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Engineering :: Fluid Mechanics and Solid Handling


31.  Poise (P) is the unit of dynamic viscosity and one Poise is equal to
A. 1 N.s/m2 B. 1 lb/ft.hr
C. 1 g/cm.s D. 1 kg/m.s.

32.  Absolute viscosity expressed in poises is converted to the SI unit of viscosity by multiplication by
A. 1 B. 0.1
C. 0.01 D. 0.001

33.  In converting from the poise to lb/ft.hr one multiplies by
A. 2.04 B. 0.41
C. 2.42 D. 145.2

34.  To convert for the stoke to ft2/s one multiplies by
A. 1-Jan B. (30.48)2
C. (30.48)-2 D. 144

35.  The numerical value of gc. Newtons law proportionality factor is
A. 32.174 lbm.ft/lbf.s2 B. 9.806 kg.m/kgf.s2
C. 1 kg.m/N.s2 D. any of these answers

36.  For ? = 2.49 Poise sp.gr = 0.83 v in Stokes is
A. 2.07 B. 0.3
C. 3 D. 3 x 10-3

37.  For v = 3 St and p = 0.80 g/cm3 in N.s/m2 is
A. 0.375 B. 3.75
C. 0.24 D. 2.4

38.  The viscosity of a gas
A. increases with increase in temperature B. decreases with increase in temperature
C. remains unaffected with change in temperature D. is greater than the viscosity of a liquid

39.  The viscosity of a liquid
A. remains unaffected with change in temperature B. decreases with increase in temperature
C. increases with increase in temperature D. is dependent on pressure only

40.  The property of a fluid by virtue of which it offers resistance to shear is known as
A. density B. surface tension
C. viscosity D. vapor pressure




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