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

In a Kaplan 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 type of turbine is a Francis Turbine?

A

Impulse Turbine

B

Screw Turbine

C

Reaction turbine

D

Turgo turbine

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

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

A Francis turbine is used when the available head of water is

A

0 to 25 m

B

25 m to 250 m

C

Above 250 m

D

None of these

The flow ratio of Francis turbine is defined as the ratio of the

A

Velocity of flow at inlet to the theoretical jet velocity

B

Theoretical velocity of jet to the velocity of flow at inlet

C

Velocity of runner at inlet to the velocity of flow at inlet

D

None of the above

The flow ratio in case of Francis turbine varies from

A

0.15 to 0.3

B

0.4 to 0.5

C

0.6 to 0.9

D

1 to 1.5

The speed ratio in case of Francis turbine varies from

A

0.15 to 0.3

B

0.4 to 0.5

C

0.6 to 0.9

D

1 to 1.5

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

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