Hydraulic and Fluid Mechanics

221. Resultant pressure of the liquid in the case of an immersed body acts through

  1. Centre of gravity
  2. Centre of pressure
  3. Metacentre
  4. Centre of buoyancy

Correct answer: (B)
Centre of pressure

222. Reynolds number is significant in

  1. Supersonics, as with projectile and jet propulsion
  2. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
  3. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
  4. All of the above

Correct answer: (B)
Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

223. Reynold's number is the ratio of inertia force to

  1. Pressure force
  2. Elastic force
  3. Gravity force
  4. Viscous force

Correct answer: (D)
Viscous force

224. Reynold's number is the ratio of the inertia force to the

  1. Surface tension force
  2. Viscous force
  3. Gravity force
  4. Elastic force

Correct answer: (B)
Viscous force

225. Rotameter is a device used to measure

  1. Absolute pressure
  2. Velocity of fluid
  3. Flow
  4. Rotation

Correct answer: (C)
Flow

226. Select the correct statement

  1. Weber's number is the ratio of inertia force to elastic force.
  2. Weber's number is the ratio of gravity force to surface tension force.
  3. Weber's number is the ratio of viscous force to pressure force.
  4. Weber's number is the ratio of inertia force to surface tension force.

Correct answer: (D)
Weber's number is the ratio of inertia force to surface tension force.

227. Select the wrong statement

  1. An equivalent pipe is treated as an ordinary pipe for all calculations
  2. The length of an equivalent pipe is equal to that of a compound pipe
  3. The discharge through an equivalent pipe is equal to that of a compound pipe
  4. The diameter of an equivalent pipe is equal to that of a compound pipe

Correct answer: (D)
The diameter of an equivalent pipe is equal to that of a compound pipe

228. Specific weight of sea water is more that of pure water because it contains

  1. Dissolved air
  2. Dissolved salt
  3. Suspended matter
  4. All of the above

Correct answer: (D)
All of the above

229. Specific weight of water in S.I. units is equal to

  1. 1000 N/m3
  2. 10000 N/m3
  3. 9.81 × 103 N/m3
  4. 9.81x106M/m3

Correct answer: (C)
9.81 × 103 N/m3

230. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will

  1. Decrease
  2. Increase
  3. Remain unchanged
  4. Depend upon the characteristics of liquid

Correct answer: (B)
Increase

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