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Mechanical Engineering Mcqs

The clearance volume of the air compressor is kept minimum because____________________?

  • (A)  it allows maximum compression to be achieved
  • (B)  it greatly affects volumetric efficiency
  • (C)  it results in minimum work
  • (D)  it permits isothermal compression
  • (E)  none of the above
Submitted By :Ali Uppal


Ratio of indicated h.p. to shaft h.p. in known as__________________?

  • (A)  compressor efficiency
  • (B)  isothermal efficiency
  • (C)  volumetric efficiency
  • (D)  mechanical efficiency
  • (E)  adiabatic efficiency
Submitted By :Ali Uppal


Euler’s equation is applicable for__________________?

  • (A)  centrifugal compressor
  • (B)  axial compressor
  • (C)  pumps
  • (D)  all of the above
  • (E)  none of the above
Submitted By :Ali Uppal


Which is false statement about multistage compression ?

  • (A)  Power consumption per unit of air delivered is low
  • (B)  Volumetric efficiency is high
  • (C)  It is best suited for compression ratios around 7:1
  • (D)  The moisture in air is condensed in the intercooler
  • (E)  Outlet temperature is reduced
Submitted By :Ali Uppal


Out of the following, from where you will prefer to take intake for air compressor_________________?

  • (A)  from an air conditioned room maintained at 20°C
  • (B)  from outside atmosphere at 1°C
  • (C)  from coal yard side
  • (D)  from a side where cooling tower is located nearby
  • (E)  from any one of the above locations
Submitted By :Ali Uppal


Volumetric efficiency of a compressor with clearance volume ________________?

  • (A)  increases with increase in compression ratio
  • (B)  decreases with increase in compression ratio
  • (C)  in not dependent upon compression ratio
  • (D)  may increase/decrease depending on compressor capacity
  • (E)  unpredictable
Submitted By :Ali Uppal


Clearance volume in actual reciprocating compressors is essential __________________?

  • (A)  to accommedate Valves in the cylinder head
  • (B)  to provide cushioning effect
  • (C)  to attain high volumetric efficiency
  • (D)  to avoid mechanical bang of piston with cylinder head
  • (E)  to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
Submitted By :Ali Uppal


The net work input required for compressor with increase in clearance volume_____________________?

  • (A)  increases
  • (B)  decreases
  • (C)  remains same
  • (D)  increases/decreases depending on com-pressor capacity
  • (E)  unpredictable
Submitted By :Ali Uppal


The ratio of work doen per cycle to the swept volume in case of compressor is called ______________?

  • (A)  compression index
  • (B)  compression ratio
  • (C)  compressor efficiency
  • (D)  mean effective pressure
  • (E)  compressor effectiveness
Submitted By :Ali Uppal


The compressor performance at higher altitude compared to sea level will be _______________?

  • (A)  same
  • (B)  higher
  • (C)  lower
  • (D)  dependent on other factors
  • (E)  none of the above
Submitted By :Ali Uppal