MCQOPTIONS
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MCQOPTIONS
This section includes 471 Mcqs, each offering curated multiple-choice questions to sharpen your Uncategorized topics knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
In this carburetor, air lifts fuel droplets against gravity. |
| A. | updraught |
| B. | downdraught |
| C. | side draught |
| D. | cross draught |
| Answer» B. downdraught | |
| 352. |
The tip of the nozzle is kept |
| A. | at the same level as that of fuel in float chamber |
| B. | at level above the fuel level in float chamber |
| C. | at level below the fuel level in float chamber |
| D. | sometimes above, sometime below the fuel level in float chamber |
| Answer» C. at level below the fuel level in float chamber | |
| 353. |
GDI refers to injection of fuel |
| A. | near the inlet port |
| B. | into the intake manifold |
| C. | directly into the cylinder |
| D. | none of the above |
| Answer» D. none of the above | |
| 354. |
To reduce detonation, the spark plugh should be located |
| A. | near to intake valve |
| B. | at the corner |
| C. | centrally |
| D. | neat piston |
| Answer» D. neat piston | |
| 355. |
Which is not a probable location of preignition? |
| A. | spark plugh tip |
| B. | exhaust valve |
| C. | remote corner of chamber |
| D. | intake valve |
| Answer» E. | |
| 356. |
When SI engine is Idling |
| A. | leaner mixture is required |
| B. | mixture close to stoichiometric condition is needed |
| C. | richer mixture is required |
| D. | it may vary with atmospheric condition |
| Answer» D. it may vary with atmospheric condition | |
| 357. |
what would be the mass flow rate of gasoline in kg/s, if the engine consumes 8lit/hr, taking the specific gravity of the gasoline is 0.8 |
| A. | 0.00178 |
| B. | 0.00168 |
| C. | 0.1234 |
| D. | 0.4321 |
| Answer» B. 0.00168 | |
| 358. |
Stoichiometric air-fuel ratio of petrol engine is roughly |
| A. | 18/1 |
| B. | 25/1 |
| C. | 15/1 |
| D. | 10/1 |
| Answer» D. 10/1 | |
| 359. |
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» D. none of the above | |
| 360. |
Stoichiometric condition in S I Engine is such that |
| A. | it creates some pollutants with combustion of fuel and air mixture |
| B. | it gives complete combustion of the air fuel mixture |
| C. | exact quantity of the air is mixed with fuel to burn mixture effectively |
| D. | both b and c |
| Answer» E. | |
| 361. |
what is the density of the fuel whose specific gravity is 0.8 |
| A. | 800 kg/ cubic meter |
| B. | 780 cubic meter |
| C. | 850 cubic meter |
| D. | 810 cubic meter |
| Answer» B. 780 cubic meter | |
| 362. |
Now a days a unleaded petrol is in the market because |
| A. | it has better anti knock property |
| B. | it is cheaper as compared to leaded petrol |
| C. | lead deposits are poisonous |
| D. | it is highly refined petrol |
| Answer» D. it is highly refined petrol | |
| 363. |
Fuel flow rate as per demand is varied by varying pressure difference in _____ carburetor. |
| A. | su |
| B. | apha |
| C. | solex |
| D. | none of the above |
| Answer» D. none of the above | |
| 364. |
non dispersive infrared analyzer is widely accepted instrument for measuring |
| A. | unburned hydrocarbons |
| B. | carbone monoxide |
| C. | carbone dioxide |
| D. | nox |
| Answer» C. carbone dioxide | |
| 365. |
chemilumme scence analyzer is used for measuring |
| A. | hc |
| B. | co |
| C. | nox |
| D. | co2 |
| Answer» D. co2 | |
| 366. |
The correct expression for nozzle lip is |
| A. | tip height fuel surface height |
| B. | tip height throat height |
| C. | throat height float chamber height |
| D. | fuel surface height |
| Answer» B. tip height throat height | |
| 367. |
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» C. 1970-01-01 17:01:00 | |
| 368. |
A carburettor is used in case of |
| A. | gas engines |
| B. | petrol engines |
| C. | diesel engines |
| D. | none of the above |
| Answer» C. diesel engines | |
| 369. |
Idling condition of the SI engine is |
| A. | when engine is running but no power out put from crank shaft |
| B. | when engine is running but power is produced from crankshaft |
| C. | when engine is not running but power out put from crank shaft |
| D. | only crankshaft is rotating |
| Answer» B. when engine is running but power is produced from crankshaft | |
| 370. |
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» E. | |
| 371. |
Transient condition of SI engine is |
| A. | idling |
| B. | cruising |
| C. | starting |
| D. | maximum power range |
| Answer» D. maximum power range | |
| 372. |
Idling of engine refers to |
| A. | no load |
| B. | 0-20% load |
| C. | 20-40 % load |
| D. | none of the above |
| Answer» B. 0-20% load | |
| 373. |
the spark timing and combustion rate should be should be such that |
| A. | one half of the total pressure occurs at tdc |
| B. | ignition delay is reduced |
| C. | peak pressure occurs at tdc |
| D. | none of the above |
| Answer» B. ignition delay is reduced | |
| 374. |
