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Total Questions : 104 | Page 11 of 11 pages
Question 101. For a given inlet condition, if the turbine inlet temperature is fixed, what value of compressor efficiency given below leads to the lowest amount of fuel added in the combustor of a gas turbine engine?
  1.    1
  2.    0.95
  3.    0.85
  4.    0.8
 Discuss Question
Answer: Option D. -> 0.8


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Question 102. Consider one-dimensional isentropic flow at a Mach number of 0.5. If the area of cross-section of a streamtube increases by 3% somewhere along the flow, the corresponding percentage change in density is ________
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option A. -> 1


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Question 103. Three identical eagles of wing span s are flying side by side in a straight line with no gap between their wing tips. Assume a single horse shoe vortex model (of equal strength Γ) for each bird. The net downwash experienced by the middle bird is
  1.    Î“/∏s
  2.    Î“/2∏s
  3.    Î“/3∏s
  4.    4Γ/3∏s
 Discuss Question
Answer: Option C. -> Γ/3∏s


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Question 104. The potential flow model for a storm is represented by the superposition of a sink and a vortex. The stream function can be written in the (r, q) system as u= -A/2∏ q + T/2∏ ln r, where A = T = 100 m2/s. Assume a constant air density of 1.2 kg/m3. The gauge pressure at a distance of 100 m from the storm eye is
  1.    -∞
  2.    - 1.2/∏2
  3.    - 1.2/2∏2
  4.    - 1.2/4∏2
 Discuss Question
Answer: Option D. -> - 1.2/4∏2


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