Hydraulic Machines MCQs with answers Page - 11

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A

Admin • 802.91K Points
Coach

Q. In a reaction turbine, the draft tube is used

  • (A) to run the turbine full
  • (B) to prevent air to enter the turbine
  • (C) to increase the head of water by an amount equal to the height of the runner outlet above the tail race
  • (D) to transport water to downstream

A

Admin • 802.91K Points
Coach

Q. For centrifugal pump impeller, the maximum value of the vane exit angle is

  • (A) 10? to 15?
  • (B) 15? to 20?
  • (C) 20? to 25?
  • (D) 25? to 30?

A

Admin • 802.91K Points
Coach

Q. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

  • (A) Agree
  • (B) Disagree
  • (C) ---
  • (D) ---

A

Admin • 802.91K Points
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Q. Which of the following is not an impulse turbine?

  • (A) Girad turbine
  • (B) Turgo turbine
  • (C) Pelton wheel
  • (D) Kaplan turbine

A

Admin • 802.91K Points
Coach

Q. In an axial flow reaction turbine, the water flows

  • (A) parallel
  • (B) perpendicular
  • (C) ---
  • (D) ---

A

Admin • 802.91K Points
Coach

Q. The depth of the bucket for a Pelton wheel is generally

  • (A) equal to
  • (B) 1.2 times
  • (C) 1.8 times
  • (D) double

A

Admin • 802.91K Points
Coach

Q. The width of the bucket for a Pelton wheel is generally

  • (A) double
  • (B) three times
  • (C) four times
  • (D) five times

A

Admin • 802.91K Points
Coach

Q. The speed of a turbine runner is

  • (A) directly proportional to H1/2
  • (B) inversely proportional to H1/2
  • (C) directly proportional to H3/2
  • (D) inversely proportional to H3/2

A

Admin • 802.91K Points
Coach

Q. The hydraulic efficiency of an impulse turbine is the

  • (A) ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
  • (B) ratio of the actual work available at the turbine to the energy imparted to the wheel
  • (C) ratio of the work done on the wheel to the energy of the jet
  • (D) none of the above

A

Admin • 802.91K Points
Coach

Q. Which of the following pump is generally used to pump highly viscous fluid?

  • (A) Centrifugal pump
  • (B) Reciprocating pump
  • (C) Air lift pump
  • (D) Screw pump

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