Fluid Mechanics MCQs Archives

521. In deriving Bernoulli’s equation, fluid is assumed to be

Incompressible, frictionless, steady, along a streamline

Uniform, steady, incompressible, along a streamline

Steady, density being pressure dependent, frictionless

None of these

✅ The correct answer is option A.

522. A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is __________ kg.

100

1000

10000

✅ The correct answer is option B.

523. Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively).

FL⁻²T, ML⁻¹T⁻¹

FLT, ML⁻¹T⁻¹

ML⁻¹T⁻³, F⁻¹L²T

F-1L²T⁻¹, MLT⁻³

✅ The correct answer is option A.

524. The head loss in turbulent flow in a pipe varies

Directly as the velocity

Inversely as the square of the velocity

Approximately as the square of the velocity

Inversely as the square of the diameter

✅ The correct answer is option C.

525. Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.

Single stage vertical

Centrifugal

Plunger

Diffuser

✅ The correct answer is option A.

526. Power required for mixing Newtonion fluids is a function of the

Speed of impeller, diameter of impeller & viscosity

Density & viscosity of fluid only

Density of fluid, viscosity of fluid & impeller dia only

None of these

✅ The correct answer is option D.

527. At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump?

40° and 140°

45° and 60°

90° and 80°

20° and 120°

✅ The correct answer is option A.

528. Design of the casing of centrifugal pump should be such as to minimise the

Back flow through impeller

Loss of kinetic head

Loss of static head

None of these

✅ The correct answer is option B.

529. Experimental study of laminar fluid flow through a circular tube was conducted by

Reynolds

Hagen and Poiseuille

Pascal

Blake-Plummer

✅ The correct answer is option B.

530. Unsteady non-uniform flow is represented by flow through a/an

Long pipe at constant rate

Long pipe at decreasing rate

Expanding tube at increasing rate

Expanding tube at constant rate

✅ The correct answer is option C.