B. WIND POWER Flashcards

1
Q
  1. In an aerogenerator exceeding 100 kw capacity, which part is responsible in converting rotational movement to
    electricity?

A. Rotor
B. Turbine
C. Alternator
D. Governor

A

Answer: C

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2
Q
  1. What component of force is used in multi-bladed windmills?

A. Lift force
B. Drag force
C. Side force
D. Drop force

A

Answer: A

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3
Q
  1. What component of force is used in savonius windmills?

A. Lift force
B. Drag force
C. Side force
D. Drop force

A

Answer: B

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4
Q
  1. The type of pump is appropriate for multi-bladed windmills.

A. Hydraulic
B. Pneumatic
C. Reciprocating
D. Diaphragm

A

Answer: C

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5
Q
  1. While the windmill is in operation, what efficiency can exceed 100%?

A. Volumetric
B. Transmission
C. Rotor
D. All of the above

A

Answer: A

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6
Q
  1. What wind energy resource is located about 10-16 km from Earth surface with velocity over 150 kph?

A. Terrestrial wind
B. Extra-terrestrial wind
C. Jet stream
D. High wind

A

Answer: C

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7
Q
  1. In multi-bladed windpumps, which part is responsible in converting rotational movement to reciprocating action?

A. Rotor
B. Connecting rod
C. Reciprocating pump
D. Crank arm

A

Answer: B

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8
Q
  1. What tail type of multi-bladed windpump is more effective for windy areas?

A. Hinged side vane
B. Ecliptic
C. Manual folding
D. No tail

A

Answer: A

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9
Q

MODERATE QUESTIONS:
1. In wind farm development, which should be done first?

A. Rotor
B. Energy demand survey
C. Transmission
D. Wind velocity measurement

A

Answer: D

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10
Q
  1. In multi-bladed windpump manufacturing, which should be done first?

A. Rotor blade
B. Rotor frame
C. Tower
D. Jig

A

Answer: D

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11
Q
  1. To have bigger water displacement volume in windpumps, which should be increased?

A. Connecting rod length
B. Rotor diameter
C. Crank arm
D. Well diameter

A

Answer: C

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12
Q
  1. In windmill design, what should be the average rotor blade twist angle in degrees to have a tip speed ratio of 1:1?

A. 30
B. 45
C. 60
D. 75

A

Answer: B

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13
Q
  1. If typical overall efficiency of savonius windmills is 7-10%, what is the typical overall efficiency of aerogenerators?

A. 7-10%
B. 15-17%
C. 18-21%
D. 90-95%

A

Answer: D

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14
Q
  1. If a multi-bladed windpump has a tip-speed ratio of 1:1, what windspeed is needed to have its rotor tip move at
  2. 2 m/s?

A. 1 m/s
B. 3 m/s
C. 1 ft/s
D. 3 ft/s

A

Answer: B
Solution:
Windspeed = tip speed, since tip-speed ratio is 1:1
= 3.2 m/s

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