Related Questions

Lewis equation in gears is used to find the
A Tensile stress in bending
B Shear stress
C Compressive stress in bending
D Fatigue stress
নিচের কোনটি লুইস ( Lewis ) এসিড?
A         SO3 
B BF3
C  H+
D সবগুলো
Which of the following is not a Lewis acid?
A aluminium chloride
B sodium ion
C sulphur tetrafluoride
D hydroxide ion
Which is not a Lewis acid?
A AlCl3
B BF3
C NH3
D FeCl3
The value of Lewis form factor used in design of gears is
A Dependent on number of teeth of a gear
B Dependent on system of teeth
C Independent of size of teeth
D All of these
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively
A [

A.

B. 1 and 0

B >1 and ≈ 1
C 0 and ≈ 1
For which of the following unit operations, Lewis number is of significance?
A Adsorption
B Binary distillation
C Gas absorption
D Humidification
Lewis number (Le) is
A Sc × Pr
B Pr × St
C Sh × Pr
D St × Sh
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
A Mass diffusivity to momentum diffusivity
B Thermal diffusivity to mass diffusivity
C Momentum diffusivity to thermal diffusivity
D None of these
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
A 0
B 1
C > 1

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