McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 301. |
During cold starting problems in winter seasons in india |
| A. | throat section is closed |
| B. | choke valve is closed |
| C. | throttle valve is closed |
| D. | main jet is closed |
| Answer» B. choke valve is closed | |
| 302. |
Pressure at the throat at fully open position of throttle condition lies in between |
| A. | 1 to 2 mm hg below atmospheric pressure |
| B. | 10 to 20 mm hg below atmospheric pressure |
| C. | 4 to 5 mm hg below atmospheric pressure |
| D. | 0.5 to 2 mm hg below atmospheric pressure |
| Answer» C. 4 to 5 mm hg below atmospheric pressure | |
| 303. |
Throttle valve is placed on which side of venturi |
| A. | on atmospheric air side |
| B. | at venturi |
| C. | before venturi |
| D. | after venturi |
| Answer» D. after venturi | |
| 304. |
At high speed of engine and for fully open position of throttle valve. |
| A. | more air-fuel mixture it send to cylinder. |
| B. | less air-fuel mixture it send to cylinder. |
| C. | more air mixture it send to cylinder. |
| D. | less fuel mixture it send to cylinder. |
| Answer» A. more air-fuel mixture it send to cylinder. | |
| 305. |
Drawbacks of simple carborator are |
| A. | it provides richest mixture when speed engine is high. |
| B. | it provides leanest mixture when speed engine is less. |
| C. | both a&b |
| D. | none of the above. |
| Answer» C. both a&b | |
| 306. |
In case of simple carburetor for high speed engines too rich mixture is created because of following reason |
| A. | more vacuum at throttle section |
| B. | less air from atmosphere |
| C. | less vacuum at throat |
| D. | too high vacuum at throat |
| Answer» D. too high vacuum at throat | |
| 307. |
In the simple carburetor which of the following modification is necessory for increasing air flow to compenset for rich mixture |
| A. | compensating jet |
| B. | emulsion tube |
| C. | back suction control |
| D. | all of the above |
| Answer» D. all of the above | |
| 308. |
During idling condition of SI engine mixtue is diluted because of exhaust gases presence in cylinder, so fuel is provided in venturi tube |
| A. | at throat section because of suction created at that point |
| B. | after throttle valve because of suction created at that point |
| C. | after throat section because of suction created at that point |
| D. | after choke valve because of suction created at that point |
| Answer» B. after throttle valve because of suction created at that point | |
| 309. |
Idle adjust in idling arrangement is used mainly to control the |
| A. | petrol bleed |
| B. | fuel bleed |
| C. | air bleed |
| D. | mixture bleed |
| Answer» C. air bleed | |
| 310. |
__________ is the process of preparation of mixture of fuel and air before admission to cylinder. |
| A. | mixing |
| B. | carburettion |
| C. | evaporation |
| D. | condensation |
| Answer» B. carburettion | |
| 311. |
Which of the following is not the part of fuel induction system. |
| A. | fuel filter and fuel pump |
| B. | carburettor |
| C. | throttle valve |
| D. | spark plug |
| Answer» D. spark plug | |
| 312. |
The function of carburettor is, |
| A. | to control a:f ratio |
| B. | to control amount of mixture |
| C. | to control both a and b |
| D. | none of the above |
| Answer» D. none of the above | |
| 313. |
The function of carburettor is to control, |
| A. | speed |
| B. | a:f ratio |
| C. | a:f ratio and quantity of mixture |
| D. | none of the above |
| Answer» D. none of the above | |
| 314. |
The process of carburettion depends on |
| A. | speed of engine |
| B. | temperature of suction air |
| C. | volatility of fuel |
| D. | all of the above |
| Answer» D. all of the above | |
| 315. |
Volatile fuels with heating in intake manifolds will |
| A. | decrease volumetric efficiency |
| B. | decrease power output |
| C. | supply rich mixture |
| D. | both a and b |
| Answer» D. both a and b | |
| 316. |
Time available in seconds for process of carburettion at about 4000 rpm is about |
| A. | 0.0075 to 0.01 |
| B. | 0.01 to 0.02 |
| C. | 0.03 to 0.04 |
| D. | none of the above |
| Answer» A. 0.0075 to 0.01 | |
