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MCQs

Total Questions : 3147 | Page 30 of 315 pages
Question 291. For centrifugal pump impeller, the maximum value of the vane exit angle is
  1.    10° to 15°
  2.    15° to 20°
  3.    20° to 25°
  4.    25° to 30°
 Discuss Question
Answer: Option C. -> 20° to 25°
Question 292. Choose the wrong statement. Alcohol is used in manometer, because
  1.    Its vapour pressure is low
  2.    It provides suitable meniscus for the inclined tube
  3.    Its density is less
  4.    It provides longer length for a given pressure difference
 Discuss Question
Answer: Option A. -> Its vapour pressure is low
Question 293. Alcohol is used in manometers because
  1.    It has low vapour pressure
  2.    It is clearly visible
  3.    It has low surface tension
  4.    It can provide longer column due to low density
 Discuss Question
Answer: Option D. -> It can provide longer column due to low density
Question 294. Two pipe systems can be said to be equivalent, when the following quantities are same
  1.    Friction loss and flow
  2.    Length and diameter
  3.    Flow and length
  4.    Friction factor and diameter
 Discuss Question
Answer: Option A. -> Friction loss and flow
Question 295. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
  1.    Minimum
  2.    Maximum
  3.    Zero
  4.    Could be any value
 Discuss Question
Answer: Option D. -> Could be any value
Question 296. If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
  1.    Geometric similarity
  2.    Kinematic similarity
  3.    Dynamic similarity
  4.    None of these
 Discuss Question
Answer: Option C. -> Dynamic similarity
Question 297. The discharge through a reaction turbine with increase in unit speed
  1.    Increases
  2.    Decreases
  3.    Remain unaffected
  4.    First increases and then decreases
 Discuss Question
Answer: Option B. -> Decreases
Question 298. The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is
  1.    24.8 r.p.m.
  2.    48.2 r.p.m
  3.    82.4 r.p.m.
  4.    248 r.p.m
 Discuss Question
Answer: Option C. -> 82.4 r.p.m.
Question 299. The specific weight of sea water is __________ that of pure water.
  1.    Same as
  2.    Less than
  3.    More than
  4.    None of these
 Discuss Question
Answer: Option C. -> More than
Question 300. When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called
  1.    Pascal’s law
  2.    Archimedes’s principle
  3.    Principle of flotation
  4.    Bernoulli’s theorem
 Discuss Question
Answer: Option B. -> Archimedes’s principle

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