MCQOPTIONS
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MCQOPTIONS
This section includes 760 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. |
*/*_In fire tube boilers? |
| A. | Water passes through the tubes which are surrounded by flames and hot gases |
| B. | The flames and hot gases pass through the tubes which are surrounded by water |
| C. | Forced circulation takes place |
| D. | None of these |
| Answer» C. Forced circulation takes place | |
| 352. |
*/*_The condition of steam in boiler drum is always? |
| A. | Dry |
| B. | Wet |
| C. | Saturated |
| D. | Supersaturated |
| Answer» C. Saturated | |
| 353. |
*/*_A device used to increase the temperature of saturated steam without raising its pressure, is called? |
| A. | Blow off cock |
| B. | Fusible plug |
| C. | Superheater |
| D. | Stop valve |
| Answer» D. Stop valve | |
| 354. |
*/*_The ratio of heat utilized to produce steam and the heat liberated in furnace is known as? |
| A. | Boiler effectiveness |
| B. | Boiler evaporative capacity |
| C. | Factor of evaporation |
| D. | Boiler efficiency |
| Answer» E. | |
| 355. |
*/*_The crown of the fire box is made hemispherical in order to? |
| A. | Give maximum space |
| B. | Give maximum strength |
| C. | Withstand pressure inside boiler |
| D. | Resist intense heat in fire box |
| Answer» E. | |
| 356. |
*/*_The saturation temperature of steam with increase in pressure increases? |
| A. | Linearly |
| B. | Rapidly first and then slowly |
| C. | Slowly first and then rapidly |
| D. | Inversely |
| Answer» C. Slowly first and then rapidly | |
| 357. |
*/*_In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 358. |
*/*_Water tube boilers are those in which? |
| A. | Flue gases pass through tubes and water around it |
| B. | Water passes through the tubes and flue gases around it |
| C. | Work is done during adiabatic expansion |
| D. | Change in enthalpy |
| Answer» D. Change in enthalpy | |
| 359. |
*/*_A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as? |
| A. | Steam condenser |
| B. | Steam boiler |
| C. | Steam preheater |
| D. | Economiser |
| Answer» B. Steam boiler | |
| 360. |
*/*_The compounding of turbines is done in order to? |
| A. | Reduce speed of rotor |
| B. | Improve efficiency |
| C. | Reduce exit losses |
| D. | All of these |
| Answer» E. | |
| 361. |
*/*_The rate of steam produced in Benson boiler is? |
| A. | 100 tonnes/h |
| B. | 135 tonnes/h |
| C. | 175 tonnes/h |
| D. | 250 tonnes/h |
| Answer» C. 175 tonnes/h | |
| 362. |
*/*_The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks? |
| A. | 180° to each other |
| B. | 90° to each other |
| C. | 0° to each other |
| D. | None of these |
| Answer» C. 0¬¨‚àû to each other | |
| 363. |
*/*_By compounding the expansion of steam in two or more cylinders, the length of stroke? |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» D. None of these | |
| 364. |
*/*_One kilowatt-hour energy is equivalent to? |
| A. | 1000 J |
| B. | 360 kJ |
| C. | 3600 kJ |
| D. | 3600 kW/sec |
| Answer» D. 3600 kW/sec | |
| 365. |
*/*_The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.? |
| A. | Same |
| B. | Less |
| C. | More |
| D. | None of these |
| Answer» C. More | |
| 366. |
*/*_A supercritical boiler is one that operates above the pressure and temperature of following values? |
| A. | 100 kg/cm² and 540°C |
| B. | 1 kg/cm² and 100°C |
| C. | 218 kg/cm² abs and 373°C |
| D. | 218 kg/cm² abs and 540°C |
| Answer» D. 218 kg/cm¬¨‚⧠abs and 540¬¨‚àûC | |
| 367. |
*/*_The reheat factor is the ratio of the? |
| A. | Cumulative heat drop to the isentropic heat drop |
| B. | Isentropic heat drop to the heat supplied |
| C. | Total useful heat drop to the total isentropic heat drop |
| D. | None of the above |
| Answer» B. Isentropic heat drop to the heat supplied | |
| 368. |
*/*_Which is not correct statement about effect of sulphur in fuel?? |
| A. | It has heating value |
| B. | It helps in electrostatic precipitation of ash in flue gases |
