Steam Boilers and Turbines Mechanical Engineering Questions - Set 28 - ObjectiveBooks

# Practice Test: Question Set - 28

1. A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as
(A) Superheater
(B) Air-preheater
(C) Economizer
(D) Injector

2. The specific volume of steam with increase in pressure decreases
(A) Linearly
(B) Slowly first and then rapidly
(C) Rapidly first and then slowly
(D) Inversely

3. When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by
(A) (h - hf1)/2257
(B) (h + hf1)/2257
(C) (h × hf1)/2257
(D) None of these

4. The evaporation of 15.653 kg of water per hour from and at 100°C is called
(A) Evaporative capacity
(B) Factor of evaporation
(C) Equivalent evaporation
(D) One boiler h.p.

5. Which of the following are boiler accessories?
(A) Economizer
(B) Superheater
(C) Both (A) and (B)
(D) None of these

6. Lancashire boiler is of
(A) Stationary < fire tube type
(B) Horizontal type
(C) Natural circulation type
(D) All of the above

7. The actual power generated in the engine cylinder is called
(A) Indicated power
(B) Brake power
(C) Frictional power
(D) None of these

8. In regenerative 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 gas from furnace

9. In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure.
(A) Equal to
(B) Lower than
(C) Higher than
(D) None of these

10. Alkaline pyrogallate is used in Orsat's apparatus for absorption of
(A) CO₂
(B) CO
(C) O₂
(D) N₂

11. The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called
(A) Induced steam jet draught
(B) Chimney draught
(C) Forced steam jet draught
(D) None of these

12. Equivalent evaporation is the amount of water evaporated in a boiler from and at
(A) 0°C
(B) 100°C
(C) Saturation temperature at given pressure
(D) Room temperature

13. The diameter of Cornish boiler varies from
(A) 0.5 to 1 m
(B) 1 to 2 m
(C) 1.25 to 2.5 m
(D) 2 to 3 m

14. In a throttling process
(A) Heat transfer takes place
(B) Work is done by the expanding steam
(C) Internal energy of steam changes
(D) None of the above

15. A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as
(A) Blow off cock
(B) Fusible plug
(C) Superheater
(D) Stop valve

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