Windpump - Quiz

1. What is the primary design feature of a multi-bladed rotor?

A) Low aerodynamic drag
B) High tipspeed ratio
C) High starting torque
D) Automatic yaw control

2. What is the maximum efficiency of a multi-bladed rotor?

A) More than 50%
B) Exactly 40%
C) Exactly 35%
D) Less than 30%

3. Why do modern wind rotors outperform multi-bladed rotors in efficiency?

A) They do not use pistons
B) They are made of lighter materials
C) They operate at a higher tipspeed ratio
D) They have more blades

4. What does a multi-bladed rotor need to achieve better efficiency according to the text?

A) A highly variable stroke mechanism
B) A larger rotor diameter
C) A faster wind speed
D) A more powerful piston

5. To what factor is the energy demand of a fixed-stroke piston pump proportional?

A) Wind direction
B) Cube of wind speed
C) Rotor diameter
D) Pump speed

6. To what factor is the energy supply of a wind rotor proportional?

A) Cube of wind speed
B) Square of wind speed
C) Length of the crank
D) Pump speed

7. What happens when a wind rotor runs at over speed?

A) Mechanical failure of the crank
B) Loss of aerodynamic efficiency
C) Improvement in load matching
D) Increased suction force

8. How much can the flow rate increase with a variable stroke windpump compared to a fixed stroke one?

A) Three times
B) Four times
C) Ten percent
D) Two times

9. What device can help spread the torque of a piston pump to the crank descent?

A) A counterweight
B) An electric sensor
C) A hydraulic regulator
D) A secondary rotor

10. Where were variable stroke windpump experiments conducted between 1988 and 1990?

A) USDA-Agriculture Research Center-Texas
B) A private laboratory in California
C) A manufacturing plant in Texas
D) A university in New York

11. Why did the USDA variable stroke experiments fail to influence the market?

A) The designs were patented by competitors
B) The mechanical systems were too expensive
C) The pumps required too much wind to function
D) They did not attract the attention of manufacturers

12. After the variable stroke experiments, what did research focus on?

A) Wind-electric water pumping systems
B) Larger tower construction
C) Improved multi-bladed rotor blades
D) Solar-powered piston pumps

13. Which phase of a piston pump is described as very light?

A) Suction phase
B) Upstroke phase
C) Yawing phase
D) Descending phase

14. What type of patent was the Elmo G. Harris design?

A) Patent #877.617
B) Patent #189.900
C) Patent #617.877
D) Patent #4.392.785

15. Which type of pump is best paired with high solidity rotors?

A) Chain and washer pumps
B) Waterladder pumps
C) Positive displacement (piston) pumps
D) Centrifugal pumps

16. Which rotor type is recommended for driving an electricity generator?

A) Low solidity rotors
B) High solidity rotors
C) Fixed-stroke rotors
D) Single-acting rotors

17. What is the common nickname for multi-bladed windpumps in the US and Canada?

A) Butler mills
B) Piston pumps
C) Weathercocks
D) Wind vanes

18. In which years did the Butler brand introduce improvements to windpump technology?

A) 1897, 1898, and 1905
B) 1897, 1902, and 1910
C) 1887, 1890, and 1900
D) 1895, 1900, and 1905

19. How much water can a 16 ft diameter windpump lift per hour at 100 ft elevation with 15–20 mph winds?

A) Up to 500 US gallons
B) Up to 800 US gallons
C) Up to 1600 US gallons
D) Up to 3200 US gallons

20. How often do most windpumps require a change of gear box oil?

A) Monthly
B) Every six months
C) Every five years
D) Annually

21. What is the approximate number of windpumps still in use in the United States?

A) 10,000
B) 250,000
C) 100,000
D) 60,000

22. What is the annual windpower conversion efficiency range of common multi-bladed windpumps?

A) 20%–30%
B) 10%–15%
C) 1%–2%
D) 4%–8%

23. What is the main cause of the low conversion efficiency in multi-bladed windpumps?

A) High friction in the gear box
B) Low wind speeds at most locations
C) Excessive weight of the blades
D) Poor load matching between rotors and fixed-stroke piston pumps

