MCQOPTIONS
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MCQOPTIONS
This section includes 564 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
With increase in load, convection superheater has |
| A. | Drooping characteristic |
| B. | Linear characteristic |
| C. | Rising characteristic |
| D. | Flat characteristic |
| Answer» D. Flat characteristic | |
| 302. |
The state of vapor under saturation condition is described by |
| A. | Pressure alone |
| B. | Temperature alone |
| C. | Pressure and temperature |
| D. | Pressure and dryness fraction |
| Answer» E. | |
| 303. |
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 | |
| 304. |
Sulphur in coal results in |
| A. | Corroding air heaters |
| B. | Spontaneous combustion during coal storage |
| C. | Facilitating ash precipitation |
| D. | All of the above |
| Answer» E. | |
| 305. |
Benson boiler requires |
| A. | No drum |
| B. | One drum |
| C. | Two drums |
| D. | Three drums |
| Answer» B. One drum | |
| 306. |
Efficiency of Rankine cycle can be increased by |
| A. | Decreasing initial steam pressure and temperature |
| B. | Increasing exhaust pressure |
| C. | Decreasing exhausts pressure |
| D. | Increasing the expansion ratio |
| Answer» B. Increasing exhaust pressure | |
| 307. |
The fire tubes in, a Coarran and Scottish marine boiler are |
| A. | Horizontal |
| B. | Vertical |
| C. | Inclined |
| D. | Both horizontal and vertical |
| Answer» B. Vertical | |
| 308. |
A steam nozzle converts |
| A. | Heat energy of steam into kinetic energy |
| B. | Kinetic energy into heat energy of steam |
| C. | Heat energy of steam into potential energy |
| D. | Potential energy into heat energy of steam |
| Answer» B. Kinetic energy into heat energy of steam | |
| 309. |
The basic purpose of drum in boiler is to |
| A. | Serve as storage of steam |
| B. | Serve as storage of feed water for water wall |
| C. | Remove salts from water |
| D. | Separate steam from water |
| Answer» E. | |
| 310. |
The Locomotive boiler has |
| A. | 137 fire tubes and 44 superheated tubes |
| B. | 147 fire tubes and 34 superheated tubes |
| C. | 157 fire tubes and 24 superheated tubes |
| D. | 167 fire tubes and 14 superheated tubes |
| Answer» D. 167 fire tubes and 14 superheated tubes | |
| 311. |
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 | |
| 312. |
The diameters of fire tubes and superheater tubes in locomotive boiler are |
| A. | 47.5 mm, 130 mm |
| B. | 32.5 mm, 180 mm |
| C. | 65.5 mm, 210 mm |
| D. | 24.5 mm, 65 mm |
| Answer» B. 32.5 mm, 180 mm | |
| 313. |
Which is not the correct statement about moisture in coal? |
| A. | Inherent moisture and surface moisture are different things |
| B. | In some coals moisture may be present up to 40% |
| C. | Some moisture in coal helps in better burning which is not possible with completely dry coal |
| D. | It increases thermal efficiency |
| Answer» E. | |
| 314. |
A device used to heat feed water by utilizing the heat in me exhaust flue gases before leaving through the chimney, is known as |
| A. | Economizer |
| B. | Fusible plug |
| C. | Superheater |
| D. | Stop valve |
| Answer» B. Fusible plug | |
| 315. |
All steam engines work on |
| A. | Zeroth law of thermodynamics |
| B. | First law of thermodynamics |
| C. | Second law of thermodynamics |
| D. | None of these |
| Answer» D. None of these | |
| 316. |
An economiser is generally placed between |
| A. | Last superheater or reheater and air preheater |
| B. | Induced draft fan and forced draft fan |
| C. | Air preheater and chimney |
| D. | None of the above |
| Answer» B. Induced draft fan and forced draft fan | |
| 317. |
Which of the following substance will have same percentage in both proximate and ultimate analysis? |
| A. | Ash |
| B. | Volatile matter |
| C. | Moisture |
| D. | Hydrogen |
| Answer» B. Volatile matter | |
| 318. |
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the |
| A. | Blades are equiangular |
| B. | Blade velocity coefficient is unity |
| C. | Blades are equiangular and frictionless |
| D. | Blade solidity is 0.65 |
| Answer» D. Blade solidity is 0.65 | |
| 319. |
