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Mechanical Engineering Mcqs

The compressor efficiecny is the__________________?

  • (A)  isothermal H.P/indicated H.R
  • (B)  isothermal H.P./shaft H.R
  • (C)  total output/air input
  • (D)  compression work/motor input
  • (E)  none Of the above
Submitted By :Ali Uppal


For a compressor, least work will be done if the compression is________________ ?

  • (A)  isentropic
  • (B)  isothermal
  • (C)  polytropic
  • (D)  somewhere in between isentropic and isothermal
  • (E)  none of the above
Submitted By :Ali Uppal


To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?

  • (A)  top side of main
  • (B)  bottom side of main
  • (C)  left side of main
  • (D)  right side of main
  • (E)  any location
Submitted By :Ali Uppal


To aviod moisture troubles, the compressed air main line should __________________?

  • (A)  rise gradually towards the point of use
  • (B)  drop gradually towards the point of use
  • (C)  be laid vertically
  • (D)  be laid exactly horizontally
  • (E)  none of the above
Submitted By :Ali Uppal


The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

  • (A)  less
  • (B)  more
  • (C)  same
  • (D)  more/less depending on compressor capacity
  • (E)  unpredictable
Submitted By :Ali Uppal


The thrust on the rotor in a centrifugal compressor is produced by________________?

  • (A)  radial component
  • (B)  axial component
  • (C)  tangential component
  • (D)  resultant component
Submitted By :Ali Uppal


A compressor at high altitude will draw________________?

  • (A)  more power
  • (B)  less power
  • (C)  same power
  • (D)  more/less power depending on other factors
  • (E)  none of the above
Submitted By :Ali Uppal


A centrifugal compressor works on the principle of__________________?

  • (A)  conversion of pressure energy into kinetic energy
  • (B)  conversion of kinetic energy into pres¬sure energy
  • (C)  centripetal action
  • (D)  generating pressure directly
  • (E)  combination of
Submitted By :Ali Uppal


Submitted By :Ali Uppal


Diffuser in a compressor is used to _____________________?

  • (A)  increase velocity
  • (B)  make the flow stream-line
  • (C)  convert pressure energy into kinetic energy
  • (D)  convert kinetic energy into pressure energy
  • (E)  increase degree of reaction
Submitted By :Ali Uppal