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QUESTION: 1

A pump running at 1414 rpm delivers 256 *l*ps of water against a head of 16 m. The pump is of the

Solution:

QUESTION: 2

Consider the following statements:

1. Specific speed uniquely determines the type, shape and design of the turbine.

2. Both unit speed ‘n_{11}’ and unit discharge ‘Q_{11}’ are necessary to uniquely determine the type and design of the turbine.

Which of these statements is/are correct in respect of a hydraulic turbine?

Solution:

Specific speed is independent of dimension or size of the actual turbine and specific turbine

Further, N_{s} = 3.13Nu

Therefore besides unit speed and unit discharge overall efficiency is also required to determine type and design of turbine.

QUESTION: 3

If the radius of the centrifugal pump impeller is reduced from 10 cm, the head developed by the pump will change from 10 m to

Solution:

ND/√H will remain same even when diameter is reduced.

QUESTION: 4

A Francis turbine working at 400 rpm has a unit speed of 50 rpm and develops 500 kW of power. What is the effective head under which this turbine operates?

Solution:

Unit speed of the turbine is given by,

QUESTION: 5

For a hydro-electric project with reaction turbine, the draft tube at the exit from the turbine is

Solution:

Draft tube must be air-tight and under all-conditions of its operation its lower end must be submerged below the level of water in the tail race. It has two purposes:

(i) Permits a negative or suction head to be established at the runner exit.

(ii) Converts a large portion of velocity energy rejected from the runner into useful pressure energy.

QUESTION: 6

In case of semi-circular vanes, thb theoretical maximum efficiency of the wheel can be

Solution:

For θ = 0°, the curved vanes will become semicircular and η_{max} = 1 or 100%.

QUESTION: 7

Two geometrically similar pumps are running at the same speed of 100 rpm and lifting water against the heads of 25 m and 16 m respectively. First pump is having an impeller diameter of 300 mm. The impeller diameter of second pump shall be

Solution:

Equating head coefficients, we get,

QUESTION: 8

Which one of the following statements is correct?

Solution:

If coefficient of discharge is more than one, negative slip would occur.

QUESTION: 9

The specific speed of a turbine under a head of 150 m to develop 2000 HP while running at 300 rpm is

Solution:

QUESTION: 10

A pelton wheel operates at 630 rpm taking 3 m^{3}/s of water under a head of 256 m with a speed ratio of 0.48 (Given = 4.43) What is the diameter of the impeller?

Solution:

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