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MCQs

Total Questions : 1709 | Page 146 of 171 pages
Question 1451. Two pipe systems are said to be equivalent when_________________?
  1.    head loss and discharge are same in two systems
  2.    length of pipe and discharge are same in two systems
  3.    friction factor and length are same in two systems
  4.    length and diameter are same in two systems
 Discuss Question
Answer: Option A. -> head loss and discharge are same in two systems
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1452. The losses are more in_________________?
  1.    laminar flow
  2.    transition flow
  3.    turbulent flow
  4.    critical flow
 Discuss Question
Answer: Option C. -> turbulent flow
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1453. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?
  1.    laminar flow
  2.    transition flow
  3.    turbulent flow
  4.    not predictable from the given data
 Discuss Question
Answer: Option A. -> laminar flow
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1454. With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on__________________?
  1.    a circular disc of plate held normal to flow
  2.    a sphere
  3.    a cylinder
  4.    a streamlined body
 Discuss Question
Answer: Option A. -> a circular disc of plate held normal to flow
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1455. The maximum thickness of boundary layer in a pipe of radius r is____________________?
  1.    0
  2.    r/2
  3.    r
  4.    2r
 Discuss Question
Answer: Option C. -> r
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1456. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?
  1.    0.223 R
  2.    0.423 R
  3.    0.577 R
  4.    0.707 R
 Discuss Question
Answer: Option A. -> 0.223 R
WHERE R IS RADIUS OF PIPE
Question 1457. For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?
  1.    directly proportional to Reynolds number and independent of pipe wall roughness
  2.    directly proportional to pipe wall roughness and independent of Reynolds number
  3.    inversely proportional to Reynolds number and indpendent of pipe wall roughness
  4.    inversely proportional to Reynolds number and directly proportional to pipe wall roughness
 Discuss Question
Answer: Option C. -> inversely proportional to Reynolds number and indpendent of pipe wall roughness
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1458. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?
  1.    constant
  2.    dependent only on Reynolds number
  3.    a function of Reynolds number and relative roughness
  4.    dependent on relative roughness only
 Discuss Question
Answer: Option B. -> dependent only on Reynolds number
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1459. The velocity distribution for laminar flow through a circular tube__________________?
  1.    is constant over the cross-section
  2.    varies linearly from zero at walls to maximum at centre
  3.    varies parabolically with maximum at the centre
  4.    none of the above
 Discuss Question
Answer: Option C. -> varies parabolically with maximum at the centre
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1460. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?
  1.    1/2
  2.    2/3
  3.    3/2
  4.    2
 Discuss Question
Answer: Option A. -> 1/2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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