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Mechanical Engineering Mcqs

The maximum discharge through a chimney occurs when the height of chimney is_____________________?

  • (A)  infinitely long
  • (B)  around 200 meters
  • (C)  equal to the height of the hot gas column producing draught
  • (D)  outside temperature is very low
  • (E)  more than the tallest building nearby
Submitted By :Ali Uppal

Which is not correct statement about effect of sulphur in fuel ___________________?

  • (A)  it has heating value
  • (B)  it helps in electrostatic precipitation of ash in flue-gases
  • (C)  it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
  • (D)  it erodes furnace walls
  • (E)  none of the above
Submitted By :Ali Uppal

Which is not the correct statement about moisture in coal ______________________?

  • (A)  inherent moisture and surface mois¬ture are different things
  • (B)  in some coals moisture may be present upto 40%
  • (C)  some moisture in coal helps in better burning which is not possible with completely dry coal
  • (D)  it increases thermal efficiency
  • (E)  moisture in coal is removed before firing by heating it with hot air
Submitted By :Ali Uppal

Which is not correct statement about the function of furnace____________________?

  • (A)  to provide proper conditions for con-tinuous complete combustion
  • (B)  mix fuel with air and ignite
  • (C)  separate ash from coal
  • (D)  maintain heat supply to prepare and ignite the incoming fuel
  • (E)  to minimise radiation losses
Submitted By :Ali Uppal

Which is not correct statement about pulverised fuel firing ?

  • (A)  high burning rate is possible
  • (B)  heat release can be easily controlled
  • (C)  fuel burns economically
  • (D)  it is the best technique for burning high ash content fuel having low fusion ash
  • (E)  separate mills are required to powder the coal
Submitted By :Ali Uppal

Pick up wrong statement about desired properties of a good fuel__________________?

  • (A)  high calorific value
  • (B)  produce minimum smoke and gases
  • (C)  ease in storing
  • (D)  high ignition point
  • (E)  ecomomical
Submitted By :Ali Uppal

Submitted By :Ali Uppal

The radius of a dished head is taken approximately as______________________?

  • (A)  one-fourth
  • (B)  half
  • (C)  one
  • (D)  two
  • (E)  three
Submitted By :Ali Uppal

The overall efficiency of thermal power plant is________________?

  • (A)  boiler efficiency, turhine efficiecny, generator efficiency
  • (B)  all the three above plus gas cycle efficiency
  • (C)  carnot cycle efficiency
  • (D)  regenerative cycle efficiency
  • (E)  rankine cycle efficiency
Submitted By :Ali Uppal

In forced circulation type boiler__________________?

  • (A)  heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
  • (B)  water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
  • (C)  feed pump is employed to supplement natural circulation in water wall type furnace
  • (D)  water is converted into steam in one pass without any recirculation
  • (E)  water is heated in a large number of tubes
Submitted By :Ali Uppal

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