Hydraulics And Fluid Mechanics In ME MCQ

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• The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle $$\theta $$ with the jet is
  ক

  $$\frac{{{\text{waV}}}}{{2{\text{g}}}} \times \sin \theta $$

  খ

  $$\frac{{{\text{waV}}}}{{\text{g}}} \times \sin \theta $$

  গ

  $$\frac{{{\text{wa}}{{\text{V}}^2}}}{{2{\text{g}}}} \times \sin 2\theta $$

  ঘ

  $$\frac{{{\text{wa}}{{\text{V}}^2}}}{{\text{g}}} \times \sin 2\theta $$
• Maximum impulse will be developed in hydraulic ram when
  ক

  Waste valve closes suddenly

  খ

  Supply pipe is long

  গ

  Supply pipe is short

  ঘ

  Ram chamber is large
• For starting an axial flow pump, its delivery valve should be
  ক

  Closed

  খ

  Open

  গ

  Depends on starting condition and flow desired

  ঘ

  Could be either open or closed
• Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m³, Q = Discharge of the pump in m³/s, H_s = Suction head in meters and H_d = Delivery head in meters)
  ক

  wQH_s

  খ

  wQH_d

  গ

  wQ (H_s - H_d)

  ঘ

  wQ (H_s + H_d)
• The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
  ক

  0.0116 stoke

  খ

  0.116 stoke

  গ

  0.0611 stoke

  ঘ

  0.611 stoke
• 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
• The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at ($$\omega $$) rad/s about its vertical axis, is
  ক

  $$\frac{{\pi {\text{w}}{\omega ^2}{{\text{r}}^2}}}{{4{\text{g}}}}$$

  খ

  $$\frac{{\pi {\text{w}}{\omega ^2}{{\text{r}}^3}}}{{4{\text{g}}}}$$

  গ

  $$\frac{{\pi {\text{w}}{\omega ^2}{{\text{r}}^4}}}{{4{\text{g}}}}$$

  ঘ

  $$\frac{{\pi {\text{w}}{\omega ^2}{{\text{r}}^2}}}{{2{\text{g}}}}$$
• 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
• A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to
  ক

  10 kg

  খ

  100 kg

  গ

  1000 kg

  ঘ

  1 kg
• 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
• The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m³, a = Cross-sectional area of jet in m² and V = Velocity of jet in m/s)
  ক

  $$\frac{{{\text{waV}}}}{{2{\text{g}}}}$$

  খ

  $$\frac{{{\text{waV}}}}{{\text{g}}}$$

  গ

  $$\frac{{{\text{wa}}{{\text{V}}^2}}}{{2{\text{g}}}}$$

  ঘ

  $$\frac{{{\text{wa}}{{\text{V}}^2}}}{{\text{g}}}$$