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Total Questions : 1709 | Page 139 of 171 pages
Question 1381. 0. A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is running full. If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following :
  1.    hydraulic mean depth = 1.5 m
  2.    Velocity of flow = 1.5 m/sec
  3.    Rate of flow = 27 m3/sec
  4.    All the above.
 Discuss Question
Answer: Option D. -> All the above.
Question 1382. 8. The flow in open channel is said to be subcritical if the Froude number is
  1.    less than 1.0
  2.    equal to 1.0
  3.    greater than 1.0
  4.    none.
 Discuss Question
Answer: Option A. -> less than 1.0
Question 1383. 1.  For a most economical rectangular channel, the width of the channel must be
  1.    equal to depth of flow
  2.    twice the depth of flow
  3.    half the depth of flow
  4.    None of these.
 Discuss Question
Answer: Option B. -> twice the depth of flow
Question 1384. 2. For a most economical rectangular channel, the hydraulic mean depth, is equal to
  1.    the depth of flow
  2.    half the depth of flow
  3.    one-third depth of flow
  4.    None of these.
 Discuss Question
Answer: Option B. -> half the depth of flow
Question 1385. 3.  For a most economical trapezoidal open channel, the half of the top width must be equal to
  1.    the bed width
  2.    one sloping side
  3.    the depth of flow
  4.    None of these.
 Discuss Question
Answer: Option B. -> one sloping side
Question 1386. 5. The best side slope for most economical trapezoidal section, is
  1.    30?
  2.    45?
  3.    60?
  4.    None of these.
 Discuss Question
Answer: Option C. -> 60?
Question 1387. 7.  For critical depth of flow of water in open channels, the specific energy must be :
  1.    minimum
  2.    maximum
  3.    average of maximum and minimum
  4.    None of these.
 Discuss Question
Answer: Option A. -> minimum
Question 1388. 6.  Tick up the correct statement from the following :
  1.    For maximum velocity of flow, the depth of water in the circular channel must be 0.81 times the diameter of the channel
  2.    For maximum velocity, the hydraulic mean depth must be 0.3 times the diameter of circular channel
  3.    For maximum discharge the depth of flow must be 0.95 times the diameter of circular channel
  4.    All the above,
 Discuss Question
Answer: Option D. -> All the above,
Question 1389. 4.  For the most economical trapezoidal open channel,
  1.    half of the top width must be equal to one of the sloping sides
  2.    the hydraulic mean depth must be equal to half the depth of flow
  3.    the semicircle drawn with top width as diameter must touch the three sides of the channel
  4.    All of these.
 Discuss Question
Answer: Option D. -> All of these.
Question 1390. 8. For critical flow, the Froude number is :
  1.    1
  2.    less than 1.0
  3.    more than 1.0
  4.    2
 Discuss Question
Answer: Option A. -> 1

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