Lakshya Education MCQs

Question: The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
Options:
A. Delivers unit discharge under unit head
B. Delivers unit discharge under unit speed
C. Develops unit power under unit head
D. Develops unit power under unit speed
Answer: Option C

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Question 1. Which of the following statement is correct?
  1.     In an impulse turbine, the water impinges on the buckets with pressure energy.
  2.     In a reaction turbine, the water glides over the moving vanes with kinetic energy.
  3.     In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
  4.     In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.
Answer: Option C
Question 2. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
  1.     Delivers unit discharge under unit head
  2.     Delivers unit discharge under unit speed
  3.     Develops unit power under unit head
  4.     Develops unit power under unit speed
Answer: Option C
Question 3. The length ab of a pipe abc in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at b which is constant for the length bc. the loss of head due to sudden enlargement is
  1.     (v₁ - v₂)²/g
  2.     (v₁² - v₂²)/g
  3.     (v₁ - v₂)²/2g
  4.     (v₁² - v₂²)/2g
Answer: Option C
Question 4. Which of the following statement is correct?
  1.     The centrifugal pump is suitable for large discharge and smaller heads
  2.     The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump
  3.     The efficiency of centrifugal pump is less as compared to reciprocating pump
  4.     All of the above
Answer: Option D
Question 5. Which of the following statement is correct?
  1.     In an impulse turbine, the water impinges on the buckets with pressure energy.
  2.     In a reaction turbine, the water glides over the moving vanes with kinetic energy.
  3.     In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
  4.     In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.
Answer: Option C
Question 6. In centrifugal pumps, maximum efficiency is obtained when the blades are
  1.     Straight
  2.     Bent forward
  3.     Bent backward
  4.     Radial
Answer: Option C

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