Hydraulics And Fluid Mechanics In ME MCQ

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• When a body is placed over a liquid, it will sink down if
  ক

  Gravitational force is equal to the up-thrust of the liquid

  খ

  Gravitational force is less than the up-thrust of the liquid

  গ

  Gravitational force is more than the up-thrust of the liquid

  ঘ

  None of the above
• The pressure at a point in a fluid will not be same in all the directions when the fluid is
  ক

  Moving

  খ

  Viscous

  গ

  Viscous and static

  ঘ

  Viscous and moving
• The number of buckets on the periphery of a Pelton wheel is given by
  ক

  $$\frac{{\text{D}}}{{2{\text{d}}}} + 5$$

  খ

  $$\frac{{\text{D}}}{{2{\text{d}}}} + 10$$

  গ

  $$\frac{{\text{D}}}{{2{\text{d}}}} + 15$$

  ঘ

  $$\frac{{\text{D}}}{{2{\text{d}}}} + 20$$
• According to fan laws, for the fans having constant wheel diameters, the power demand varies
  ক

  Directly as fan speed

  খ

  Square of fan speed

  গ

  Cube of fan speed

  ঘ

  Square root of fan speed
• In a centrifugal pump casing, the flow of water leaving the
  ক

  Radial

  খ

  Axial

  গ

  Centrifugal

  ঘ

  Vortex
• A pressure of 25 m of head of water is equal to
  ক

  25 kN/m²

  খ

  245 kN/m²

  গ

  2500 kN/m²

  ঘ

  2.5 kN/m²
• Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?
  ক

  Venturimeter

  খ

  Orifice plate

  গ

  Hot wire anemometer

  ঘ

  Pitot tube
• In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
  ক

  Equal to

  খ

  One-fourth

  গ

  One-third

  ঘ

  One-half
• The units of dynamic or absolute viscosity are
  ক

  Metres² per sec

  খ

  Kg-sec per meter

  গ

  Newton-sec per meter

  ঘ

  Newton-sec² per meter
• Hydrometer is used to determine
  ক

  Specific gravity of liquids

  খ

  Specific gravity of solids

  গ

  Specific gravity of gases

  ঘ

  Relative humidity
• Unit of surface tension is
  ক

  Energy/unit area

  খ

  Velocity/unit area

  গ

  Both of the above

  ঘ

  It has no units
• The unit of surface tension is
  ক

  N/m

  খ

  N/m²

  গ

  N/m³

  ঘ

  N-m
• The variation in the volume of a liquid with the variation of pressure is called its
  ক

  Surface tension

  খ

  Compressibility

  গ

  Capillarity

  ঘ

  Viscosity
• One liter of water occupies a volume of
  ক

  100 cm³

  খ

  250 cm³

  গ

  500 cm³

  ঘ

  1000 cm³
• A flow is called super-sonic if the
  ক

  Velocity of flow is very high

  খ

  Discharge is difficult to measure

  গ

  Mach number is between 1 and 6

  ঘ

  None of these
• The specific weight of water in S.I. units is taken as
  ক

  9.81 kN/m³

  খ

  9.81 × 10³ kN/m³

  গ

  9.81 × 10^-6 N/mm³

  ঘ

  Any one of these
• Specific weight of water in S.I. units is equal to
  ক

  1000 N/m³

  খ

  10000 N/m³

  গ

  9.81 × 10³ N/m³

  ঘ

  9.81 × 10⁶ N/m³
• High specific speed of a pump implies it is
  ক

  Centrifugal pump

  খ

  Mixed flow pump

  গ

  Axial flow pump

  ঘ

  Any one of the above
• Medium specific speed of a pump implies it is
  ক

  Centrifugal pump

  খ

  Mixed flow pump

  গ

  Axial flow pump

  ঘ

  Any one of the above
• Low specific speed of a pump implies it is
  ক

  Centrifugal pump

  খ

  Mixed flow pump

  গ

  Axial flow pump

  ঘ

  None of the above
• For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
  ক

  Ratio of inertial force to force due to viscosity

  খ

  Ratio of inertial force to force due to gravitation

  গ

  Ratio of inertial force to force due to surface tension

  ঘ

  All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
• When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.
  ক

  Less than

  খ

  More than

  গ

  Equal to

  ঘ

  None of these
• According to fan laws, at constant pressure, the speed capacity and power vary
  ক

  Directly as the air or gas density

  খ

  Inversely as square root of density

  গ

  Inversely as density

  ঘ

  As square of density
• The shear stress between the two liquid layers is __________ proportional to the distance between two layers.
  ক

  Directly

  খ

  Inversely

  গ

  Both A and B

  ঘ

  None of these
• The speed of a turbine runner is
  ক

  Directly proportional to $${{\text{H}}^{\frac{1}{2}}}$$

  খ

  Inversely proportional to $${{\text{H}}^{\frac{1}{2}}}$$

  গ

  Directly proportional to $${{\text{H}}^{\frac{3}{2}}}$$

  ঘ

  Inversely proportional to $${{\text{H}}^{\frac{3}{2}}}$$
• The unit speed of the turbine runner is
  ক

  $$\frac{{\text{N}}}{{\sqrt {\text{H}} }}$$

  খ

  $$\frac{{\text{N}}}{{\text{H}}}$$

  গ

  $$\frac{{\text{N}}}{{{{\text{H}}^{\frac{3}{2}}}}}$$

  ঘ

  $$\frac{{\text{N}}}{{{{\text{H}}^2}}}$$
• Centrifugal pump is started with its delivery valve
  ক

  Kept fully closed

  খ

  Kept fully open

  গ

  Irrespective of any position

  ঘ

  Kept 50% open
• Axial flow pump is started with its delivery valve
  ক

  Kept fully closed

  খ

  Kept fully open

  গ

  Irrespective of any position

  ঘ

  Kept 50% open
• The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
  ক

  Plus

  খ

  Minus

  গ

  Divide

  ঘ

  None of these
• The property of a fluid which enables it to resist tensile stress is known as
  ক

  Compressibility

  খ

  Surface tension

  গ

  Cohesion

  ঘ

  Adhesion