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Total Questions : 1709 | Page 6 of 171 pages
Question 51. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be
  1.    2 meters of water column
  2.    3 meters of water column
  3.    5 meters of water column
  4.    6 meters of water Column
 Discuss Question
Answer: Option D. -> 6 meters of water Column
Question 52. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
  1.    higher than the surface of liquid
  2.    the same as the surface of liquid
  3.    lower than the surface of liquid
  4.    unpredictable
 Discuss Question
Answer: Option C. -> lower than the surface of liquid
Question 53. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be
  1.    2 meters of water column
  2.    3 meters of water column
  3.    3.5 meters of water column
  4.    4 m of water column
 Discuss Question
Answer: Option B. -> 3 meters of water column
Question 54. During the opening of a valve in a pipe line, the flow is
  1.    steady
  2.    unsteady
  3.    uniform
  4.    laminar
 Discuss Question
Answer: Option B. -> unsteady
Question 55. 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
Question 56. A balloon lifting in air follows the following principle
  1.    law of gravitation
  2.    Archimedes principle
  3.    principle of buoyancy
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 57. In a forced vortex motion, the velocity of flow is
  1.    directly proportional to its radial distance from axis of rotation
  2.    inversely proportional to its radial distance from the axis of rotation
  3.    inversely proportional to the square of its radial distance from the axis of rotation
  4.    directly proportional to the square of its radial distance from the axis of rotation
 Discuss Question
Answer: Option A. -> directly proportional to its radial distance from axis of rotation
Question 58. Choose the wrong statement
  1.    The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface
  2.    The horizontal component acts through the center of pressure for the vertical projection
  3.    The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
  4.    he vertical component passes through the center of pressure of the volume
 Discuss Question
Answer: Option D. -> he vertical component passes through the center of pressure of the volume
Question 59. The atmospheric pressure with rise in altitude decreases
  1.    linearly
  2.    first slowly and then steeply
  3.    first steeply and then gradually
  4.    unpredictable
 Discuss Question
Answer: Option B. -> first slowly and then steeply
Question 60. When the flow parameters at any given instant remain same at every point, then flow is said to be
  1.    quasi static
  2.    steady state
  3.    laminar
  4.    uniform
 Discuss Question
Answer: Option D. -> uniform

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