In port injection system, location of injector is |
| A. | inside cylinder near intake port |
| B. | near carburetor |
| C. | inside intake manifold near intake port |
| D. | inside cylinder near exhaust port |
| Answer» D. inside cylinder near exhaust port | |
| 375. |
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» C. venturi | |
| 376. |
Petrol engines are |
| A. | quality governed |
| B. | mechanically governed |
| C. | quantity governed |
| D. | all of the above |
| Answer» D. all of the above | |
| 377. |
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» C. engine running at varying speed without load varying on engine | |
| 378. |
In complete caruretor, idling passage opens in a draft tube at which position? |
| A. | engine side of throttle valve |
| B. | venturi side of throttle valve |
| C. | at the venturi |
| D. | none of the above |
| Answer» B. venturi side of throttle valve | |
| 379. |
Jet tube in simple carburetor is also called as |
| A. | choke tube |
| B. | venturi tube |
| C. | both a and b |
| D. | only a |
| Answer» D. only a | |
| 380. |
Which of the following is not necessary condition for starting of combustion process in SI engines? |
| A. | compression of charge |
| B. | presence of fuel |
| C. | presence of oxygen |
| D. | formation of spark |
| Answer» B. presence of fuel | |
| 381. |
in the air base method of measuring air flow, the air base is provided to |
| A. | damp out the pulsations |
| B. | have constant temprature |
| C. | have constant flow |
| D. | provide constant velocity of flow |
| Answer» D. provide constant velocity of flow | |
| 382. |
what would be the mass flow rate of the air, if the air consumption time for 0.1 cubic meter as 16.3 sec whose density is 1.175 kg per cubic meter |
| A. | 0.00821 kg/sec |
| B. | 0.00531 kg/sec |
| C. | 0.00231 kg/se |
| D. | 0.00721 kg/se |
| Answer» E. | |
| 383. |
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» B. to get proper working of simple carburetor | |
| 384. |
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» D. none of the above | |
| 385. |
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» E. | |
| 386. |
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» E. | |
| 387. |
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» C. after throat section because of suction created at that point | |
| 388. |
The function of the venturi in the carburetor is |
| A. | to decrease fuel flow |
| B. | to increase fuel flow |
| C. | to decrease air velocity |
| D. | to increase air velocity |
| Answer» E. | |
| 389. |
which of the following factor will not assist in improving thermal efficiency of a compression ignition engine |
| A. | fine atomisation and even distribution of fuel |
| B. | miniumum heat loss during combustion |
| C. | clear exhaust |
| D. | high surgace to volume ratio |
| Answer» E. | |
| 390. |
A venturi of fixed dimension is used in |
| A. | constant choke carburetor |
| B. | constant vacuum carburetor |
| C. | multiple venturi carburetor |
| D. | multijet carburetor |
| Answer» B. constant vacuum carburetor | |
| 391. |
The venturi is the portion in a draft tube |
| A. | converging section |
| B. | diverging section |
| C. | minimum cross secional area |
| D. | all of the above |
| Answer» D. all of the above | |
| 392. |
The combustion will not start immediately after spark because of |
| A. | flame propogation |
| B. | after burning |
| C. | ignition lag |
| D. | motoring |
| Answer» D. motoring | |
| 393. |
During idling, mixture provided by simple carburetor is |
| A. | increasingly rich |
| B. | increasingly lean |
| C. | lean |
| D. | chemically correct |
| Answer» D. chemically correct | |
| 394. |
During acceleration, mixture provided by simple carburetor is |
| A. | increasingly rich |
| B. | increasingly lean |
| C. | lean |
| D. | chemically correct |
| Answer» D. chemically correct | |
| 395. |
Simple carburetor provides correct quality of mixture |
| A. | at all operating conditions |
| B. | during acceleration only |
| C. | during cruising only |
| D. | only at one throttle position |
| Answer» E. | |
| 396. |
The choke valve is placed in a draft tube |
| A. | on atmospheric side of the venturi |
| B. | on engine side of the venturi |
| C. | at the venturi |
| D. | none of the above |
| Answer» B. on engine side of the venturi | |
| 397. |
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» D. throttle valve section | |
| 398. |
The cold start injector provides |
| A. | stoichiometric mixture |
| B. | rich mixture |
| C. | lean mixture |
| D. | heating of fuel |
| Answer» C. lean mixture | |
| 399. |
The throttle valve is placed in a draft tube |
| A. | on atmospheric side of the venturi |
| B. | on engine side of the venturi |
| C. | at the venturi |
| D. | none of the above |
| Answer» C. at the venturi | |
| 400. |
if the compression ratio of otto cycle is 8.18, what would be the air standard efficiency |
| A. | 0.325 |
| B. | 0.658 |
| C. | 0.428 |
| D. | 0.568 |
| Answer» D. 0.568 | |