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**Home⇒ Engineering⇒ Fluid mechanics hydraulic engineering**

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Q1 ⇒ The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is1/3[other wrong options] [Discuss in forum] 1/4 1/2 2/3 |

Q2 ⇒ The correct relationship among displacement thickness d, momentum thickness m and energy thickness e ise > d > m[other wrong options] [Discuss in forum] d > m > e d > e > m e > m > d |

Q3 ⇒ For laminar flow in circular pipes, the Darcy's friction factor f is equal to64/ Re[other wrong options] [Discuss in forum] 16/Re 32/ Re none of the above where R,, is Reynolds number. |

Q4 ⇒ The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is.always below the centroid of the area[other wrong options] [Discuss in forum] at the centroid of the submerged area always above the centroid of the area none of the above |

Q5 ⇒ Two pieces of metal when immersed in a
liquid have equal upthrust on them, thenBoth pieces must have equal volumes[other wrong options] [Discuss in forum] Both pieces must have equal weig.hts Both pieces must have equal densities Both are floating to the same depth |

Q6 ⇒ The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as.center of pressure[other wrong options] [Discuss in forum] center of gravity center of buoyancy metacentre |

Q7 ⇒ A wooden cylinder floats vertically in water
with half of its length immersed. The density
of wood isHalf the density of water[other wrong options] [Discuss in forum] Equal to that of water Double the density of water The question is incomplete |

Q8 ⇒ The horizontal component of force on a curved surface is equal to the.force on a vertical projection of the curved surface[other wrong options] [Discuss in forum] product of pressure intensity at its centroid and area weight of liquid vertically above the curved surface force on the horizontal projection of the curved surface |

Q9 ⇒ If in a satellite orbiting the earth, a cork is
immersed in a jar of water and released, it
willRemain where left[other wrong options] [Discuss in forum] Rise Sink None of the above |

Q10 ⇒ Stream lines and path lines always coincide in case of.steady flow[other wrong options] [Discuss in forum] steady flow uniform flow turbulent flow |

Q11 ⇒ As ideal fluid isFrictionless and incompressible[other wrong options] [Discuss in forum] One which obeys Newton's law of
viscosity One which satisfies continuity equation One which flows through pipes with least friction |

Q12 ⇒ Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by.5%[other wrong options] [Discuss in forum] 10% 15% 20% |

Q13 ⇒ The relationship dp/dx = dz/dy
is valid forIrrotational flow[other wrong options] [Discuss in forum] Non-uniform flow Uniform flow Unsteady flow |

Q14 ⇒ Coefficient of contraction for an external cylindrical mouthpiece is.1.00[other wrong options] [Discuss in forum] 0.855 0.7H 0.611 |

Q15 ⇒ The ratio between inertia force and viscous
force is calledReynold's number[other wrong options] [Discuss in forum] Froude's number Weber's number Euler's number |

Q16 ⇒ When a bubble rises from the bottom of a
lake to the surface, its radius doubles. The
atmospheric pressure is equal to that of a
column of water of height H. The depth of the
lake is7H[other wrong options] [Discuss in forum] H 2H 8H |

Q17 ⇒ The depth 'd' below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be0.577 D[other wrong options] [Discuss in forum] 0.423 D 0.223 D 0.707 D |

Q18 ⇒ When the flow in open channel is gradually
varied, the flow is said to beSteady non-uniform flow[other wrong options] [Discuss in forum] Steady uniform flow Unsteady uniform flow Unsteady non-uniform flow |

Q19 ⇒ When a ship floats on waterThe weight of water displaced is equal to
the weight of the ship[other wrong options] [Discuss in forum] It displaces no water The weight of water displaced is lesser than the weight of the ship The weight of water displaced is greater than the weight of the ship |

Q20 ⇒ The value of friction factor 'f' for smooth pipes for Reynolds number 106 is approximately equal to.0.01[other wrong options] [Discuss in forum] 0.1 0.001 0.0001 |

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