Hydraulic Machines MCQs

Question 1

If α is the angle of blade tip at outlet, then maximum hydraulic efficiency of an Impulse turbine is

Accepted Answer

(1+cos α)/ 2

Answer

(1-cos α)/ 2

Answer

(1-sin α)/ 2

Answer

(1+sin α)/ 2

Question 2

In reaction turbine

Accepted Answer

It is not exposed to atmosphere

Answer

Kinetic energy is appreciable as the fluid leaves the runner and enters draft tube

Answer

Total energy of fluid is converted to kinetic energy in the runner

Answer

It is exposed to atmosphere

Question 3

If α is the angle subtended by two adjacent buckets in a pelton wheel, then the no. of buckets is equal to

Accepted Answer

360/α

Answer

40/α

Answer

180/α

Answer

270/α

Question 4

Francis turbine is best suited for

Accepted Answer

Medium head application from 24 to 180 m

Answer

Low head installation upto 30 m

Answer

High head installation above 180 m

Answer

All types of heads

Question 5

Propeller turbine is best suited for

Accepted Answer

Low head installation upto 30 m

Answer

Medium head application from 20 to 180 m

Answer

High head installation above 180 m

Answer

All types of heads

Question 6

Specific speed for impulse wheels ranges from

Accepted Answer

0 to 4.5

Answer

10 to 100

Answer

80 to 200

Answer

250 to 300

Question 7

The ratio of power produced by the turbine to the energy actually supplied by the turbine is called

Accepted Answer

Overall efficiency

Answer

Mechanical efficiency

Answer

Hydraulic efficiency

Answer

Turbine efficiency

Question 8

The ratio of actual work available at the turbine to energy imparted to the wheel is called

Accepted Answer

Mechanical efficiency

Answer

Hydraulic efficiency

Answer

Overall efficiency

Answer

Turbine efficiency

Question 9

The ratio of the work done on the wheel to the energy (or head of water) actually supplied to the turbine is called

Accepted Answer

Hydraulic efficiency

Answer

Mechanical efficiency

Answer

Overall efficiency

Answer

Turbine efficiency