McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 251. |
For Full throttle valve opened condition of an S I engine |
| A. | we get less brake horse power |
| B. | we get only required brake horse power |
| C. | brake horse power is changing |
| D. | we get maximum brake horse power |
| Answer» D. we get maximum brake horse power | |
| 252. |
Air-fuel mixture required for condition of best fuel economy and maximum power is |
| A. | same at all working conditions of an engine |
| B. | same at a region close to stoichiometric conditions |
| C. | is different at all working conditions of an engine |
| D. | none of the above |
| Answer» D. none of the above | |
| 253. |
For proper working of S I engine, I . There is always combustible range II. No proper combustible range can be decided III. Richer mixture is always prepared IV. Leaner mixture is always prepared |
| A. | statements i, ii and iii are correct |
| B. | statement ii is correct |
| C. | statement i is correct |
| D. | all statements are correct |
| Answer» C. statement i is correct | |
| 254. |
For producing maximum power excess fuel burning leads to |
| A. | incomplete combustion |
| B. | more co is formed |
| C. | more co2 is formed |
| D. | both a and b |
| Answer» D. both a and b | |
| 255. |
Carburator is used to |
| A. | meter air-fuel quantity |
| B. | increase air-fuel quantity |
| C. | decrease air-fuel quantity |
| D. | mix air-fuel. |
| Answer» A. meter air-fuel quantity | |
| 256. |
Carburetor is designed |
| A. | to get easy combustion in engine |
| B. | to meter the liquid quantity to prepare the required air-fuel mixture which varies with load on engine |
| C. | it supporting device in piping |
| D. | it is a acting as a fuel and air mixer |
| Answer» B. to meter the liquid quantity to prepare the required air-fuel mixture which varies with load on engine | |
| 257. |
In S I Engine homogeneous mixture is prepared in |
| A. | combustion chamber |
| B. | intake manifold |
| C. | carburetor |
| D. | exhaust valve |
| Answer» C. carburetor | |
| 258. |
Air- fuel ratio must be changed with following conditions of an SI engine |
| A. | starting |
| B. | warm up |
| C. | acceleration |
| D. | all of the above |
| Answer» D. all of the above | |
| 259. |
Steady operating conditions of an SI engine is |
| A. | continuous operation of engine at constant speed and for constant load on engine |
| B. | continuous operation of engine at constant speed and for changing load on engine |
| C. | continuous operation of engine at changing speed and for constant load on engine |
| D. | none of the above |
| Answer» A. continuous operation of engine at constant speed and for constant load on engine | |
| 260. |
For normal power range following air fuel ratio is prefered |
| A. | 22 to 1 |
| B. | 17 to 1 |
| C. | 5 to 1 |
| D. | 2 to 1 |
| Answer» B. 17 to 1 | |
| 261. |
During cruising range of operation of SI engine throttle position is opened by |
| A. | 0 to 20% |
| B. | 20 to 78 % |
| C. | 90 % to 100% |
| D. | all the ranges are suitable |
| Answer» B. 20 to 78 % | |
| 262. |
During normal operating condition of engine load on engine shoud be |
| A. | 15% of rated load |
| B. | 90% of rated load |
| C. | 50% of rated load |
| D. | no load is applied |
| Answer» C. 50% of rated load | |
| 263. |
During maximum power requirement rich mixture provided also has advantage of |
| A. | decreasing temperature of exhaust manifold which is overheated at high load |
| B. | reducing flame temperature and the cylinder temperature |
| C. | avoids detonation because of prevention of overheating of exhaust valve |
| D. | all of the above |
| Answer» D. all of the above | |
| 264. |
Multi cylinder engines needs air-fuel ratio which is |
| A. | same as single cylinder engines |
| B. | leaner than the single cylinder engines |
| C. | richer than the single cylinder engines |
| D. | always close to stoichiometric conditions |
| Answer» C. richer than the single cylinder engines | |
| 265. |
In multi cylinder engines, cylinder close to carburetor receives |
| A. | richer mixture |
| B. | leaner mixture |
| C. | stoichiometric condition mixture |
| D. | none of the above |
| Answer» B. leaner mixture | |
| 266. |
In multi cylinder engines,cylinder away from carburetor receives |
| A. | richer mixture |
| B. | leaner mixture |
| C. | stoichiometric condition mixture |
| D. | none of the above |
| Answer» A. richer mixture | |
| 267. |
In multi cylinder engines,in all the cylinders I. Air-fuel ratio is same, II.Air-fuel ratio is different |
| A. | only i is true |
| B. | only i is false |
| C. | both i and ii are true |
| D. | none of the above |
| Answer» B. only i is false | |
| 268. |
Transient condition of SI engine is |