Maximum energy loss in a boiler occurs due to |
| A. | Unburnt carbon in ash |
| B. | Incomplete combustion |
| C. | Ash content |
| D. | Flue gases |
| Answer» E. | |
| 320. |
The maximum heat loss is a boiler occurs due to |
| A. | Moisture in fuel |
| B. | Dry flue gases |
| C. | Steam formation |
| D. | Unburnt carbon |
| Answer» C. Steam formation | |
| 321. |
The maximum steam pressure in a Locomotive boiler is limited to |
| A. | 0.18 MN/m² |
| B. | 1.8 MN/m² |
| C. | 18 MN/m² |
| D. | 180 MN/m² |
| Answer» C. 18 MN/m² | |
| 322. |
The efficiency of a boiler is defined as |
| A. | Ratio of heat actually used in producing steam to the heat liberated in the furnace |
| B. | Ratio of the mass of steam produced to the mass of total water supplied in a given time |
| C. | Ratio of the heat liberated in the furnace to the heat actually used in producing steam |
| D. | None of the above |
| Answer» B. Ratio of the mass of steam produced to the mass of total water supplied in a given time | |
| 323. |
The flow through a nozzle is regarded as |
| A. | Constant volume flow |
| B. | Constant pressure flow |
| C. | Isothermal flow |
| D. | Isentropic flow |
| Answer» E. | |
| 324. |
The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Could be more or less depending on other factors |
| Answer» B. Less | |
| 325. |
Pick up the correct statement as regards Cornish boiler and Lancashire boiler |
| A. | Cornish is fire tube and Lancashire is water tube |
| B. | Cornish is water tube and Lancashire is fire tube |
| C. | Cornish has two fire tubes and Lancashire has one |
| D. | Lancashire has two fire tubes and Cornish has one |
| Answer» E. | |
| 326. |
The amount of water evaporated in kg per kg of fuel burnt is called |
| A. | Evaporative capacity of a boiler |
| B. | Equivalent evaporation from and at 100° C |
| C. | Boiler efficiency |
| D. | None of these |
| Answer» B. Equivalent evaporation from and at 100° C | |
| 327. |
Thermal efficiency of well maintained boiler will be of the order |
| A. | 40 % |
| B. | 50 % |
| C. | 75 % |
| D. | 90 % |
| Answer» E. | |
| 328. |
A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly |
| A. | 150 kg/h |
| B. | 210 kg/h |
| C. | 280 kg/h |
| D. | 340 kg/h |
| Answer» E. | |
| 329. |
Coke is produced by |
| A. | Pulverizing coal in inert atmosphere |
| B. | Heating wood in a limited supply of air at temperatures below 300°C |
| C. | Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel |
| D. | Enriching carbon in the coal |
| Answer» D. Enriching carbon in the coal | |
| 330. |
Which is not correct statement about pulverized fuel firing? |
| A. | High burning rate is possible |
| B. | Heat release can be easily controlled |
| C. | Fuel burns economically |
| D. | It is the best technique for burning high ash content fuel having low fusion ash |
| Answer» E. | |
| 331. |
Stoichiometric quantity of air is the |
| A. | Air present in atmosphere at NTP conditions |
| B. | Air required for complete combustion of fuel with no excess air |
| C. | Air required for optimum combustion so as to have reasonable excess air |
| D. | Air required to convert CO into CO₂ |
| Answer» C. Air required for optimum combustion so as to have reasonable excess air | |
| 332. |
The function of injector used in small capacity boilers is to |
| A. | Create vacuum |
| B. | Inject chemical solution in feed pump |
| C. | Pump water, similar to boiler feed pump |
| D. | Add make up water in the system |
| Answer» D. Add make up water in the system | |
| 333. |
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet) |
| A. | Vb = 0.5 V cosα |
| B. | Vb = V cos α |
| C. | Vb = 0.5 V² cosα |
| D. | Vb = V² cos α |
| Answer» C. Vb = 0.5 V² cosα | |
| 334. |
The impulse reaction turbine has its driving force |
| A. | As an impulsive force |
| B. | As a reaction force |
| C. | Partly as an impulsive force and partly as a reaction force |
| D. | None of the above |
| Answer» D. None of the above | |
| 335. |
When the inlet pressure of steam is equal to the exit pressure, then |
| A. | There is a pressure drop in the nozzle |
| B. | Fluid flows through the nozzle |
