Steam Nozzles and Engines Mechanical Engineering Questions - Set 31

Practice Test: Question Set - 31

1. The coal requirement per kW hour generation in the thermal power plant is of the order of
    (A) 0.1 to 0.2 kg
    (B) 0.2 to 0.4 kg
    (C) 0.6 to 0.8 kg
    (D) 1.0 to 1.5 kg
2. The diameter of flue tube in a Cornish boiler is _________ that of the shell.
    (A) One-fourth
    (B) One-third
    (C) Two-fifth
    (D) Three-fifth
3. During polytropic process
    (A) Heat transfer takes place across cylinder walls
    (B) Work is done
    (C) Steam may be wet, dry or superheated after expansion
    (D) All of the above
4. The ratio of the clearance volume to the swept volume is called
    (A) Cut-off ratio
    (B) Expansion ratio
    (C) Clearance ratio
    (D) None of these
5. The fusible plug in small boilers is located
    (A) In the drum
    (B) In the fire tubes
    (C) Above steam dome
    (D) Over the combustion chamber
6. The rate of steam produced in Benson boiler is
    (A) 100 tonnes/h
    (B) 135 tonnes/h
    (C) 175 tonnes/h
    (D) 250 tonnes/h
7. Incomplete combustion can be best judged by
    (A) Smoky chimney exit
    (B) Excess air in flue gases
    (C) Measuring carbon monoxide in flue gases
    (D) Measuring temperature of flue gases at exit of furnace
8. Which of the following boiler works on a forced circulation of water?
    (A) Lamont boiler
    (B) Benson boiler
    (C) Loeffler boiler
    (D) All of these
9. Hygrometry deals with the
    (A) Hygroscopic substances
    (B) Water vapor in air
    (C) Temperature of air
    (D) Pressure of air
10. The length of shell of a Locomotive boiler is
    (A) 1 m
    (B) 2 m
    (C) 3 m
    (D) 4 m
11. The number of drums in Benson steam generator is
    (A) One
    (B) Two
    (C) One steam drum and one water drum
    (D) No drum
12. The chimney draught varies with
    (A) Climatic conditions
    (B) Temperature of furnace gases
    (C) Height of chimney
    (D) All of these
13. Pick up wrong statement about desired properties of a good fuel
    (A) High calorific value
    (B) Produce minimum smoke and gases
    (C) Ease in storing
    (D) High ignition point
14. Benson boiler requires
    (A) No drum
    (B) One drum
    (C) Two drums
    (D) Three drums
15. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) First increases and then decreases
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