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Mechanical Engineering Mcqs

Steam exhaust from high pressure turbine is reheated in _____________________?

  • (A)  boiler drum
  • (B)  superheater tubes
  • (C)  economiser
  • (D)  a separate coil
  • (E)  a separate coil located in convection path
Submitted By :Ali Uppal


The safety valve at superheater as compared to drum safety valve setting is set at___________________?

  • (A)  higher value
  • (B)  lower value
  • (C)  same value
  • (D)  any value
  • (E)  none of the above
Submitted By :Ali Uppal


The pressure of reheat steam after passing through reheater compared to inlet condition is _________________?

  • (A)  more
  • (B)  less
  • (C)  equal
  • (D)  may be more or less depending on capacity of reheater
  • (E)  none of the above
Submitted By :Ali Uppal


In regenerative air preheater, the heat is transferred _____________________?

  • (A)  from a metal wall from one medium to another
  • (B)  from heating an intermediateanaterial and then heating the air from this material
  • (C)  by direct mixing
  • (D)  heat is transferred by bleeding some gas from furnace
  • (E)  none of the above
Submitted By :Ali Uppal


A safety valve in a locomotive starts leaking. The leaking medium will be_________________?

  • (A)  water
  • (B)  dry steam
  • (C)  wet steam
  • (D)  super heated steam
  • (E)  supersaturated steam
Submitted By :Ali Uppal


The diameter of fire tubes in Cochran boiler is of the order of___________________?

  • (A)  2 cm
  • (B)  6 Cm ,
  • (C)  8 cm
  • (D)  12 cm
  • (E)  15 cm
Submitted By :Ali Uppal


Tertiary air is the air used to____________________?

  • (A)  provide air around burners for obtaining optimum combustion
  • (B)  transport and dry the coal
  • (C)  cool the scanners
  • (D)  supply air for ignitors
  • (E)  convert CO (formed in lower zone of furnace) into C02 at higher zone
Submitted By :Ali Uppal


The ultimate analysis of fuel lists _____________________?

  • (A)  various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
  • (B)  various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
  • (C)  fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
  • (D)  fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
  • (E)  moisture and ash free heating value
Submitted By :Ali Uppal


Caking coals are those which __________________________?

  • (A)  form lumps or masses of coke
  • (B)  burn freely
  • (C)  show little or no fusing action
  • (D)  burn completely
  • (E)  do not form ash
Submitted By :Ali Uppal


Secondary air is the used to_________________?

  • (A)  provide air around burners for obtaining optimum combustion
  • (B)  transport and dry the coal
  • (C)  convert CO (formed in lower zone of furnace) into C02 at higher zone
  • (D)  air delivered by induced draft fan
  • (E)  air fed to pulverisers
Submitted By :Ali Uppal