In a Kaplan turbine runner, the numbers of blades are generally between

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

which of the following components of reaction turbine increases the head on the turbine by an amount equal to the height of runner outlet above the tail race ?

A

Scroll casing

B

Guide vanes

C

Draft tube

D

Moving vanes

An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.

A

Equal

B

Less

C

More

D

None of these

Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

A

Lift and resultant force

B

Drag and resultant force

C

Lift and tangential force

D

Lift and drag

The ratio of the workdone on the blades to the energy supplied to the blades, is called

A

Blading efficiency

B

Nozzle efficiency

C

Gross or stage efficiency

D

Mechanical efficiency

The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

A

Inlet tip of a blade curves in a direction opposite to that

B

Outlet tip of a blade curves in a direction opposite to that

C

Inlet tip of a blade is towards the direction

D

Outlet tip of a blade is towards the direction

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

The unit speed of the turbine runner is

A

$$\frac{{\text{N}}}{{\sqrt {\text{H}} }}$$

B

$$\frac{{\text{N}}}{{\text{H}}}$$

C

$$\frac{{\text{N}}}{{{{\text{H}}^{\frac{3}{2}}}}}$$

D

$$\frac{{\text{N}}}{{{{\text{H}}^2}}}$$

The speed of a turbine runner is

A

Directly proportional to $${{\text{H}}^{\frac{1}{2}}}$$

B

Inversely proportional to $${{\text{H}}^{\frac{1}{2}}}$$

C

Directly proportional to $${{\text{H}}^{\frac{3}{2}}}$$

D

Inversely proportional to $${{\text{H}}^{\frac{3}{2}}}$$

The pump impeller and the turbine runner in a hydraulic torque converter

A

Have the same diameter

B

Have different diameters

C

Are directly coupled

D

None of these

In a Kaplan turbine runner, the numbers of blades are generally between

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