Hydraulic Machines Objective Questions with Answers - Set 10 - ObjectiveBooks

Practice Test: Question Set - 10

1. The unit speed of the turbine runner is
(A) N/√H
(B) N/H
(C) N/H3/2
(D) N/H²

2. Motion of a liquid in a volute casing of a centrifugal pump is an example of
(A) Rotational flow
(C) Forced spiral vortex flow
(D) Spiral vortex flow

3. The runaway speed of a hydraulic turbine is the speed
(B) At which there will be no damage to the runner
(C) Corresponding to maximum overload permissible
(D) At which the turbine will run freely without load

4. High 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

5. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
(A) Slow speed pump with radial flow at outlet
(B) Medium speed pump with radial flow at outlet
(C) High speed pump with radial flow at outlet
(D) High speed pump with axial flow at outlet

6. 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

7. The flow rate in gear pump
(A) Increases with increase in pressure
(B) Decreases with increase in pressure
(C) More or less remains constant with increase in pressure
(D) Unpredictable

8. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
(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

9. Francis, Kaplan and propeller turbines fall under the category of
(A) Impulse turbines
(B) Reaction turbines
(C) Axial flow turbines
(D) Mixed flow turbines

10. Which of the following is not a reaction turbine?
(A) Fourneyron turbine
(B) Journal turbine
(C) Thomson's turbine
(D) Pelton wheel

11. A turbine develops 10000 kW under a head of 25 meters at 135 r.p.m. Its specific speed is
(A) 175.4 r.p.m.
(B) 215.5 r.p.m.
(C) 241.5 r.p.m.
(D) 275.4 r.p.m

12. According to fan laws, for the fans having constant wheel diameters, the power demand varies
(A) Directly as fan speed
(B) Square of fan speed
(C) Cube of fan speed
(D) Square root of fan speed

13. Which of the following statement is correct?
(A) The centrifugal pump is suitable for large discharge and smaller heads
(B) The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump
(C) The efficiency of centrifugal pump is less as compared to reciprocating pump
(D) All of the above

14. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure 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

15. In a centrifugal pump, the regulating valve is provided on the
(A) Casing
(B) Delivery pipe
(C) Suction pipe
(D) Impeller

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