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.
| 351. |
The vapour going to condenser is in temperature and in ammonia. |
| A. | higher, less |
| B. | higher, richer |
| C. | lower, less |
| D. | lower, richer |
| Answer» E. | |
| 352. |
Which of the following condenses first? |
| A. | ammonia vapour |
| B. | water vapour |
| C. | both condense at same temperature |
| D. | none of the mentioned |
| Answer» C. both condense at same temperature | |
| 353. |
In the aqua-ammonia absorption system, |
| A. | water is the refrigerant and ammonia is the absorbent |
| B. | ammonia is the refrigerant and water is the absorbent |
| C. | both ammonia and water can be used as refrigerant or absorbent |
| D. | none of the mentioned |
| Answer» C. both ammonia and water can be used as refrigerant or absorbent | |
| 354. |
In absorption system, compressor in vapour compression cycle is replaced by absorber- generator assembly. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 355. |
In absorption refrigeration cycle, which of the following is used? |
| A. | refrigerant |
| B. | absorbent |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 356. |
A condenser must and then the compressed refrigerant. |
| A. | superheat, evaporate |
| B. | desuperheat, evaporate |
| C. | superheat, condense |
| D. | desuperheat, condense |
| Answer» E. | |
| 357. |
Which of the following is recommended in a refrigeration cycle? |
| A. | superheating of vapour |
| B. | subcooling of liquid |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 358. |
One tonne of refrigeration is given as the rate of heat removal from surroundings equivalent to heat required for melting one tonne of ice in a day. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 359. |
The COP of cycle is given by(Q2=heat absorbed by evaporator and Wc=work done by compressor) |
| A. | 1- (q2/wc) |
| B. | 1- (wc/q2) |
| C. | q2/wc |
| D. | wc/q2 |
| Answer» D. wc/q2 | |
| 360. |
In the expansion process, which of the following remains constant? |
| A. | work done |
| B. | heat supplied |
| C. | internal energy |
| D. | enthalpy |
| Answer» E. | |
| 361. |
The evaporator produces the cooling or refrigerating effect. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 362. |
The evaporation process is a |
| A. | constant volume reversible process |
| B. | constant pressure reversible process |
| C. | adiabatic throttling process |
| D. | reversible adiabatic process |
| Answer» C. adiabatic throttling process | |
| 363. |
The expansion process is |
| A. | isentropic |
| B. | reversible |
| C. | adiabatic |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 364. |
Why is wet compression not preferred? |
| A. | the liquid refrigerant can be trapped in the head of cylinder |
| B. | this may damage the valves or cylinder head |
| C. | liquid refrigerant can wash away the lubricating oil thus accelerating wear |
| D. | all of the mentioned |
| Answer» E. | |
| 365. |
Wet compression is preferred over dry compression. |
| A. | true |
| B. | false |
| Answer» C. | |
| 366. |
Compression can be |
| A. | dry compression |
| B. | wet compression |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 367. |
Which of the following operations occur in a vapour refrigeration cycle? |
| A. | compression |
| B. | cooling and condensing |
| C. | expansion and evaporation |
| D. | all of the mentioned |
| Answer» E. | |
| 368. |
In how many categories heat exchangers are classified on the basis of physical state of heat exchanging fluids? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 369. |
In how many categories heat exchangers are classified on the basis of direction of flow of fluids? |
| A. | 4 categories |
| B. | 3 categories |
| C. | 2 categories |
| D. | 1 categories |
| Answer» C. 2 categories | |
| 370. |
Which of the following is not an example of recuperators type heat exchanger? |
| A. | automobile radiators |
| B. | condensers |
| C. | chemical factories |
| D. | oil heaters for an aero plane |
| Answer» D. oil heaters for an aero plane | |
| 371. |
Which type of flow arrangement is this? |
| A. | counter flow |
| B. | parallel flow |
| C. | regenerator |
| D. | shell and tube |
| Answer» C. regenerator | |
| 372. |
The energy transfer between the hot fluid and cold fluids is brought about by their complete physical mixing in |
