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Mechanical Engineering Mcqs

Boiler parameters are expressed by ___________________?

  • (A)  tonnes/hr. of steam
  • (B)  pressure of steam in kg/cm2
  • (C)  temperature of steam in °C
  • (D)  all of the above
  • (E)  none of the above
Submitted By :Ali Uppal

Calorific value of coal is of the order of _______________________?

  • (A)  200-400 kcal/kg
  • (B)  800-1200 kcal/kg
  • (C)  2000-4000 kcal/kg
  • (D)  5000-8000 kcal/kg
  • (E)  8000-10,000 kcal/kg
Submitted By :Ali Uppal

The condition of steam in boiler drum is always ___________________?

  • (A)  dry
  • (B)  wet
  • (C)  saturated
  • (D)  supersaturated
  • (E)  superheated
Submitted By :Ali Uppal

Which device is used in thermal power plants to reduce level of pollution___________________?

  • (A)  induced draft fan
  • (B)  smoke meter
  • (C)  chimney
  • (D)  precipitator
  • (E)  pulveriser
Submitted By :Ali Uppal

Spontaneous combustion is a phenomenon in which____________________?

  • (A)  all the fuel burns instantaneously producing high energy release
  • (B)  fuel burns with less air
  • (C)  coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
  • (D)  explosion in furnace
  • (E)  none of the above
Submitted By :Ali Uppal

An economiser in a boiler______________________?

  • (A)  increases steam pressure
  • (B)  increases steam flow
  • (C)  decreases fuel consumption
  • (D)  decreases steam pressure
  • (E)  increases life of boiler
Submitted By :Ali Uppal

Sulphur content of fuels is very important to the plant operators because it____________________?

  • (A)  has high heating value
  • (B)  retards electric precipitation
  • (C)  promotes complete combustion
  • (D)  has highly corrosive effect
  • (E)  facilitates ash removal
Submitted By :Ali Uppal

Gusset stays in a boiler are provided to____________________?

  • (A)  prevent the bulging of flat surfaces
  • (B)  avoid explosion in furnace
  • (C)  prevent leakage of hot flue gases
  • (D)  support furnace freely from top
  • (E)  prevent atmospheric air leaking into furnace
Submitted By :Ali Uppal

Pour point of fuel oil is the____________________?

  • (A)  lowest temperature at which oil will flow under set condition
  • (B)  storage temperature
  • (C)  temperature at which fuel is pumped through burners
  • (D)  temperature at which oil is transported
  • (E)  none of the above
Submitted By :Ali Uppal

The behaviour of coal in a furnace is determained by_______________________?

  • (A)  the content of sulphur
  • (B)  the content of ash and heating value
  • (C)  the proximate analysis
  • (D)  the exact analysis
  • (E)  its type
Submitted By :Ali Uppal

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