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Steam Boilers, Engines, Nozzles And Turbines MCQ
480 Important Steam Boilers, Engines, Nozzles And Turbines MCQ Question and Answer | PDF Free Download
1.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
- DNone of these
2.By compounding the expansion of steam in two or more cylinders, the ratio of expansion
- ADoes not change
- BIncreases
- CDecreases
- DNone of these
3.The critical pressure ratio for gases is
- A0.528
- B0.546
- C0.577
- D0.582
4.The efficiency of the plant __________ with the mechanical draught.
- AIncreases
- BDecreases
- CRemains constant
- DNone of these
5.The heat loss in a boiler takes place in the form of
- AHeat carried away by flue gases
- BHeat carried away by ash
- CMoisture present in fuel and steam formed by combustion of hydrogen in fuel
- DAll of the above
6.Lancashire boiler is
- AStationary fire tube boiler
- BInternally fired boiler
- CHorizontal boiler
- DAll of these
7.The number of flue tubes in Lancashire boiler is
- AZero
- BOne
- CTwo
- DFour
8.The bituminous coal is no caking if its carbon content is
- A78-81%
- B81-85%
- C85-90%
- D90-95%
9.The chimney draught varies with
- AClimatic conditions
- BTemperature of furnace gases
- CHeight of chimney
- DAll of these
10.Heating of dry steam above saturation temperature is known as
- AEnthalpy
- BSuperheating
- CSuper saturation
- DLatent heat
11.The critical pressure ratio for initially dry saturated steam is
- A0.546
- B0.577
- C0.582
- D0.601
12.In forced circulation type boiler
- AHeating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
- BWater is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
- CFeed pump is employed to supplement natural circulation in water wall type furnace
- DWater is converted into steam in one pass without any recirculation
13.In accelerated circulation type boiler
- AHeating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
- BWater is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
- CFeed pump is employed to supplement natural circulation in water wall type furnace
- DWater is converted into steam in one pass without any recirculation
14.Which of the following is required for a steam condensing plant?
- ACondenser
- BCondensate pump
- CAir extraction pump
- DAll of these
15.An economiser _________ the steam raising capacity of a boiler.
- AIncreases
- BDecreases
- CHas no effect on
- DNone of these
16.Cochran boiler is a
- AHorizontal fire tube boiler
- BHorizontal water tube boiler
- CVertical water tube boiler
- DVertical fire tube boiler
17.The draught produced by a steam jet issuing from a nozzle placed in the chimney is called
- AInduced steam jet draught
- BChimney draught
- CForced steam jet draught
- DNone of these
18.The velocity of whirl at outlet for an axial discharge turbine is
- AMinimum
- BMaximum
- CZero
- DNone of these
19.The clearance in the engine cylinder
- AIncreases the mean effective pressure
- BIncreases the workdone
- CDecreases the efficiency of the engine
- DAll of these
20.The theoretical indicator diagram of a simple steam engine is based upon the assumption that
- AThere is no pressure drop due to condensation
- BSteam is admitted at boiler pressure and exhausted at condenser pressure
- CThe expansion (or compression) of the steam is hyperbolic
- DAll of the above