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Mechanical Engineering Mcqs

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?

  • (A)  2 kg/cm2
  • (B)  6 kg/cm2
  • (C)  10 kg/cm2
  • (D)  14.7 kg/cm2
  • (E)  none of the above
Submitted By :Ali Uppal


Pick up the wrong statement about advantages of multistage compression____________________?

  • (A)  better lubrication is possible advantages of multistage
  • (B)  more loss of air due to leakage past the cylinder
  • (C)  mechanical balance is better
  • (D)  air can be cooled perfectly in between
  • (E)  more uniform torque, light cylinder and saving in work
Submitted By :Ali Uppal


Losses in a centrifugal compressor are due to__________________?

  • (A)  inlet losses
  • (B)  impeller channel losses
  • (C)  diffuser losses
  • (D)  all of the above
  • (E)  none of the above
Submitted By :Ali Uppal


Submitted By :Ali Uppal


The criterion of the thermodynamic efficiency for rotary compressor is_________________?

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


Submitted By :Ali Uppal


For minimum work in multistage compression, assuming same index of compression in all stages_________________?

  • (A)  work done in first stage should be more
  • (B)  work done in subsequent stages should increase
  • (C)  work done in subsequent stages should decrease
  • (D)  work done in all stages should be equal
  • (E)  work done in any stage is no criterion for minimum work but depends on other factors
Submitted By :Ali Uppal


Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?

  • (A)  less power requirement
  • (B)  better mechanical balance
  • (C)  less loss of air due to leakage past the cylinder
  • (D)  more effective lubrication
  • (E)  lower volumetric efficiency
Submitted By :Ali Uppal


The work ratio of simple gas turbine cycle depends on_________________?

  • (A)  pressure ratio
  • (B)  maximum cycle temperature
  • (C)  minimum cycle temperature
  • (D)  all of the above
  • (E)  none of die above
Submitted By :Ali Uppal


The vloumetric efficiency of compressor with increase in compression ratio will ___________________?

  • (A)  increase
  • (B)  decrease
  • (C)  remain same
  • (D)  may increase/decrease depending on clearance volume
  • (E)  none of the above
Submitted By :Ali Uppal