200 Important Electrical Power Generation MCQ Question and Answer | PDF Free Download
1.The efficiency of a boiler used in a modern steam power plant is of the order of
- A30%
- B50%
- C85%
- D100%
2.In a boiler, the carryover of water into the piping because of dirty water is called the
- AFoaming
- BPitting
- CScalping
- DBeating
3.The boilers using lignite as fuel do not use
- ASpreader stoker
- BTravelling grate stoker
- CUnderfeed stoker
- DAll of the above
4.Pipes carrying steam are generally made of
- ASteel
- BCast iron
- CAluminium
- DCobalt
5.For given power a water tube boiler occupies
- ALess floor area and less height
- BMore floor area and less height
- CLess floor area and More height
- DMore floor area and More height than a fire tube boiler
6.The selection of the type and size of a steam boiler depends upon
- AThe power required and working pressure
- BThe geographical position of the powerhouse
- CThe fuel and water availability
- DAll of the above factors
7.In a superheater
- APressure rises and temperature drops
- BTemperature rises and Pressure drops
- CTemperature rises and Pressure remains unchanged
- DPressure rises and temperature remains the same
8.Within the boiler, the temperature of steam is highest in
- ASuper heater
- BWater tubes
- CWater walls
- DEater drum
9.Which of the following enters to the super heater of a boiler?
- ASuperheated steam
- BWet steam
- CHot steam
- DCold water
10.Superheated steam is always
- AAt a pressure more than that of the boiler steam
- BAt a pressure lower than the maximum cycle pressure
- CAt a temperature higher than the temperature of saturation corresponding to the steam pressure
- DNone of the above
11.Steam is superheated in order to
- AImprove Rankine cycle efficiency
- BReduce initial condensation losses
- CAvoid too high temperature in the last stage of the turbine
- DAll of the above
12.The function of economizer in a steam power plant is to
- AHeat up the incoming water with exhaust steam
- BHeat up the pulverised fuel by exhaust gases
- CHeat up the incoming air by exhaust gases
- DHeat up the incoming water by exhaust gases
13.In a steam power plant heat from the flue gases is recovered in
- AA condenser
- BA chimney
- CEconomiser and air preheater
- DA desuperheater
14.Economiser in a steam power plant
- AImproves the boiler efficiency by 10 ? 12%
- BSaves fuel consumption by 5 ? 15%
- CBecomes a necessity for pressure exceeding 70 kg/cm2
- DAll of the above
15.The advantage of reheating of steam in a turbine is that
- AIt increases the efficiency of the turbine
- BIt reduces the wears on the blades
- CIt increases the work-done through the turbine
- DAll of the above advantages
16.Air preheater in a steam power plant
- ARecovers the heat from the flue gases leaving the economiser
- BImproves combustion rate
- CRaises the temperature of the furnace gases
- DRaises the temperature of the furnace gases
17.Condensers in thermal power plants are for condensing
- ASteam to water
- BWater to ice
- CHydrogen gas to liquid gas
- DCarbon dioxide to dry ice
18.A condenser in a steam power plant condenses steam coming out of
- ATurbine
- BBoiler
- CEconomiser
- DSuperheater
19.n a steam power plant water is used for cooling purposes in
- AEconomiser
- BCondenser
- CSuperheater
- DElectrostatic
20.In a steam turbine cycle, the lowest pressure occurs in
- ACondenser
- BTurbine inlet
- CBoiler
- DSuperheater