| C. | Pressure drops and fluid flows through the nozzle |
| D. | There is no pressure drop and fluid does not flow through the nozzle |
| Answer» E. | |
| 336. |
Carbonization of coal is the process of |
| A. | Pulverizing coal in inert atmosphere |
| B. | Heating wood in a limited supply of air at temperatures below 300°C |
| C. | Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel |
| D. | Binding the pulverized coal into briquettes |
| Answer» D. Binding the pulverized coal into briquettes | |
| 337. |
At very low temperature, the melting and boiling temperatures become equal. This temperature is |
| A. | 373°K |
| B. | 273.16°K |
| C. | 303°K |
| D. | 0°K |
| Answer» C. 303°K | |
| 338. |
A stage, in reaction turbine, is represented by |
| A. | Number of casing |
| B. | Number of entries of steam |
| C. | Number of exits of steam |
| D. | Each row of blades |
| Answer» E. | |
| 339. |
On Mollier chart, flow through turbine is represented by |
| A. | Horizontal straight line |
| B. | Vertical straight line |
| C. | Straight inclined line |
| D. | Curved line |
| Answer» C. Straight inclined line | |
| 340. |
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by |
| A. | Horizontal straight line |
| B. | Vertical straight line |
| C. | Straight inclined line |
| D. | Curved line |
| Answer» B. Vertical straight line | |
| 341. |
The indicated thermal efficiency is defined as the |
| A. | Ratio of thermal efficiency to the Rankine efficiency |
| B. | Ratio of brake power to the indicated power |
| C. | Ratio of heat equivalent to indicated power to the energy supplied in steam |
| D. | Product of thermal efficiency and Rankine efficiency |
| Answer» D. Product of thermal efficiency and Rankine efficiency | |
| 342. |
The relative efficiency is defined as the |
| A. | Ratio of thermal efficiency to Rankine efficiency |
| B. | Ratio of brake power to the indicated power |
| C. | Ratio of heat equivalent to indicated power to the energy supplied in steam |
| D. | Product of thermal efficiency and Rankine efficiency |
| Answer» B. Ratio of brake power to the indicated power | |
| 343. |
Boiler H.P. is defined as the |
| A. | Steam evaporation rate per kg of fuel fired |
| B. | Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam |
| C. | The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam |
| D. | Work done by 1 kg of steam at saturation condition |
| Answer» D. Work done by 1 kg of steam at saturation condition | |
| 344. |
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as |
| A. | Blow off cock |
| B. | Fusible plug |
| C. | Superheater |
| D. | Stop valve |
| Answer» E. | |
| 345. |
The process of maintaining the speed of the turbine constant for various load conditions, is known as |
| A. | Bleeding |
| B. | Reheating |
| C. | Governing |
| D. | None of these |
| Answer» D. None of these | |
| 346. |
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 per kg of fuel burnt |
| C. | The amount of water evaporated from and at 100°C into dry and saturated steam |
| D. | The evaporation of 15.653 kg of water per hour from and at 100°C |
| Answer» D. The evaporation of 15.653 kg of water per hour from and at 100°C | |
| 347. |
During storage, the heating value of coal |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | May increase or decrease depending upon the method of storage |
| Answer» C. Remain constant | |
| 348. |
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. | |
| 349. |
A nozzle is said to be a divergent nozzle |
| A. | When the cross-section of the nozzle increases continuously from entrance to exit |
| B. | When the cross-section of the nozzle decreases continuously from entrance to exit |
| C. | When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit |
| D. | None of the above |
| Answer» B. When the cross-section of the nozzle decreases continuously from entrance to exit | |
| 350. |
Which of the following boiler is best suited to meet the fluctuating demand of steam? |
| A. | Locomotive boiler |
| B. | Lancashire boiler |
| C. | Cornish boiler |
| D. | Babcock and Wilcox boiler |
| Answer» B. Lancashire boiler | |