Hydraulics and Fluid Mechanics MCQ – Set 16

Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineeringnew exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.

Q1. Euler’s equation in the differential form for the motion of liquids is given by

(A) dp/ρ + g.dz + v.dv = 0
(B) dp/ρ – g.dz + v.dv = 0
(C) ρ.dp + g.dz + v.dv = 0
(D) ρ.dp – g.dz + v.dv = 0

Answer: (A) dp/ρ + g.dz + v.dv = 0

Q2. A nozzle placed at the end of a water pipe line discharges water at a

(A) Low pressure
(B) High pressure
(C) Low velocity
(D) High velocity

Answer: (D) High velocity

Q3. The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(A) (2/3) Cd × b × √(2gH)
(B) (2/3) Cd × b × √(2g) × H
(C) (2/3) Cd × b × √(2g) × H3/2
(D) (2/3) Cd × b × √(2g) × H2

Answer: (C) (2/3) Cd × b × √(2g) × H3/2

Q4. The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)

(A) v²/2g
(B) 0.5v²/2g
(C) 0.375v²/2g
(D) 0.75v²/2g

Answer: (B) 0.5v²/2g

Q5. In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

(A) 1/16 to 1/8
(B) 1/8 to 1/4
(C) 1/4 to 1/3
(D) 1/3 to 1/2

Answer:(D) 1/3 to 1/2

Q6. The most efficient section of a channel is

(A) Triangular
(B) Rectangular
(C) Square
(D) Trapezoidal

Answer: (D) Trapezoidal

Q7. A notch is used to measure __ of liquids.

(A) Pressure
(B) Discharge
(C) Velocity
(D) Volume

Answer:(B) Discharge

Q8. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

(A) Minimum
(B) Maximum
(C) Zero
(D) Could be any value

Answer: (D) Could be any value

Q9. A weir is said to be broad crested weir, if the width of the crest of the weir is __ half the height of water above the weir crest.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

Answer:(C) More than

Q10. Which of the following instrument can be used for measuring speed of an aeroplane?

(A) Venturimeter
(B) Orifice plate
(C) Pitot tube
(D) Rotameter

Answer: (C) Pitot tube

Q11. A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

(A) 14π R1/2/15Cd × a √(2g)
(B) 14π R3/2/15Cd × a √(2g)
(C) 14π R5/2/15Cd × a √(2g)
(D) 14π R7/2/15Cd × a √(2g)

Answer: (C) 14π R5/2/15Cd × a √(2g)

Q12. Which of the following is the unit of kinematic viscosity?

(A) Pascal
(B) Poise
(C) Stoke
(D) Faraday

Answer: (C) Stoke

Q13. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

(A) 3.53 kN
(B) 33.3 kN
(C) 35.3 kN
(D) None of these

Answer: (C) 35.3 kN

Q14. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

(A) One dimensional flow
(B) Uniform flow
(C) Steady flow
(D) Turbulent flow

Answer: (B) Uniform flow

Q15. Mercury does not wet glass. This is due to property of liquid known as

(A) Adhesion
(B) Cohesion
(C) Surface tension
(D) Viscosity

Answer: (C) Surface tension

Q16. The siphon will work satisfactorily, if the minimum pressure in the pipe is __ vapour pressure of liquid.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

Answer: (C) More than

Q17. The sheet of water flowing over a notch or a weir is known as

(A) Sill or crest
(B) Nappe or vein
(C) Orifice
(D) None of these

Answer: (B) Nappe or vein

Q18. An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

(A) tanθ = a/g
(B) tanθ = 2 a/g
(C) tanθ = a/2g
(D) tanθ = a2/2g

Answer: (A) tanθ = a/g

Q19. The pressure of fluid due to hammer blow is

(A) Directly proportional to density of fluid
(B) Inversely proportional to density of fluid
(C) Directly proportional to (density)1/2 of fluid
(D) Inversely proportional to (density)1/2 of fluid

Answer: (C) Directly proportional to (density)1/2 of fluid

Q20. A metal with specific gravity of ‘a’ floating in a fluid of same specific gravity ‘a’ will

(A) Sink to bottom
(B) Float over fluid
(C) Partly immersed
(D) Be fully immersed with top surface at fluid surface

Answer: (D) Be fully immersed with top surface at fluid surface

We hope the given Mechanical Engineering MCQ Questions with Answers will definitely yield fruitful results. Hope you got enough ideas on the MCQs on Mechanical Engineering. If you have any queries related to Mechanical Engineering MCQs Multiple Choice Questions with Answers, drop your questions below and will get back to you in no time.