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Mechanical Engineering Mcqs

Phenomenon of choking in compressor means __________________?

  • (A)  no flow of air
  • (B)  fixed mass flow rate regardless of pressure ratio
  • (C)  reducing mass flow rate with increase in pressure ratio
  • (D)  increased inclination of chord with air steam
  • (E)  does not occur
Submitted By :Ali Uppal


The ratio of isentropic work to Euler work is known as_____________________?

  • (A)  pressure coefficient
  • (B)  work coefficient
  • (C)  polytropic reaction
  • (D)  slip factor
  • (E)  compressor efficiency
Submitted By :Ali Uppal


The indicated work per unit mass of air delivered is___________________?

  • (A)  directly proportional to clearance volume
  • (B)  greatly affected by clearance volume
  • (C)  not affected by clearance volume
  • (D)  inversely proportional to clearance volume
Submitted By :Ali Uppal


As the value of index ‘«’ is decreased, the volumetric efficiency will___________________?

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


The advantage of multistage compression over single stage compression is ________________?

  • (A)  lower power consumption per unit of air delivered
  • (B)  higher volumetric efficiency
  • (C)  decreased discharge temperature
  • (D)  moisture free air
  • (E)  all of the above
Submitted By :Ali Uppal


In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to ____________________?

  • (A)  N.T.P. conditions
  • (B)  intake temperature and pressure conditions
  • (C)  0°C and 1 kg/cm2
  • (D)  20°C and 1 kg/cm2
  • (E)  none of the above
Submitted By :Ali Uppal


Submitted By :Ali Uppal


During base load operation, the best method of controlling compressor is ___________________?

  • (A)  start-stop motor
  • (B)  constant speed unloader
  • (C)  relief valve
  • (D)  variable speed
  • (E)  none of the above
Submitted By :Ali Uppal


The ratio of isentropic work to euler’s work is known as _____________________?

  • (A)  compressor efficiency
  • (B)  isentropic efficiency
  • (C)  Euler’s efficiency
  • (D)  pressure coefficient
  • (E)  pressure ratio
Submitted By :Ali Uppal


The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?

  • (A)  slip factor
  • (B)  velocity factor
  • (C)  velocity coefficient
  • (D)  blade effectiveness
Submitted By :Ali Uppal