| C. | It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low |
| D. | It erodes furnace walls |
| Answer» E. | |
| 369. |
*/*_Expanding steam to a very low pressure (high vacuum) in steam engines is? |
| A. | Desirable |
| B. | Economical |
| C. | Essential |
| D. | Uneconomical |
| Answer» E. | |
| 370. |
*/*_The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.? |
| A. | 10 to 15% |
| B. | 15 to 20% |
| C. | 20 to 30% |
| D. | 30 to 40% |
| Answer» B. 15 to 20% | |
| 371. |
*/*_A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be? |
| A. | 79 m/s |
| B. | 188 m/s |
| C. | 450 m/s |
| D. | 900 m/s |
| Answer» D. 900 m/s | |
| 372. |
*/*_The effect of friction in the nozzle __________ dryness fraction of steam.? |
| A. | Has no effect on |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 373. |
*/*_The ratio of the isentropic heat drop to the heat supplied, is called? |
| A. | Reheat factor |
| B. | Stage efficiency |
| C. | Internal efficiency |
| D. | Rankine efficiency |
| Answer» E. | |
| 374. |
*/*_The specific volume of steam with increase in pressure decreases? |
| A. | Linearly |
| B. | Slowly first and then rapidly |
| C. | Rapidly first and then slowly |
| D. | Inversely |
| Answer» D. Inversely | |
| 375. |
*/*_The safety valve on boiler drum compared to safety valve on superheater is set at? |
| A. | Same value |
| B. | Higher value |
| C. | Lower value |
| D. | Lower/higher depending on steam flow |
| Answer» C. Lower value | |
| 376. |
*/*_Fire tube boilers are limited to a maximum design working pressure of? |
| A. | 1 kg/cm |
| B. | 6 kg/cm |
| C. | 17 kg/cm² |
| D. | 100 kg/cm² |
| Answer» D. 100 kg/cm¬¨‚⧠| |
| 377. |
*/*_Boilers, Engines, Nozzles and Turbines Objective Questions and Answers pdf:- 101. The difference between cornish boiler and lancashire boiler is that? |
| A. | former is fire tube type and latter is water tube type boiler |
| B. | former is water tube type and latter is fire tube type |
| C. | former contains one fire tube and latter contains two fire tubes |
| D. | none of the above |
| Answer» D. none of the above | |
| 378. |
*/*_The latent heat of steam with increase of pressure? |
| A. | Remain same |
| B. | Increases |
| C. | Decreases |
| D. | Behaves unpredictably |
| Answer» D. Behaves unpredictably | |
| 379. |
*/*_Equivalent evaporation of water is the evaporation for a feed water supply at 100°C? |
| A. | And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm² |
| B. | And its corresponding conversion into dry steam at desired boiler pressure |
| C. | Conversion into steam at atmospheric condition |
| D. | Conversion into steam at the same pressure at which feed water is supplied |
| Answer» B. And its corresponding conversion into dry steam at desired boiler pressure | |
| 380. |
*/*_Sulphur content of fuels is very important to the plant operators because it? |
| A. | Has high heating value |
| B. | Retards electric precipitation |
| C. | Promotes complete combustion |
| D. | Has highly corrosive effect |
| Answer» E. | |
| 381. |
*/*_The shell diameter and length of locomotive boiler are? |
| A. | 1.5 m, 4 m |
| B. | 1.5 m, 6 m |
| C. | 1 m, 4 m |
| D. | 2 m, 4 m |
| Answer» B. 1.5 m, 6 m | |
| 382. |
*/*_In an impulse turbine? |
| A. | The steam is expanded in nozzles only and there is a pressure drop and heat drop |
| B. | The steam is expanded both in fixed and moving blades continuously |
| C. | The steam is expanded in moving blades only |
| D. | The pressure and temperature of steam remains constant |
| Answer» B. The steam is expanded both in fixed and moving blades continuously | |
| 383. |
*/*_The balanced draft furnace is one using? |
| A. | Induced draft fan and chimney |
| B. | Induced draft fan and forced draft fan |
| C. | Forced draft fan and chimney |
| D. | Any one of the above |
| Answer» C. Forced draft fan and chimney | |
| 384. |
*/*_In an impulse turbine, steam expands? |
| A. | Wholly in blades |
| B. | Wholly in nozzle |
| C. | Partly in the nozzle and partly in blades |
