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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 pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as
- AFeed pump
- BInjector
- CFeed check valve
- DPressure gauge
2.The main object of a boiler trial is
- ATo determine the generating capacity of the boiler
- BTo determine the thermal efficiency of the boiler when working at a definite pressure
- CTo prepare heat balance sheet for the boiler
- DAll of the above
3.An air preheater is installed
- ABefore the economizer
- BBefore the superheater
- CBetween the economiser and chimney
- DNone of these
4.The ratio of the workdone on the blades to the energy supplied to the blades, is called
- ABlading efficiency
- BNozzle efficiency
- CGross or stage efficiency
- DMechanical efficiency
5.Green coal, in order to be burnt, must be
- AHeated sufficiently
- BBurnt in excess air
- CHeated to its ignition point
- DBurnt as powder
6.Incomplete combustion can be best judged by
- ASmoky chimney exit
- BExcess air in flue gases
- CMeasuring carbon monoxide in flue gases
- DMeasuring temperature of flue gases at exit of furnace
7.The efficiency of steam turbines may be improved by
- AReheating of steam
- BRegenerative feed heating
- CBinary vapor plant
- DAny one of these
8.De-Laval turbine is a
- ASimple impulse turbine
- BSimple reaction turbine
- CImpulse-reaction turbine
- DNone of these
9.The biggest size of thermal power unit operating in India is
- A30 MW
- B60 MW
- C100 MW
- D500 MW
10.A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are
- ASupplied by same manufacturer loose and assembled at site
- BSupplied mounted on a single base
- CPurchased from several parties and packed together at site
- DPackaged boiler does not exist
11.In water 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
12.Which of the following is a water tube boiler?
- ALocomotive boiler
- BCochran boiler
- CCornish boiler
- DBabcock and Wilcox boiler
13.Which of the following is a water tube boiler?
- ALancashire boiler
- BBabcock and Wilcox boiler
- CLocomotive boiler
- DCochran boiler
14.Water and sediment in fuel oil can be removed by
- AHeating the oil in the settling tanks
- BCooling the oil in the settling tanks
- CBurning the oil
- DSuspension
15.While steam expands in turbines, theoretically the entropy
- ARemains constant
- BIncreases
- CDecreases
- DBehaves unpredictably
16.Film boiling occurs at
- AVery low pressure
- BAtmospheric pressures
- CMedium pressures
- DVery high pressures
17.The factor of evaporation for all boilers is always
- AEqual to unity
- BLess than unity
- CGreater than unity
- DNone of these
18.Blow off cock in a boiler is used to
- AControl the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
- BEmpty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
- CPut off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
- DIncrease the temperature of saturated steam without raising its pressure
19.The steam temperature with increase in load in case of a boiler fitted with radiation superheater
- AIncreases
- BDecreases
- CRemain unaffected
- DFirst increases and then decreases
20.The effect of super-saturation is that the
- AMass of the steam discharged increases
- BEntropy and specific volume of the steam increases
- CExit velocity of steam reduces
- DAll of these