McqMate
| 301. |
Energy recovery is typically via production of __________ |
| A. | gas |
| B. | heat |
| C. | light |
| D. | steam |
| Answer» D. steam | |
| 302. |
Which of the following industrial process uses waste as a fuel? |
| A. | cement kilns |
| B. | lead manufacturing |
| C. | acid manufacturing |
| D. | sulphur manufacturing |
| Answer» A. cement kilns | |
| 303. |
What is the combustion temperature range in cement kiln incineration? |
| A. | 1300-1600 |
| B. | 1350-1650 |
| C. | 1250-1450 |
| D. | 1235-1600 |
| Answer» B. 1350-1650 | |
| 304. |
Non-volatile heavy metals in kiln are fixed into __________ |
| A. | clinker’s crystalline structure |
| B. | fumes |
| C. | solid lump |
| D. | slag |
| Answer» A. clinker’s crystalline structure | |
| 305. |
Which of the following waste types are not suitable for co-combustion in cement kilns? |
| A. | chlorine |
| B. | hydrogen |
| C. | calcium |
| D. | carbonate |
| Answer» A. chlorine | |
| 306. |
. Due to the limits, upper efficiency of steam turbines is fixed to _________ |
| A. | 10-15% |
| B. | 25-45% |
| C. | 20-40% |
| D. | 35-45% |
| Answer» D. 35-45% | |
| 307. |
How many sections does waste heat recovery boiler have in steam generators? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 308. |
Turbines that are run by exhaust gases are called _______ |
| A. | power recovery turbines |
| B. | stepped turbines |
| C. | turbo compounded engine |
| D. | none of the mentioned |
| Answer» A. power recovery turbines | |
| 309. |
Combination of two or more thermodynamic processes gives _________ |
| A. | decrease in efficiency |
| B. | increase in efficiency |
| C. | increases the temperature at exhaust |
| D. | none of the mentioned |
| Answer» B. increase in efficiency | |
| 310. |
By using combined cycle steam and gas power plant _________ |
| A. | specific fuel consumption can be decreased |
| B. | efficiency increased |
| C. | specific fuel consumption can be decreased and efficiency increased |
| D. | none of the mentioned |
| Answer» C. specific fuel consumption can be decreased and efficiency increased | |
| 311. |
What are turbo-compound engines? |
| A. | turbines run at exhausts of otto and diesel cycles |
| B. | combination of turbofan and turbojet engines |
| C. | combination of turboprop and turbofan engines |
| D. | none of the mentioned |
| Answer» A. turbines run at exhausts of otto and diesel cycles | |
| 312. |
The mercury steam cycle represents how many coupled Rankine cycles? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 313. |
In the mercury steam cycle, the mercury cycle is called? |
| A. | bottoming cycle |
| B. | middle cycle |
| C. | topping cycle |
| D. | none of the mentioned |
| Answer» C. topping cycle | |
| 314. |
In the mercury steam cycle, the steam cycle is called? |
| A. | bottoming cycle |
| B. | middle cycle |
| C. | topping cycle |
| D. | none of the mentioned |
| Answer» A. bottoming cycle | |
| 315. |
Apart from mercury & steam, which of these is a component of tertiary cycle? |
| A. | nitrogen di-oxide |
| B. | water |
| C. | carbon di-oxide |
| D. | sulphur di-oxide |
| Answer» D. sulphur di-oxide | |
| 316. |
The addition of sulphur dioxide in a tertiary cycle is at? |
| A. | high temperature |
| B. | low temperature |
| C. | too high temperature |
| D. | none of the mentioned |
| Answer» B. low temperature | |
| 317. |
Which of these can also be used as a topping fluid? |
| A. | sodium |
| B. | calcium |
| C. | boron |
| D. | titanium |
| Answer» A. sodium | |
| 318. |
Which of these can be used as a fluid in the bottoming fluid? |
| A. | mercury |
| B. | ammonia |
| C. | calcium |
| D. | sodium |
| Answer» B. ammonia | |
| 319. |
In case of Sodium-mercury-steam cycle, which is the topping fluid? |
| A. | mercury |
| B. | steam |
| C. | sodium |
| D. | cannot say |
| Answer» C. sodium | |
| 320. |
In case of mercury-steam-sulphur dioxide cycle, which is the bottoming fluid? |
| A. | mercury |
| B. | steam |
| C. | sulphur dioxide |
| D. | cannot say |
| Answer» C. sulphur dioxide | |
| 321. |
The total loss in a tertiary cycle is? |