| 317. |
Increased temperature of inlet air, causes volumetric efficency of engine to |
| A. | increase |
| B. | decrease |
| C. | remains same |
| D. | same of the above |
| Answer» B. decrease | |
| 318. |
A carburettor is used in case of |
| A. | gas engines |
| B. | petrol engines |
| C. | diesel engines |
| D. | none of the above |
| Answer» B. petrol engines | |
| 319. |
The chemically correct mixture for petrol is approximately |
| A. | 1970-01-01 12:01:00 |
| B. | 1970-01-01 15:01:00 |
| C. | 1970-01-01 17:01:00 |
| D. | 1970-01-01 18:01:00 |
| Answer» B. 1970-01-01 15:01:00 | |
| 320. |
Mixture requirements at different load and speeds of petrol engine are |
| A. | starting and idling |
| B. | acceleration |
| C. | part load running |
| D. | all of the above |
| Answer» D. all of the above | |
| 321. |
Cruishing range as percentage of designed load refers to |
| A. | 0 to 20 |
| B. | 20 to 75 |
| C. | 80 to 100 |
| D. | none of the above |
| Answer» B. 20 to 75 | |
| 322. |
Idling of engine refers to |
| A. | no load |
| B. | 0-20% load |
| C. | 20-40 % load |
| D. | none of the above |
| Answer» A. no load | |
| 323. |
To develop maximum power, mixture supplied is |
| A. | rich |
| B. | chemically correct |
| C. | lean |
| D. | none of the above |
| Answer» A. rich | |
| 324. |
To have minimum specific fuek consumption ot to achieve maximum economy of fuel, mixture supplied is |
| A. | rich |
| B. | chemically correct |
| C. | lean |
| D. | none of the above |
| Answer» C. lean | |
| 325. |
Engine at the time of starting and idling needs mixture which is, |
| A. | rich |
| B. | chemically correct |
| C. | lean |
| D. | none of the above |
| Answer» A. rich | |
| 326. |
At low load running (zero to 20% load of rated power) engine requires mixture which is, |
| A. | rich |
| B. | chemically correct |
| C. | lean |
| D. | none of the above |
| Answer» A. rich | |
| 327. |
During sudden acceleration, engine requires |
| A. | rich mixture |
| B. | chemically correct mixture |
| C. | lean mixture |
| D. | may be lean or rich mixture |
| Answer» A. rich mixture | |
| 328. |
Mixture requirements by the engine part load running ( cruising range) is, |
| A. | rich |
| B. | chemically correct |
| C. | lean |
| D. | cant say |
| Answer» C. lean | |
| 329. |
A:F ratio needed during maximum power is |
| A. | 12 to 13.5:1 |
| B. | 1970-01-01 15:01:00 |
| C. | 16 to 17.5:1 |
| D. | 18 to 20:1 |
| Answer» A. 12 to 13.5:1 | |
| 330. |
A:F ratio needed for minimum specific fuel consumption of S.I. engine is, |
| A. | 12 to 14:1 |
| B. | 1970-01-01 15:01:00 |
| C. | 16.5 to 17.5:1 |
| D. | 18 to 20:1 |
| Answer» C. 16.5 to 17.5:1 | |
| 331. |
A:F ratio needed at the time of starting and idling is |
| A. | 11 to 12:1 |
| B. | 13 to 15:1 |
| C. | 16 to 18:1 |
| D. | 18 to 20:1 |
| Answer» A. 11 to 12:1 | |
| 332. |
A:F ratio required for low load running in the range of zero to 20% load is, |
| A. | 12 to 14:1 |
| B. | 15 to 17:1 |
| C. | 17 to 20:1 |
| D. | none of the above |
| Answer» A. 12 to 14:1 | |
| 333. |
A:F ratio used during part load running cruising range from |
| A. | 11 to 14:1 |
| B. | 1970-01-01 15:01:00 |
| C. | 16 to 17.5:1 |
| D. | 18 to 20:1 |
| Answer» C. 16 to 17.5:1 | |
| 334. |
A petrol engine is ____________ |
| A. | quality governed |
| B. | quantity governed |
| C. | both a and b |
| D. | none of the above |
| Answer» B. quantity governed | |
| 335. |
The tip of main nozzle with reference to petrol level in float chamber is |
| A. | at the same level |
| B. | at higher level |
| C. | at lower level |
| D. | none of the above |
| Answer» B. at higher level | |
| 336. |
During idling of engine of engine, it requires |
| A. | lean fuel-air mixture |
| B. | no fuel in air |
| C. | stoichiometric air-fuel ratio |
| D. | rich mixture |
| Answer» D. rich mixture | |
| 337. |
Which of the following is not the requirement of a good carburettor? |
| A. | prepare a:f ratio as required during starting, idling, no load running, cruising, maximum power |
| B. | prepare non-homogeneous (heterogeneous) mixture |
| C. | energy is supplied to change fuel from liquid to vapour form |
