MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 463 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
In reaction turbines, the axial thrust is due to ____________ |
| A. | pressure drop across the rotor |
| B. | change in axial velocity |
| C. | both pressure drop across the rotor and change in axial velocity |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 202. |
The value of the reheat factor varies from ____________ |
| A. | 1.08 to 1.10 |
| B. | 1.2 to 1.6 |
| C. | 1.6 to 2 |
| D. | 1.02 to 1.06 |
| Answer» E. | |
| 203. |
Rateau turbine is ____________ |
| A. | pressure-velocity compounded turbine |
| B. | simple reaction turbine |
| C. | velocity compounded turbine |
| D. | pressure compounded turbine |
| Answer» E. | |
| 204. |
The ratio of the useful heat drop to the isentropic heat drop is called ____________ |
| A. | condenser efficiency |
| B. | nozzle efficiency |
| C. | vacuum efficiency |
| D. | boiler efficiency |
| Answer» C. vacuum efficiency | |
| 205. |
The Parsons’ reaction turbine has ____________ |
| A. | only moving blades |
| B. | only fixed blades |
| C. | fixed and moving blades of different shape |
| D. | identical fixed and moving blades |
| Answer» E. | |
| 206. |
The flow through a nozzle is regarded as ___________ |
| A. | isothermal flow |
| B. | isobaric flow |
| C. | isochoric flow |
| D. | isentropic flow |
| Answer» E. | |
| 207. |
De-Laval turbine is a ____________ |
| A. | multi rotor impulse turbine |
| B. | impulse reaction turbine |
| C. | single rotor impulse turbine |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 208. |
The critical pressure gives the velocity of steam at the throat ___________ |
| A. | equal to the velocity of sound |
| B. | more than velocity of sound |
| C. | less than the velocity of light |
| D. | none of the mentioned |
| Answer» B. more than velocity of sound | |
| 209. |
The steam leaves the nozzle at a ____________ |
| A. | low pressure and a high velocity |
| B. | high pressure and a high velocity |
| C. | high pressure and a low velocity |
| D. | low pressure and a low velocity |
| Answer» B. high pressure and a high velocity | |
| 210. |
What is the action of steam in a steam turbine? |
| A. | neither static nor dynamic |
| B. | dynamic |
| C. | static |
| D. | both dynamic & static |
| Answer» C. static | |
| 211. |
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» B. as an impulsive force | |
| 212. |
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» C. inlet and outlet | |
| 213. |
Thermal equilibrium means that the flow of steam is ____________ |
| A. | hyperbolic |
| B. | isothermal |
| C. | isentropic |
| D. | polytropic |
| Answer» D. polytropic | |
| 214. |
The ratio of total useful heat drop to the total isentropic heat drop is called? |
| A. | rankine efficiency |
| B. | stage efficiency |
| C. | internal efficiency |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 215. |
Multi-stage steam turbines are of the ___________ |
| A. | reaction type |
| B. | velocity compounded type |
| C. | pressure compounded type |
| D. | all of the mentioned |
| Answer» E. | |
| 216. |
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» E. | |
| 217. |
A steam turbine is basically an assemblage of ____________ |
| A. | nozzle & condenser |
| B. | blades & condenser |
| C. | nozzle & blades |
| D. | nozzle & fans |
| Answer» D. nozzle & fans | |
| 218. |
The energy conversion occurring in a steam turbine is a ______ step process. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 219. |
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» C. isentropic heat drop to the heat supplied | |
| 220. |
Cross compound steam turbines are once used in _____________ |
| A. | generation of electricity |
| B. | marine ships |
| C. | automobiles |
| D. | none of the mentioned |
| Answer» C. automobiles | |
| 221. |
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» D. none of the mentioned | |
| 222. |
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» E. | |
| 223. |
Astern turbines are used in _________ |
| A. | power generation |
| B. | marine purposes |
| C. | aircraft |
| D. | none of the mentioned |
| Answer» C. aircraft | |
| 224. |
Impulse blades are in the shape of __________ |
| A. | rain drop |
| B. | circular |
| C. | half moon |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 225. |
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» B. axial flow of the steam | |
| 226. |
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» E. | |
| 227. |
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» B. to reduce outlet temperature | |
| 228. |
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» C. impulse steam turbine | |
| 229. |
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» E. | |
| 230. |
Lancashire boiler has _____ internal flue tubes. |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 231. |
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» D. none of the mentioned | |
| 232. |
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» D. none of the mentioned | |
| 233. |
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» E. | |
| 234. |
The number of fire tubes in a Cochran boiler are ___________ |
| A. | 75 |
| B. | 165 |
| C. | 225 |
| D. | 175 |
| Answer» C. 225 | |
| 235. |
Which of the following is a water tube boiler? |
| A. | lancashire boiler |
| B. | cochran boiler |
| C. | babcock & wilcox boiler |
| D. | locomotive boiler |
| Answer» D. locomotive boiler | |
| 236. |
The chimney draught varies with? |
| A. | climatic conditions |
| B. | temperature of furnace gases |
| C. | height of chimney |
| D. | all of the mentioned |
| Answer» E. | |
| 237. |
The shell diameter of a Locomotive boiler is? |
| A. | 1.5m |
| B. | 1m |
| C. | 2m |
| D. | 2.5m |
| Answer» B. 1m | |
| 238. |
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» C. to keep the engine speed uniform at all load conditions | |
| 239. |
What is the length of shell of a Locomotive boiler? |
| A. | 2m |
| B. | 3m |
| C. | 4m |
| D. | 6m |
| Answer» D. 6m | |
| 240. |
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» B. before the superheater | |
| 241. |
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» C. tank with a fire chamber that conducts heat by steel rods | |
| 242. |
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» B. condensed and raw | |
| 243. |
Which draught system is used as conjunction with chimney draught? |
| A. | forced steam draught |
| B. | forced draught |
| C. | induced draught |
| D. | balanced draught |
| Answer» B. forced draught | |
| 244. |
Which draught system is also known as turbine draught? |
| A. | forced steam draught |
| B. | induced steam draught |
| C. | natural draught |
| D. | fan draught |
| Answer» B. induced steam draught | |
| 245. |
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» E. | |
| 246. |
Which is most preferred type of draught system? |
| A. | chimney draught |
| B. | fan draught |
| C. | force draught |
| D. | balanced draught |
| Answer» E. | |
| 247. |
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» E. | |
| 248. |
What is installed to transfer air into furnace in forced draught system? |
| A. | air blower |
| B. | tuyeres |
| C. | draft gauges |
| D. | cyclone separator |
| Answer» B. tuyeres | |
| 249. |
Artificial draught is also called as _______ |
| A. | force draught |
| B. | induced draught |
| C. | balanced draught |
| D. | mechanical draught |
| Answer» E. | |
| 250. |
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» C. above the boiler | |