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Mechanical Engineering Mcqs

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?

  • (A)  more heating surface
  • (B)  less heating surface
  • (C)  equal heating surface
  • (D)  heating surface depends on other parameters
  • (E)  none of the above
Submitted By :Ali Uppal


The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

  • (A)  increases
  • (B)  decreases
  • (C)  remains unchanged
  • (D)  increases/decreases depending on steam temperature requirements
  • (E)  unpredictable
Submitted By :Ali Uppal


The basic job of feed water treatment in boilers is to overcome the problem of __________________?

  • (A)  corrosion
  • (B)  scale
  • (C)  carryover
  • (D)  embrittlement
  • (E)  all of the above
Submitted By :Ali Uppal


The feed check valve is used in order to ______________________?

  • (A)  regulate flow of boiler water
  • (B)  check level of water in boiler drum
  • (C)  recirculate unwanted feed water
  • (D)  allow high pressure feed water to flow to drum and not allow reverse flow to take place
  • (E)  none of the above
Submitted By :Ali Uppal


In water wall furnace, the heat is transferred to the water-walls by _________________?

  • (A)  convection
  • (B)  radiation
  • (C)  conduction
  • (D)  radiation and conducton
  • (E)  radiation and convection
Submitted By :Ali Uppal


The proximate 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


The safety valve on boiler drum compared to safety valve on super heater is set at ________________?

  • (A)  same value
  • (B)  higher value
  • (C)  lower value
  • (D)  lower/higher depending on steam flow
  • (E)  unpredicatble
Submitted By :Ali Uppal


The three “Ts” for good combustion are____________________?

  • (A)  temperature, time, and turbulance
  • (B)  total air, true fuel, and turbulance
  • (C)  thorough mixing, total air, and temperature
  • (D)  total air, time, and temperature
  • (E)  none of the above
Submitted By :Ali Uppal


Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?

  • (A)  higher effectiveness of boiler
  • (B)  high calorific value coal being burnt
  • (C)  fouling of heat transfer surfaces
  • (D)  raising of steam temperature
  • (E)  leakage of air
Submitted By :Ali Uppal


The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?

  • (A)  same
  • (B)  more
  • (C)  less
  • (D)  less or more depending on size of boiler
  • (E)  unpredictable
Submitted By :Ali Uppal