Mechanical Engineering MCQs

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 mositure, volatile, fixed carbon and ash
D. Fuel constituents as percents by weight of mositure, volatile, fixed carbon and ash

A. Same value
B. Higher value
C. Lower value
D. Lower/higher depending on steam flow

A. Higher effectiveness of boiler
B. High calorific value coal being burnt
C. Fouling of heat transfer surfaces
D. Raising of steam temperature

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

A. Reduce hardness and for removal of solids
B. Increase efficiency-of thermal power plant
C. Increase *heat transfer rate
D. Increase steam parameters

A. Same
B. More
C. Less
D. Less or more depending on size of boiler

A. 200-400 kcal/kg
B. 800-1200 kcal/kg
C. 2000-4000 kcal/kg
D. 5000-8000 kcal/kg

A. Tonnes/hr. of steam
B. Pressure of steam in kg/cm2
C. Temperature of steam in °c
D. All of the above

A. Dry
B. Wet
C. Saturated
D. Supersaturated

A. Supply of excess, air
B. Supply of excess coal
C. Burning co and unburnts in upper zone of furnace by supplying more air
D. Fuel bed firing