Hydraulics and Fluid Mechanics – Section 2

41. The shear stress-strain graph for a Newtonian fluid is a

A. straight line
B. parabolic curve
C. hyperbolic curve
D. elliptical

Correct Answer: A. straight line

42. If a pitot tube is placed with its nose upstream, downstream or sideways, the reading will be the same in every case.

A. True
B. False

Correct Answer: B. False

43. A flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other is called turbulent flow.

A. Agree
B. Disagree

Correct Answer: A. Agree

44. A flow in which the viscosity of the fluid is dominating over the inertia force is called

A. steady flow
B. unsteady flow
C. laminar flow
D. turbulent flow

Correct Answer: C. laminar flow

45. An air vessel is provided at the summit in a syphon to

A. avoid interruption in the flow
B. increase discharge
C. increase velocity
D. maintain pressure difference

Correct Answer: A. avoid interruption in the flow

46. If a body floating in a liquid does not return back to its original position, and heels farther “away when given a small angular displacement, the body is said to be in neutral equilibrium.

A. Yes
B. No

Correct Answer: B. No

47. The length of the divergent cone in a venturimeter is __________ that of the convergent cone.

A. equal to
B. double
C. three to four times
D. five to six times

Correct Answer: C. three to four times

48. A flow through a long pipe at constant rate is called

A. steady uniform flow
B. steady non-uniform flow
C. unsteady uniform flow
D. unsteady non-uniform flow

Correct Answer: A. steady uniform flow

49. The volume per unit mass of a liquid is called specific volume.

A. Yes
B. No

Correct Answer: A. Yes

50. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water.

A. Correct
B. Incorrect

Correct Answer: A. Correct

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