MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The fire tubes in a Scotch marine boiler are |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| Answer» B. vertical | |
| 2. |
Cut-off governing of steam engines is a method of controlling the engine output by varying |
| A. | volume of intake steam |
| B. | pressure of intake steam |
| C. | temperature of intake steam |
| D. | all of these |
| Answer» B. pressure of intake steam | |
| 3. |
The purpose of transmission in an automobile is |
| A. | to vary the speed of automobile |
| B. | to vary the torque at the wheels |
| C. | to vary the power of automobile |
| D. | none of these |
| Answer» C. to vary the power of automobile | |
| 4. |
The purpose of turning radius gauges is to measure the |
| A. | contact areas of the tyres |
| B. | free play of the steering wheel |
| C. | turning radius of the left and right wheels |
| D. | difference in the toe angles of the left and right wheels |
| Answer» D. difference in the toe angles of the left and right wheels | |
| 5. |
When the battery is half (50%) charged, the specific gravity of acid in a battery is usually |
| A. | 0.74 |
| B. | 1.00 |
| C. | 1.12 |
| D. | 1.19 |
| Answer» E. | |
| 6. |
The piston compression rings are made of |
| A. | cast iron |
| B. | steel |
| C. | aluminium |
| D. | bronze |
| Answer» B. steel | |
| 7. |
The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of |
| A. | section width to section height |
| B. | section height to section width |
| C. | wheel diameter to section height |
| D. | wheel diameter to section width |
| Answer» C. wheel diameter to section height | |
| 8. |
Two advantages of using helical gears rather than spur gears in a transmission system are |
| A. | strength and cost |
| B. | strength and less end thrust |
| C. | noise level and strength |
| D. | noise level and economy |
| Answer» D. noise level and economy | |
| 9. |
When the brake pedal free play is less than the specified value, then the |
| A. | brake drags |
| B. | brake fades |
| C. | vapour locking occurs in the brake lines |
| D. | antilock braking system malfunctions |
| Answer» B. brake fades | |
| 10. |
The braking control type traction control system (TCS) generally operates in the speed range of |
| A. | less than 20 kmph |
| B. | less than 40 kmph |
| C. | less than 60 kmph |
| D. | more than 60 kmph |
| Answer» C. less than 60 kmph | |
| 11. |
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on |
| A. | too lean mixture |
| B. | stoichiometric mixture |
| C. | most economical mixture |
| D. | too rich mixture |
| Answer» E. | |
| 12. |
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. | |
| 13. |
The two rows of cylinders in a 'V' type engine are generally arranged at |
| A. | 45 |
| B. | 60 |
| C. | 90 |
| D. | 130 |
| Answer» C. 90 | |
| 14. |
The temperature at which tyre inflation pressure should be checked is |
| A. | 20 C |
| B. | 25 C |
| C. | 35 C |
| D. | ambient temperature |
| Answer» E. | |
| 15. |
The calorific value of Diesel is about |
| A. | 36.5 MJ/kg |
| B. | 38.5 MJ/kg |
| C. | 42.5 MJ/kg |
| D. | 45.5 MJ/kg |
| Answer» D. 45.5 MJ/kg | |
| 16. |
Which part of the automobile tyre is subjected to greatest flexing action ? |
| A. | Bead |
| B. | Side wall |
| C. | Shoulder |
| D. | Tread |
| Answer» C. Shoulder | |
| 17. |
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 | |
| 18. |
The stroke of an engine is the |
| A. | volume of the cylinder |
| B. | length of the connecting rod |
| C. | internal diameter of the cylinder |
| D. | distance between T.D.C. and B.D.C. |
| Answer» E. | |
| 19. |
The rating of C.I. engine fuel (Diesel) is given by |
| A. | octane number |
| B. | performance number |
| C. | cetane number |
| D. | none of these |
| Answer» D. none of these | |
| 20. |
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 | |
| 21. |
The function of a second ring is that it is a |
| A. | back up compression ring which will work in place of the top ring when it is broken |
| B. | compression ring and aids the top ring in sealing and cooling |
| C. | back up oil control ring which will work in place of the bottom ring when it is broken |
| D. | cushion ring which prevents piston slap and knock |
| Answer» C. back up oil control ring which will work in place of the bottom ring when it is broken | |
| 22. |
The characteristic that is enhanced by the use of cylinder sleeves is |
| A. | cooling efficiency |
| B. | resistance to wear |
| C. | lubrication performance |
| D. | none of these |
| Answer» C. lubrication performance | |
| 23. |
The size of engine cylinder is referred in terms of its |
| A. | diameter and bore |
| B. | displacement and efficiency |
| C. | bore and stroke |
| D. | bore and length |
| Answer» D. bore and length | |
| 24. |
The purpose of a cylinder head gasket is to |
| A. | prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head |
| B. | prevent engine oil from going into combustion chamber |
| C. | removes impurities from cylinder head lubricating oil |
| D. | none of the above |
| Answer» B. prevent engine oil from going into combustion chamber | |
| 25. |
The number of exhaust manifolds in a V-6 engine are |
| A. | one |
| B. | two |
| C. | four |
| D. | eight |
| Answer» C. four | |
| 26. |
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 | |
| 27. |
The function of a first compression ring (top ring) is that it |
| A. | increases the combustion temperature |
| B. | creates swirl |
| C. | maintains a seal and prevents the fuel leakage |
| D. | maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber |
| Answer» E. | |
| 28. |
