Lakshya Education MCQs

Question: Volumetric efficiency of a compressor decreases with ________ in compression ratio.
Options:
A. Decrease
B. Increase
C. Remain same
D. Does not change
Answer: Option B
Explanation :

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Question 1. 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
Answer: Option C
Explanation :
Question 2. The pressure and temperature conditions of air at the suction of compressor are
  1.     Atmospheric
  2.     Slightly more than atmospheric
  3.     Slightly less than atmospheric
  4.     Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Answer: Option D
Explanation :
Question 3. Volumetric efficiency of a compressor decreases with ________ in compression ratio.
  1.     Decrease
  2.     Increase
  3.     Remain same
  4.     Does not change
Answer: Option B
Explanation :
Question 4. The pressure and temperature conditions of air at the suction of compressor are
  1.     Atmospheric
  2.     Slightly more than atmospheric
  3.     Slightly less than atmospheric
  4.     Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Answer: Option D
Explanation :
Question 5. If p₁ is the pressure of air entering the l.p, cylinder and p₃ is the pressure of air leaving the h.p. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
  1.     D₁/D₂ = (p₁ p₃)1/2
  2.     D₁/D₂ = (p₁/p₃)1/4
  3.     D₁/D₂ = (p₁ p₃)1/4
  4.     D₁/D₂ = (p₃/p₁)1/4
Answer: Option D
Explanation :
Question 6. 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
Answer: Option B
Explanation :

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