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Total Questions : 765 | Page 2 of 77 pages
Question 11. In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (w₁/w₂) with perfect intercooling is given by
  1.     W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)
  2.     W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
  3.     W₁/W₂ = n₁/n₂
  4.     W₁/W₂ = n₂/n₁
 Discuss Question
Answer: Option B. ->  W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
Explanation :
Question 12. If p₁, is the pressure of air entering the l.p. cylinder and p₂ is the pressure of air leaving the l.p. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where d₁ = dia. of l.p. cylinder, and d₂ = dia. of h.p. cylinder)
  1.     D₁/D₂ = p₁ p₂
  2.     D₁/D₂ = p₁/p₂
  3.     D₁/D₂ = p₂/p₁
  4.     None of these
 Discuss Question
Answer: Option C. ->  D₁/D₂ = p₂/p₁
Explanation :
Question 13. A 3 m³/min compressor means that it
  1.     Compresses 3 m³/min of standard air
  2.     Compresses 3 m³/ min of free air
  3.     Delivers 3 m³/ min of compressed air
  4.     Delivers 3 m³/ min of compressed air at delivery pressure
 Discuss Question
Answer: Option B. ->  Compresses 3 m³/ min of free air
Explanation :
Question 14. A 3 m³/min compressor means that it
  1.     Compresses 3 m³/min of standard air
  2.     Compresses 3 m³/ min of free air
  3.     Delivers 3 m³/ min of compressed air
  4.     Delivers 3 m³/ min of compressed air at delivery pressure
 Discuss Question
Answer: Option B. ->  Compresses 3 m³/ min of free air
Explanation :
Question 15. A 3 m³/min compressor means that it
  1.     Compresses 3 m³/min of standard air
  2.     Compresses 3 m³/ min of free air
  3.     Delivers 3 m³/ min of compressed air
  4.     Delivers 3 m³/ min of compressed air at delivery pressure
 Discuss Question
Answer: Option B. ->  Compresses 3 m³/ min of free air
Explanation :
Question 16. A 3 m³/min compressor means that it
  1.     Compresses 3 m³/min of standard air
  2.     Compresses 3 m³/ min of free air
  3.     Delivers 3 m³/ min of compressed air
  4.     Delivers 3 m³/ min of compressed air at delivery pressure
 Discuss Question
Answer: Option B. ->  Compresses 3 m³/ min of free air
Explanation :
Question 17. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio
  1.    Increases
  2.    Decreases
  3.    Remain same
  4.    First increases and then decreases
 Discuss Question
Answer: Option A. -> Increases
Question 18. Inter-cooling in gas turbine results in
  1.    Increase in net output but decrease in thermal efficiency
  2.    Increase in thermal efficiency but decrease in net output
  3.    Increase in both thermal efficiency and net output
  4.    Decrease in both thermal efficiency and net output
 Discuss Question
Answer: Option A. -> Increase in net output but decrease in thermal efficiency
Question 19. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches
  1.    Isothermal
  2.    Isentropic
  3.    Adiabatic
  4.    Isochoric
 Discuss Question
Answer: Option A. -> Isothermal
Question 20. Reheating in gas turbine results in
  1.    Increase of work ratio
  2.    Decrease of thermal efficiency
  3.    Decrease of work ratio
  4.    Both (A) and (B) above
 Discuss Question
Answer: Option D. -> Both (A) and (B) above

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