| A. | sum of losses in the individual cycles |
| B. | product of losses in the individual cycles |
| C. | sum of products of individual losses |
| D. | none of the mentioned |
| Answer» B. product of losses in the individual cycles | |
| 322. |
Room air conditioners and packaged units are examples of _________ |
| A. | direct expansion systems |
| B. | indirect expansion systems |
| C. | chilled water systems |
| D. | indirect contraction systems |
| Answer» A. direct expansion systems | |
| 323. |
The process of extraction of the certain required amount of water from air is known as ___________ |
| A. | heating |
| B. | cooling |
| C. | humidification |
| D. | dehumidification |
| Answer» D. dehumidification | |
| 324. |
The reciprocal of thermal conductivity is known as __________ |
| A. | thermal conductance |
| B. | surface resistance |
| C. | specific conductance |
| D. | thermal resistivity |
| Answer» D. thermal resistivity | |
| 325. |
Condensers and evaporators together form a ____________ |
| A. | heat exchanger |
| B. | refrigeration system |
| C. | thermocouple |
| D. | heating system |
| Answer» B. refrigeration system | |
| 326. |
In traditional Refrigerators in home appliances, what is the type of condenser used? |
| A. | natural convection type |
| B. | forced convection type |
| C. | furnace type |
| D. | rotary condensers |
| Answer» A. natural convection type | |
| 327. |
In traditional Air conditioners in home appliances, what is the type of condenser used? |
| A. | natural convection type |
| B. | forced convection type |
| C. | flash type |
| D. | rotary condensers |
| Answer» B. forced convection type | |
| 328. |
In evaporative condensers, ___________ used to extract heat from the condensing refrigerant. |
| A. | air is |
| B. | both air and water are |
| C. | water is |
| D. | either air or water is |
| Answer» B. both air and water are | |
| 329. |
Evaporative condensers combine the features of a _____________ in a single unit. |
| A. | cooling tower and water-cooled condenser |
| B. | falling tower and water-cooled condenser |
| C. | cooling tower and air condenser |
| D. | rising film tower and water-cooled condenser |
| Answer» A. cooling tower and water-cooled condenser | |
| 330. |
Evaporative condensers are used in places where water is _________ |
| A. | scarce |
| B. | plenty |
| C. | moderately available |
| D. | sufficient |
| Answer» A. scarce | |
| 331. |
What is the meaning of heat rejection ratio (HRR) of a condenser? |
| A. | ratio of heat rejected to the heat absorbed |
| B. | ratio of heat absorbed to the heat rejected |
| C. | ratio of heat required to the heat lost |
| D. | ratio of heat wasted in a cycle to the heat absorbed |
| Answer» A. ratio of heat rejected to the heat absorbed | |
| 332. |
What is the relation between heat rejection ratio (HRR) and Coefficient of performance (COP)? |
| A. | hrr = 1 + 1/cop |
| B. | hrr = 1+ cop |
| C. | hrr = cop/2 |
| D. | hrr = 1/cop |
| Answer» A. hrr = 1 + 1/cop | |
| 333. |
Which type of fins are the most commonly used fin type in condensers? |
| A. | annular fin |
| B. | plate type fins |
| C. | tube fin |
| D. | extended double pipe |
| Answer» B. plate type fins | |
| 334. |
Shell and coil type condensers have a capacity at around ________ |
| A. | 10 tr |
| B. | 20 tr |
| C. | 30 tr |
| D. | 50 tr |
| Answer» D. 50 tr | |
| 335. |
Double pipe water cooling condensers have a capacity at around ________ |
| A. | 10 tr |
| B. | 20 tr |
| C. | 30 tr |
| D. | 50 tr |
| Answer» A. 10 tr | |
| 336. |
If there is a decrease in viscosity, the heat transfer coefficient ____________ |
| A. | increase |
| B. | decrease |
| C. | remains same |
| D. | becomes zero |
| Answer» A. increase | |
| 337. |
An increase in diameter means a _________ heat transfer coefficient. |
| A. | larger |
| B. | smaller |
| C. | zero |
| D. | infinite |
| Answer» B. smaller | |
| 338. |
why is an analyser-rectifier combination is used in absorption refrigeration cycle? |
| A. | to increase the amount of water vapour in ammonia vapour |
