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Mechanical Engineering Mcqs

During peak load periods, the best method of controlling compressors is___________________?

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


An air compressor may be controlled by____________________?

  • (A)  throttle control
  • (B)  clearance control
  • (C)  blow-off control
  • (D)  any one of the above
  • (E)  none of the above
Submitted By :Ali Uppal


Separators in compressor installations are located_____________________?

  • (A)  before intercooler
  • (B)  after intercooler
  • (C)  after receiver
  • (D)  between after-cooler and air receiver
  • (E)  before suction
Submitted By :Ali Uppal


In multistage compressor, the isothermal compression is achieved by_________________?

  • (A)  employing intercooler
  • (B)  by constantly cooling the cylinder
  • (C)  by running compressor at very slow speed
  • (D)  by insulating the cylinder
  • (E)  none of the above
Submitted By :Ali Uppal


The capacity of compressor will be highest when its intake temperature is___________________?

  • (A)  lowest
  • (B)  highest
  • (C)  anything.
  • (D)  atmospheric
  • (E)  none of the above
Submitted By :Ali Uppal


Reciprocating air compressor is best suited for___________________?

  • (A)  large quantity of air at high pressure
  • (B)  small quantity of air at high pressure
  • (C)  small quantity of air at low pressure
  • (D)  large quantity of air at low pressure
  • (E)  any one of the above
Submitted By :Ali Uppal


After-cooler is used to__________________?

  • (A)  cool the air
  • (B)  decrease the delivery temperature for ease in handling
  • (C)  cause moisture and oil vapour to drop out
  • (D)  reduce volume
  • (E)  increase pressure
Submitted By :Ali Uppal


Rotary compressor is best suited for_____________________?

  • (A)  large quantity of air at high pressure
  • (B)  small quantity of air at high pressure
  • (C)  small quantity of air at low pressure
  • (D)  large quantity of air at low pressure
  • (E)  any one of the above
Submitted By :Ali Uppal


The volumetirc efficiency of a compressor is calculated on the basis of __________________?

  • (A)  volume of air inhaled at working conditions
  • (B)  volume of air inhaled at N.T.P. conditions
  • (C)  volume at 0°C and 1 kg/cm2
  • (D)  volume at 20°C and 1 kg/cm2
  • (E)  none of the above
Submitted By :Ali Uppal


For slow-speed large capacity compressor, following type of valve will be best suited________________?

  • (A)  poppet valve
  • (B)  mechanical valve of the corliss, sleeve, rotary or semirotary type
  • (C)  disc or feather type
  • (D)  any of the above
  • (E)  none of the above
Submitted By :Ali Uppal