McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 451. |
n-heptane has octane number equal to |
| A. | 0 |
| B. | 1 |
| C. | 100 |
| D. | 120 |
| Answer» A. 0 | |
| 452. |
Octane number 60 means, the fuel has antiknock proper equal to fuel from by |
| A. | 60% of n-octane 40% of petrol |
| B. | 60% of iso octane and 40% n-heptane |
| C. | 60% of iso octane and 40% of eptrol |
| D. | 60% of iso octane and 40% of tel |
| Answer» B. 60% of iso octane and 40% n-heptane | |
| 453. |
Dopes are___ |
| A. | chemical which will increase knocking tendency of fuel |
| B. | chemical which will decrease knocking tendency of fuel |
| C. | chemical which will decrese exhaust from engine |
| D. | chemical which will increse exhaust from engine |
| Answer» B. chemical which will decrease knocking tendency of fuel | |
| 454. |
RON means ____ |
| A. | radical oxygen number |
| B. | research oxygen number |
| C. | radical octane number |
| D. | research octane number |
| Answer» D. research octane number | |
| 455. |
MON means ___ |
| A. | metal oxygen number |
| B. | motor oxygen number |
| C. | metal octane number |
| D. | motor octane number |
| Answer» D. motor octane number | |
| 456. |
RON is calculated at___ |
| A. | low speed and low temperature |
| B. | high speed and low temperature |
| C. | low speed and high temperature |
| D. | high speed and high temperature |
| Answer» A. low speed and low temperature | |
| 457. |
Which is correct expression? |
| A. | ron=sensitivity-mon |
| B. | sensitivity=ron/mon |
| C. | sensitivity=ron-mon |
| D. | sensitivity=mon/ron |
| Answer» C. sensitivity=ron-mon | |
| 458. |
Sensitivity shows |
| A. | change in eprformance of fuel under test condition and practical condition |
| B. | change in octane number |
| C. | ratio of octane number of ideal fuel and actual fuel |
| D. | ratio of octane number of actual fuel to ideal fuel. |
| Answer» A. change in eprformance of fuel under test condition and practical condition | |
| 459. |
Higher sensitivity of fuel shows___ |
| A. | better performance under serve conditions. |
| B. | poor oerformance under serve conditions |
| C. | better emissions under serve conditions |
| D. | less emissions under serve conditions |
| Answer» B. poor oerformance under serve conditions | |
| 460. |
A 4-cylinder, 4-stroke petrol engine has,swept volume=0.001cubic meter and N=4200rpm. The power developed within the enigne cylinder is |
| A. | 35kw |
| B. | 140kw |
| C. | 2100kw |
| D. | nonenone of the above |
| Answer» B. 140kw | |
| 461. |
B.P of a four cylinde, four stroke engine is measured by brake dynamometer which develops a torque of 1000N-M at 4200rpm. The B.P is about |
| A. | 440kw |
| B. | 1760kw |
| C. | 4.4x105 kw |
| D. | none of the above |
| Answer» A. 440kw | |
| 462. |
In an eight cylinder engine the fuel suplied was 4000kg in 2 hours and the out put is 8000KW. Its bsfc is about |
| A. | 0.5kg/kwh |
| B. | 1kg/kwh |
| C. | 0.25kg/kwh |
| D. | 0.125kg/kwh |
| Answer» C. 0.25kg/kwh | |
| 463. |
brake thermal efficiency of ci engine is about |
| A. | 20-28% |
| B. | 30-40% |
| C. | 40-50% |
| D. | more then 50% |
| Answer» B. 30-40% | |
| 464. |
four cylinder engine , the indicated power is 100KW and brake power is 20KW/cylinder . Its mechanical efficiency is about |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.8 |
| D. | none of the above |
| Answer» C. 0.8 | |
| 465. |
brke mean effective pressure and indicated mean effective pressure of an ic engine are 8br and 10 bar resp. the mechanical efficiency of an engine when runnign at 4000 rpm is |
| A. | 0.8 |
| B. | 1.25 |
| C. | 80 |
| D. | none of the above |
| Answer» A. 0.8 | |
| 466. |
an engine develops 12KW and frictional power is 4KW . The mechanical efficiency is about |
| A. | 0.67 |
| B. | 0.33 |
| C. | 0.75 |
| D. | none of the above |
| Answer» C. 0.75 | |
| 467. |
an engine develops 100 Kw wihing the cylinder using fuel having calrofic value of 40000kj/kg with brake thermal efficiency 0.24 and mechanical efficiency 0.8. the fuel consumprion in kg/s…………….? |
| A. | 30 |
| B. | 1/120 |
| C. | 0.3 |
| D. | 37.5 |
| Answer» A. 30 | |
| 468. |
A four cylinde si engine develops 100 kw running at a constant speed . When eginition of each cylinder is cut-off successively at the same speed , the BP is 71, 70, 71, 72 KW. The FP of engine and mechanical efficiency are |
