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MCQs

Total Questions : 765 | Page 73 of 77 pages
Question 721. The air power of the compressor is also known as
  1.    Frictional power
  2.    None of these
  3.    Indicated power
  4.    Brake power
 Discuss Question
Answer: Option C. -> Indicated power
Question 722. The efficiency of jet engine is
  1.    Lower at low speed
  2.    Same at all altitudes
  3.    Higher at high speed
  4.    Higher at high altitudes
 Discuss Question
Answer: Option D. -> Higher at high altitudes
Question 723. A machine used to raise the pressure of air is called
  1.    Gas turbine
  2.    Air motor
  3.    Compressor
  4.    I.C engine
 Discuss Question
Answer: Option C. -> Compressor
Question 724. To avoid moisture troubles, the compressed air main line should
  1.    Be laid vertically
  2.    Rise gradually towards the point of use
  3.    Be laid exactly horizontally
  4.    Drop gradually towards the point of use
 Discuss Question
Answer: Option D. -> Drop gradually towards the point of use
Question 725. The ratio of the discharge pressure to the inlet pressure of air is called
  1.    Compressor efficiency
  2.    Volumetric efficiency
  3.    Expansion ratio
  4.    Compression ratio
 Discuss Question
Answer: Option D. -> Compression ratio
Question 726. The volume of air delivered in a medium capacity air compressor per unit time is
  1.    0.15 to 5 m³/s
  2.    None of these
  3.    0.1 to 1.2 m³/s
  4.    Above 5 m³/s
 Discuss Question
Answer: Option A. -> 0.15 to 5 m³/s
Question 727. The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)
  1.    p₂ = p₃/p₁
  2.    p₂ = p₁ × p₂
  3.    p₂ = p₁/p₃
  4.    p₂ = p₁ × p₃
 Discuss Question
Answer: Option B. -> p₂ = p₁ × p₂
Question 728. For perfect intercooling in a three stage compressor
  1.    p₁ p₂ = p₃ p₄
  2.    p₃/p₁ = p₄/p₂
  3.    p₂/p₁ = p₃/p₂ = p₄/p₃
  4.    p₁ p₃ = p₂ p₄
 Discuss Question
Answer: Option C. -> p₂/p₁ = p₃/p₂ = p₄/p₃
Question 729. Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm. The air pressure will be
  1.    1.00 kg/cm²
  2.    0.53 kg/cm²
  3.    1.06 kg/cm²
  4.    1.03 kg/cm²
 Discuss Question
Answer: Option A. -> 1.00 kg/cm²
Question 730. For perfect intercooling in a two stage compressor
  1.    p₂/p₁ = p₃/p₂
  2.    p₁ = p3
  3.    p₁ = p₂ p3
  4.    p₁/p₃ = p₂/p₁
 Discuss Question
Answer: Option A. -> p₂/p₁ = p₃/p₂

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