McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 201. |
Why are salts deposited on the evaporator drum? |
| A. | due to continuous circulation of water |
| B. | due to usage of hard water containing calcium content |
| C. | due to circulation of impure water |
| D. | due to the chemicals added in water |
| Answer» C. due to circulation of impure water | |
| 202. |
What is feature of the Loffler boilers? |
| A. | evaporating water by super heated steam |
| B. | provide better efficiency by re-circulating gas coming out of turbine |
| C. | produce better steam quality by heating the boiler furnace above critical degrees |
| D. | eliminate the extra components used |
| Answer» A. evaporating water by super heated steam | |
| 203. |
What is the major difficulty of the La-Mont boiler? |
| A. | unstable water circulation |
| B. | deposition of salts |
| C. | overheating of the components |
| D. | boiler working is slow |
| Answer» B. deposition of salts | |
| 204. |
Which is the most recent economical method of power generation from boilers? |
| A. | natural circulation boiler |
| B. | fire tube boiler |
| C. | forced circulation |
| D. | super critical boiler |
| Answer» D. super critical boiler | |
| 205. |
Which of the following boilers has the highest heat transfer capacity? |
| A. | subcritical boiler |
| B. | critical boiler |
| C. | forced circulation boiler |
| D. | supercritical boiler |
| Answer» D. supercritical boiler | |
| 206. |
Why boiler draught is most essential part of the thermal plants? |
| A. | serves combustion by supplying ample amount of air |
| B. | helps in maintaining air ventilation |
| C. | required to maintain constant air flow |
| D. | stabilizes the boiler system |
| Answer» C. required to maintain constant air flow | |
| 207. |
Which is the correct formula of total draught loss? |
| A. | ht = hv + hb + hc + hcd |
| B. | ht = hv + hb – hc + hcd |
| C. | ht = hv – hb + hc + hcd |
| D. | ht = hv – hb – hc – hcd |
| Answer» A. ht = hv + hb + hc + hcd | |
| 208. |
By what is natural draught produced? |
| A. | air duct |
| B. | chimney |
| C. | locomotive exhaust |
| D. | air blower |
| Answer» B. chimney | |
| 209. |
Which of the following given below as the affect on amount natural draught? |
| A. | boiler operation |
| B. | size of the furnace |
| C. | grade of the fuel |
| D. | dust content in the fuel is used |
| Answer» A. boiler operation | |
| 210. |
When is artificial draught preferred? |
| A. | when quick evacuation of flue gases is required |
| B. | when we choose large power plant systems |
| C. | when draught produced by chimney is not sufficient |
| D. | when there are many components inside the boiler |
| Answer» C. when draught produced by chimney is not sufficient | |
| 211. |
Artificial draught is also called as _______ |
| A. | force draught |
| B. | induced draught |
| C. | balanced draught |
| D. | mechanical draught |
| Answer» D. mechanical draught | |
| 212. |
What is installed to transfer air into furnace in forced draught system? |
| A. | air blower |
| B. | tuyeres |
| C. | draft gauges |
| D. | cyclone separator |
| Answer» A. air blower | |
| 213. |
Where is blower installed in induced draught system? |
| A. | near the boiler |
| B. | base of the chimney |
| C. | above the boiler |
| D. | between economizer and air preheater |
| Answer» B. base of the chimney | |
| 214. |
How can exhaust gas be recovered in the induced draught? |
| A. | by installing the forced draught fan at the starting point |
| B. | by extending the chimney’s height |
| C. | by inletting high amount of air from multiple air ducts |
| D. | by installing air preheater and economizer along the gas path |
| Answer» D. by installing air preheater and economizer along the gas path | |
| 215. |
Which is most preferred type of draught system? |
| A. | chimney draught |
| B. | fan draught |
| C. | force draught |
| D. | balanced draught |
| Answer» D. balanced draught | |
| 216. |
Which type of draught system is used in the locomotives? |
| A. | natural draught system |
| B. | balanced draught system |
| C. | forced draught system |
| D. | induced steam draught system |
| Answer» D. induced steam draught system | |
| 217. |
Which draught system is also known as turbine draught? |