| A. | idling |
| B. | cruising |
| C. | starting |
| D. | maximum power range |
| Answer» C. starting | |
| 269. |
Transient condition of SI engine is I. Starting II. Acceleration III. Idling IV. Deceleration V. Warming up |
| A. | only i and ii |
| B. | only i,ii, iv and v |
| C. | only iii |
| D. | all i,ii,iii,iv and v |
| Answer» B. only i,ii, iv and v | |
| 270. |
Transient conditions in SI engine occurs because of |
| A. | evaporation of fuel is incomplete |
| B. | quantity of fuel in intake manifold may be increasing or decreasing |
| C. | distribution of fuel to various cylinders may be different |
| D. | all of the above |
| Answer» D. all of the above | |
| 271. |
Transient conditions in SI engine occurs because of |
| A. | evaporation of fuel is incomplete |
| B. | quantity of fuel in intake manifold may be increasing or decreasing |
| C. | both a and b |
| D. | none of the above |
| Answer» C. both a and b | |
| 272. |
Transient conditions in SI engine occurs because of |
| A. | more mixing of fuel and air |
| B. | quantity of fuel in intake manifold may be increasing or decreasing |
| C. | engine load is constant |
| D. | none of the above |
| Answer» B. quantity of fuel in intake manifold may be increasing or decreasing | |
| 273. |
Transient conditions in SI engine occurs because of |
| A. | cold days starting problems |
| B. | quantity of fuel in intake manifold may be increasing or decreasing |
| C. | engine load is changing |
| D. | all of the above |
| Answer» D. all of the above | |
| 274. |
Petrol is mixture of hydrocarbons having |
| A. | same boiling points |
| B. | different boiling points |
| C. | more boiling points |
| D. | none of the above |
| Answer» B. different boiling points | |
| 275. |
Petrol having high vapour pressures and low boiling points are called |
| A. | light ends |
| B. | heavy ends |
| C. | bulky ends |
| D. | low ends |
| Answer» A. light ends | |
| 276. |
Petrol fuel which is more volatile are called |
| A. | heavy ends |
| B. | more ends |
| C. | light ends |
| D. | bulky ends |
| Answer» C. light ends | |
| 277. |
When 10% of fuel is vaporised it is called |
| A. | 90 per cent point |
| B. | 10 per cent point |
| C. | any point |
| D. | 110 per cent point |
| Answer» B. 10 per cent point | |
| 278. |
During starting, richer mixture is sent through carburetor because |
| A. | it is transient condition |
| B. | it is steady condition |
| C. | it provides heavy ends of fuel in cylinder |
| D. | it provides light ends of fuel in cylinder |
| Answer» C. it provides heavy ends of fuel in cylinder | |
| 279. |
When 100% of fuel is vaporised it is called |
| A. | 100 per cent point |
| B. | 10 per cent point |
| C. | end point |
| D. | 110 per cent point |
| Answer» C. end point | |
| 280. |
During cold starting, richer mixture is provided |
| A. | because lean mixture is created in cylinder because of less vapourized fuel availability in air. |
| B. | because lean mixture is created in cylinder because of less fuel availability in air. |
| C. | because lean mixture is created in cylinder because of more air availability in same quantity of fuel. |
| D. | all of the above |
| Answer» A. because lean mixture is created in cylinder because of less vapourized fuel availability in air. | |
| 281. |
During cold starting problems |
| A. | vaporized fuel in carburetor is condensed in intake manifold, cylinder and piston top |
| B. | vaporized fuel in carburetor is condensed in intake manifold, carburetor itself |
| C. | vaporized fuel in carburetor is condensed in carburetor, cylinder and piston top |
| D. | vaporized fuel in carburetor is condensed in intake manifold, cylinder and carburetor |
| Answer» A. vaporized fuel in carburetor is condensed in intake manifold, cylinder and piston top | |
| 282. |
During cold starting problems air-fuel mixture sent to engine is |
| A. | 2 to 3 times normal amount of fuel |
| B. | 5 to 10 times normal amount of fuel |
| C. | 10 to 20 times normal amount of fuel |
| D. | 1 to 2 times normal amount of fuel |
| Answer» B. 5 to 10 times normal amount of fuel | |
| 283. |
During cold starting problems air – fuel ratio required is |
| A. | 30 to 1 |
| B. | 10 to 1 |
| C. | 3 to 1 |
| D. | 2 to 3 |
| Answer» C. 3 to 1 | |
| 284. |
Petrol engines are |
| A. | quality governed |
| B. | mechanically governed |
| C. | quantity governed |
| D. | all of the above |
| Answer» C. quantity governed | |
| 285. |
Pump which provide additional fuel quantity during acceleration is called as |
| A. | liquid pump |
| B. | vapor pump |
| C. | fuel pump |
| D. | acceleration pump |
| Answer» D. acceleration pump | |
| 286. |
During acceleraton lean mixture is reached in cylinder because |