| D. | supply rich mixture during acceleration |
| Answer» B. prepare non-homogeneous (heterogeneous) mixture | |
| 338. |
Which is not the drawback of a simple carburettor, |
| A. | it provides required air-fuel ratio at all throttle position |
| B. | it provides increasing richness of a:f ratio as speed increases |
| C. | it provides very lean mixture at low speeds which is not adequate to ignite the mixture |
| D. | all of the above |
| Answer» A. it provides required air-fuel ratio at all throttle position | |
| 339. |
A choke in the carburettor is |
| A. | kept in closed closed position when cold starting the engine |
| B. | kept in open position when cold starting the engine |
| C. | not required since the carburettor can produce a:f ratio during cold starting |
| D. | none of the above |
| Answer» A. kept in closed closed position when cold starting the engine | |
| 340. |
During no load (idling) running of engine, the throttle valve is kept slmodt in closed position. A simple carburettor will provide |
| A. | rich mixture |
| B. | stoichiometric mixture |
| C. | extreamly lean mixture |
| D. | none of the above |
| Answer» C. extreamly lean mixture | |
| 341. |
The idle jet does not supply fuel during |
| A. | idling |
| B. | during part load running |
| C. | both a and b |
| D. | none of the above |
| Answer» B. during part load running | |
| 342. |
Which of the following is not the requirement of the carburetor |
| A. | prepare af ratio as required during starting, idling, maximum power and acceleration |
| B. | prepare non homogeneous mixture |
| C. | energy is supplied to change fuel from liquid to vapour form |
| D. | supply rich mixture during acceleration |
| Answer» B. prepare non homogeneous mixture | |
| 343. |
Which is not drawback of simple carburetor? |
| A. | it provides required air fuel ratio at all throttle position |
| B. | it supplies increasingly rich mixture as speed increases |
| C. | it provides very lean mixtures at low speeds |
| D. | none of the above |
| Answer» D. none of the above | |
| 344. |
A choke in the carburetor is |
| A. | kept in closed position when cold starting the engine |
| B. | kept in open position when cold starting the engine |
| C. | not required since carburetor can produce required af ratio during cold starting |
| D. | none of the above |
| Answer» A. kept in closed position when cold starting the engine | |
| 345. |
During no load running of the engine, the throttle valve is kept almost closed. A simple carburetor will provide |
| A. | rich mixture |
| B. | stoichiometric mixture |
| C. | extremely lean mixture |
| D. | none of the above |
| Answer» A. rich mixture | |
| 346. |
Compensating devices are provided in carburetor |
| A. | to vary quantity of mixture according to the load on the engine |
| B. | to supply af ratio always as needed by economy running |
| C. | to vary af ratio according to various operating conditions |
| D. | to supply rich mixtures during acceleration only |
| Answer» B. to supply af ratio always as needed by economy running | |
| 347. |
An emulsion tube or air bleed method is used in modern carburetor |
| A. | to maintain air fuel ratio at all speeds |
| B. | to increase af ratio with decrease in load |
| C. | to decrease af ratio with increase in speed |
| D. | none of the above |
| Answer» A. to maintain air fuel ratio at all speeds | |
| 348. |
A carburetor which is installed above intake manifold and flow ofmixture is assited by gravity is called |
| A. | up draught carburetor |
| B. | down draught carburetor |
| C. | side draught carburetor |
| D. | none of the above |
| Answer» B. down draught carburetor | |
| 349. |
Carburetor which uses horizontal draft tube is called |
| A. | up draught carburetor |
| B. | down draught carburetor |
| C. | side draught carburetor |
| D. | none of the above |
| Answer» C. side draught carburetor | |
| 350. |
Actual air fuel ratio supplied by carburetor at high altitudes compared to sea level |
| A. | lean |
| B. | rich |
| C. | same |
| D. | can\t say |
| Answer» B. rich | |
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