Multiple Choice Questions on Steam Nozzles and Turbines - Set 11

Practice Test: Question Set - 11

1. In recuperative air preheaters, the heat is transferred
    (A) From a metal wall from one medium to another
    (B) From heating an intermediate material and then heating the air from this material
    (C) By direct mixing
    (D) Heat is transferred by bleeding some gases from furnace

2. The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
    (A) Regenerative heating
    (B) Reheating of steam
    (C) Bleeding
    (D) None of these

3. Which of the following statement is wrong?
    (A) The mechanical draught reduces the height of chimney
    (B) The natural draught reduces the fuel consumption
    (C) A balanced draught is a combination of induced and forced draught
    (D) All of the above

4. 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

5. Stage efficiency is also known as
    (A) Diagram efficiency
    (B) Nozzle efficiency
    (C) Gross efficiency
    (D) None of these

6. A device used to heat feed water by utilizing the heat in me exhaust flue gases before leaving through the chimney, is known as
    (A) Economizer
    (B) Fusible plug
    (C) Superheater
    (D) Stop valve

7. Which is not correct statement about the function of furnace?
    (A) To provide proper conditions for continuous complete combustion
    (B) Mix fuel with air and ignite
    (C) Separate ash from coal
    (D) Maintain heat supply to prepare and ignite the incoming fuel

8. In a nozzle, whole frictional loss is assumed to occur between
    (A) Inlet and throat
    (B) Inlet and outlet
    (C) Throat and exit
    (D) All of these

9. The working pressure range for a LaMont boiler is
    (A) 0.5 to 10 MN/m²
    (B) 1 to 15 MN/m²
    (C) 2.5 to 15 MN/m²
    (D) 3.5 to 20 MN/m²

10. The basic job of feed water treatment in boilers is to overcome the problem of
    (A) Corrosion
    (B) Scale
    (C) Carryover
    (D) All of the above

11. In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be
    (A) 3.3 bar
    (B) 5.46 bar
    (C) 8.2 bar
    (D) 9.9 bar

12. In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to
    (A) Water space also
    (B) Chimney
    (C) Steam space
    (D) Superheater

13. At very low temperature, the melting and boiling temperatures become equal. This temperature is
    (A) 373°K
    (B) 273.16°K
    (C) 303°K
    (D) 0°K

14. The ratio of the useful heat drop to the isentropic heat drop is called
    (A) Condenser efficiency
    (B) Nozzle efficiency
    (C) Boiler efficiency
    (D) Vacuum efficiency

15. The fire tubes in a Scotch marine boiler are
    (A) Horizontal
    (B) Vertical
    (C) Inclined
    (D) None of these

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