| A. | more quantity of fuel is vaporized but not sent in cylinder during working of the cylinder |
| B. | during acceleration intake manifold is supporting the working of carburetor as more and more fuel is sent to intake manifold instantly from the carburetor |
| C. | because more fuel is consumed during acceleration and hence we send leaner mixture |
| D. | fuel lags behind in intake manifold as vaporized fuel is passed in the cylinder and more fuel is collected in intake manifold which is not vaporized during subsequent strokes as during normal working conditions of engine |
| Answer» D. fuel lags behind in intake manifold as vaporized fuel is passed in the cylinder and more fuel is collected in intake manifold which is not vaporized during subsequent strokes as during normal working conditions of engine | |
| 287. |
Acceleration term refers to |
| A. | increasing speed of engine |
| B. | increasing speed of throttle valve opening or closing |
| C. | increasing speed of choke valve opening or closing |
| D. | increasing speed of fuel flow |
| Answer» A. increasing speed of engine | |
| 288. |
Requirements of carburetor are |
| A. | to meter the liquid in such a quantity that air-fuel ratio is changed according to steady and transient working conditions of an engine |
| B. | to prepare homogeneous air-fuel mixture |
| C. | to provide rich mixture during idling and acceleration |
| D. | all of the above |
| Answer» D. all of the above | |
| 289. |
Simple carburetor doesn't have which of the following element in its arrangement |
| A. | float chamber |
| B. | auxiliary air port |
| C. | venturi |
| D. | throttle valve |
| Answer» B. auxiliary air port | |
| 290. |
Carburetor depression is a |
| A. | velocity difference |
| B. | temperature difference |
| C. | pressure difference |
| D. | none of the above |
| Answer» C. pressure difference | |
| 291. |
Pressure at throat section of venturi in simple carburetor is |
| A. | above atmospheric pressure |
| B. | atmospheric pressure |
| C. | it is any pressure |
| D. | below atmospheric pressure |
| Answer» D. below atmospheric pressure | |
| 292. |
Carburetor depression is pressure difference between |
| A. | pressure in float chamber and at float section in venturi |
| B. | pressure in float chamber and at throttle valve section in jet tube |
| C. | pressure in venturi section and at float section in venturi |
| D. | pressure in float chamber and at inlet section in jet tube |
| Answer» A. pressure in float chamber and at float section in venturi | |
| 293. |
Simple carburetor can be used for following applications |
| A. | engine running at constant speed with load varying on engine |
| B. | engine running at constant speed without load varying on engine |
| C. | engine running at varying speed without load varying on engine |
| D. | engine running at very very low speed without load varying on engine |
| Answer» B. engine running at constant speed without load varying on engine | |
| 294. |
Jet tube in simple carburetor is also called as |
| A. | choke tube |
| B. | venturi tube |
| C. | both a and b |
| D. | only a |
| Answer» C. both a and b | |
| 295. |
Nozzle lip is |
| A. | level difference between level of fuel in throttle valve and level of fuel in float chamber |
| B. | it is tip of main jet |
| C. | it is pressure difference |
| D. | level difference between level of tip of main jet and level of fuel in float chamber |
| Answer» D. level difference between level of tip of main jet and level of fuel in float chamber | |
| 296. |
Nozzle lip is provided in simple carburetor |
| A. | to avoid overflow of liquid fuel from float chamber |
| B. | to get proper working of simple carburetor |
| C. | to maintain proper vapor quantity produced in simple carburetor |
| D. | to maintain liquid level in float chamber |
| Answer» A. to avoid overflow of liquid fuel from float chamber | |
| 297. |
Minimum cross section in venturi is caleed as |
| A. | main jet area |
| B. | throat |
| C. | venturi area |
| D. | float |
| Answer» B. throat | |
| 298. |
Main suction or vacuum is created in simple carburetor at |
| A. | float chamber |
| B. | choke valve section |
| C. | throat section |
| D. | throttle valve section |
| Answer» C. throat section | |
| 299. |
Fuel quantity in the all the types of carburetors is mainly controlled with the help of which of the following device |
| A. | throat |
| B. | needle valve |
| C. | choke valve |
| D. | throttle valve |
| Answer» D. throttle valve | |
| 300. |
Which of the following device is directly connected to accelerator in vehicle |
| A. | throttle valve |
| B. | throat |
| C. | needle valve |
| D. | choke valve |
| Answer» A. throttle valve | |
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