| D. | None of these |
| Answer» C. Partly in the nozzle and partly in blades | |
| 385. |
*/*_Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?? |
| A. | A steam turbine develops higher speeds |
| B. | The efficiency of steam turbine is higher |
| C. | The steam consumption is less |
| D. | All of these |
| Answer» E. | |
| 386. |
*/*_The forced circulation of water does not take place in? |
| A. | LaMont boiler |
| B. | Lancashire boiler |
| C. | Velox boiler |
| D. | Benson boiler |
| Answer» C. Velox boiler | |
| 387. |
*/*_Clearance ratio is the ratio of? |
| A. | Clearance volume to the swept volume |
| B. | Clearance volume to the volume at cut-off |
| C. | Volume at cut-off to the swept volume |
| D. | Swept volume to the clearance volume |
| Answer» B. Clearance volume to the volume at cut-off | |
| 388. |
*/*_The three "Ts" for good combustion are? |
| A. | Temperature, time, and turbulence |
| B. | Total air, true fuel, and turbulence |
| C. | Thorough mixing, total air and temperature |
| D. | Total air, time, and temperature |
| Answer» B. Total air, true fuel, and turbulence | |
| 389. |
*/*_Caking coals are those which? |
| A. | Form lumps or masses of coke |
| B. | Burn freely |
| C. | Show little or no fusing action |
| D. | Burn completely |
| Answer» B. Burn freely | |
| 390. |
*/*_Thermal efficiency of a thermal power plant is of the order of? |
| A. | 15 % |
| B. | 20 % |
| C. | 30 % |
| D. | 45 % |
| Answer» D. 45 % | |
| 391. |
*/*_Tertiary air is the air used to? |
| A. | Provide air around burners for obtaining optimum combustion |
| B. | Transport and dry the coal |
| C. | Cool the scanners |
| D. | Convert CO (formed in lower zone of furnace) into CO‚ÇÇ at higher zone |
| Answer» E. | |
| 392. |
*/*_The critical pressure at which latent heat of vaporisation is zero is? |
| A. | 225.65 kgf/ cm² |
| B. | 273 kgf/ cm² |
| C. | 100 kgf/ cm² |
| D. | 1 kgf/ cm² |
| Answer» B. 273 kgf/ cm¬¨‚⧠| |
| 393. |
*/*_In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p‚ÇÇ) will be? |
| A. | 3.3 bar |
| B. | 5.46 bar |
| C. | 8.2 bar |
| D. | 9.9 bar |
| Answer» C. 8.2 bar | |
| 394. |
*/*_The ratio of brake power to the indicated power is known as? |
| A. | Mechanical efficiency |
| B. | Overall efficiency |
| C. | Indicated thermal efficiency |
| D. | Brake thermal efficiency |
| Answer» B. Overall efficiency | |
| 395. |
*/*_In a nozzle, whole frictional loss is assumed to occur between? |
| A. | Inlet and throat |
| B. | Inlet and outlet |
| C. | Throat and exit |
| D. | All of these |
| Answer» D. All of these | |
| 396. |
*/*_An economiser _________ the steam raising capacity of a boiler.? |
| A. | Increases |
| B. | Decreases |
| C. | Has no effect on |
| D. | None of these |
| Answer» B. Decreases | |
| 397. |
*/*_The effect of friction on the flow of steam through a nozzle is to? |
| A. | Decrease the mass flow rate and to increase the wetness of steam |
| B. | Increase the mass flow rate and to increase the exit temperature |
| C. | Decrease the mass flow rate and to decrease the wetness of steam |
| D. | Increase the exit temperature without any effect on mass flow rate |
| Answer» D. Increase the exit temperature without any effect on mass flow rate | |
| 398. |
*/*_Orsat meter is used for? |
| A. | Gravimetric analysis of the flue gases |
| B. | Volumetric analysis of the flue gases |
| C. | Mass flow of the flue gases |
| D. | Measuring smoke density of flue gases |
| Answer» C. Mass flow of the flue gases | |
| 399. |
*/*_Reheating of steam under ideal conditions takes place at constant? |
| A. | Entropy |
| B. | Enthalpy |
| C. | Pressure |
| D. | Temperature |
| Answer» E. | |
| 400. |
*/*_The proximate analysis of fuel lists? |
| A. | Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume |
| B. | Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight |
| C. | Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash |
| D. | Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash |
| Answer» E. | |