| A. | forced steam draught |
| B. | induced steam draught |
| C. | natural draught |
| D. | fan draught |
| Answer» A. forced steam draught | |
| 218. |
Which draught system is used as conjunction with chimney draught? |
| A. | forced steam draught |
| B. | forced draught |
| C. | induced draught |
| D. | balanced draught |
| Answer» A. forced steam draught | |
| 219. |
There are two types of water feeding in a boiler, they are ________ and _________ |
| A. | open feed system and closed feed system |
| B. | condensed and raw |
| C. | feed-water and clean water |
| D. | hot and cold water |
| Answer» A. open feed system and closed feed system | |
| 220. |
In a fire tube boiler, the water to be heated is kept in the ________ |
| A. | tubes of the setup |
| B. | shell of the setup with hot gas in tubes |
| C. | tank with a fire chamber that conducts heat by steel rods |
| D. | tank and heated by fire below it |
| Answer» B. shell of the setup with hot gas in tubes | |
| 221. |
Which of the following statement is wrong? |
| A. | water tube boilers are internally fired |
| B. | locomotive boiler is a water tube boiler |
| C. | la-mont boiler is a low pressure water tube boiler |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 222. |
An air preheater is installed ___________ |
| A. | between the economiser and chimney |
| B. | before the superheater |
| C. | before the economiser |
| D. | none of the mentioned |
| Answer» A. between the economiser and chimney | |
| 223. |
What is the length of shell of a Locomotive boiler? |
| A. | 2m |
| B. | 3m |
| C. | 4m |
| D. | 6m |
| Answer» C. 4m | |
| 224. |
What is the function of a flywheel? |
| A. | to convert reciprocating motion of the piston into rotary motion |
| B. | to prevent fluctuation of speed |
| C. | to keep the engine speed uniform at all load conditions |
| D. | to convert rotary motion of the crankshaft into to and fro motion of the valve rod |
| Answer» B. to prevent fluctuation of speed | |
| 225. |
The shell diameter of a Locomotive boiler is? |
| A. | 1.5m |
| B. | 1m |
| C. | 2m |
| D. | 2.5m |
| Answer» A. 1.5m | |
| 226. |
Which of the following is a water tube boiler? |
| A. | lancashire boiler |
| B. | cochran boiler |
| C. | babcock & wilcox boiler |
| D. | locomotive boiler |
| Answer» C. babcock & wilcox boiler | |
| 227. |
The number of fire tubes in a Cochran boiler are ___________ |
| A. | 75 |
| B. | 165 |
| C. | 225 |
| D. | 175 |
| Answer» B. 165 | |
| 228. |
The chimney draught varies with? |
| A. | climatic conditions |
| B. | temperature of furnace gases |
| C. | height of chimney |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 229. |
The diagram factor is the ratio of ___________ |
| A. | area of actual indicator diagram to the area of theoretical indicator diagram |
| B. | actual work done per stroke to the theoretical work done per stroke |
| C. | actual mean effective pressure to the theoretical mean effective pressure |
| D. | any of the above mentioned |
| Answer» D. any of the above mentioned | |
| 230. |
The diameter of a cylindrical shell of a Scotch marine boiler varies from ___________ |
| A. | 3.5 to 4.5m |
| B. | 1.5 to 2m |
| C. | 2.5 to 3.5m |
| D. | none of the mentioned |
| Answer» C. 2.5 to 3.5m | |
| 231. |
Lancashire boiler has _____ internal flue tubes. |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» C. 2 | |
| 232. |
Locomotive boiler is a ___________ |
| A. | single tube, vertical, externally fired & stationary boiler |
| B. | single tube, horizontal, internally fired& stationary boiler |
| C. | multitubular, horizontal, externally fired & stationary boiler |
| D. | multitubular, horizontal, internally fired & mobile boiler |
| Answer» D. multitubular, horizontal, internally fired & mobile boiler | |
| 233. |
The equivalent evaporation is defined as? |
| A. | the ratio of heat actually used in producing the steam to the heat liberated in the furnace |
| B. | the amount of water evaporated or steam produced in kg of fuel burnt |
| C. | the amount of water evaporated from and at 100 degree c into dry & saturated steam |
| D. | none of the mentioned |
| Answer» C. the amount of water evaporated from and at 100 degree c into dry & saturated steam | |
