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Mechanical Engineering Mcqs

Axial flow compressor resembles____________________ ?

  • (A)  centrifugal pump
  • (B)  reciprocating pump
  • (C)  turbine
  • (D)  sliding vane compressor
  • (E)  none of the above
Submitted By :Ali Uppal


Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm . The air pressure will be_____________________ ?

  • (A)  1.03 kg/cm2
  • (B)  1.06 kg/cm2
  • (C)  1.00 kg/cm2
  • (D)  0.53 kg/cm2
  • (E)  0.5 kg/cm2
Submitted By :Ali Uppal


Axial flow compressor has the following advantage over centrifugal compressor__________________?

  • (A)  larger air handling ability per unit frontal area
  • (B)  higher pressure ratio per stage
  • (C)  aerofoil blades are used
  • (D)  higher average velocities
  • (E)  none of the above
Submitted By :Ali Uppal


Maximum delivery pressure is a rotary air compressor is of the order of__________________?

  • (A)  6 kg/cm2
  • (B)  10 kg/cm2
  • (C)  16 kg/cm2
  • (D)  25 kg/cm2
  • (E)  40 kg/cm2
Submitted By :Ali Uppal


The thermodynamic efficiency of rotary compressor is based on_______________?

  • (A)  isothermal compression
  • (B)  adiabatic compression
  • (C)  isentropic compression
  • (D)  polytropic compression
  • (E)  none of the above
Submitted By :Ali Uppal


Surging is the phenomenon of___________________?

  • (A)  air stream blocking the passage
  • (B)  motion of air at sonic velocity
  • (C)  unsteady, periodic and reversed flow
  • (D)  air stream not able to follow the blade contour
  • (E)  production of no air pressure
Submitted By :Ali Uppal


Submitted By :Ali Uppal


The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?

  • (A)  low
  • (B)  high
  • (C)  same
  • (D)  low/high depending on make and type
  • (E)  unpredictable
Submitted By :Ali Uppal


Rotary compressors are suitable for ____________________?

  • (A)  large discharge at high pressure
  • (B)  low discharge at high pressure
  • (C)  large discharge at low pressure
  • (D)  low discharge at low pressure
  • (E)  there is no such limitation
Submitted By :Ali Uppal


Gas turbine works on______________?

  • (A)  Brayton or Atkinson cycle
  • (B)  Carnot cycle
  • (C)  Rankine cycle
  • (D)  Erricsson cycle
  • (E)  Joule cycle
Submitted By :Ali Uppal