24. Which pump types are best suited for use with low solidity rotors?

A) Only piston pumps
B) Centrifugal, waterladder, and chain and washer pumps
C) Only electricity generators
D) High-pressure hydraulic pumps

25. Which country is particularly well known for its windpumps?

A) Nicaragua
B) Australia
C) The Netherlands
D) Kenya

26. Which company manufactures the Kijito windpumps in Kenya?

A) East African Engineering Works
B) Intermediate Technology Development Group
C) Bobs Harries Engineering Ltd
D) Nicaragua Pump Systems

27. Who provided engineering support for the development of Kijito windpumps?

A) Intermediate Technology Development Group
B) The Kenyan Government
C) Dutch Drainage Experts
D) United Nations Water Council

28. How does a rope pump transport water?

A) By using a high-pressure air compressor
B) By using a series of interlocking gears
C) By pulling a knotted rope through a pipe
D) By using a vacuum seal and rotating blades

29. What material is usually used for the pipe in a rope pump?

A) Copper tubing
B) Cast iron pipe
C) Reinforced rubber hose
D) PVC pipe

30. What is a windpump also known as?

A) A water wheel
B) A drainage mill
C) A windmill generator
D) A steam engine

31. In what century were windpumps first used according to the text?

A) 9th century
B) 17th century
C) 12th century
D) 15th century

32. Who suggested improvements to windpumps in 'Van de Molens'?

A) Daniel Halladay
B) Benjamin Franklin
C) Simon Stevin
D) Isaac Newton

33. In what year did Simon Stevin receive a patent for his windpump innovation?

A) 1586
B) 1620
C) 1550
D) 1602

34. What type of wheel was used in Murcia, Spain, to raise water?

A) A turbine
B) A gear wheel
C) A flywheel
D) A noria

35. Who invented the self-regulating farm windpump in 1854?

A) George Stephenson
B) Thomas Edison
C) Simon Stevin
D) Daniel Halladay

36. What material replaced wood in the construction of later windpump towers?

A) Aluminum
B) Carbon fiber
C) Concrete
D) Steel

37. What was the estimated total capacity of US windpumps in 1930?

A) 300 megawatts
B) 50 megawatts
C) 150 megawatts
D) 500 megawatts

38. What happens if a pump rod is pushed down faster than gravity allows?

A) The water freezes
B) The rotor stops
C) The tower collapses
D) The rod buckles

39. What is the US term for the pipe containing the pump output?

A) Rising main
B) Suction line
C) Pressure conduit
D) Drop-pipe

40. Where were fluttering windpumps developed?

A) Netherlands
B) Canada
C) Turkey
D) Thailand

41. In what year did research begin on the modern variable stroke windpump in Turkey?

A) 1994
B) 2014
C) 2000
D) 2004

42. What type of rotor is used in the 30 kW variable stroke windpump design?

A) Savonius-type
B) Multiblade-type
C) Darrieus-type
D) Common sail

43. What does a high pressure vertical axis wind pump (HP-VAWP) combine with?

A) Drip irrigation system
B) Waterladder pump
C) Paddle pump
D) Archimedean screw

44. In the Netherlands, what device is connected to the tjasker's common sails?

A) Waterladder
B) Darrieus rotor
C) Paddle pump
D) Archimedean screw

45. What supports the windshaft of a tjasker?

A) A bamboo frame
B) A concrete pillar
C) A steel tower
D) A tripod

46. Where are traditional Thai windpumps used?

A) Deep water wells
B) Large irrigation canals
C) Salt pans
D) Mountainous regions

47. What materials are used to construct traditional Thai windpump sails?

A) Plastic sheets
B) Hardwood planks
C) Fabric or bamboo-mat
D) Steel or aluminum

48. What kind of connection is created in a vertical axis wind pump?

A) Basic shaft connection
B) Belt drive connection
C) Gearbox connection
D) Wireless connection

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