# Mechanical Engineering - Hydraulic Machines

### Exercise

"Everything should be made as simple as possible, but not simpler."
- Albert Einstein
1.

Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

 A. diameter B. square of diameter C. cube of diameter D. fourth power of diameter

2.

The mechanical efficiency of an impulse turbine is

 A. ratio of the actual power produced by the turbine to the energy actually supplied by the turbine B. ratio of the actual work available at the turbine to the energy imparted to the wheel C. ratio of the Work done on the wheel to the energy of the jet D. none of the above

3.

The overshot water wheels are those in which the wheel runs entirely by the __________ of water.

 A. weight B. impulse

4.

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

 A. 2 to 4 B. 4 to 8 C. 8 to l6 D. 16 to 24

5.

If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

 A. H = Hg/hf B. H = Hg x hf C. H = Hg + hf D. H = Hg - hf