| 234. |
Non Condensing steam turbine can also be called as _________ |
| A. | extraction steam turbine |
| B. | back pressure steam turbine |
| C. | impulse steam turbine |
| D. | none of the mentioned |
| Answer» B. back pressure steam turbine | |
| 235. |
Condensing turbine is used for __________ |
| A. | central power generation |
| B. | to reduce outlet temperature |
| C. | to increase efficiency of steam |
| D. | none of the mentioned |
| Answer» A. central power generation | |
| 236. |
Steam turbine is classified on basis of __________ |
| A. | type of blades |
| B. | exhausting condition |
| C. | type of steam flow |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 237. |
High pressure turbine is a Non-Condensing turbine due to __________ |
| A. | exhaust conditions |
| B. | axial flow of the steam |
| C. | pressure-velocity compounding |
| D. | velocity compounding |
| Answer» A. exhaust conditions | |
| 238. |
Impulse blades are in the shape of __________ |
| A. | rain drop |
| B. | circular |
| C. | half moon |
| D. | none of the mentioned |
| Answer» C. half moon | |
| 239. |
Astern turbines are used in _________ |
| A. | power generation |
| B. | marine purposes |
| C. | aircraft |
| D. | none of the mentioned |
| Answer» B. marine purposes | |
| 240. |
In condensing turbines vacuum is obtained by ____________ |
| A. | sudden pressure drop |
| B. | removal of non condensable gases |
| C. | sudden drop in pressure and by removal of non condensable gases |
| D. | none of the mentioned |
| Answer» C. sudden drop in pressure and by removal of non condensable gases | |
| 241. |
Cross compound steam turbines are once used in _____________ |
| A. | generation of electricity |
| B. | marine ships |
| C. | automobiles |
| D. | none of the mentioned |
| Answer» B. marine ships | |
| 242. |
Where in industries do we find back-pressure turbines? |
| A. | at a point in industry where waste steam has to be employed |
| B. | when pressure needs to be applied at rear end |
| C. | when one turbine bolster other |
| D. | there is a requirement of process steam at single pressure |
| Answer» D. there is a requirement of process steam at single pressure | |
| 243. |
The energy conversion occurring in a steam turbine is a ______ step process. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 244. |
A steam turbine is basically an assemblage of ____________ |
| A. | nozzle & condenser |
| B. | blades & condenser |
| C. | nozzle & blades |
| D. | nozzle & fans |
| Answer» C. nozzle & blades | |
| 245. |
A regenerative steam cycle renders ____________ |
| A. | decreased work output per unit mass of steam |
| B. | increased thermal efficiency |
| C. | increased work output per unit mass of steam |
| D. | decreased work output per unit mass of steam as well as increased thermal efficiency |
| Answer» D. decreased work output per unit mass of steam as well as increased thermal efficiency | |
| 246. |
The reheat factor is the ratio of the ____________ |
| A. | total useful heat drop to the total isentropic heat drop |
| B. | cumulative heat drop to the isentropic heat drop |
| C. | isentropic heat drop to the heat supplied |
| D. | none of the mentioned |
| Answer» B. cumulative heat drop to the isentropic heat drop | |
| 247. |
Thermal equilibrium means that the flow of steam is ____________ |
| A. | hyperbolic |
| B. | isothermal |
| C. | isentropic |
| D. | polytropic |
| Answer» C. isentropic | |
| 248. |
Multi-stage steam turbines are of the ___________ |
| A. | reaction type |
| B. | velocity compounded type |
| C. | pressure compounded type |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 249. |
The impulse reaction turbine has its driving force ___________ |
| A. | partly as an impulsive force and partly as a reaction force |
| B. | as an impulsive force |
| C. | as a reaction force |
| D. | none of the mentioned |
| Answer» A. partly as an impulsive force and partly as a reaction force | |
| 250. |
In a nozzle, whole frictional loss is assumed to occur between ___________ |
| A. | inlet and throat |
| B. | throat and exit |
| C. | inlet and outlet |
| D. | none of the mentioned |
| Answer» B. throat and exit | |
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