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MCQs

Total Questions : 192 | Page 8 of 20 pages
Question 71. There is no ideal angle of attack for best rotation.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 72. The speed at the tip of the blade is faster than its center.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 73. What is the angle by which the rotor blades are twisted?
  1.    5-10 degrees
  2.    15-45 degrees
  3.    100-120 degrees
  4.    10-20 degrees
 Discuss Question
Answer: Option D. -> 10-20 degrees
Answer: (d).10-20 degrees
Question 74. Which of the following blade designs further increases the efficiency of airfoil blades?
  1.    Twisting and tapering the blades
  2.    Reducing wind tower height
  3.    Increasing wind tower height
  4.    Increasing rotor speed
 Discuss Question
Answer: Option A. -> Twisting and tapering the blades
Answer: (a).Twisting and tapering the blades
Question 75. Why is a blade twisted along its length rather than its width?
  1.    Drag reduction
  2.    Weight reduction
  3.    Drag reduction and improvement in angle of attack
  4.    Aesthetic reasons
 Discuss Question
Answer: Option C. -> Drag reduction and improvement in angle of attack
Answer: (c).Drag reduction and improvement in angle of attack
Question 76. Which of the following blade designs further increases the efficiency of airfoil blades?
  1.    Reducing wind tower height
  2.    Twisting and tapering the blades
  3.    Increasing wind tower height
  4.    Increasing rotor speed
 Discuss Question
Answer: Option B. -> Twisting and tapering the blades
Answer: (b).Twisting and tapering the blades
Question 77. Why does wind speed increase with height above ground?
  1.    More slip boundary conditions
  2.    Less obstructions and no slip boundary conditions
  3.    More obstructions and slip boundary conditions
  4.    Gas molecules have less mass
 Discuss Question
Answer: Option B. -> Less obstructions and no slip boundary conditions
Answer: (b).Less obstructions and no slip boundary conditions
Question 78. Increased wind tower height and longer blades do not result in an increase in power.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 79. Which of the following is best reason for not using longer blades even though they produce greater output power?
  1.    Longer turbine blades experience greater forces
  2.    Longer turbine blades experience lesser forces
  3.    Safety concerns due to greater momentum of longer blades
  4.    Stronger materials are available in abundance
 Discuss Question
Answer: Option C. -> Safety concerns due to greater momentum of longer blades
Answer: (c).Safety concerns due to greater momentum of longer blades
Question 80. Why should longer turbine blades be made of stronger materials?
  1.    Longer turbine blades experience greater forces
  2.    Longer turbine blades experience lesser forces
  3.    Stronger materials are cheaper
  4.    Stronger materials are available in abundance
 Discuss Question
Answer: Option A. -> Longer turbine blades experience greater forces
Answer: (a).Longer turbine blades experience greater forces

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