Chemical Engg. Fluid Mechanics MCQ's

Id

Question
The fluid property, due to which, mercury does not wet the glass is
A
surface tension
B
viscosity
C
cohesion
D
adhesion
Answer
A
Marks
1
Unit
A1

Id

Question
The dimension of dynamic viscosity is
A
ML-1T-1
B
L2T-1
C
LT-2
D
ML-1T-2
Answer
A
Marks
2
Unit
A1

Id

Question
The fluid, in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.
A
Bingham
B
Newtonian
C
perfect
D
none of these
Answer
C
Marks
1
Unit
A1

Id

Question
Pick out the wrong statement.
A
The shear stress at the pipe (diameter = D, length = L) wall in case of laminar flow of Newtonian fluids is
B
In the equation, the value of 'n' for psuedoplastic and dilatants fluids are 1 respectively.
C
Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion.
D
With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids.
Answer
D
Marks
1
Unit
A1

Question
The fluid property which matters for fall-in rain drops to acquire spherical shape is its
A
pressure
B
height of descend
C
viscosity
D
surface tension
Answer
D
Marks
1
Unit
A1

Id

Question
In an incompressible fluid, the density is
A
Greatly affected by moderate changes in pressure.
B
Greatly affected only by moderate changes in temperature.
C
Not affected with moderate change in temperature &pressure.
D
Sensible to changes in both temperature &pressure.
Answer
C
Marks
1
Unit
A1

Id

Question
An ideal fluid is
A
non-viscous
B
incompressible
C
both (a) &(b)
D
neither (a) &(b)
Answer
C
Marks
1
Unit
A1

Id

Question
With increase in temperature, the vapor pressure of liquids
A
increases
B
increases linearly
C
decreases
D
remains constant
Answer
A
Marks
1
Unit
A1

Id

Question
During fluid flow, variation of shear stress (τ)