| B. | to decrease the amount of water vapour in ammonia vapour |
| C. | to eliminate the water vapour from ammonia vapour |
| D. | all of the mentioned |
| Answer» C. to eliminate the water vapour from ammonia vapour | |
| 339. |
The vapour going to condenser is ____ in temperature and ____ in ammonia. |
| A. | higher, less |
| B. | higher, richer |
| C. | lower, less |
| D. | lower, richer |
| Answer» D. lower, richer | |
| 340. |
Water is used as a ____ in air conditioning units. |
| A. | absorbent |
| B. | refrigerant |
| C. | absorbent and refrigerant |
| D. | none of the mentioned |
| Answer» B. refrigerant | |
| 341. |
The COP of absorption refrigeration system is |
| A. | low |
| B. | high |
| C. | equal to that of vapour compression refrigeration system |
| D. | none of the mentioned |
| Answer» A. low | |
| 342. |
The wet bulb temperature is the ____ temperature recorded by moistened bulb. |
| A. | lowest |
| B. | highest |
| C. | atmospheric |
| D. | none of the mentioned |
| Answer» A. lowest | |
| 343. |
When unsaturated air flows over a sheet of water in an insulated chamber |
| A. | specific humidity of air decreases |
| B. | the water evaporates |
| C. | both air and water are cooled during evaporation |
| D. | all of the mentioned |
| Answer» A. specific humidity of air decreases | |
| 344. |
When humidity ratio of air ____ air is said to be dehumidified. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 345. |
Cooling towers are rated in terms of |
| A. | approach |
| B. | range |
| C. | both of the mentioned |
| D. | none of the |
| Answer» C. both of the mentioned | |
| 346. |
A nozzle used to send fluid in coherent stream is called as |
| A. | jet |
| B. | high velocity nozzle |
| C. | every nozzle sends fluid in coherent stream |
| D. | none of the mentioned |
| Answer» A. jet | |
| 347. |
In fountains the type of nozzle used is |
| A. | none of the mentioned |
| B. | turbulent jet |
| C. | high speed nozzle |
| D. | laminar jet |
| Answer» D. laminar jet | |
| 348. |
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop |
| A. | increases |
| B. | decreases |
| C. | is unpredictable |
| D. | remains same |
| Answer» B. decreases | |
| 349. |
The ratio of the useful heat drop to the isentropic heat drop is called |
| A. | condenser efficiency |
| B. | nozzle efficiency |
| Answer» B. nozzle efficiency | |
| 350. |
Critical pressure ratio is ratios of pressures at discharge. |
| A. | minimum |
| B. | none of the mentioned |
| C. | optimum |
| D. | maximum |
| Answer» D. maximum | |
| 351. |
The exit velocity in the nozzle increases as per |
| A. | stagnation point |
| B. | continuity equation |
| C. | prandtl number |
| D. | newton’s law |
| Answer» B. continuity equation | |
| 352. |
Compressible flow is a flow that deals with |
| A. | fluid temperature |
| B. | fluid pressure |
| C. | fluid density |
| D. | fluid geometry |
| Answer» C. fluid density | |
| 353. |
The coefficient of kinetic friction is less than the coefficient of static friction. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 354. |
A cubical block rests on an inclined plane of μ = 1/√3, determine the angle of inclination when the block just slides down the inclined plane? |
| A. | 40° |
| B. | 50° |
| C. | 30° |
| D. | 20° |
| Answer» C. 30° | |
| 355. |
When a gas is pushed through a pipe, the gaseous molecules are by the pipe’s walls |
| A. | attracted |
| B. | absorbed |
| C. | deflected |
| D. | dissipated |
| Answer» C. deflected | |
| 356. |
Gas flows through the nozzle from an area of pressure (called the chamber) to one of pressure |
| A. | high, low |
| B. | low, high |
| C. | same, same |
| D. | constant, infinite |
| Answer» A. high, low | |
| 357. |
On what basis are fire and water tube boilers are classified? |
| A. | depending the combustion products formed |
| B. | depending the state of fuel |
| C. | depending on the steam formation rate |
| D. | depending tubular heating surface |
| Answer» D. depending tubular heating surface | |
| 358. |
Stirling boiler is an example of which type of boiler? |
| A. | inclined tube boilers |
