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MCQs

Total Questions : 765 | Page 76 of 77 pages
Question 751. Isothermal compression though most efficient, but is not practicable because
  1.    Compressor has to run at very slow speed to achieve it
  2.    It is impossible in practice
  3.    It requires very big cylinder
  4.    It does not increase pressure much
 Discuss Question
Answer: Option A. -> Compressor has to run at very slow speed to achieve it
Question 752. A jet engine has
  1.    Propeller at back
  2.    Propeller in front
  3.    Propeller on the top
  4.    No propeller
 Discuss Question
Answer: Option D. -> No propeller
Question 753. The type of rotary compressor used in aeroplanes, is of
  1.    Radial flow type
  2.    Axial flow type
  3.    Centrifugal type
  4.    None of these
 Discuss Question
Answer: Option B. -> Axial flow type
Question 754. The maximum delivery pressure in a rotary air compressor is
  1.    30 bar
  2.    20 bar
  3.    10 bar
  4.    50 bar
 Discuss Question
Answer: Option C. -> 10 bar
Question 755. Propulsion efficiency of the following order is obtained in practice
  1.    0.6
  2.    0.5
  3.    0.34
  4.    0.72
 Discuss Question
Answer: Option A. -> 0.6
Question 756. In a closed cycle gas turbine, the air is compressed
  1.    Polytropically
  2.    Isothermally
  3.    None of these
  4.    Isentropically
 Discuss Question
Answer: Option D. -> Isentropically
Question 757. In a double acting compressor, the air is compressed
  1.    In two cylinders on both sides of the piston
  2.    In a single cylinder on both sides of the piston
  3.    In two cylinders
  4.    In one cylinder
 Discuss Question
Answer: Option B. -> In a single cylinder on both sides of the piston
Question 758. Standard air is the air at
  1.    15°C and 1 kg/cm²
  2.    0°C and standard atmospheric conditions
  3.    Atmospheric conditions at any specific location
  4.    20°C and 1 kg/cm² and relative humidity 36%
 Discuss Question
Answer: Option D. -> 20°C and 1 kg/cm² and relative humidity 36%
Question 759. The work-done on a compressor will be minimum if air is taken from
  1.    A source of low temperature air
  2.    A source at 0° C
  3.    The atmosphere
  4.    A source of high temperature air
 Discuss Question
Answer: Option A. -> A source of low temperature air
Question 760. Free air is the air at
  1.    0°C and standard atmospheric conditions
  2.    20°C and 1 kg/cm² and relative humidity of 36%
  3.    Atmospheric conditions at any specific location
  4.    15°C and 1 kg/cm²
 Discuss Question
Answer: Option C. -> Atmospheric conditions at any specific location

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