The flow ratio in case of Francis turbine varies from

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

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

Which type of turbine is a Francis Turbine?

A

Impulse Turbine

B

Screw Turbine

C

Reaction turbine

D

Turgo turbine

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

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

Francis turbine is best suited for

A

Medium head application from 24 to 180 m

B

Low head installation up to 30 m

C

High head installation above 180 m

D

All types of heads

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 specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

A

Increase first at fast rate and then slow

B

Increase first at slow rate and then fast

C

Decrease continuously

D

First increase, reach maximum and then decrease

There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

A

Remain same

B

Decrease

C

Increase

D

None of the above

If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?

A

$$\left( {A + B} \right)\alpha \,C$$

B

$$\left( {A - B} \right)\alpha \,\frac{1}{C}$$

C

$$\sqrt {AB} \,\alpha \,C$$

D

$$\frac{A}{B} = {\text{constant}}$$

The flow ratio in case of Francis turbine varies from

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