Steam Engines and Turbines Mechanical Engineering Questions - Set 29

Practice Test: Question Set - 29

1. The length of Cornish boiler is of the order of
    (A) 24 m
    (B) 35 m
    (C) 57.5 m
    (D) 79 m

2. The forced circulation of water does not take place in
    (A) LaMont boiler
    (B) Lancashire boiler
    (C) Velox boiler
    (D) Benson boiler

3. A fusible plug is fitted in small boilers in order to
    (A) Avoid excessive build up of pressure
    (B) Avoid explosion
    (C) Extinguish fire if water level in the boiler falls below alarming limit
    (D) Control steam dome

4. Which of the following statement is wrong?
    (A) The factor of evaporation for all boilers is always greater than unity
    (B) The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C
    (C) The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency
    (D) None of the above

5. Sulphur in coal results in
    (A) Corroding air heaters
    (B) Spontaneous combustion during coal storage
    (C) Facilitating ash precipitation
    (D) All of the above

6. Lancashire boiler has __________ internal flue tubes.
    (A) One
    (B) Two
    (C) Three
    (D) Four

7. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has
    (A) More heating surface
    (B) Less heating surface
    (C) Equal heating surface
    (D) Heating surface depends on other parameters

8. The amount of water evaporated in kg per kg of fuel burnt is called
    (A) Evaporative capacity of a boiler
    (B) Equivalent evaporation from and at 100° C
    (C) Boiler efficiency
    (D) None of these

9. Heating of dry steam above saturation temperature is known as
    (A) Enthalpy
    (B) Superheating
    (C) Super saturation
    (D) Latent heat

10. The function of a piston rod is
    (A) To guide motion of the piston rod and to prevent it from bending
    (B) To transfer motion from the piston to the cross head
    (C) To convert heat energy of the steam into mechanical work
    (D) To exhaust steam from the cylinder at proper moment

11. At which pressure the properties of water and steam become identical
    (A) 0.1 kg/cm²
    (B) 1 kg/cm²
    (C) 100 kg/cm²
    (D) 225.6 kg/cm²

12. The actual power supplied by the engine crankshaft is called
    (A) Indicated power
    (B) Brake power
    (C) Frictional power
    (D) None of these

13. The diameter of cylindrical shell of the Lancashire boiler is of the order of
    (A) 1 to 1.25 m
    (B) 1 to 1.75 m
    (C) 2 to 4 m
    (D) 1.75 to 2.75 m

14. The length of Lancashire boiler varies from
    (A) 5 to 6 m
    (B) 6 to 7 m
    (C) 7.25 to 9 m
    (D) 9 to 10 m

15. The radius of a dished head is taken approximately as
    (A) One fourth
    (B) Half
    (C) One
    (D) Two

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