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MCQs

Total Questions : 304 | Page 1 of 31 pages
Question 1. The working of which of the following hydraulic units is based on Pascal's law?
  1.    Air lift pump
  2.    Jet pump
  3.    Hydraulic coupling
  4.    Hydraulic press
 Discuss Question
Answer: Option D. -> Hydraulic press
Answer: (d).Hydraulic press
Question 2. The hydraulic efficiency of a reaction turbine, is the ratio of
  1.    power produced by the turbine to the energy actually supplied by the turbine
  2.    actual work available at the turbine to energy imparted to the wheel
  3.    workdone on the wheel to the energy (or head of water) actually supplied to the turbine
  4.    none of the above
 Discuss Question
Answer: Option C. -> workdone on the wheel to the energy (or head of water) actually supplied to the turbine
Answer: (c).workdone on the wheel to the energy (or head of water) actually supplied to the turbine
Question 3. A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.
  1.    Correct
  2.    Incorrect
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Correct
Answer: (a).Correct
Question 4. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
  1.    39.2%
  2.    48.8%
  3.    84.8%
  4.    88.4%
 Discuss Question
Answer: Option A. -> 39.2%
Answer: (a).39.2%
Question 5. 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
Answer: (a).the suction pressure should be high
Question 6. The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)
  1.    (1 + cos φ)/2
  2.    (1 - cos φ)/2
  3.    (1 + sin φ)/2
  4.    (1 - sin φ)/2
 Discuss Question
Answer: Option A. -> (1 + cos φ)/2
Answer: (a).(1 + cos φ)/2
Question 7. In a centrifugal pump, the water enters the impeller __________ and leaves the vanes axially.
  1.    axially
  2.    radially
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option B. -> radially
Answer: (b).radially
Question 8. In a Francis turbine runner, the number of blades are generally between
  1.    2 to 4
  2.    4 to 8
  3.    8 to 16
  4.    16 to 24
 Discuss Question
Answer: Option D. -> 16 to 24
Answer: (d).16 to 24
Question 9. The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) ) is
  1.    ηh = ηo x ηm
  2.    ηm = ηo x ηh
  3.    ηo = ηh x ηm
  4.    none of these
 Discuss Question
Answer: Option C. -> ηo = ηh x ηm
Answer: (c).ηo = ηh x ηm
Question 10. A Kaplan turbine is an axial flow reaction turbine.
  1.    Correct
  2.    Incorrect
  3.    Can't say
  4.    None of these
 Discuss Question
Answer: Option A. -> Correct
Answer: (a).Correct

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