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.
| 251. |
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle) |
| A. | Remains constant |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» B. Decreases | |
| 252. |
The diameter of superheated tubes in a locomotive boiler is |
| A. | 13 mm |
| B. | 31 mm |
| C. | 130 mm |
| D. | 230 mm |
| Answer» D. 230 mm | |
| 253. |
The length of shell of a Locomotive boiler is |
| A. | 1 m |
| B. | 2 m |
| C. | 3 m |
| D. | 4 m |
| Answer» E. | |
| 254. |
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C. |
| A. | 0°C |
| B. | 40°C |
| C. | 60°C |
| D. | 100°C |
| Answer» E. | |
| 255. |
During polytropic process |
| A. | Heat transfer takes place across cylinder walls |
| B. | Work is done |
| C. | Steam may be wet, dry or superheated after expansion |
| D. | All of the above |
| Answer» E. | |
| 256. |
The fusible plug in small boilers is located |
| A. | In the drum |
| B. | In the fire tubes |
| C. | Above steam dome |
| D. | Over the combustion chamber |
| Answer» E. | |
| 257. |
The diameter of a cylindrical shell of a Scotch marine boiler varies from |
| A. | 1.5 to 2 m |
| B. | 2.5 to 3.5 m |
| C. | 3.5 to 4.5 m |
| D. | None of these |
| Answer» C. 3.5 to 4.5 m | |
| 258. |
The length of Cornish boiler varies from |
| A. | 2 to 4.5 m |
| B. | 3 to 5 m |
| C. | 5 to 7.5 m |
| D. | 7 to 9 m |
| Answer» D. 7 to 9 m | |
| 259. |
The length of Lancashire boiler varies from |
| A. | 5 to 6 m |
| B. | 6 to 7 m |
| C. | 7.25 to 9 m |
| D. | 9 to 10 m |
| Answer» D. 9 to 10 m | |
| 260. |
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as |
| A. | Regenerative heating |
| B. | Reheating of steam |
| C. | Bleeding |
| D. | None of these |
| Answer» D. None of these | |
| 261. |
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as |
| A. | Internally fired boiler |
| B. | Externally fired boiler |
| C. | Natural circulation boiler |
| D. | Forced circulation boiler |
| Answer» D. Forced circulation boiler | |
| 262. |
Equivalent evaporation is the amount of water evaporated in a boiler from and at |
| A. | 0°C |
| B. | 100°C |
| C. | Saturation temperature at given pressure |
| D. | Room temperature |
| Answer» C. Saturation temperature at given pressure | |
| 263. |
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades, |
| A. | Velocity increases |
| B. | Velocity decreases |
| C. | Velocity remains constant |
| D. | Pressure remains constant |
| Answer» C. Velocity remains constant | |
| 264. |
The function of a valve rod is |
| A. | To provide reciprocating motion to the slide valve |
| B. | To convert reciprocating motion of the piston into rotary motion of the crank |
| C. | To convert rotary motion of the crankshaft into to and fro motion of the valve rod |
| D. | To provide simple harmonic motion to the D-slide valve |
| Answer» E. | |
| 265. |
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 | |
| 266. |
The numbers of fire tubes in a Cochran boiler are |
| A. | 75 |
| B. | 115 |
| C. | 165 |
| D. | 225 |
| Answer» D. 225 | |
| 267. |
Cut-off ratio is the ratio of |
| A. | Swept volume to the volume at cut-off |
| B. | Volume at cut-off to the clearance volume |
| C. | Volume at cut-off to the swept volume |
| D. | Clearance volume to the volume at cut-off |
| Answer» D. Clearance volume to the volume at cut-off | |
| 268. |
Expansion ratio is the ratio of |
| A. | Swept volume to the volume at cut-off |
| B. | Clearance volume to the swept volume |
| C. | Volume at cut-off to the swept volume |
| D. | Swept volume to the clearance volume |
| Answer» B. Clearance volume to the swept volume | |
| 269. |
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 | |
| 270. |
Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will |
| A. | Boil |
| B. | Flash i.e. get converted into steam |
| C. | Remain as it was |
| D. | Cool down |
| Answer» C. Remain as it was | |
| 271. |
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages. |
| A. | Same |
| B. | Less |
| C. | More |
| D. | None of these |
| Answer» D. None of these | |
| 272. |
On Millier chart, the constant pressure lines |
| A. | Diverge from left to right |
| B. | Diverge from right to left |
| C. | Are equally spaced throughout |
| D. | First rise up and then fall |
| Answer» B. Diverge from right to left | |
| 273. |
The height of chimney in a power plant is governed by |
| A. | The draft to be created |
| B. | Limitation of construction facilities |
| C. | Control of pollution |
| D. | Quantity of flue gases to be handled |
| Answer» D. Quantity of flue gases to be handled | |
| 274. |
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 | |
| 275. |
