MCQOPTIONS
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MCQOPTIONS
This section includes 538 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The air resistance to a car at 20 kmph is . The air resistance at 40 kmph will be |
| A. | 2 |
| B. | 4 |
| C. | 4 |
| Answer» D. | |
| 2. |
The main feature of MacPherson strut suspension is that |
| A. | the vertical size of the suspension can be made more compact |
| B. | non-vertical external forces are supported by the suspension arms |
| C. | the unsprung mass in lighter |
| D. | the assembly is slightly more complicated in design |
| Answer» C. the unsprung mass in lighter | |
| 3. |
When indicated power (..) and frictional power (..) are known, we can calculate |
| A. | brake power |
| B. | compression ratio |
| C. | specific air consumption |
| D. | mean effective pressure |
| Answer» B. compression ratio | |
| 4. |
An engine has a clearance volume of 100 cm and a swept volume of 800 cm. The compression ratio is |
| A. | 7:1 |
| B. | 8:1 |
| C. | 9:1 |
| D. | 10:1 |
| Answer» D. 10:1 | |
| 5. |
In a Diesel engine, the fuel is ignited by |
| A. | an electric spark |
| B. | the heat of compression |
| C. | the hot exhaust |
| D. | none of these |
| Answer» C. the hot exhaust | |
| 6. |
The information provided by the oxygen (O) sensor to the feedback control system is about the |
| A. | air-fuel ratio |
| B. | air temperature |
| C. | air flow speed |
| D. | exhaust gas volume |
| Answer» B. air temperature | |
| 7. |
The firing order in the case of a four-cylinder I.C. engine (inline) is given as |
| A. | 1-2-3-4 |
| B. | 1-4-3-2 |
| C. | 1-2-4-3 |
| D. | none of the above |
| E. | None of the above |
| Answer» D. none of the above | |
| 8. |
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. | |
| 9. |
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. | |
| 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 |
| Answer» B. False | |
| 11. |
The frequency of flashing of light per minute in a direction (side turn) indicator is about |
| A. | 9 |
| B. | 90 |
| C. | 900 |
| D. | 9000 |
| Answer» C. 900 | |
| 12. |
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 | |
| 13. |
The minimum parking brake force is generally __________ of gross vehicle mass (GVM). |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» E. | |
| 14. |
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. | |
| 15. |
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 |
| Answer» B. Incorrect | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
An over-inflated tyre will wear the tread most near the |
| A. | edges |
| B. | corners |
| C. | centre |
| D. | none of these |
| Answer» D. none of these | |
| 19. |
Which part of the automobile tyre is subjected to greatest flexing action ? |
| A. | Bead |
| B. | Side wall |
| C. | Shoulder |
| D. | Tread |
| Answer» C. Shoulder | |
| 20. |
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 | |
| 21. |
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 | |
| 22. |
Two speed reverse gear arrangement is generally provided in case of |
| A. | passenger cars |
| B. | metadors |
| C. | tractors |
| D. | trucks |
| Answer» D. trucks | |
| 23. |
Which of the following is not a part of the chassis ? |
| A. | Wheels |
| B. | Front axle |
| C. | Steering system |
| D. | Seats |
| Answer» E. | |
| 24. |
In a four wheel drive (4WD), the number of gear boxes are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 25. |
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. | |
| 26. |
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 |
| Answer» B. Disagree | |
| 27. |
When cornering, the differential generates a difference in the speed of the left and right wheels. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
The smooth shift mechanism of an automatic transmission reduces the degree of shock at shifting of gears. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 29. |
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. | |
| 30. |
The torque converter uses __________ to transfer torque. |
| A. | air |
| B. | automatic transmission fluid (ATF) |
| C. | gears |
| D. | steel belt |
| Answer» C. gears | |
| 31. |
The driveshafts are connected to the differential and wheel hubs through universal joints because the universal joints |
| A. | absorb the vibrations transferred from the surface of the road |
| B. | compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions. |
| C. | absorb any difference in speed between the left and right wheels when the vehicle is turning |
| D. | none of the above |
| Answer» C. absorb any difference in speed between the left and right wheels when the vehicle is turning | |
| 32. |
Which one of the following statements correctly describes the construction of a planetary gear type differential ? |
| A. | The six planetary pinions rotate in constant mesh with the internal gears. |
| B. | One drive shaft is splined to the central gear and the other to the planetary gear. |
| C. | Each planetary pinion gear meshes with both the central gear and the internal gear. |
| D. | The internal gear is fixed to the planetary gear. |
| Answer» C. Each planetary pinion gear meshes with both the central gear and the internal gear. | |
| 33. |
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. | |
| 34. |
When the vehicle is at rest, the clutch is in engaged position. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 35. |
The seat belt will move out smoothly when pulled out slowly, but it will lock when pulled quickly. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 36. |
A heat treated glass generally used in automobiles bursts into __________ upon cracking, |
| A. | sharp edged fragments |
| B. | small particles |
| Answer» C. | |
| 37. |
The main characteristics of a maintenance-free (MF) battery is that |
| A. | a maintenance-free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid |
| B. | a maintenance-free battery has a relatively short shelf life when compared with standard batteries |
| C. | since it is sealed, the water in a maintenance-free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water |
| D. | recharging of a maintenance-free battery is neither required nor possible |
| Answer» D. recharging of a maintenance-free battery is neither required nor possible | |
| 38. |
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) | |
| 39. |
How many cells are used in a 12 volt car battery ? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 40. |
The number of exhaust manifolds in a V-6 engine are |
| A. | one |
| B. | two |
| C. | four |
| D. | eight |
| Answer» C. four | |
| 41. |
Which of the following oil is more viscous ? |
| A. | SAE 30 |
| B. | SAE 40 |
| C. | SAE 70 |
| D. | SAE 80 |
| Answer» E. | |
| 42. |
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) | |
| 43. |
The engine oil is stored in __________ when the engine is not running. |
| A. | oil pan |
| B. | cylinder head |
| C. | oil pump |
| D. | separate oil tank |
| Answer» B. cylinder head | |
| 44. |
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 | |
| 45. |
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 | |
| 46. |
The function of a carburettor is to control the amount and ratio of air-fuel mixture. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 47. |
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 | |
| 48. |
When the engine speed increases, the ignition timing must be advanced. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 49. |
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 | |
| 50. |
The information provided by the oxygen (O2) sensor to the feedback control system is about the |
| A. | air-fuel ratio |
| B. | air temperature |
| C. | air flow speed |
| D. | exhaust gas volume |
| Answer» B. air temperature | |