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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.A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
- ABlow off cock
- BFusible plug
- CStop valve
- DSafety valve
2.Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
- AHigher effectiveness of boiler
- BHigh calorific value coal being burnt
- CFouling of heat transfer surfaces
- DRaising of steam temperature
3.The mechanical draught _________ with the amount of smoke.
- AIncreases
- BDecreases
- CDoes not effect
- DNone of these
4.In a uniflow engine
- ASteam enters and exhausts through the same port
- BSteam enters at one end and exhausts at the centre
- CSteam enters at the centre and exhausts at the other end
- DNone of the above
5.The expansion of steam in a nozzle follows
- ACarnot cycle
- BRankine cycle
- CJoule cycle
- DStirling cycle
6.The compounding of turbines is done in order to
- AReduce speed of rotor
- BImprove efficiency
- CReduce exit losses
- DAll of these
7.A nozzle is said to be a divergent nozzle
- AWhen the cross-section of the nozzle increases continuously from entrance to exit
- BWhen the cross-section of the nozzle decreases continuously from entrance to exit
- CWhen the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
- DNone of the above
8.Which of the following boiler is best suited to meet the fluctuating demand of steam?
- ALocomotive boiler
- BLancashire boiler
- CCornish boiler
- DBabcock and Wilcox boiler
9.Which type of boiler can meet rapid changes of load?
- AVertical fire tube type
- BHorizontal fire tube type
- CHorizontal water tube type
- DForced circulation type
10.Which of the following coals has the highest calorific value?
- AAnthracite coal
- BBituminous coal
- CLignite
- DPeat
11.The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks
- A180° to each other
- B90° to each other
- C0° to each other
- DNone of these
12.The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks
- A180° to each other
- B90° to each other
- C0° to each other
- DNone of these
13.The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks
- A180° to each other
- B90° to each other
- C0° to each other
- DNone of these
14.Boiler parameters are expressed by
- ATonnes/hr. of steam
- BPressure of steam in kg/cm²
- CTemperature of steam in °C
- DAll of the above
15.The radius of a dished head is taken approximately as
- AOne fourth
- BHalf
- COne
- DTwo
16.A supercritical boiler is one that operates above the pressure and temperature of following values
- A100 kg/cm² and 540°C
- B1 kg/cm² and 100°C
- C218 kg/cm² abs and 373°C
- D218 kg/cm² abs and 540°C
17.Thermal equilibrium means that the flow of steam is
- AIsothermal
- BIsentropic
- CHyperbolic
- DPolytropic
18.Steam in water tube boiler as compared to fire tube boiler
- ACan be raised rapidly
- BIs raised at slower rate
- CIs raised at same rate
- DCould be raised at fast/slow rate depending on design
19.The function of an eccentric rod is
- ATo provide reciprocating motion to the slide valve
- BTo convert reciprocating motion of the piston into rotary motion of the crank
- CTo convert rotary motion of the crankshaft into to and fro motion of the valve rod
- DTo provide simple harmonic motion to the D-slide valve
20.The rate of steam produced in Benson boiler is
- A100 tonnes/h
- B135 tonnes/h
- C175 tonnes/h
- D250 tonnes/h