401. The line of action of the buoyant force acts through the
Centroid of the displaced volume of fluid
Centre of gravity of a submerged body
Centroid of the volume of any floating body
None of these
✅ The correct answer is option A.
Fluid Mechanics MCQs
402. The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is
Q∝N : H∝N² : P∝N³
Q∝N² : H∝N³ : P∝N
Q∝N : H∝N³ : P∝N²
Q∝N³ : H∝N : P∝N²
✅ The correct answer is option A.
403. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation ? 1. Fluid flow is frictionless & irrotational. 2. Fluid flow is steady. 3. Fluid flow is uniform & turbulent. 4. Fluid is compressible. 5. Fluid is incompressible.
1, 3, 3
2, 3, 4
1, 2, 4
1, 3, 4
✅ The correct answer is option C.
404. The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.
Steady uniform
Steady non uniform
Unsteady uniform
Unsteady non uniform
✅ The correct answer is option B.
406. Priming is needed in a __________ pump.
Reciprocating
Gear
Centrifugal
Diaphragm
✅ The correct answer is option C.
407. Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)
D = 1840 H0.5/N
D = 1840 N/H0.5
H = 1840 D0.5/N
D = 1840 H/N
✅ The correct answer is option A.
408. Reynolds number is the ratio of
Viscous forces to gravity forces
Inertial forces to viscous forces
Viscous forces to inertial forces
Inertial forces to gravity forces
✅ The correct answer is option B.
409. Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.
Radius of
Speed of
Fluid velocity leaving
None of these
✅ The correct answer is option D.
410. Upto what value of ‘Mach number’, a fluid may be considered as incompressible?
0.03
0.3
3
10
✅ The correct answer is option B.