| A. | 116kw, 51.3% |
| B. | 16kw, 86.2% |
| C. | 29kw, 77.5% |
| D. | none of the above |
| Answer» B. 16kw, 86.2% | |
| 469. |
a vertical single cylinder four stroke diesel engine has a bore of 80mm and stroke of 100mm resp. it is water cooled and develops a torque of 305 N-m . What is the mean effective pressure …………? |
| A. | 2.285 bar |
| B. | 5.875 bar |
| C. | 6.325 bar |
| D. | 7.835 bar |
| Answer» B. 5.875 bar | |
| 470. |
a diesel engine consumes 5 grams fuel per second and develops a brake power 75KW. It has a mechanical efficiency of 85%. What would be the bsfc………? |
| A. | 0.055 g/kw s |
| B. | 0.033 g/kw s |
| C. | 0.066 g/kw s |
| D. | 0.088 g/kw s |
| Answer» C. 0.066 g/kw s | |
| 471. |
a diesel engine consumes 5 grams fuel per second and develops a brake power 75KW. It has a mechanical efficiency of 85%, bsfc is 0.066 g/KW s . What would be the isfc….? |
| A. | 0.683 kg/kwh |
| B. | 0.204 kg/kwh |
| C. | 0.106 kg/kwh |
| D. | 0.108 kg/kwh |
| Answer» B. 0.204 kg/kwh | |
| 472. |
a four stroke gas engine has a bor of 20cm and stroke of 35 cm . What would be the swept volume of the engine |
| A. | 6863.93 cc |
| B. | 5853.93 cc |
| C. | 5369.93 cc |
| D. | 7853.93 cc |
| Answer» D. 7853.93 cc | |
| 473. |
a diesel engine consumes at the rate of 5.5gm/ses and develops a power of 75KW . If the mechanical efficiency is 85% and calorific value is 44 MJ/kg. what would be the bsfc |
| A. | 0.074 g/kws |
| B. | 0.087 g/kws |
| C. | 0.587 g/kws |
| D. | 0.596 g/kws |
| Answer» A. 0.074 g/kws | |
| 474. |
a six cylinder gasoline engine operates on four stroke cycle. It runs at the speed of 4100rpm and develops a torque of 160N-m. what would be the brake power of the engine ……..? |
| A. | 58.53kw |
| B. | 68.66 kw |
| C. | 35.33kw |
| D. | all are the equal effective |
| Answer» B. 68.66 kw | |
| 475. |
a sic cylinder gasoline engine operates on a four stroke cycle. The bore of each cylinder is 80mm and the stroke is 100 mm. it runs at a speed of 4100 rpm and develops a brake power of 68.66Kw………what would be the brake mean effective pressure…………….? |
| A. | 5.23bar |
| B. | 2.37bar |
| C. | 6.66bar |
| D. | none of the above |
| Answer» C. 6.66bar | |
| 476. |
a six cylinder gasoline engine operates on the four stroke cycle . The bore of each cylinder is 80 mm and stroke is 100mm. What would be the compression ratio of the engine if clearnce volume per cylinder is 70cc |
| A. | 7.63 |
| B. | 8.18 |
| C. | 9.68 |
| D. | 5.28 |
| Answer» B. 8.18 | |
| 477. |
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» C. 0.428 | |
| 478. |
if the compression ration of otto cycle is 8.18 and brake thermal efficiency of actual cyle is 29.03%........what would be the relative efficienct |
| A. | 0.51109 |
| B. | 0.6103 |
| C. | 0.3105 |
| D. | 0.2908 |
| Answer» A. 0.51109 | |
| 479. |
a six cylinder four stroke petron engine having a bore of 90 mm and stroke of 100mm and runs at a speed of 2500 rpm. What would be the indicated power |
| A. | 53.239kw |
| B. | 18.368kw |
| C. | 67.593kw |
| D. | 55.235kw |
| Answer» C. 67.593kw | |
| 480. |
a six cylinder four stroke petrol engine develops a indicated power of 67.593 KW with indicated mean specific fuel consumption os 0.3kg/Kwh. What would be the mas flow rate of the fuel in kg/hr |
| A. | 25.369 |
| B. | 18.658 |
| C. | 20.278 |
| D. | 19.365 |
| Answer» C. 20.278 | |
| 481. |
the air standard efficiecny of engine is 0.42647 and corsponding relative efficiecny is 0.55. what would be the corsponding indicated thermal efficiency |
| A. | 0.2346 |
| B. | 0.4621 |
| C. | 0.3256 |
| D. | 0.3325 |
| Answer» A. 0.2346 | |
| 482. |
what would be the brake power of the engine, if the net brake load on the engine is 1470 N, effective brake corcumeference is of 4m and engine runs at the speed of 233.33rpm |
| A. | 22.583kw |
| B. | 24.689kw |
| C. | 26.589kw |
| D. | none of theabove |
| Answer» C. 26.589kw | |
| 483. |
if the brake power and indicated power of an engine are 22.286 KW and 56.589KW, what would be mecanicale efficiency of an engine ………..? |
| A. | 0.75 |
| B. | 0.78 |
| C. | 0.79 |
| D. | 0.86 |
| Answer» D. 0.86 | |
| 484. |
what would be the number of powe strokes per min ……..? If a six cylinder four stroke engine runs at 233.33 rpm and the number of missed powe stroke is 8.33 per min |