The octane rating of petrol commerically available is |
| A. | 85-95 |
| B. | 95-100 |
| C. | 100-110 |
| D. | 110-125 |
| Answer» B. 95-100 | |
| 29. |
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 | |
| 30. |
The function of a radiator fan in the cooling system is that |
| A. | it blows air through the radiator when necessary |
| B. | it is turned by wind force as the vehicle moves forward, and its rotation drives the water pump |
| C. | it cools the engine by blowing air onto the cylinder block |
| D. | it draws heat out of the engine compartment |
| Answer» B. it is turned by wind force as the vehicle moves forward, and its rotation drives the water pump | |
| 31. |
The main function of an exhaust muffler is the |
| A. | optimisation of exhaust efficiency |
| B. | reduction of exhaust noise |
| C. | reduction of nitrogen oxide in the exhaust gases |
| D. | reduction of the exhaust gas volume |
| Answer» C. reduction of nitrogen oxide in the exhaust gases | |
| 32. |
The purpose of a thermostat in an engine cooling system is to |
| A. | prevent the coolant from boiling |
| B. | allow the engine to warm up quickly |
| C. | indicate the coolant temperature |
| D. | pressurise the system to raise the boiling point |
| Answer» C. indicate the coolant temperature | |
| 33. |
The basic characteristics of a brake fluid is |
| A. | a high boiling point |
| B. | low viscosity |
| C. | compatibility with rubber and metal parts |
| D. | all of these |
| Answer» E. | |
| 34. |
The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is |
| A. | brake pedal - master cylinder - brake lines - vacuum servo mechanism - brake pads |
| B. | brake pedal - vacuum servo mechanism - master cylinder - brake lines - brake pads |
| C. | brake pedal - master cylinder - vacuum servo mechanism - brake lines - brake pads |
| D. | brake pedal - brake lines - vacuum servo mechanism - master cylinder - brake pads |
| Answer» C. brake pedal - master cylinder - vacuum servo mechanism - brake lines - brake pads | |
| 35. |
The composition of the electrolyte in a fully charged battery is that |
| A. | the electrolyte is pure distilled water |
| B. | the electrolyte is pure sulphuric acid |
| C. | the electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight |
| D. | the electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight |
| Answer» D. the electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight | |
| 36. |
The torque converter uses __________ to transfer torque. |
| A. | air |
| B. | automatic transmission fluid (ATF) |
| C. | gears |
| D. | steel belt |
| Answer» C. gears | |
| 37. |
The petrol engine works on |
| A. | Otto cycle |
| B. | Carnot cycle |
| C. | Diesel cycle |
| D. | Rankine cycle |
| Answer» B. Carnot cycle | |
| 38. |
In a Diesel engine, the function of a fuel injector is to |
| A. | mix the fuel and air |
| B. | ignite the air-fuel mixture |
| C. | provide flame front for ignition |
| D. | spray atomized fuel in the cylinder |
| Answer» E. | |
| 39. |
The firing order for an opposed four cylinder l.C. engine is |
| A. | 1-2-3-4 |
| B. | 1-3-4-2 |
| C. | 1-4-3-2 |
| D. | 1-3-24 |
| Answer» D. 1-3-24 | |
| 40. |
The function of positive crankcase ventilation (PCV) system is that it |
| A. | mixes fuel with air |
| B. | promotes combustion by creating a swirling movement in the air-fuel mixture |
| C. | returns blow-by gases from the crankcase to the intake system |
| D. | feeds blow-by gases to the exhaust manifold |
| Answer» D. feeds blow-by gases to the exhaust manifold | |
| 41. |
The effect of vapour locking on the brake performance is that the |
| A. | brakes function more effectively |
| B. | brakes fail completely |
| C. | brake operation is delayed after depression of the brake pedal |
| D. | vapour locking has no effect on brake performance |
| Answer» C. brake operation is delayed after depression of the brake pedal | |
| 42. |
The connecting rod is attached to the piston by the |
| A. | cap bolt |
| B. | piston pin |
| C. | cap roller bearing |
| D. | rod cap |
| Answer» C. cap roller bearing | |
| 43. |
The two kinds of piston rings are |
| A. | compression and oil-control rings |
| B. | compression and sliding seal rings |
| C. | oil scrapper and oil-control rings |
| D. | pressure and sealing rings |
| Answer» B. compression and sliding seal rings | |
| 44. |
The exhaust gas from petrol engine contains |
| A. | petrol vapours |
| B. | water vapours |
| C. | carbon monoxide |
| D. | all of these |
| Answer» E. | |
| 45. |
In case of a Diesel car, the pressure at the end of compression is of the order of |
| A. | 15 bar |
| B. | 25 bar |
| C. | 35 bar |
| D. | 45 bar |
| Answer» E. | |
| 46. |
Clutch facings are usually attached to the plate by |
| A. | steel rivets |
| B. | brass rivets |
| C. | aluminium screws |
| D. | steel screws |
| Answer» C. aluminium screws | |
| 47. |
Free pedal play in car clutches is about |
| A. | 15 mm |
| B. | 25 mm |
| C. | 40mm |
| D. | 60 mm |
| Answer» C. 40mm | |
| 48. |
The caster is called positive when the top of the king pin is inclined to the |
| A. | rear of the vehicle |
| B. | front of the vehicle |
| C. | left of the vehicle |
| D. | right of the vehicle |
| Answer» B. front of the vehicle | |
| 49. |
Instead of valves, the ports are used in case of |
| A. | four stroke I.C. engines |
| B. | two-stroke I.C. engines |
| C. | V-6 engines |
| D. | none of these |
| Answer» C. V-6 engines | |
| 50. |
The device for smoothening out the power impulses from the engine is called |
| A. | clutch |
| B. | differential |
| C. | flywheel |
| D. | torque converter |
| Answer» D. torque converter | |