MCQOPTIONS
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MCQOPTIONS
This section includes 365 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The main merit of a multi-cylinder type cylinder sleeve is |
| A. | smaller engine dimensions |
| B. | better cooling efficiency |
| C. | high rigidity |
| D. | none of these |
| Answer» B. better cooling efficiency | |
| 2. |
The anti-knock property of compression ignition engine fuel can be improved by adding |
| A. | tetraethyl lead |
| B. | trimethyl pentane |
| C. | amyl nitrate |
| D. | hexadecane |
| Answer» D. hexadecane | |
| 3. |
When the engine speed increases, the ignition timing must be advanced. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 4. |
When the piston is at T.D.C, the volume above the piston in the combustion chamber is the |
| A. | clearance volume |
| B. | cylinder volume |
| C. | exhaust volume |
| D. | none of these |
| Answer» B. cylinder volume | |
| 5. |
The reconditioning process used to give cylinder bore surfaces a cross-hatch pattern, is known as |
| A. | honing |
| B. | porous plating |
| C. | boring |
| D. | shot peening |
| Answer» B. porous plating | |
| 6. |
The function of a carburettor is to control the amount and ratio of air-fuel mixture. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 7. |
When turning a corner, |
| A. | the front wheels are toeing out |
| B. | the front wheels are turning on different angles |
| C. | the inside front wheels has a greater angle than the outside wheel |
| D. | all of the above |
| Answer» E. | |
| 8. |
The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crank-case, is known as |
| A. | cleaning |
| B. | priming |
| C. | scavenging |
| D. | detonation |
| Answer» D. detonation | |
| 9. |
The camshaft is driven by the crankshaft via the timing belt. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 10. |
The engine's idling speed will increase by a slight degree immediately after a cold engine has been started. It will drop as the engine warms up. and it will eventually reach the standard level. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 11. |
Which of the following parameter can be adjusted by modifying the tie-rod attachment length ? |
| A. | Camber |
| B. | Caster |
| C. | Toe |
| D. | Steering gear ratio |
| Answer» D. Steering gear ratio | |
| 12. |
When cornering, the differential generates a difference in the speed of the left and right wheels. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 13. |
The major purpose of an electronically-controlled automatic transmission is that this type of transmission |
| A. | eliminates gear clutches |
| B. | eliminates the gear shift lever |
| C. | reduces the number of automatic-transmission components |
| D. | reduces shift shock and achieves more efficient transmission of engine torque |
| Answer» E. | |
| 14. |
The function of oil-control rings is that it |
| A. | lubricates the cylinder wall by releasing oil from its hole |
| B. | keeps the cylinder wall lubricated by holding oil in its channel |
| C. | prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan |
| D. | maintains a seal and prevents escape of burned gases and oil leakage |
| Answer» D. maintains a seal and prevents escape of burned gases and oil leakage | |
| 15. |
Which part of the automobile tyre is subjected to greatest flexing action ? |
| A. | Bead |
| B. | Side wall |
| C. | Shoulder |
| D. | Tread |
| Answer» C. Shoulder | |
| 16. |
The function of antilock brake system (ABS) is that is |
| A. | reduces the stopping distance |
| B. | minimises the brake fade |
| C. | maintains directional control during braking by preventing the wheels from locking |
| D. | prevents nose dives during braking and thereby postpones locking of the wheels |
| Answer» D. prevents nose dives during braking and thereby postpones locking of the wheels | |
| 17. |
A heat treated glass generally used in automobiles bursts into __________ upon cracking, |
| A. | sharp edged fragments |
| B. | small particles |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 18. |
In comparison to frame type construction, the frameless structure construction of automobiles is economical when produced in __________ numbers. |
| A. | small |
| B. | large |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 19. |
The discharged lead-acid battery has on its plates |
| A. | lead peroxide (PbO2) |
| B. | spongy lead (Pb) |
| C. | lead sulphate (PbSO₄) |
| D. | sulphuric acid (H2SO4) |
| Answer» D. sulphuric acid (H2SO4) | |
| 20. |
In a four cylinder in-line engine, the number of firing strokes in one revolution of the crank is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 21. |
In Diesel engines, during suction stroke, __________ is drawn in the cylinder. |
| A. | air and fuel |
| B. | only fuel |
| C. | only air |
| D. | none of these |
| Answer» D. none of these | |
| 22. |
The PCV valve incorporates a spring loaded plunger and opens in proportion to the level of vacuum pressure in the intake manifold. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 23. |
Which one of the following statement correctly describe the construction of a bevel-gear type differential? |
| A. | The drive shafts are splined to the differential carrier. |
| B. | The left side gear and the differential carrier rotate in constant unison. |
| C. | The differential carrier houses differential pinion gears and side gears, each pinion gear meshes with a different side gear. |
| D. | The differential carrier houses differential pinion gears and side gears |
| Answer» E. | |
| 24. |
The motion of the cam is transferred to the rocker arm, moving it upwards and downwards. This rocker-arm motion then forces the valve downwards against the force in the valve spring so that the valve can open. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 25. |
