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MCQs

Total Questions : 1709 | Page 144 of 171 pages
Question 1431. Separation of flow occurs when_________________?
  1.    the pressure intensity reaches a minimum
  2.    the cross-section of a channel is reduced
  3.    the boundary layer comes to rest
  4.    all of the above
 Discuss Question
Answer: Option C. -> the boundary layer comes to rest
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1432. When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wavE., the portion of pipe length subjected to maximum head is__________________?
  1.    L/4
  2.    L/3
  3.    L/2
  4.    L
 Discuss Question
Answer: Option A. -> L/4
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1433. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?
  1.    1 m
  2.    10m
  3.    100m
  4.    none of the above
 Discuss Question
Answer: Option C. -> 100m
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1434. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?
  1.    less than 1 m/sec
  2.    1 m/sec
  3.    1.5 m/sec
  4.    2 m/sec
 Discuss Question
Answer: Option B. -> 1 m/sec
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1435. The Prartdtl mixing length is_________________?
  1.    zero at the pipe wall
  2.    maximum at the pipe wall
  3.    independent of shear stress
  4.    none of the above
 Discuss Question
Answer: Option A. -> zero at the pipe wall
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1436. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?
  1.    1/3 R
  2.    1/2 R
  3.    2/3 R
  4.    3/4R
 Discuss Question
Answer: Option A. -> 1/3 R
WHERE R IS THE RADIUS OF PIPE
Question 1437. The wake_______________?
  1.    always occurs before a separation point
  2.    always occurs after a separation point
  3.    is a region of high pressure intensity
  4.    none of the above
 Discuss Question
Answer: Option B. -> always occurs after a separation point
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1438. The hydraulic grade line is_________________?
  1.    always above the centre line of pipe
  2.    never above the energy grade line
  3.    always sloping downward in the direction of flow
  4.    all of the above
 Discuss Question
Answer: Option B. -> never above the energy grade line
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1439. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?
  1.    less than 1
  2.    between 1 and 100
  3.    160
  4.    200
 Discuss Question
Answer: Option C. -> 160
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1440. In series-pipe problems_______________?
  1.    the head loss is same through each pipe
  2.    the discharge is same through each pipe
  3.    a trial solution is not necessary
  4.    the discharge through each pipe is added to obtain total discharge
 Discuss Question
Answer: Option B. -> the discharge is same through each pipe
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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