Fluid Mechanics

191.Foot valves provided in pumps are _________ valves.

  1. Relief
  2. Three/four way
  3. Pressure reducing
  4. Directional control
Correct answer: (D)
Directional control

192.For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the

  1. Square of the radial distance
  2. Radial distance linearly
  3. Inverse of the radial distance
  4. Elevation along vertical direction
Correct answer: (A)
Square of the radial distance

193.For a given fluid flow rate, which of the following incurs maximum head loss?

  1. Orificemeter
  2. Venturimeter
  3. Flow nozzle
  4. All of them incur the same head loss
Correct answer: (A)
Orificemeter

194.For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).

  1. Increase
  2. Decrease
  3. Remain constant
  4. Either (A) or (B); depends on other factors
Correct answer: (A)
Increase

195.For a given Reynolds number, in a hydraulically smooth pipe, further smoothening _________ the friction factor.

  1. Brings about no further reduction of
  2. Increases
  3. Decreases
  4. None of these
Correct answer: (A)
Brings about no further reduction of

196.For a particle settling in water at its terminal settling velocity, which of the following is true?

  1. Buoyancy = weight + drag
  2. Weight = buoyancy + drag
  3. Drag = buoyancy + weight
  4. Drag = weight
Correct answer: (B)
Weight = buoyancy + drag

197.For a reciprocating pump, the indicator diagram is the graph between the

  1. Discharge and overall efficiency
  2. Volume swept by piston for one complete revolution and the pressure in the cylinder
  3. Angle swept by the crank pin at any instant and the discharge
  4. None of these
Correct answer: (B)
Volume swept by piston for one complete revolution and the pressure in the cylinder

198.For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

  1. Directly as square of gas density
  2. Directly as gas density
  3. Directly as square root of gas density
  4. Inversely as gas density
Correct answer: (B)
Directly as gas density

199.For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).

  1. G is above B
  2. B is above G
  3. B & G coincide
  4. None of these
Correct answer: (B)
B is above G

200.For an ideal fluid flow, Reynolds number is

  1. 2100
  2. 100
  3. 0
  4. ∞
Correct answer: (D)
∞
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