| B. | mobile boiler |
| C. | fire tube boiler |
| D. | water tube boiler |
| Answer» D. water tube boiler | |
| 359. |
Which of these is a stationary boiler? |
| A. | locomotive boiler |
| B. | marine boiler |
| C. | mobile boiler |
| D. | babcock-wilcox boiler |
| Answer» D. babcock-wilcox boiler | |
| 360. |
Which of these is a mobile boiler? |
| A. | lancashire boiler |
| B. | stirling boiler |
| C. | locomotive boiler |
| D. | cochran boiler |
| Answer» C. locomotive boiler | |
| 361. |
Are boilers defined on the basis of heat source. |
| A. | yes |
| B. | no |
| Answer» A. yes | |
| 362. |
What is the steam pressure limit of natural circulation boilers? |
| A. | 650bar |
| B. | 180bar |
| C. | 400bar |
| D. | 550bar |
| Answer» B. 180bar | |
| 363. |
Which of the given boilers operate above critical pressure? |
| A. | natural circulation boilers |
| B. | forced circulation boilers |
| C. | once-through boilers |
| D. | water tube boilers |
| Answer» C. once-through boilers | |
| 364. |
Which type of boilers are called drum-less boilers? |
| A. | natural circulation boilers |
| B. | fire tube boilers |
| C. | positive forced circulation boiler |
| D. | forced circulation boiler |
| Answer» C. positive forced circulation boiler | |
| 365. |
Chances of sediments depositing inside the water tubes in the shell is less due to? |
| A. | low working pressure |
| B. | natural circulation of water |
| C. | partial circulation of water |
| D. | high working pressure |
| Answer» D. high working pressure | |
| 366. |
Out of the given option choose the advantage that supports fire tube boilers? |
| A. | water circulation is cyclic |
| B. | used as a mobile boiler |
| C. | water circulation is limited inside boiler shell |
| D. | bursting of flue tube does not cause any explosion |
| Answer» C. water circulation is limited inside boiler shell | |
| 367. |
Tubular air preheater of a boiler is also called as |
| A. | recuperative air preheater |
| B. | elliptical air preheater |
| C. | ovoid air preheater |
| D. | squarish air preheater |
| Answer» A. recuperative air preheater | |
| 368. |
What does regenerative air preheater consists of? |
| A. | rotor |
| B. | skewers |
| C. | propeller |
| D. | piston |
| Answer» A. rotor | |
| 369. |
Which fuel is prepared by moulding finely ground coal under pressure? |
| A. | coke |
| B. | charcoal |
| C. | briquette coal |
| D. | lignite |
| Answer» C. briquette coal | |
| 370. |
Which fuel has the lightest liquid petroleum fraction? |
| A. | diesel |
| B. | petrol |
| C. | distillate |
| D. | kerosene |
| Answer» B. petrol | |
| 371. |
Which statement about impulse turbine is true? |
| A. | steam expands over blades |
| B. | steam expends completely in stationary nozzels |
| C. | steam expends partially over nozzle and turbine blades |
| D. | steam expends over blades incompletely |
| Answer» B. steam expends completely in stationary nozzels | |
| 372. |
In velocity compounding the steam is expanded from the boiler pressure to condenser pressure in one set of stationary blades on nozzle. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 373. |
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 | |
| 374. |
Reaction turbine works with the force obtained from change in pressure energy. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 375. |
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» A. impulse turbine | |
| 376. |
Compounding efficiency at low speed. |
| A. | decrease |
| B. | increase |
| C. | maximizes |
| D. | none of the mentioned |
| Answer» B. increase | |
| 377. |
In pressure compounded turbines moving nozzles are followed by turbine blades. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 378. |
In pressure compounded turbines flow passage is from |
| A. | moving nozzles to fixed blades |
| B. | fixed nozzles to moving blades |
| C. | fixed blades to moving nozzles |
| D. | none of the mentioned |
| Answer» B. fixed nozzles to moving blades | |
| 379. |
A plant producing both, electrical power & process heat simultaneously is? |
| A. | cogenital plant |
