41. Ratio of pressure and inertia force gives __________ number.
Weber
Mach
Euler
Froude
✅ The correct answer is option C.
Fluid Mechanics MCQs
42. Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.
Steady uniform
Non-steady uniform
Steady non-uniform
Non-steady non-uniform
✅ The correct answer is option D.
43. Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head.
Elevation
Pressure
Both A and B
Neither A nor B
✅ The correct answer is option B.
44. The losses in open channel flow generally vary as the
Inverse of the roughness
First power of the roughness
Square of the velocity
Inverse square of hydraulic radius
✅ The correct answer is option B.
45. For a reciprocating pump, the indicator diagram is the graph between the
Discharge and overall efficiency
Volume swept by piston for one complete revolution and the pressure in the cylinder
Angle swept by the crank pin at any instant and the discharge
None of these
✅ The correct answer is option B.
46. In which of the following cases, it is possible for flow to occur from low pressure to high pressure?
Flow of liquid upward in a vertical pipe
Flow through a converging section
Flow of air downward in a pipe
Impossible in a constant cross-section conduit
✅ The correct answer is option B.
47. Euler’s equation of motion is a statement expressing
Conservation of mass
Conservation of energy
Newton’s first law of motion
Newton’s second law of motion
✅ The correct answer is option A.
48. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the
Drag on particles
Drag on coloumn walls
Bed height
Bed voidage
✅ The correct answer is option C.
49. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature )
1/√T
1/T
√T
T
✅ The correct answer is option C.
50. The ratio of inertial forces to viscous forces is called the __________ number.
Weber
Mach
Froude
Reynold
✅ The correct answer is option D.