?

A. Laminar flow B. Complete back mixing C. Plug flow D. Eddy diffusivity = 0...

Steam is preferred to be used as a heating medium in heat exchangers, because of its_________________?

A. Low cost B. High latent heat C. Non-corrosive condensate D. High film co-efficient...

The dust collection efficiency of electrostatic precipitator increases with increase in the_________________?

A. Gas flow rate B. Electrode area C. Both A. & B. D. Neither A. nor B....

The value of fouling factor depends upon the__________________?

A. Characteristic of process fluid B. Velocity of process fluid containing suspended solids C. Suspended solids in the fluid D. All A., B. and C....

Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the__________________?

A. Practical limit reached, due to low heat transfer rate because of inadequate temperature difference B. Economic limit reached, when the plant cost exceeds the saving of steam C. Both A. & B. D. Neither A. nor B....