| A. | 105.33 |
| B. | 107.33 |
| C. | 108.66 |
| D. | none of the above |
| Answer» C. 108.66 | |
| 485. |
actual number of stroke per min will be equll to |
| A. | theroricl stroke per min + missed stroke per min |
| B. | theroricl stroke per min x missed stroke per min |
| C. | theroricl stroke per min - missed stroke per min |
| D. | none of the above |
| Answer» C. theroricl stroke per min - missed stroke per min | |
| 486. |
a four cylinder petrol engine with 70mm bore and 100 mm stroke length working on four stroke pricniple develops a torque 140 N-m at 4000 rpm……what would be the brake power of the engine ……? |
| A. | 58.65kw |
| B. | 63.25kw |
| C. | 48.35kw |
| D. | 33.32kw |
| Answer» A. 58.65kw | |
| 487. |
what would be the brake thermal efficiency of the engine, if the brake power of the engine is of 58.65KW, fuel consumption is 14kg/hr and the calrofic value of the fuel is 42500kj/kg |
| A. | 0.3548 |
| B. | 0.2578 |
| C. | 0.3898 |
| D. | 0.3696 |
| Answer» A. 0.3548 | |
| 488. |
what would be the compression ratio of the engine if the clearnce volume is 0.065lit and the engine bore is of 70mm and the stroke is of 100mm |
| A. | 5.632 |
| B. | 7 |
| C. | 6.923 |
| D. | 8 |
| Answer» C. 6.923 | |
| 489. |
what would be the mean effective pressure of the engine if the area of the indicator diagram is 13 cm2 , length of the indicator diagram is of 6cm and spring constant 2.9 bar/cm |
| A. | 6.5bar |
| B. | 5.8bar |
| C. | 3.5bar |
| D. | 7.8bar |
| Answer» B. 5.8bar | |
| 490. |
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» A. 0.00178 | |
| 491. |
what would be the mass flow rate of the gasoline in kg/s, the engine sonsumes 8lit/hr of gasoline, taking density of gasoline is 800 kg/cubic meter |
| A. | 0.00125 |
| B. | 0.00178 |
| C. | 0.2345 |
| D. | 0.0123 |
| Answer» B. 0.00178 | |
| 492. |
a single cylinder engine operating at 2000 rpm develops a torqu of 8 N-m and the indicated power of the engine is 2.0KW. What would be the frictional power |
| A. | 0.234 kw |
| B. | 0.1324kw |
| C. | 0.3253kw |
| D. | 0.0012kw |
| Answer» C. 0.3253kw | |
| 493. |
for four cylinder four stroke petrol engien the bore is 11cm and stroke is 13cm, running at speed of 2250 rpm. What is the swept volume of the engine |
| A. | 0.18 cubic meter per second |
| B. | 0.25 cubic meter per second |
| C. | 0.37 cubic meter per second |
| D. | none of the above |
| Answer» C. 0.37 cubic meter per second | |
| 494. |
a single cylinder four stroke engine having bore 18 cm and stroke 36cm, revolving at 285 rpm and having mean effective pressure 7.2 bar. The indicated power is |
| A. | 7.85kw |
| B. | 31.4kw |
| C. | 15.7kw |
| D. | none of the above |
| Answer» A. 7.85kw | |
| 495. |
what would be the mean effective pressure of the engine if the area of the positive loop of the indicator diagram is of 5.75 squr cm, area of negative loop of the indicator diagram 0.25 squre cm and the length of the indicator diagrma is of 5.5cm |
| A. | 4bar |
| B. | 3bar |
| C. | 7bar |
| D. | 2bar |
| Answer» A. 4bar | |
| 496. |
what would be the heat supplied to the engine in KJ/s, if the engine consumes 8 lit of gasoline per second. Take caloric value and specific gravity of fuel is 44000 kj/kg and 0.8 resp. |
| A. | 9.78 |
| B. | 8.48 |
| C. | 7.35 |
| D. | 4.35 |
| Answer» A. 9.78 | |
| 497. |
what would be the heat supplied to the engine in KJ/s, if the engine consumes 8 lit of gasoline per second. Take caloric value and density of fuel is 44000 kj/kg and 800 kg per cubic meter resp. |
| A. | 8.48 |
| B. | 9.78 |
| C. | 7.35 |
| D. | 4.35 |
| Answer» B. 9.78 | |
| 498. |
if the brake thermal efficiecny and indicated thermal efficiecny of the engine is 28% and 35%. What would be the mechanical efficiency of the engien |
| A. | 0.75 |
| B. | 0.8 |
| C. | 0.85 |
| D. | 0.78 |
| Answer» B. 0.8 | |
| 499. |
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» A. 800 kg/ cubic meter | |
| 500. |
what would be the air fuel ratio ot the engine if the air consumtion time for 0.1 cubic meter as 16.3 sec and whose density is 1.175kg per cubic meter and fuel consumtion time for 10 cc as 20.sec whos specific gravity is 0.7……. |
| A. | 17.6 |
| B. | 19.6 |
| C. | 18.6 |
| D. | 20.6 |
| Answer» D. 20.6 | |
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