Power Plant Engineering Set 3

0.5 to 0.6 ✘ 0.9 to 0.95 ✘ 1.02 to 1.06 ✘ 1.2 to 1.6 ✔

the ratio of outlet pressure to inlet pressure of nozzle ✘ the ratio of inlet pressure to outlet pressure of nozzle ✘ the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is min-imum ✘ the ratio of outlet pressure to inlet pressure only when mass flow rate = c ✔

mechanical ✘ chemical ✘ heat ✘ sound ✔

burn completely ✘ burn freely ✘ do not form ash ✘ form lumps or masses of coke ✔

to produce draught to accelerate the combustion of fuel ✘ to discharge gases high up in the atmosphere to avoid hazard ✘ to reduce the temperature of the hot gases discharged ✘ none of the above ✔

to maintain pressure below atmospheric to increase work output from the primemover ✘ to receive large volumes of steam exhausted from steam prime mover ✘ to condense large volumes of steam to water which may be used again in boiler ✘ all of the above ✔

less ✘ more ✘ same ✘ not predictable ✔

solar, wind and biomass ✘ fossil fuels, hydropower and nuclear energy ✘ wood, animal wastes and agriculture wastes ✘ none of the above ✔

pvls=C ✘ pv1126 = C ✘ pv1A = C ✘ pv = C ✔

pressure compounded steam turbine ✘ simple single wheel, impulse steam turbine ✘ simple single wheel reaction steam turbine ✘ multi wheel reaction steam turbine ✔