MCQOPTIONS
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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.
| 251. |
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» D. when there are many components inside the boiler | |
| 252. |
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» B. size of the furnace | |
| 253. |
By what is natural draught produced? |
| A. | air duct |
| B. | chimney |
| C. | locomotive exhaust |
| D. | air blower |
| Answer» C. locomotive exhaust | |
| 254. |
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» D. stabilizes the boiler system | |
| 255. |
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» B. ht = hv + hb – hc + hcd | |
| 256. |
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» E. | |
| 257. |
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» C. overheating of the components | |
| 258. |
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» B. provide better efficiency by re-circulating gas coming out of turbine | |
| 259. |
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» D. due to the chemicals added in water | |
| 260. |
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» E. | |
| 261. |
Which type of circulation is incurred in Schmidt-Hartmann boiler? |
| A. | natural circulation |
| B. | positive forced circulation |
| C. | forced circulation |
| D. | once-through circulation |
| Answer» B. positive forced circulation | |
| 262. |
What is used to heat the feed water which is used for recirculation through tubes? |
| A. | condenser |
| B. | pre-heater |
| C. | economizer |
| D. | water clarifier |
| Answer» D. water clarifier | |
| 263. |
How many circuits are there in the Schmidt-Hartmann boiler? |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 264. |
Which boiler is most successful boiler in the gas turbine industries? |
| A. | because it has greater flexibility |
| B. | it is easy to control, it’s fully automatic |
| C. | it has higher thermal efficiency of all |
| D. | can increase heat transfer without changing its size |
| Answer» E. | |
| 265. |
What type of boiler is a Velox boiler? |
| A. | forced circulation boiler |
| B. | natural circulation boiler |
| C. | positively forced circulation boiler |
| D. | once- through boiler |
| Answer» B. natural circulation boiler | |
| 266. |
Where is water steam separator drum located in Lamont boiler? |
| A. | inside of the boiler |
| B. | right above the furnace |
| C. | before the feed water pump |
| D. | outside of boiler |
| Answer» E. | |
| 267. |
Which of the given boilers velocity of flue gases is greater than velocity of sound? |
| A. | benson boiler |
| B. | la-mont boiler |
| C. | schmidt-hartmann boiler |
| D. | velox boiler |
| Answer» E. | |
| 268. |
What is the temperature at which the steam boilers are capable to withstand? |
| A. | 200oc |
| B. | 280oc |
| C. | 540oc |
| D. | 358oc |
| Answer» D. 358oc | |
| 269. |
How can be the plant efficiency of steam power plant is increased? |
| A. | by using high pressure and high temperature steam |
| B. | by equipping ash and flue gas clearance system |
| C. | by maintaining the boiler on daily basis by cleaning the soot and combustion products |
| D. | by using better and efficient type of fuel for combustion |
| Answer» B. by equipping ash and flue gas clearance system | |
| 270. |
In what is water in high pressure boiler circulated through? |
| A. | conduits |
| B. | cove |
| C. | channel |
| D. | tubes |
| Answer» E. | |
| 271. |
What is needed to be increased to increase the heat transfer rate in the boiler? |
| A. | gas velocities |
| B. | fuel input |
| C. | water velocities |
| D. | air supply |
| Answer» D. air supply | |
| 272. |
Why single boiler unit per turbine is equipped commonly? |
| A. | for better turbine control |
| B. | to deduce the costs |
| C. | for overcoming losses of power |
| D. | to improve the efficiency |
| Answer» B. to deduce the costs | |
| 273. |
Why starting valve is closed and valve 2 is opened while taking boiler on range in Benson boiler? |
| A. | avoid excessive heating of tube |
| B. | to maintain the constant flow of water |
| C. | to avoid pressure built up in tubes |
| D. | to avoid pipe leakages at joints |
| Answer» B. to maintain the constant flow of water | |
| 274. |
What is the major disadvantage of the Benson boilers? |
| A. | boiler is big in size |
| B. | has large storage capacity |
| C. | deposition of salts |
| D. | bubble formation |
| Answer» D. bubble formation | |
| 275. |
What is the function of boiler? |
| A. | to burn the fuel in a confined closed system with the supply of air |
| B. | to generate steam at varying pressure |
| C. | to generate steam at constant pressure |
| D. | to produce flue gases by burning fuel at a given pressure |
| Answer» D. to produce flue gases by burning fuel at a given pressure | |
| 276. |
What is the capacity of Benson boiler? |
| A. | 180 tonnes/hr & above |
| B. | 150 tonnes/hr & above |
| C. | 250 tonnes/hr & above |
| D. | 300 tonnes/hr & above |
| Answer» C. 250 tonnes/hr & above | |
| 277. |
What type of boiler is a Benson boiler? |
