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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.The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
- ASafety valve
- BWater level indicator
- CPressure gauge
- DFusible plug
2.The condition of steam in boiler drum is always
- ADry
- BWet
- CSaturated
- DSupersaturated
3.In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is
- A0.007 bar
- B0.053 bar
- C0.06 bar
- D0.067 bar
4.The actual vacuum in a condenser is equal to
- ABarometric pressure + actual pressure
- BBarometric pressure - actual pressure
- CGauge pressure + atmospheric pressure
- DGauge pressure - atmospheric pressure
5.If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to
- Aps – pa
- Bpa – ps
- Cpa + ps
- DNone of these
6.Spontaneous combustion is a phenomenon in which
- AAll the fuel burns instantaneously producing high energy release
- BFuel burns with less air
- CCoal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
- DExplosion in furnace
7.In fire tube boilers
- AWater passes through the tubes which are surrounded by flames and hot gases
- BThe flames and hot gases pass through the tubes which are surrounded by water
- CForced circulation takes place
- DNone of these
8.Pick up the wrong statement about water tube boiler in comparison to fire tube boilers
- AFormer occupies less space for same power
- BRate of steam flow is more in former case
- CFormer is used for high installed capacity
- DChances of explosion are less in former case
9.Which of the following is a fire tube boiler?
- ALocomotive boiler
- BBabcock and Wilcox boiler
- CStirling boiler
- DAll of the above
10.Which of the following is a fire tube boiler?
- ALancashire boiler
- BBabcock and Wilcox boiler
- CYarrow boiler
- DNone of these
11.For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.
- AMore
- BLess
- CEqual
- DNone of these
12.A device used to increase the temperature of saturated steam without raising its pressure, is called
- ABlow off cock
- BFusible plug
- CSuperheater
- DStop valve
13.For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then
- Aα₁ = α₂ and β₁ = β₂
- Bα₁ = β₁ and α₂= β₂
- Cα₁ < β₁ and α₂ > β₂
- Dα₁ = β₂ and β₁ = α₂
14.Pick up wrong statement about desired properties of a good fuel
- AHigh calorific value
- BProduce minimum smoke and gases
- CEase in storing
- DHigh ignition point
15.Lancashire boiler has __________ internal flue tubes.
- AOne
- BTwo
- CThree
- DFour
16.The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
- ACondenser efficiency
- BVacuum efficiency
- CNozzle efficiency
- DBoiler efficiency
17.The maximum discharge through a chimney occurs when the height of chimney is
- AInfinitely long
- BAround 200 meters
- CEqual to the height of the hot gas column producing draught
- DOutside temperature is very low
18.The effect of friction on the flow of steam through a nozzle is to
- ADecrease the mass flow rate and to increase the wetness of steam
- BIncrease the mass flow rate and to increase the exit temperature
- CDecrease the mass flow rate and to decrease the wetness of steam
- DIncrease the exit temperature without any effect on mass flow rate
19.The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.
- AMore
- BLess
- CEqual
- DNone of thes
20.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
- AInduced steam jet draught
- BChimney draught
- CForced steam jet draught
- DNone of these