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Mechanical Engineering Mcqs

Boiler stays are used to___________________?

  • (A)  prevent flat surfaces under pressure from tearing apart
  • (B)  take care of failure in shear
  • (C)  take care of failure in compression
  • (D)  provide support for boiler
  • (E)  provide foundation of boiler
Submitted By :Ali Uppal

Which type of boiler can meet rapid changes of load____________________?

  • (A)  vertical fire tube type
  • (B)  horizontal fire tube type
  • (C)  horizontal water tube type
  • (D)  vertical water tube type
  • (E)  forced circulation type
Submitted By :Ali Uppal

It is required to produce large amount of steam at low pressure. Which boiler should be used ?

  • (A)  pulverised fuel fired boiler
  • (B)  cochran boiler
  • (C)  lancashire boiler
  • (D)  babcock and wilcox boiler
  • (E)  stoker fired boiler
Submitted By :Ali Uppal

Steam in water tube boiler as compared to fire tube boiler_________________?

  • (A)  can be raised rapidly
  • (B)  is raisd at slower rate
  • (C)  is raised at same rate
  • (D)  could be raised at fast/slow rate depending on design
  • (E)  none of the above is true
Submitted By :Ali Uppal

In forced recirculation 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)  heating of water takes place in stages
Submitted By :Ali Uppal

Fusible plug for boilers is made of fusible metal containing tin, lead, and___________________?

  • (A)  bismuth
  • (B)  copper
  • (C)  aluminium
  • (D)  nickel
  • (E)  iron
Submitted By :Ali Uppal

Bomb calorimeter is used to determine ___________________?

  • (A)  Higher calorific value at constant volume
  • (B)  Lower calorific value at constant volume ,
  • (C)  Higher calorific value at constant pressure
  • (D)  Lower calorific value at constant pressure
  • (E)  None of the above
Submitted By :Ali Uppal

Proximate analysis of fuel is determination of percentage of ____________________?

  • (A)  carbon, hydrogen, nitrogen, sulphur, moisture
  • (B)  fixed carbon, ash, volatile matter, moisture
  • (C)  higher calorific value
  • (D)  lower calorific value
  • (E)  rough analysis
Submitted By :Ali Uppal

Reheating of steam under ideal conditions takes place at constant __________________?

  • (A)  entropy
  • (B)  enthaply
  • (C)  pressure
  • (D)  temperature
  • (E)  all of the above
Submitted By :Ali Uppal

Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?

  • (A)  desirable
  • (B)  economical
  • (C)  essential
  • (D)  optional
  • (E)  uneconomical
Submitted By :Ali Uppal

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