McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 351. |
Which is not the advantage of gasoline injection as compared to carburetor |
| A. | exact af ratio at all loads |
| B. | same mixture strengths to all cylinders |
| C. | economy of fuel during idling and low load running |
| D. | low volumetric efficiency |
| Answer» D. low volumetric efficiency | |
| 352. |
Which is not a method of fuel injection in SI engine |
| A. | directly into the cylinder before the end of compression stroke |
| B. | in to the inlet manifold during suction stroke |
| C. | near inlet port during suction stroke |
| D. | directly into the cylinder in high pressure injection system |
| Answer» A. directly into the cylinder before the end of compression stroke | |
| 353. |
Continuous port fuel injection refers to injection of fuel |
| A. | near the inlet port |
| B. | near the inlet manifold |
| C. | directly into the cylinder |
| D. | none of the above |
| Answer» A. near the inlet port | |
| 354. |
In continuous inlet manifold injection system, the fuel is injected at a pressure of refers to injection of fuel |
| A. | 1.2 bar |
| B. | 1.5 bar |
| C. | 2 bar |
| D. | 3 bar |
| Answer» C. 2 bar | |
| 355. |
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» C. directly into the cylinder | |
| 356. |
Which of the following is not the advantage of GDI |
| A. | high volumetric efficiecy |
| B. | low emissions |
| C. | ease of cold starting |
| D. | high initial cost |
| Answer» D. high initial cost | |
| 357. |
In MPFI injection system |
| A. | each cyclider has separate fuel injector |
| B. | injectors are mounted on the inlet ports |
| C. | fuel from fuel tank is pumped under pressure |
| D. | all of the above |
| Answer» D. all of the above | |
| 358. |
Which is not an advantage of MPFI system? |
| A. | uniform air fuel ratio to each cylinder |
| B. | ease of cold starting |
| C. | low sfc |
| D. | elaborate arrangement of components |
| Answer» D. elaborate arrangement of components | |
| 359. |
If flame travel from point of ignition upto end of combustion chamber without change in speed, the combustion is called |
| A. | auto ignition |
| B. | normal |
| C. | abnormal |
| D. | none of the above |
| Answer» B. normal | |
| 360. |
The combustion of mixture without a flame front is called |
| A. | auto ignition |
| B. | normal |
| C. | abnormal |
| D. | none of the above |
| Answer» A. auto ignition | |
| 361. |
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» B. on engine side of the venturi | |
| 362. |
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» A. on atmospheric side of the venturi | |
| 363. |
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» C. minimum cross secional area | |
| 364. |
The main jet of the main metering system is situated |
| A. | above the level of the petrol in float chamber |
| B. | below the level of the petrol in float chamber |
| C. | at the same level |
| D. | any arrangement can be possible |
| Answer» A. above the level of the petrol in float chamber | |
| 365. |
The nozzle lip is the level difference between |
| A. | venturi and level of petrol in float chamber |
| B. | venturi and throttle valve |
| C. | throttle valve and choke valve |
| D. | none of the above |
| Answer» A. venturi and level of petrol in float chamber | |
| 366. |
The use of vent on a float chamber ensures |
| A. | filling of petrol if level of petrol goes down |
| B. | leak off connection for overflow case |
| C. | maintaining atmospheric pressure in float chamber |
| D. | none of the above |
| Answer» C. maintaining atmospheric pressure in float chamber | |
| 367. |
The carburetion does not perform this function |
| A. | atomization |
| B. | vaporization |
| C. | mixing air and fuel in right proportion |
| D. | increasing the temperature of the mixture near to its ignition point |
| Answer» D. increasing the temperature of the mixture near to its ignition point | |
| 368. |
The carburetor depression is |
| A. | the pressure drop because of whch air is sucked inside |
| B. | the pressure drop because of which fuel is sucked |
| C. | the pressure drop because of charge is taken inside the cylinder |
| D. | all of the above |
| Answer» B. the pressure drop because of which fuel is sucked | |
| 369. |
Operating the choke in cold starting means |
| A. | closing the choke valve |
| B. | opening the choke valve |
| C. | opening the throttle valve more |
| D. | closing the throttle valve |
| Answer» A. closing the choke valve | |
| 370. |
In idling system, the idling port opens in a draft tube of carburetor on |
| A. | venturi side of throttle valve |
| B. | on engine side of throttle valve |
| C. | exactly at the front of throttle valve |
| D. | none of the above |
| Answer» B. on engine side of throttle valve | |
| 371. |
Stoichiometric air fuel ratio of petrol is aproximately |
| A. | 1970-01-01 10:01:00 |
| B. | 1970-01-01 12:01:00 |
| C. | 1970-01-01 15:01:00 |
| D. | 1970-01-01 18:01:00 |
| Answer» C. 1970-01-01 15:01:00 | |
| 372. |
Equivalence ratio means |
| A. | actual fuel air ratio to stoichiometric fuel air ratio |
| B. | stoichiometric fuel air ratio to actual fuel air ratio |
| C. | mass of fuel to mass of air |
| D. | mass of air to mass of fuel |
| Answer» A. actual fuel air ratio to stoichiometric fuel air ratio | |
| 373. |
If air fuel ratio is greater than 16:1 then ixture is |
| A. | lean |
| B. | chemically correct |
