Previous Years’ Fluid Mechanics Objective Questions

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16. Which one of the following pumps is not a positive displacement pump?

A. Lobe Pump

B. Centrifugal Pump

C. Reciprocating Pump

D. Vane Pump

Click for Answer/Explanation

Correct Answer is B

17. The velocity of the water stream is being measured by an L-shaped Pitot tube and the reading is 20 cm. Then what is the approximate value of velocity?

A. 2 m/s

B. 20 m/s

C. 9.8 m/s

D. 19.6 m/s

Click for Answer/Explanation

Correct Answer is A

V²/2g = 0.2

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18. In a hydraulic coupling, what is the ratio of the speed of the turbine runner to that of the pump impeller to maintain the circulatory motion of oil?

A. < 1

B. > 1

C. = 1

D. can be any value

Click for Answer/Explanation

Correct Answer is A

19. The power consumed per unit length in a laminar flow for the same discharge varies directly as Dn where D is the diameter of the pipe. Find the value of ‘n’?

A. -1/2

B. 1/2

C. -2

D. -4

Click for Answer/Explanation

Correct Answer is D

20. A body weighs 30 N and 15 N when weighed under submerged conditions in liquids of relative densities 0.8 and 1.2 respectively. Find the volume of the body in liters?

A. 3.82 L

B. 12.5 L

C. 18.7 L

D. 75.5 L

Click for Answer/Explanation

Correct Answer is A

W – (ρ2 × g) = 30 —–(1)

W – (ρ2 × g) = 15 —–(2)

Take ratios of (1) & (2), and solve

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