Fluid Mechanics & Hydraulics (3140611) MCQs

MCQs of Dimensional Analysis and Similitude

Showing 21 to 28 out of 28 Questions
1 2 3
21.
If force(F), length(L) & time(T) are the fundamental units , then the dimensional formula of mass is
(a) [FL-1T2]
(b) [FL-1T-2]
(c) [FLT-2]
(d) [FL-1T-1]
Answer:

Option (a)

22.
The ratio of dimensions of Planck’s constant and that of moment of inertia is the dimensions of
(a) Frequency
(b) Velocity
(c) Angular Momentum
(d) Time
Answer:

Option (a)

23.
The dimensional formula of Relative density is
(a) [ML-3]
(b) [MLT-1]
(c) [MLT-2]
(d) Dimensionless
Answer:

Option (d)

24.
In a system of unit of force (F), Time (T) & acceleration (A) , Energy has dimensions
(a) [FAT2]
(b) [FA2T]
(c) [FA2T2]
(d) [FLT]
Answer:

Option (a)

25.
Reynold's number is significant in
(a) supersonics as with projectile and jet propulsion
(b) full immersions or completely enclosed flow with pipes, aircraft, etc.
(c) simultaneous motion through fluids where there is a surface of discontinuity, gravity forces, wave making effects, etc.
(d) all of the above
Answer:

Option (b)

26.
Mach number is significant in
(a) supersonics as with projectile and jet propulsion
(b) full immersions or completely enclosed flow with pipes, aircraft, etc.
(c) simultaneous motion through fluids where there is a surface of discontinuity, gravity forces, wave making effects, etc.
(d) all of the above
Answer:

Option (a)

27.
The dimensional formula of coefficient of viscosity is
(a) [MLT-1] 
(b) [M-1L2T-2]
(c) [ML-1T-1]
(d) none of these
Answer:

Option (c)

28.
Which of the following equations is not dimensionally homogeneous? Consider standard symbols for quantities.
(a) Force, F=ma
(b) Head loss due to friction, hf=fLv22gD
(c) Torque, T=FL
(d) None of the above
Answer:

Option (d)

Showing 21 to 28 out of 28 Questions
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