Steam Boilers and Engines Mechanical Engineering Questions - Set 30

Practice Test: Question Set - 30


1. Fire tube boilers are
    (A) Internally fired
    (B) Externally fired
    (C) Internally as well as externally fired
    (D) None of these

2. Bomb calorimeter is used to determine
    (A) Higher calorific value at constant volume
    (B) Lower calorific value at constant volume
    (C) Higher calorific value at constant pressure
    (D) Lower calorific value at constant pressure

3. The clearance in the engine cylinder
    (A) Increases the mean effective pressure
    (B) Increases the workdone
    (C) Decreases the efficiency of the engine
    (D) All of these

4. Over fire burning is the phenomenon of
    (A) Supply of excess, air
    (B) Supply of excess coal
    (C) Burning CO and unburnt in upper zone of furnace by supplying more air
    (D) Fuel bed firing

5. The length of Cornish boiler varies from
    (A) 2 to 4.5 m
    (B) 3 to 5 m
    (C) 5 to 7.5 m
    (D) 7 to 9 m

6. Hard coke is produced by carburization of coal at
    (A) Atmospheric temperature
    (B) 500-600°C
    (C) 700-850°C
    (D) 950-1100°C

7. The water tubes in a simple vertical boiler are
    (A) Horizontal
    (B) Vertical
    (C) Inclined
    (D) None of these

8. The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become
    (A) Wet
    (B) Superheated
    (C) Remain dry saturated
    (D) Dry

9. Which of the following statement is correct?
    (A) Lancashire boiler is a fire tube boiler
    (B) Fire tube boilers are internally fired
    (C) Babcock and Wilcox boiler is a water tube boiler
    (D) All of the above

10. The best suited coal for chain or traveling grate stoker boiler is
    (A) Coking coal
    (B) Non-coking or free burning coal
    (C) Pulverized coal
    (D) High sulphur coal

11. The mechanical draught _________ with the amount of smoke.
    (A) Increases
    (B) Decreases
    (C) Does not effect
    (D) None of these

12. O₂ content in atmospheric air on volume basis is
    (A) 21 %
    (B) 23 %
    (C) 30 %
    (D) 40 %

13. The natural draught is produced by
    (A) Steam jet
    (B) Centrifugal fan
    (C) Chimney
    (D) Both (A) and (B)

14. Boiler parameters are expressed by
    (A) Tonnes/hr. of steam
    (B) Pressure of steam in kg/cm²
    (C) Temperature of steam in °C
    (D) All of the above

15. In forced circulation steam boilers, the force is applied
    (A) To draw water
    (B) To circulate water
    (C) To drain off the water
    (D) All of these

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