Power Plant Engineering Set 1

improves in summer as compared to that in winter ✘ improves in winter as compared to that in summer ✘ is unaffected by climatic conditions ✘ none of the above ✔

less smoke ✘ more draught ✘ less chimney gas temperature ✘ all of the above ✔

due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in ✘ due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column ✘ due to the fact that at the chimney top the pressure is more than its environmental pressure ✘ all of the above ✔

when steam is extracted from only one suitable point of steam turbine ✘ when steam is extracted from several places in different stages of steam turbine ✘ when steam is extracted only from the last stage of steam turbine ✘ when steam is extracted only from the first stage of steam turbine ✔

cooling water passes through tubes and steam surrounds them ✘ steam passes through tubes and cooling water surrounds them ✘ steam and cooling water mix ✘ steam and cooling water do not mix ✔

the pressure in the turbine rotor is approximately same as in condenser ✘ the pressure in the turbine rotor is higher than pressure in the condenser ✘ the pressure in the turbine rotor gradually decreases from inlet to exit from condenser ✘ none from the above ✔

decreases if the chimney gas temperature increases ✘ increases if the chimney gas temperature increases ✘ remains same irrespective of chimney gas temperature ✘ may increase or decrease ✔

unit ✘ central ✘ power ✘ none of the above ✔

reducing the work done ✘ increasing the rotor speed ✘ reducing the rotor speed ✘ balancing the turbine ✔

change of internal energy between inlet and outlet ✘ change of enthaply between inlet and outlet ✘ change of entropy between inlet and outlet ✘ change of temperature between inlet and outlet ✔