| A. | super critical boiler |
| B. | fire tube boiler |
| C. | natural circulation boiler |
| D. | over-through boiler |
| Answer» B. fire tube boiler | |
| 278. |
What is the main disadvantage of Lamont boiler? |
| A. | less flexible in design |
| B. | low heat transfer rate |
| C. | formation of bubbles |
| D. | low steam generation capacity |
| Answer» D. low steam generation capacity | |
| 279. |
What type of steam is generated by evaporator tube of Lamont boiler? |
| A. | saturated steam |
| B. | unsaturated steam |
| C. | superheated steam |
| D. | flash steam |
| Answer» B. unsaturated steam | |
| 280. |
What is the pressure range between which Lamont boilers operates? |
| A. | 80-120bar |
| B. | 120-160bar |
| C. | 180-360bar |
| D. | 450-560bar |
| Answer» C. 180-360bar | |
| 281. |
Through which does the even circulation of feed water is possible in Lamont boiler? |
| A. | nozzles |
| B. | water trough |
| C. | feed pump |
| D. | hose |
| Answer» B. water trough | |
| 282. |
What is called as the heart of the Lamont boiler? |
| A. | water drum |
| B. | centrifugal pump |
| C. | furnace |
| D. | blower |
| Answer» C. furnace | |
| 283. |
What type of boiler is a Lamont boiler? |
| A. | forced circulation |
| B. | natural circulation |
| C. | over-through |
| D. | positive forced circulation |
| Answer» B. natural circulation | |
| 284. |
Which type of boiler is it when the furnace is placed in the region of boiling water? |
| A. | internally fired boiler |
| B. | externally fired boiler |
| C. | babcock-wilcox boiler |
| D. | stirling boiler |
| Answer» B. externally fired boiler | |
| 285. |
In what form are the boiler’s tube arrange in Lamont boiler? |
| A. | parallel in vertical |
| B. | inclined vertically |
| C. | parallel in horizontal |
| D. | horizontally inclined |
| Answer» D. horizontally inclined | |
| 286. |
Compounding is used for _________ power applications. |
| A. | low |
| B. | high |
| C. | medium |
| D. | none of the mentioned |
| Answer» C. medium | |
| 287. |
Reaction turbine is also called as _________ |
| A. | impulse turbine |
| B. | curtis wheel |
| C. | parsons turbine |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 288. |
A velocity compounded impulse turbine is also called as __________ |
| A. | curtis wheel |
| B. | pressure compounded |
| C. | curtis wheel & pressure compounded |
| D. | none of the mentioned |
| Answer» B. pressure compounded | |
| 289. |
In velocity compounded turbines flow passage is from ____________ |
| A. | moving blades to fixed nozzles |
| B. | fixed nozzles to moving blades |
| C. | fixed blades to moving nozzles |
| D. | none of the mentioned |
| Answer» E. | |
| 290. |
Compounding __________ efficiency at low speed. |
| A. | decrease |
| B. | increase |
| C. | maximizes |
| D. | none of the mentioned |
| Answer» C. maximizes | |
| 291. |
A turbine having alternate blades and nozzles is called as _______________ |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | impulse & reaction turbine |
| D. | none of the mentioned |
| Answer» B. reaction turbine | |
| 292. |
Multi stage arrangement of turbines is called as __________ |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | compounding |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 293. |
In the equation Cd=1/K(0.5) what does K mean ? |
| A. | pressure drop inside the nozzle |
| B. | mass flow rate |
| C. | flow resistance |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 294. |
For sharp edge orifice, coefficient of discharge lies between ___________ |
| A. | 0.61 – 0.64 |
| B. | 0.87 – 0.89 |
| C. | 0.50 – 0.61 |
| D. | none of the mentioned |
| Answer» B. 0.87 – 0.89 | |
| 295. |
Coefficient of discharge is _____________ |
| A. | directly proportional to coefficient of discharge |
| B. | inversely proportional to square of the coefficient of discharge |
| C. | inversely proportional to coefficient of discharge |
| D. | directly proportional to square of coefficient of discharge |
| Answer» C. inversely proportional to coefficient of discharge | |
| 296. |
Coefficient of discharge is the ____________ |
| A. | product of coefficient of velocity and coefficient of contraction |
| B. | arithmetic sum of coefficient of velocity and coefficient of contraction |
| C. | ratio of coefficient of velocity and coefficient of contraction |
| D. | none of the mentioned |
| Answer» B. arithmetic sum of coefficient of velocity and coefficient of contraction | |
| 297. |
Unit of flow resistance is _________ |
| A. | n/m2 |
| B. | m2/n |
| C. | kn/kg |
| D. | no unit |
| Answer» E. | |
| 298. |
Coefficient of discharge is used to measure ___________ |
| A. | none of the mentioned |
| B. | pressure exerted by the nozzle on the fluid |
| C. | flow rate allowed by the nozzle |
| D. | resistance offered by the nozzle |
| Answer» E. | |
| 299. |
Coefficient of discharge is the __________ of Actual discharge to the theoretical discharge. |
| A. | ratio |
| B. | product |
| C. | sum |
| D. | none |
| Answer» B. product | |
| 300. |
When steam is transported dryness fraction _________ |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |