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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 feed check valve is used in order to
- ARegulate flow of boiler water
- BCheck level of water in boiler drum
- CRecirculate unwanted feed water
- DAllow high pressure feed water to flow to drum and not allow reverse flow to take place
2.Fire tube boilers are
- AInternally fired
- BExternally fired
- CInternally as well as externally fired
- DNone of these
3.Besides mean effective pressure, the data required to determine the indicated power of an engine include
- APiston diameter, length of stroke and calorific value of fuel
- BPiston diameter, specific fuel consumption and Calorific value of fuel
- CPiston diameter, length of stroke and speed of rotation
- DSpecific fuel consumption, speed of rotation and torque
4.An air preheater
- AIncreases evaporative capacity of the boiler
- BIncreases the efficiency of the boiler
- CEnables low grade fuel to be burnt
- DAll of the above
5.The purpose of governing in steam turbines is to
- AMaintain the speed of the turbine
- BReduce the effective heat drop
- CReheat the steam and improve its quality
- DCompletely balance against end thrust
6.The critical pressure ratio for initially wet steam is
- A0.546
- B0.577
- C0.582
- D0.601
7.Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
- A421 kg.m
- B421 kg.m
- C539 kg.m
- D102 kg.m
8.The critical pressure ratio (p₂/p₁) is given by
- A(p₂/p₁) = [2/(n - 1)] n/(n + 1)
- B(p₂/p₁) = [2/(n + 1)] n/(n-1)
- C(p₂/p₁) = [(n - 1)/2] n + (1/n)
- D(p₂/p₁) = [(n + 1)/2] n - (1/n)
9.Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)
- Apa = pm/K
- Bpa = pm × K
- Cpa = K/pm
- Dpa = pm + K
10.The fire tubes in a Locomotive boiler has __________ diameter.
- A4.75 mm
- B5.47 mm
- C7.45 mm
- D47.5 mm
11.The fire tubes in a Cochran boiler usually have _________ diameter.
- A6.25 mm
- B62.5 mm
- C72.5 mm
- D92.5 mm
12.The number of water level indicators in a boiler are generally __________ in number.
- AOne
- BTwo
- CThree
- DFour
13.In regenerative air preheaters, the heat is transferred
- AFrom a metal wall from one medium to another
- BFrom heating an intermediate material and then heating the air from this material
- CBy direct mixing
- DHeat is transferred by bleeding some gas from furnace
14.In recuperative air preheaters, the heat is transferred
- AFrom a metal wall from one medium to another
- BFrom heating an intermediate material and then heating the air from this material
- CBy direct mixing
- DHeat is transferred by bleeding some gases from furnace
15.The ratio of the useful heat drop to the isentropic heat drop is called
- ACondenser efficiency
- BNozzle efficiency
- CBoiler efficiency
- DVacuum efficiency
16.Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?
- ACornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler
- BCornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler
- CCornish boiler has one flue tube whereas Lancashire boiler has two flue tubes
- DCornish boiler has two flue tubes whereas Lancashire boiler has one flue tube
17.The capacity of induced draft fan compared to forced draft fan in a boiler is
- ASame
- BMore
- CLess
- DLess or more depending on size of boiler
18.Adiabatic process is
- AEssentially an isentropic process
- BNon-heat transfer process
- CReversible process
- DConstant temperature process
19.The function of a piston in a steam engine is
- ATo guide motion of the piston rod and to prevent it from bending
- BTo transfer motion from the piston to the cross-head
- CTo convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
- DNone of these
20.The function of a safety valve is
- ATo blow off steam when the pressure of steam inside the boiler exceeds the working pressure
- BTo indicate the water level inside the boiler to an observer
- CTo measure pressure of steam inside the steam boiler
- DNone of the above