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Q1. If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
(A) Geometric similarity
(B) Kinematic similarity
(C) Dynamic similarity
(D) None of these
Answer:(A) Geometric similarity
Q2. Kinematic similarity is said to exist between the model and the prototype, if both of them
(A) Have identical velocities
(B) Are equal in size and shape
(C) Are identical in shape, but differ only in size
(D) Have identical forces
Answer: (A) Have identical velocities
Q3. The speed ratio in case of Francis turbine varies from
(A) 0.15 to 0.3
(B) 0.4 to 0.5
(C) 0.6 to 0.9
(D) 1 to 1.5
Answer: (C) 0.6 to 0.9
Q4. The width of the bucket for a Pelton wheel is generally __ the diameter of jet.
(A) Double
(B) Three times
(C) Four times
(D) Five times
Answer: (D) Five times
Q5. The specific speed of a turbine is given by the equation
(A) N√P / H3/2
(B) N√P / H²
(C) N√P / H5/4
(D) N√P / H3
Answer: (C) N√P / H5/4
Q6. The overall efficiency of a reaction turbine is the ratio of
(A) Power produced by the turbine to the energy actually supplied by the turbine
(B) Actual work available at the turbine to the energy imparted to the wheel
(C) Work-done on the wheel to the energy (or head of water) actually supplied to the turbine
(D) None of the above
Answer: (A) Power produced by the turbine to the energy actually supplied by the turbine
Q7. Axial flow pump is started with its delivery valve
(A) Kept fully closed
(B) Kept fully open
(C) Irrespective of any position
(D) Kept 50% open
Answer: (B) Kept fully open
Q8. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be
(A) Horizontal
(B) Nearly horizontal
(C) Steep
(D) First rise and then fall
Answer: (C) Steep
Q9. Delivery head of a centrifugal pump is
(A) Directly proportional to N
(B) Inversely proportional to N
(C) Directly proportional to N²
(D) Inversely proportional to N²
Answer: (C) Directly proportional to N²
Q10. Mechanical efficiency of a centrifugal pump is the ratio of
(A) Energy available at the impeller to the energy supplied to the pump by the prime mover
(B) Actual work-done by the pump to the energy supplied to the pump by the prime mover
(C) Energy supplied to the pump to the energy available at the impeller
(D) Manometric head to the energy supplied by the impeller per kN of water
Answer: (A) Energy available at the impeller to the energy supplied to the pump by the prime mover
Q11. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
(A) 39.2%
(B) 48.8%
(C) 84.8%
(D) 88.4%
Answer: (C) 84.8%
Q12. The unit discharge through the turbine is
(A) Q/√H
(B) Q/H
(C) Q/H3/2
(D) Q/H²
Answer: (A) Q/√H
Q13. The optimum value of vane exit angle for a centrifugal pump impeller is
(A) 10-15°
(B) 20-25°
(C) 30-40°
(D) 50-60°
Answer: (B) 20-25°
Q14. For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred
(A) Centrifugal
(B) Axial flow
(C) Reciprocating
(D) Mixed flow
Answer:(B) Axial flow
Q15. The specific speed of turbine is defined as the speed of a unit
(A) Of such a size that it delivers unit discharge at unit head
(B) Of such a size that it delivers unit discharge at unit power
(C) Of such a size that it requires unit power per unit head
(D) Of such a size that it produces unit horse power with unit head
Answer: (D) Of such a size that it produces unit horse power with unit head
Q16. Which place in hydraulic turbine is most susceptible for cavitations?
(A) Inlet of draft rube
(B) Blade inlet
(C) Guide blade
(D) Penstock
Answer: (A) Inlet of draft rube
Q17. In order to avoid cavitation in centrifugal pumps
(A) The suction pressure should be high
(B) The delivery pressure should be high
(C) The suction pressure should be low
(D) The delivery pressure should be low
Answer: (A) The suction pressure should be high
Q18. The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is
(A) (waV/2g) × sin θ
(B) (waV/g) × sin θ
(C) (waV²/2g) × sin 2θ
(D) (waV²/g) × sin θ
Answer: (C) (waV²/2g) × sin 2θ
Q19. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
(A) 0.26
(B) 0.36
(C) 0.46
(D) 0.56
Answer: (C) 0.46
Q20. In an inward flow reaction turbine
(A) The water flows parallel to the axis of the wheel
(B) The water enters at the center of the wheel and then flows towards the outer periphery of the wheel
(C) The water enters the wheel at the outer periphery and then flows towards the center of the wheel
(D) The flow of water is partly radial and partly axial
Answer: (C) The water enters the wheel at the outer periphery and then flows towards the center of the wheel
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