| A. | direct contact heat exchanger |
| B. | regenerators |
| C. | recuperators |
| D. | boilers |
| Answer» B. regenerators | |
| 373. |
Based upon the nature of heat exchange process, the heat exchangers are classified into how many categories |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 374. |
Heat exchangers are classified into how many categories? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 375. |
Pass-out turbines are used in which of these cases? |
| A. | relatively high back pressure |
| B. | small heating requirement |
| C. | only relatively low back pressure |
| D. | both relatively high back pressure and small heating requirement |
| Answer» E. | |
| 376. |
Which of these is not an application of back pressure turbine? |
| A. | desalination of sea water |
| B. | filtration of water |
| C. | process industries |
| D. | petrochemical installations |
| Answer» C. process industries | |
| 377. |
A turbine comprising of fixed blades and moving nozzles is called as reaction turbines. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 378. |
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 | |
| 379. |
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. | |
| 380. |
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 | |
| 381. |
Compounding efficiency at low speed. |
| A. | decrease |
| B. | increase |
| C. | maximizes |
| D. | none of the mentioned |
| Answer» C. maximizes | |
| 382. |
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 | |
| 383. |
When steam reaches turbine blades the type of force responsible for moving turbine blades are |
| A. | axial force |
| B. | shear force |
| C. | longitudinal force |
| D. | none of the mentioned |
| Answer» B. shear force | |
| 384. |
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 | |
| 385. |
Astern turbines are used in |
| A. | power generation |
| B. | marine purposes |
| C. | aircraft |
| D. | none of the mentioned |
| Answer» C. aircraft | |
| 386. |
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 | |
| 387. |
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 | |
| 388. |
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. | |
| 389. |
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 | |
| 390. |
Which turbines are employed for driving alternator at synchronous speed? |
| A. | central station turbine |
| B. | reheating turbine |
| C. | extraction turbine |
| D. | extraction induction turbine |
| Answer» B. reheating turbine | |
| 391. |
Majority of the turbines are axial flow type. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 392. |
Which among the following fuels need excess amount of air for complete combustion? |
| A. | natural fuels |
| B. | liquid fuels |
| C. | gaseous fuels |
| D. | artificial solid fuels |
| Answer» E. | |
| 393. |
Which liquid fuel has a wider composition than diesel and used in furnaces of oil fired boiler? |
| A. | fuel oil |
| B. | petrol |
| C. | distillate |
| D. | alcohol |
| Answer» B. petrol | |
| 394. |
Which is the artificial liquid fuel obtained by fermentation process? |
| A. | fuel oil |
| B. | alcohol |
| C. | distillate |
| D. | kerosene |
| Answer» C. distillate | |
| 395. |
Which of the following is not a type of steam turbine? |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | pelton wheel turbine |
| D. | axial flow type turbine |
| Answer» D. axial flow type turbine | |
| 396. |
Which fuel is slightly heavier than kerosene and is produced in petroleum fractions? |
| A. | diesel |
| B. | crude oil |
| C. | gasoline |
| D. | distillate |
| Answer» E. | |
| 397. |
Which fuel has higher thermodynamic efficiency in liquid fuels? |
| A. | diesel |
| B. | petrol |
| C. | kerosene |
| D. | lpg |
| Answer» B. petrol | |
| 398. |
Which fuel is heavier than petrol but less volatile and it is commonly used as domestic fuel? |
| A. | diesel |
| B. | distilled fuel |
| C. | kerosene |
| D. | alcohol |
| Answer» D. alcohol | |
| 399. |
Name the process used to eliminate impurities present in crude oil? |
| A. | distillation |
| B. | filtration |
| C. | sedimentation |
| D. | coagulation |
| Answer» B. filtration | |
| 400. |
In what forms are liquid fuels available in nature? |
| A. | light distillate |
| B. | petroleum spirit |
| C. | petroleum naphtha |
| D. | crude petroleum |
| Answer» E. | |