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MCQs

Total Questions : 192 | Page 16 of 20 pages
Question 151. What is the main disadvantage of a downward wind turbine?
  1.    Increased tower shadow effect
  2.    Flexible rotor blades
  3.    Inflexible rotor blades
  4.    Bending of blades at high wind speeds
 Discuss Question
Answer: Option B. -> Flexible rotor blades
Answer: (b).Flexible rotor blades
Question 152. What is a vertical wind turbine?
  1.    Wind turbines are rotate about an axis perpendicular to the plane of wind streamlines
  2.    Wind turbines are rotate about an axis diagonal to the plane of ground
  3.    Wind turbines are rotate about an axis 30 degrees to the plane of ground
  4.    Wind turbines are rotate about an axis parallel to the plane of ground
 Discuss Question
Answer: Option A. -> Wind turbines are rotate about an axis perpendicular to the plane of wind streamlines
Answer: (a).Wind turbines are rotate about an axis perpendicular to the plane of wind streamlines
Question 153. What is the main advantage of any downwind turbine?
  1.    Inflexible rotor blades
  2.    Flexible rotor blades
  3.    Position of the rotor
  4.    Reduced tower shadow effect
 Discuss Question
Answer: Option B. -> Flexible rotor blades
Answer: (b).Flexible rotor blades
Question 154. What are the types of VAWT?
  1.    Lift, horizontal
  2.    Horizontal, vertical
  3.    Drag, lift
  4.    Urban wind turbines
 Discuss Question
Answer: Option C. -> Drag, lift
Answer: (c).Drag, lift
Question 155. What is a downwind turbine?
  1.    Rotor is positioned at the three-quarters of the height of the tower
  2.    Rotor of the turbine is in front of the unit
  3.    Rotor is positioned at the bottom of the tower
  4.    Rotor of the turbine is behind the unit
 Discuss Question
Answer: Option D. -> Rotor of the turbine is behind the unit
Answer: (d).Rotor of the turbine is behind the unit
Question 156. What is the function of rotor side converter?
  1.    To control the DC-link voltage
  2.    To ensure operation at large power factor
  3.    To control generator in terms of active and reactive power
  4.    To ensure operation at low power factor
 Discuss Question
Answer: Option C. -> To control generator in terms of active and reactive power
Answer: (c).To control generator in terms of active and reactive power
Question 157. What is the function of grid side converter?
  1.    To ensure operation at low power factor
  2.    To control generator in terms of reactive power
  3.    To control generator in terms of active power
  4.    To control the DC-link voltage
 Discuss Question
Answer: Option D. -> To control the DC-link voltage
Answer: (d).To control the DC-link voltage
Question 158. What is sub-synchronous mode in doubly-fed induction generator (DFIG)?
  1.    Rotor runs below synchronous speed
  2.    Rotor runs above synchronous speed
  3.    Rotor runs at synchronous speed
  4.    Slip power is fed into AC power supply
 Discuss Question
Answer: Option A. -> Rotor runs below synchronous speed
Answer: (a).Rotor runs below synchronous speed
Question 159. What is super-synchronous mode in doubly-fed induction generator (DFIG)?
  1.    Rotor runs below synchronous speed
  2.    Rotor runs above synchronous speed
  3.    Rotor runs at synchronous speed
  4.    Rotor takes power from AC mains
 Discuss Question
Answer: Option B. -> Rotor runs above synchronous speed
Answer: (b).Rotor runs above synchronous speed
Question 160. Which of the following generators are mostly used in WECS?
  1.    PMSG and SCIG
  2.    DFIG and SCIG
  3.    DFIG and PMSG
  4.    VAWT and HAWT
 Discuss Question
Answer: Option C. -> DFIG and PMSG
Answer: (c).DFIG and PMSG

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