The pressure of reheat steam after passing through reheater compared to inlet condition is |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | May be more or less depending on capacity of reheater |
| Answer» C. Equal | |
| 276. |
The actual power supplied by the engine crankshaft is called |
| A. | Indicated power |
| B. | Brake power |
| C. | Frictional power |
| D. | None of these |
| Answer» C. Frictional power | |
| 277. |
Steam engine operates on |
| A. | Carnot cycle |
| B. | Joule cycle |
| C. | Stirling cycle |
| D. | Brayton cycle |
| Answer» E. | |
| 278. |
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/cm² abs and 540°C | |
| 279. |
Thermal equilibrium means that the flow of steam is |
| A. | Isothermal |
| B. | Isentropic |
| C. | Hyperbolic |
| D. | Polytropic |
| Answer» C. Hyperbolic | |
| 280. |
Steam in water tube boiler as compared to fire tube boiler |
| A. | Can be raised rapidly |
| B. | Is raised at slower rate |
| C. | Is raised at same rate |
| D. | Could be raised at fast/slow rate depending on design |
| Answer» B. Is raised at slower rate | |
| 281. |
The function of an eccentric rod is |
| A. | To provide reciprocating motion to the slide valve |
| B. | To convert reciprocating motion of the piston into rotary motion of the crank |
| C. | To convert rotary motion of the crankshaft into to and fro motion of the valve rod |
| D. | To provide simple harmonic motion to the D-slide valve |
| Answer» D. To provide simple harmonic motion to the D-slide valve | |
| 282. |
Fusible plug for boilers is made of fusible metal containing tin, lead, and |
| A. | Bismuth |
| B. | Copper |
| C. | Aluminium |
| D. | Nickel |
| Answer» B. Copper | |
| 283. |
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. | |
| 284. |
A safety valve in a locomotive starts leaking. The leaking medium will be |
| A. | Water |
| B. | Dry steam |
| C. | Wet steam |
| D. | Super heated steam |
| Answer» E. | |
| 285. |
Heating wet steam at constant temperature is heating it at constant |
| A. | Volume |
| B. | Pressure |
| C. | Entropy |
| D. | Enthalpy |
| Answer» C. Entropy | |
| 286. |
Which of the following is steam dial? |
| A. | Non-coking bituminous coal |
| B. | Brown coal |
| C. | Pulverized coal |
| D. | Coking bituminous coal |
| Answer» B. Brown coal | |
| 287. |
An economiser in a boiler |
| A. | Increases steam pressure |
| B. | Increases steam flow |
| C. | Decreases fuel consumption |
| D. | Decreases steam pressure |
| Answer» D. Decreases steam pressure | |
| 288. |
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 | |
| 289. |
The basic job of feed water treatment in boilers is to overcome the problem of |
| A. | Corrosion |
| B. | Scale |
| C. | Carryover |
| D. | All of the above |
| Answer» E. | |
| 290. |
The cylinder condensation or missing quantity may be reduced by |
| A. | The efficient steam jacketing of the cylinder walls |
| B. | Superheating the steam supplied to the engine cylinder |
| C. | Keeping the expansion ratio small in each cylinder |
| D. | All of the above |
| Answer» E. | |
| 291. |
The power of a boiler may be 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» C. The amount of water evaporated from and at 100° C into dry and saturated steam | |
| 292. |
An ideal regenerative cycle is |
| A. | Equal to Carnot cycle |
| B. | Less than Carnot cycle |
| C. | More than Carnot cycle |
| D. | Could be anything |
| Answer» C. More than Carnot cycle | |
| 293. |
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 | |
| 294. |
Steam exhaust from high pressure turbine is reheated in |
| A. | Boiler drums |
| B. | Superheater tubes |
| C. | Economizer |
| D. | A separate coil located in convection path |
| Answer» E. | |
| 295. |
In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure. |
| A. | Equal to |
| B. | Lower than |
| C. | Higher than |
| D. | None of these |
| Answer» D. None of these | |
| 296. |
The ratio of the actual vacuum to the ideal vacuum in a condenser is called |
| A. | Condenser efficiency |
| B. | Vacuum efficiency |
| C. | Nozzle efficiency |
| D. | Boiler efficiency |
| Answer» C. Nozzle efficiency | |
| 297. |
The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as |
| A. | Equivalent evaporation |
| B. | Factor of evaporation |
| C. | Boiler efficiency |
| D. | Power of a boiler |
| Answer» D. Power of a boiler | |
| 298. |
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 | |
| 299. |
O₂ content in atmospheric air on weight basis is |
| A. | 21 % |
| B. | 23 % |
| C. | 30 % |
| D. | 40 % |
| Answer» C. 30 % | |
| 300. |
O₂ content in atmospheric air on volume basis is |
| A. | 21 % |
| B. | 23 % |
| C. | 30 % |
| D. | 40 % |
| Answer» B. 23 % | |