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MCQs

Total Questions : 3218 | Page 37 of 322 pages
Question 361. In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.
  1.    More than
  2.    Less than
  3.    Equal to
  4.    Either A or B
 Discuss Question
Answer: Option A. -> More than
Question 362. Stoke's law is valid, when the particle Reynolds number is
  1.    < 1
  2.    > 1
  3.    < 5
  4.    None of these
 Discuss Question
Answer: Option A. -> < 1
Question 363. Which of the following has the maximum compression ratio?
  1.    Blower
  2.    Compressor
  3.    Vacuum pump
  4.    Fan
 Discuss Question
Answer: Option C. -> Vacuum pump
Question 364. In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
  1.    Inverse
  2.    Square root
  3.    Second power
  4.    First power
 Discuss Question
Answer: Option B. -> Square root
Question 365. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the
  1.    Drag on particles
  2.    Drag on coloumn walls
  3.    Bed height
  4.    Bed voidage
 Discuss Question
Answer: Option C. -> Bed height
Question 366. Foot valve provided in the pump is a __________ valve.
  1.    Direction control
  2.    Back pressure
  3.    Relief
  4.    Pressure reduction
 Discuss Question
Answer: Option B. -> Back pressure
Question 367. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is
  1.    5
  2.    14.1
  3.    56.22
  4.    28.2
 Discuss Question
Answer: Option D. -> 28.2
Question 368. For flow through an orifice from a reservoir, the actual velocity at the vena con-tracta is given by
  1.    √(2gh)
  2.    C.V. √(2gh)
  3.    Cd √(2gh)
  4.    Cc √(2gh)
 Discuss Question
Answer: Option B. -> C.V. √(2gh)
Question 369. In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is
  1.    0.5
  2.    0.84
  3.    1.84
  4.    1.25
 Discuss Question
Answer: Option C. -> 1.84
Question 370. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)
  1.    N²D³
  2.    ND²
  3.    N²D
  4.    N³D⁵
 Discuss Question
Answer: Option D. -> N³D⁵

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