Hydraulic Machines-Fluid Machineries - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. Low specific speed of a pump implies it is
(A) Centrifugal pump
(B) Mixed flow pump
(C) Axial flow pump
(D) None of the above

2. Head developed by a centrifugal pump is
(A) Proportional to diameter of impeller
(B) Proportional to speed of impeller
(C) Proportional to diameter and speed of impeller
(D) None of the above

3. In centrifugal pumps, maximum efficiency is obtained when the blades are
(A) Straight
(B) Bent forward
(C) Bent backward

4. A double overhung Pelton wheel has
(A) Two jets
(B) Two runners
(C) Four jets
(D) Four runners

5. Medium specific speed of a pump implies it is
(A) Centrifugal pump
(B) Mixed flow pump
(C) Axial flow pump
(D) Any one of the above

6. 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

7. 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°

8. Which of the following pump is suitable for small discharge and high heads?
(A) Centrifugal pump
(B) Axial flow pump
(C) Mixed flow pump
(D) Reciprocating pump

9. For small discharge at high pressure, following pump is preferred
(A) Centrifugal
(B) Axial flow
(C) Mixed flow
(D) Reciprocating

10. 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

11. Low specific speed of turbine implies it is
(A) Propeller turbine
(B) Francis turbine
(C) Impulse turbine
(D) Any one of the above

12. The function of guide vanes in a reaction turbine is to
(A) Allow the water to enter the runner without shock
(B) Allow the water to flow over them, without forming eddies
(C) Allow the required quantity of water to enter the turbine
(D) All of the above

13. Hydraulic accumulator is used for
(A) Accumulating oil
(B) Supplying large quantities of oil for very short duration
(C) Generally high pressures to operate hydraulic machines
(D) Supplying energy when main supply fails

14. The jet ratio is defined as the ratio of the
(A) Diameter of jet to the diameter of Pelton wheel
(B) Velocity of jet to the velocity of Pelton wheel
(C) Diameter of Pelton wheel to the diameter of jet
(D) Velocity of Pelton wheel to the velocity of jet

15. Maximum impulse will be developed in hydraulic ram when
(A) Waste valve closes suddenly
(B) Supply pipe is long
(C) Supply pipe is short
(D) Ram chamber is large

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