| B. | cogenerial plant |
| C. | cogeneration plant |
| D. | conglomerate plant |
| Answer» C. cogeneration plant | |
| 380. |
In a by-product power cycle? |
| A. | the power is produced initially |
| B. | power production is in the middle stages of the cycle |
| C. | power production is after the cycle has ended |
| D. | none of the mentioned |
| Answer» C. power production is after the cycle has ended | |
| 381. |
In terms of cost per MW compared to condensing sets of the same power, the back pressure turbines are? |
| A. | more expensive |
| B. | cheaper |
| C. | costly |
| D. | none of the mentioned |
| Answer» B. cheaper | |
| 382. |
Which of the following is a good medium for constant temperature heating? |
| A. | water |
| B. | steam |
| C. | coolant |
| D. | diesel |
| Answer» B. steam | |
| 383. |
The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by? |
| A. | nco = (wt + qi) / qh |
| B. | nco = (wt – qi) / qh |
| C. | nco = (wt + qh) / qi |
| D. | nco = (wt + qh) / qi |
| Answer» D. nco = (wt + qh) / qi | |
| 384. |
If e is the electricity fraction of the total energy output, m is the electric plant efficiency and n is the steam generator efficiency; the heat added per unit total energy output is given by? |
| A. | (1 / m) + ((1 – e) / n) |
| B. | (1 / n) + ((1 – e) / m) |
| C. | (1 / m) + ((1 + e) / n) |
| D. | (1 / n) + ((1 – e) / m) |
| Answer» A. (1 / m) + ((1 – e) / n) | |
| 385. |
Which of these is not considered economical for cogeneration? |
| A. | a high fraction of electric to total energy |
| B. | a low fraction of electric to total energy |
| C. | a low fraction of total energy to electric energy |
| D. | none of the mentioned |
| Answer» B. a low fraction of electric to total energy | |
| 386. |
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» A. direct contact heat exchanger | |
| 387. |
In vapour refrigeration cycle, which of the following is used for expansion? |
| A. | expansion engine |
| B. | throttling valve or capillary tube |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» B. throttling valve or capillary tube | |
| 388. |
Wet compression is preferred over dry compression. |
| A. | true |
| B. | false |
| C. | topic 5.1 vapour compression refrigeration cycle, effect of superheat and sub-cooling, performance calculations |
| Answer» B. false | |
| 389. |
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» A. true | |
| 390. |
Superheating of vapour and subcooling of liquid the refrigerating effect. |
| A. | decreases |
| B. | increases |
| C. | no change |
| D. | none of the mentioned |
| Answer» B. increases | |
| 391. |
A condenser must and then the compressed refrigerant. |
| A. | superheat, evaporate |
| B. | desuperheat, evaporate |
| C. | superheat, condense |
| D. | desuperheat, condense |
| Answer» D. desuperheat, condense | |
| 392. |
The vapour going to condenser is in temperature and in ammonia. |
| A. | higher, less |
| B. | higher, richer |
| C. | lower, less |
| D. | lower, richer |
| Answer» D. lower, richer | |
| 393. |
Water is used as a in air conditioning units. |
| A. | absorbent |
| B. | refrigerant |
| C. | absorbent and refrigerant |
| D. | none of the mentioned |
| Answer» B. refrigerant | |
| 394. |
Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on getting dirty? |
| A. | viscous type filters |
| B. | dry filter |
| C. | spray washers |
| D. | electric precipitators |
| Answer» B. dry filter | |
| 395. |
Select the disadvantage of cooling pond out of the given? |
| A. | the area required of cooling in a cooling pond is small |
| B. | spray losses due to evaporation and windage run high |
| C. | there is no control over the temperature of cooled water |
| D. | the cooling efficiency is low compared with cooling water |
| Answer» C. there is no control over the temperature of cooled water | |
| 396. |
How is water circulated throughout the dry cooling tower system? |
| A. | finned tubes |
| B. | metal pipes |
| C. | porous tubes |
| D. | swirling tubes |
| Answer» A. finned tubes | |
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