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Q1. Francis turbine is best suited for
(A) Medium head application from 24 to 180 m
(B) Low head installation up to 30 m
(C) High head installation above 180 m
(D) All types of heads
Answer: (A) Medium head application from 24 to 180 m
Q2. A hydraulic ram is a device used to
(A) Store the energy of water
(B) Increase the pressure of water
(C) To lift water from deep wells
(D) To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Answer: (D) To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Q3. Head developed by a centrifugal pump depends on
(A) Impeller diameter
(B) Speed
(C) Fluid density
(D) Both (A) and (B) above
Answer: (D) Both (A) and (B) above
Q4. A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is
(A) 0.25 m3/s
(B) 0.5 m3/s
(C) 1.5 m3/s
(D) 2.5 m3/s
Answer: (A) 0.25 m3/s
Q5. The Fourneyron turbine is _ reaction turbine.
(A) An axial flow
(B) An inward flow
(C) An outward flow
(D) A mixed flow
Answer: (C) An outward flow
Q6. Francis, Kaplan and propeller turbines fall under the category of
(A) Impulse turbines
(B) Reaction turbines
(C) Axial flow turbines
(D) Mixed flow turbines
Answer: (B) Reaction turbines
Q7. Indicator diagram of a reciprocating pump is a graph between
(A) Flow vs. swept volume
(B) Pressure in cylinder vs. swept volume
(C) Flow vs. speed
(D) Pressure vs. speed
Answer: (B) Pressure in cylinder vs. swept volume
Q8. In a Francis turbine runner, the numbers of blades are generally between
(A) 2 to 4
(B) 4 to 8
(C) 8 to 16
(D) 16 to 24
Answer: (D) 16 to 24
Q9. A hydraulic press is a device used
(A) To store pressure energy which may be supplied to a machine later on
(B) To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
(C) To lift larger load by the application of a comparatively much smaller force
(D) All of the above
Answer: (C) To lift larger load by the application of a comparatively much smaller force
Q10. The specific speed (Ns) of a centrifugal pump is given by
(A) (N√Q)/H2/3
(B) (N√Q)/H3/4
(C) (N√Q)/H
(D) (N√Q)/H5/4
Answer: (B) (N√Q)/H3/4
Q11. In an outward flow reaction turbine
(A) The water flows parallel to the axis of the wheel
(B) The water enters at the centre 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 centre of the wheel
(D) The flow of water is partly radial and partly axial
Answer: (B) The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
Q12. The power produced by the reaction turbine is __ to the head of water.
(A) Directly proportional
(B) Inversely proportional
(C) 4th power
(D) None of these
Answer: (A) Directly proportional
Q13. Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)
(A) (w Hm) / (Q × ηo)
(B) (w Hm Q) / ηo
(C) (w Q) / (Hm × ηo)
(D) (w Q ηo) / Hm
Answer: (B) (w Hm Q) / ηo
Q14. According to fan laws, at constant speed and capacity, the pressure and power vary
(A) Directly as the air or gas density
(B) Inversely as square root of density
(C) Inversely as density
(D) As square of density
Answer: (A) Directly as the air or gas density
Q15. If the ratio’s of the corresponding forces acting at corresponding points 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: (C) Dynamic similarity
Q16. Power required to drive a centrifugal pump is directly proportional to _ of its impeller.
(A) Diameter
(B) Square of diameter
(C) Cube of diameter
(D) Fourth power of diameter
Answer: (D) Fourth power of diameter
Q17. Braking jet in an impulse turbine is used
(A) To break the jet of water
(B) To bring the runner to rest in a short time
(C) To change the direction of runner
(D) None of these
Answer: (B) To bring the runner to rest in a short time
Q18. Which of the following is not a reaction turbine?
(A) Fourneyron turbine
(B) Journal turbine
(C) Thomson’s turbine
(D) Pelton wheel
Answer: (D) Pelton wheel
Q19. The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is
(A) 1/√2
(B) 1/2
(C) 1
(D) √2
Answer: (B) 1/2
Q20. The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is
(A) ηh = ηo × ηm
(B) ηm = ηm × ηh
(C) ηo = ηh × ηm
(D) None of these
Answer: (C) ηo = ηh × ηm
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