Mechanical Engineering Hydraulics Test Exam - Set 31 - ObjectiveBooks

# Practice Test: Question Set - 31

1. According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
(A) Equal to
(B) Directly proportional
(C) Inversely proportional
(D) None of these

2. A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is
(A) 4.5 kN/m3
(B) 6 kN/m3
(C) 7.5 kN/m3
(D) 10 kN/m3

3. 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

4. The increase of temperature results in
(A) Increase in viscosity of gas
(B) Increase in viscosity of liquid
(C) Decrease in viscosity of gas
(D) Decrease in viscosity of liquid

5. Which of the following is an example of laminar flow?
(A) Underground flow
(B) Flow past tiny bodies
(C) Flow of oil in measuring instruments
(D) All of these

6. Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
(A) Internal
(B) External
(C) Both A and B
(D) None of these

7. The product of mass and acceleration of flowing liquid is called
(A) Inertia force
(B) Viscous force
(C) Gravity force
(D) Pressure force

8. The top of the weir over which the water flows is known as
(A) Sill or crest
(B) Nappe or vein
(C) Orifice
(D) None of these

9. The meatcentric height is the distance between the
(A) Centre of gravity of the floating body and the centre of buoyancy
(B) Centre of gravity of the floating body and the metacentre
(C) Metacentre and centre of buoyancy
(D) Original centre of buoyancy and new centre of buoyancy

10. The time oscillation of a floating body with increase in meatcentric height will be
(A) Same
(B) Higher
(C) Lower
(D) Lower/higher depending on weight of body

11. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
(A) Surface tension
(B) Compressibility
(C) Capillarity
(D) Viscosity

12. An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.
(A) Free
(B) Partially
(C) Full
(D) None of these

13. A manometer is used to measure
(A) Low pressure
(B) Moderate pressure
(C) High pressure
(D) Atmospheric pressure

14. Which of the following meters is not associated with viscosity?
(A) Red wood
(B) Say bolt
(C) Engler
(D) Orsat

15. The specific weight of water in S.I. units is taken as
(A) 9.81 kN/m3
(B) 9.81 × 103 N/m3
(C) 9.81 × 10-6 N/mm3
(D) Any one of these

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