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MCQs

Total Questions : 3147 | Page 33 of 315 pages
Question 321. In order to avoid cavitation in centrifugal pumps
  1.    The suction pressure should be high
  2.    The delivery pressure should be high
  3.    The suction pressure should be low
  4.    The delivery pressure should be low
 Discuss Question
Answer: Option A. -> The suction pressure should be high
Question 322. The Francis formula for the discharge over Cipoletti weir is
  1.    1.84 LH1/2
  2.    1.84 LH
  3.    1.84 LH3/2
  4.    1.84 LH5/2
 Discuss Question
Answer: Option C. -> 1.84 LH3/2
Question 323. The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
  1.    0.34 times
  2.    0.67 times
  3.    0.81 times
  4.    0.95 times
 Discuss Question
Answer: Option C. -> 0.81 times
Question 324. The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
  1.    0.34 times
  2.    0.67 times
  3.    0.81 times
  4.    0.95 times
 Discuss Question
Answer: Option D. -> 0.95 times
Question 325. The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)
  1.    (2/3) Cd × L.√2g [H1 - Ha]
  2.    (2/3) Cd × L. √2g [H13/2 - Ha3/2]
  3.    (2/3) Cd × L.√2g [H12 - Ha2]
  4.    (2/3) Cd × L. √2g [H15/2 - Ha5/2]
 Discuss Question
Answer: Option B. -> (2/3) Cd × L. √2g [H13/2 - Ha3/2]
Question 326. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is
  1.    400 kg/cm²
  2.    4000 kg/cm²
  3.    40 × 10⁵ kg/cm²
  4.    40 × 10⁶ kg/cm²
 Discuss Question
Answer: Option B. -> 4000 kg/cm²
Question 327. The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream
  1.    Keeps on increasing
  2.    Keeps on decreasing
  3.    Remain constant
  4.    May increase/decrease
 Discuss Question
Answer: Option C. -> Remain constant
Question 328. 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
 Discuss Question
Answer: Option D. -> Weber's number is the ratio of inertia force to surface tension force
Question 329. Select the correct statement
  1.    Local atmospheric pressure depends upon elevation of locality only
  2.    Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
  3.    Local atmospheric pressure is always below standard atmospheric pressure
  4.    A barometer reads the difference between local and standard atmospheric pressure
 Discuss Question
Answer: Option B. -> Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
Question 330. The discharge in an open channel corresponding to critical depth is
  1.    Zero
  2.    Minimum
  3.    Maximum
  4.    None of these
 Discuss Question
Answer: Option C. -> Maximum

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