Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

Related Mcqs:

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A. 1.26 h1 B. 0.794 h1 C. 0.574 h1 D. 1.741 h1...

In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?

A. Increases B. Decreases C. Remain constant D. May increase or decrease, depends on the vacuum...

The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?

A. Increases B. Decreases C. Remain constant D. May increase or decrease; depends on the material...

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

A. Approach B. Log mean temperature difference C. Arithmetic mean temperature difference D. Geometric mean temperature difference...

The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?

A. Colburn B. Reynolds C. Prandtl D. None of these...