Multiple Choice Questions on Steam Boilers and Engines - Set 16 - ObjectiveBooks

# Practice Test: Question Set - 16

1. The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called
(A) Natural draught
(B) Induced draught
(C) Forced draught
(D) Balanced draught

2. The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become
(A) Wet
(B) Superheated
(C) Remain dry saturated
(D) Dry

3. The nozzle efficiency is the ratio of
(A) Workdone on the blades to the energy supplied to the blades
(B) Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
(C) Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
(D) None of the above

4. All steam engines work on
(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) None of these

5. The increase in pressure
(A) Lowers the boiling point of a liquid
(B) Raises the boiling point of a liquid
(C) Does not affects the boiling point of a liquid
(D) Reduces its volume

6. If the critical pressure ratio for steam is 0.546, then the steam is initially
(A) Wet steam
(B) Dry saturated steam
(C) Superheated steam
(D) None of these

7. The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.
(A) 0°C
(B) 40°C
(C) 60°C
(D) 100°C

8. The high pressure boiler is one, which produces steam at a pressure more than
(A) Atmospheric pressure
(B) 5 kg/cm²
(C) 10 kg/cm²
(D) 7580 kg/cm²

9. The critical pressure ratio for gases is
(A) 0.528
(B) 0.546
(C) 0.577
(D) 0.582

10. Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)
(A) pa = pm/K
(B) pa = pm × K
(C) pa = K/pm
(D) pa = pm + K

11. A stage, in reaction turbine, is represented by
(A) Number of casing
(B) Number of entries of steam
(C) Number of exits of steam

12. In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
(A) 10 atmospheres
(B) 20 atmospheres
(C) 30 atmospheres
(D) 40 atmospheres

13. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is
(A) More
(B) Less
(C) Same
(D) Could be more or less depending on other factors

14. When the inlet pressure of steam is equal to the exit pressure, then
(A) There is a pressure drop in the nozzle
(B) Fluid flows through the nozzle
(C) Pressure drops and fluid flows through the nozzle
(D) There is no pressure drop and fluid does not flow through the nozzle

15. In water tube boilers
(A) Water passes through the tubes which are surrounded by flames and hot gases
(B) The flames and hot gases pass through the tubes which are surrounded by water
(C) Forced circulation takes place
(D) None of these

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