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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.Alkaline pyrogallate is used in Orsat's apparatus for absorption of
- ACO₂
- BCO
- CO₂
- DN₂
2.An economiser is installed in a boiler primarily to
- ASuperheat the steam
- BReduce fuel consumption
- CIncrease steam pressure
- DAll of these
3.The selection of type and size of a steam boiler depends upon
- AThe power required and working pressure
- BThe geographical position of the power house
- CThe fuel and water available
- DAll of the above
4.Which of the following are boiler accessories?
- AEconomizer
- BSuperheater
- CBoth (A) and (B)
- DNone of these
5.In designing air preheaters, the important design consideration is that
- AApproach temperature should be as low as possible
- BHandling and maintenance should be easier
- CHeat transfer area should be optimum
- DStack gases should not be cooled to the dew point
6.In locomotives, the draught is produced by
- AChimney
- BInduced draft fan
- CBoth combined (A) and (B)
- DSteam jet draught
7.Locomotive boiler is of the following type
- AMulti tubular
- BHorizontal
- CInternally fired
- DAll of the above
8.The diameter of flue tube in a Cornish boiler is _________ that of the shell.
- AOne-fourth
- BOne-third
- CTwo-fifth
- DThree-fifth
9.The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.
- AOne-fourth
- BOne-third
- CTwo-fifth
- DOne-half
10.The cylindrical shell of a Lancashire boiler has diameter from
- A1 to 2 m
- B1.25 to 2.25 m
- C1.5 to 2.5 m
- D1.75 to 2.75 m
11.When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a
- ASlow speed engine
- BMedium speed steam engine
- CHigh speed steam engine
- DNone of these
12.For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.
- AEqual to
- BTwice
- CThree times
- DFour times
13.Steam turbines are used for
- ALarge marine propulsion
- BElectric power generation
- CDirect drive of fans, compressors, pumps
- DAll of these
14.Which of the following varieties of coals is mostly used in steam boilers?
- ANon-coking bituminous coal
- BBrown coal
- CPeat
- DNone of the above
15.Presence of moisture in fuel oil would
- AKeep the burner tips cool
- BAid in proper combustion
- CBecause sputtering, possibly extinguishing flame
- DClean the nozzles
16.A fusible plug is fitted in small boilers in order to
- AAvoid excessive build up of pressure
- BAvoid explosion
- CExtinguish fire if water level in the boiler falls below alarming limit
- DControl steam dome
17.Lancashire boiler is of
- AStationary fire tube type
- BHorizontal type
- CNatural circulation type
- DAll of the above
18.100% efficiency of a thermal cycle cannot be achieved because of
- AFrictional losses
- BIt is not possible to achieve 0°K temperature
- CLeakage
- DNon availability of ideal substance
19.The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
- ALess
- BMore
- CEqual
- DMay be less or more depending on temperature
20.In water wall furnace, the heat is transferred to the water walls by
- AConvection
- BRadiation
- CConduction
- DRadiation and conduction