250 Introduction to the Study of Science 



11. What machines make use of the energy of falling water? 

 12. Describe the Pelton wheel, giving conditions to which it is adapted 

 and recent notable installations of it. 



13. Describe the water turbine ; state conditions to which it is 

 adapted ; and examples of its use in well-known plants. 



14. Compare the Pelton wheel and the water turbine, giving at 

 least one point of similarity and one of difference. 



15. What is a machine? Can a machine create energy? Cite 

 examples of different kinds of machines in common use. 



16. Explain the method of calculating horse power as worked out 

 by Watt. 



17. Explain: Horse power equals Foot-pounds per minute 



33,000 foot-pounds per minute 



18. Explain: Efficiency equals Work delivered 



Energy supplied 



19. What connection is there between the improvement of means 

 of transmitting and controlling electric energy and the development 

 of water power ? 20. Mention instances of long distance high voltage 

 transmission of electricity. Give important details. 21. Give at 

 least five uses of electricity. 



22. If there is a flowing stream in your vicinity, show what favorable 

 and what unfavorable conditions it may present as a source of water 

 power ? 