| C. | rich |
| D. | perfect |
| Answer» A. lean | |
| 374. |
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» D. to increase air velocity | |
| 375. |
To get maximum power aim is |
| A. | to use all fuel in combustion chamber |
| B. | to utilize all oxygen in combustion chamber |
| C. | to get more economy |
| D. | to get less fuel consumption |
| Answer» B. to utilize all oxygen in combustion chamber | |
| 376. |
If the bonnet space is limited, the carburetor used is |
| A. | updraught |
| B. | downdraught |
| C. | horizontal draught |
| D. | slant draught |
| Answer» C. horizontal draught | |
| 377. |
In constant choke carburetor or open choke carburetor ___________ is kept constant. |
| A. | air flow area |
| B. | fuel flow area |
| C. | both air and fuel flow areas |
| D. | pressure drop |
| Answer» C. both air and fuel flow areas | |
| 378. |
A venturi of fixed dimension is used in |
| A. | constant choke carburetor |
| B. | constant vacuum carburetor |
| C. | multiple venturi carburetor |
| D. | multijet carburetor |
| Answer» A. constant choke carburetor | |
| 379. |
In ______________ carburetor, pressure drop is kept constant. |
| A. | constant choke carburetor |
| B. | constant vacuum carburetor |
| C. | multiple venturi carburetor |
| D. | multijet carburetor |
| Answer» B. constant vacuum carburetor | |
| 380. |
If the equivalence ratio is greater than one then, mixture is |
| A. | lean |
| B. | chemically correct |
| C. | rich |
| D. | perfect |
| Answer» C. rich | |
| 381. |
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» C. solex | |
| 382. |
Fuel flow area is varied in ____________ carburetor. |
| A. | solex |
| B. | zenith |
| C. | carter |
| D. | su |
| Answer» D. su | |
| 383. |
In this carburetor, air lifts fuel droplets against gravity. |
| A. | updraught |
| B. | downdraught |
| C. | side draught |
| D. | cross draught |
| Answer» A. updraught | |
| 384. |
If inlet temperature of air increases ___________ |
| A. | efficiency of ic engine increases but power output decreases |
| B. | efficiency of ic engine decreases but power output increases |
| C. | both efficiency and power output decrease |
| D. | both efficiency and power output increase |
| Answer» C. both efficiency and power output decrease | |
| 385. |
Chemixally correct air fue ratio of octane is |
| A. | 13.14:1 |
| B. | 15.14:1 |
| C. | 17.14:1 |
| D. | 1.17:14 |
| Answer» B. 15.14:1 | |
| 386. |
Which air fuel ratio gives maximum power for SI engine |
| A. | 1970-01-01 15:01:00 |
| B. | 1970-01-01 18:01:00 |
| C. | 1970-01-01 08:01:00 |
| D. | 1970-01-01 12:01:00 |
| Answer» D. 1970-01-01 12:01:00 | |
| 387. |
Which air fuel ratio gives minimum BSFC |
| A. | 1970-01-01 15:01:00 |
| B. | 1970-01-01 16:01:00 |
| C. | 1970-01-01 19:01:00 |
| D. | 1970-01-01 12:01:00 |
| Answer» B. 1970-01-01 16:01:00 | |
| 388. |
Rich mixture is required during |
| A. | idling and cruising |
| B. | cruising and acceleration |
| C. | idling and cruising and acceleration |
| D. | idling and acceleration |
| Answer» D. idling and acceleration | |
| 389. |
The choke is used when engine is |
| A. | cold |
| B. | hot |
| C. | accelerating |
| D. | idling |
| Answer» A. cold | |
| 390. |
SI engines use mixtures having AF ratio between |
| A. | 4:1 to 24:1 |
| B. | 3:1 to 17:1 |
| C. | 15:1 to 80:1 |
| D. | 1:1 to 5:1 |
| Answer» B. 3:1 to 17:1 | |
| 391. |
For SI engine for maximum power, relative fuel air ratio should be |
| A. | 0.6 |
| B. | 0.8 |
| C. | 1 |
| D. | 1.2 |
| Answer» D. 1.2 | |
| 392. |
Lean mixture is required during |
| A. | idling and cruising |
| B. | cruising and starting |
| C. | cruising only |
| D. | cruising, starting and idling |
| Answer» C. cruising only | |
| 393. |
For maximum thermal efficiency aim is to |
| A. | use all the oxygen present in combustion chamber |
| B. | use all the fuel present in combustion chamber |
| C. | to get maximum pressure in the cylinder |
| D. | to get maximum temperature in the cylinder |
| Answer» B. use all the fuel present in combustion chamber | |
| 394. |
The mixture requirements during staarting and idling are |
| A. | rich and rich |
| B. | rich and lean |
| C. | lean and lean |
| D. | lean and rich |
| Answer» A. rich and rich | |
| 395. |
For maximum economy mixture should be |
| A. | rich |
| B. | lean |
| C. | stoichiometric |
| D. | inert |
| Answer» B. lean | |
| 396. |
The pressure difference between float chamber and throat is |
| A. | nozzle lip |
| B. | nozzle dip |
| C. | carburetor depression |
| D. | potential difference |
| Answer» C. carburetor depression | |
| 397. |
When choke is closed, suction presssure is applied on |
| A. | air intake |
| B. | nozzle |
| C. | both air intake and nozzle |
| D. | every where |
| Answer» B. nozzle | |
| 398. |
Economiser system comes into action during |
| A. | cruising |
| B. | idling |
| C. | starting |
| D. | full throttle condition |
| Answer» D. full throttle condition | |
| 399. |
During cruising, mixture provided by simple carburetor is |
| A. | increasingly rich |
| B. | increasingly lean |
| C. | constant chemically correct |
| D. | sometimes rich, sometimes lean |
| Answer» A. increasingly rich | |
| 400. |
During acceleration, mixture provided by simple carburetor is |
| A. | increasingly rich |
| B. | increasingly lean |
| C. | lean |
| D. | chemically correct |
| Answer» C. lean | |
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