The ease with which petrol vapourizes is called its |
| A. | oxidation |
| B. | octane number |
| C. | volatility |
| D. | cetane number |
| Answer» D. cetane number | |
| 26. |
In which of the following conditions, the idle CO percentage should be measured with the vehicle ? |
| A. | Headlights and other electrical devices are switched off. |
| B. | Headlights and other electrical devices are switched on. |
| C. | Headlights and other lights are switched off. |
| D. | Headlights are switched on. |
| Answer» B. Headlights and other electrical devices are switched on. | |
| 27. |
The number of exhaust manifolds in a V-6 engine are |
| A. | one |
| B. | two |
| C. | four |
| D. | eight |
| Answer» C. four | |
| 28. |
The forced-fed lubrication system means that the oil is delivered to the engine by |
| A. | gravity |
| B. | the pressure created by the oil pump |
| C. | splashing action of the crankshaft |
| D. | none of these |
| Answer» C. splashing action of the crankshaft | |
| 29. |
The engine oil viscosity is defined by __________ ratings. |
| A. | automatic transmission fluid (ATF) |
| B. | society of automotive engineers (SAE) |
| C. | gross vehicle weight (GVW) |
| D. | American petroleum institute (API) |
| Answer» C. gross vehicle weight (GVW) | |
| 30. |
If a tyre is designated as 175/65 R14 82 S, then the aspect ratio for the tyre is |
| A. | 175 |
| B. | 65 |
| C. | 14 |
| D. | 82 |
| Answer» C. 14 | |
| 31. |
Toe-in ensures parallel rolling of the wheel thus stabilizing steering in addition to preventing both sides slipping and excessive tyre wear. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 32. |
The smooth shift mechanism of an automatic transmission reduces the degree of shock at shifting of gears. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 33. |
The minimum parking brake force is generally __________ of gross vehicle mass (GVM). |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» E. | |
| 34. |
The differential ensures that each wheel is driven at a speed which corresponds to the distance it must travel around a corner, and it consequently prevents against excessive tyre wear. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 35. |
The compression ratio in Diesel engines is less than the petrol engine. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 36. |
In a four speed four-stroke Diesel engine, the intake valve |
| A. | opens at T.D.C. and closes at B.D.C. |
| B. | opens at 20° before T.D.C. and closes at 35° after B.D.C. |
| C. | opens at 10° after T.D.C. and closes at 20° before B.D.C. |
| D. | none of the above |
| Answer» C. opens at 10° after T.D.C. and closes at 20° before B.D.C. | |
| 37. |
The crescent-shaped cavity on the piston head top surface is called as |
| A. | piston oil hole |
| B. | snap ring |
| C. | valve recess |
| D. | valve clearance |
| Answer» D. valve clearance | |
| 38. |
The torque converter uses __________ to transfer torque. |
| A. | air |
| B. | automatic transmission fluid (ATF) |
| C. | gears |
| D. | steel belt |
| Answer» C. gears | |
| 39. |
In comparison with a radial tyre, one advantage of a bias-ply tyre is |
| A. | longer life |
| B. | lower rolling resistance |
| C. | smoother ride at low speeds |
| D. | none of these |
| Answer» D. none of these | |
| 40. |
When the vehicle is at rest, the clutch is in engaged position. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 41. |
The ball joints are used on the tie-rod ends, because they |
| A. | reduce the amount of noise generated |
| B. | reduce the amount of sliding resistance |
| C. | can deal with movement of the suspension both vertically and in other directions |
| D. | improve the force transmission speed |
| Answer» D. improve the force transmission speed | |
| 42. |
Which of the following bulb in a car will have the least wattage ? |
| A. | Head light bulb |
| B. | Stop light bulb |
| C. | Parking light bulb |
| D. | Ignition warning bulb |
| Answer» E. | |
| 43. |
In order to implement gear changes in the gear unit of an automatic transmission, a __________ is used. |
| A. | synchronizer |
| B. | planetary gear |
| C. | magnetic clutch |
| D. | hydraulic multi plate clutch |
| Answer» E. | |
| 44. |
The indicated power of a four-stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)) |
| A. | P.L.A.N/2 |
| B. | P.L.A.N |
| C. | 2 x P.L.A.N |
| D. | P.L.A.N/4 |
| Answer» B. P.L.A.N | |
| 45. |
In petrol engines, during suction stroke, __________ is drawn in the cylinder |
| A. | air and fuel |
| B. | only fuel |
| C. | only air |
| D. | none of these |
| Answer» B. only fuel | |
| 46. |
The sequence order of events in a four-stroke engine is |
| A. | suction - exhaust - power - compression |
| B. | suction - power - compression - exhaust |
| C. | suction - compression - power - exhaust |
| D. | exhaust - compression - power - suction |
| Answer» D. exhaust - compression - power - suction | |
| 47. |
The seat belt will move out smoothly when pulled out slowly, but it will lock when pulled quickly. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 48. |
A petrol engine of a car develops 125 N-m torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is |
| A. | 8.091 N-m |
| B. | 80.91 N-m |
| C. | 809.1 N-m |
| D. | 8091 N-m |
| Answer» D. 8091 N-m | |
| 49. |
The advantage of the fuel injection system over the carburetor system is |
| A. | improved fuel efficiency |
| B. | improved emission |
| C. | improved power output |
| D. | all of these |
| Answer» E. | |
| 50. |
The engine torque increases with the increase in engine speed up to a certain point after which it starts to fall down. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |