KSRCE/QM/7.2.1/AUEK.S.R. COLLEGE OF ENGINEERING (Autonomous), TIRUCHENGODE - 637215DEPARTMENT OF AUTOMOBILE ENGINEERINGB.E. DEGREE TERMINAL EXAMINATION I, January 201512AU3512 Comprehension

Semester / Year: VI / III Max. Marks: 50Date: 05.02.2015Time: 2 Hrs.Answer All Questions

1. The condition that causes vapor locking in a brake system isA. overheating of the fluid due to frequent brake applicationB. overcooling of the brakes during high speed drivingC. keeping the vehicle without use for an extended periodD. an excessively high engine speed on a downhill road2. The portion of a crankshaft which rests on cylinder block is called main journal.A. YesB. No3. A baffle plate is fitted inside the oil pan to prevent the oil from splashing when it is subjected to vibration and other movement during vehicle operation.A. TrueB. False4. The motion of the cam is transferred to the valves throughA. pistons B. Rocker arms C. camshaft pulley D. valve stems5. Which of the following symptom is caused as a result of brake disc run out ?A. Ineffectiveness of the brakes B. Judder during braking C. Localized wearing of the brake pads D. Rapid wearing of the brake pads6. If the engine coolant leaks into the engine oil, then engine oilA. appears milky B. becomes foamy C. turns black D.none of these7. The function of an alternator in an automobile is toA. supply electric power B. convert mechanical energy into electrical energyC. continually recharge the battery D. partly convert engine power into electric power8. A clutch is usually designed to transmit maximum torque which isA. equal to the maximum engine torque B.80 per cent of the maximum engine torqueC. 150 per cent of the maximum engine torque D. none of these9. What type of bearing is used for main bearings and connecting rod bearings ?A. Ball bearings B. Plain bearings C. Needle roller bearing D. Taper roller bearing10. It is necessary to maintain the valve clearances as theyA. reduce the resistance to sliding that occurs between the cam and the tappetB. allow for lengthening of the valves owing to the heat of combustionC. increase the speed at which the valves move up and downD. make the crankshaft turn smoothly11. Incorrect steering axis inclination (S.A.I.) causesA. tendency to assume toe-out orientation B. generation of a braking effect at tight cornersC. poor recovery of the steering wheel after making a turnD. the vehicle to pull to the side of lesser inclination12. In a unit type body (frameless body) design, the sheet metal parts are welded together, forming a frame work to which outer skin is attached.A. TrueB. False 13. The torque available at the contact between driving wheels and road is known asA. brake effort B. Tractive effort C. clutch effort D. none of these14. A traction control system (TCS) in automobiles controls theA. vibrations on the steering wheel B. engine power during accelerationC. torque that is transmitted by the tyres to the road surface D. stopping distance in case of emergency15. In radial tyresA. one ply layer runs diagonally one way and another layer runs diagonally the other wayB. all plies run parallel to one another and vertical to tyre beadC. inner tubes are always used D.none of these16. The oil pump is driven by theA. camshaft B. alternator shaft C. crankshaft via drive belt D. crankshaft directly17. In a spark plug, when the temperature of the central electrode exceeds a certain temperature, any carbon that has adhered will be burnt off, and the temperature at which this burning off carbon starts is referred to as the self cleaning temperature.A. CorrectB. Incorrect18. The flywheel and the pressure plate bind the clutch disc between them so that the engine and the transmission can be engaged.A. YesB. No19. The vehicle ride will be comfortable ifA. unsprung mass is kept minimum B. sprang mass is kept minimumC. vehicle mass is kept minimumD. all of these20. The main function of intake manifold is that itA. promotes the mixture of air and fuelB. reduces intake noiseC. cools the intake air to a suitable temperatureD. distributes intake air equally to the cylinders21. Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle.A. YesB. No22. In automobiles G.V.W. refers toA. gross vehicle widthB. gross vehicle weightC. gross vehicle wheel baseD. gross vehicle wheel track23. The firing order for an in-line four cylinder I.C. engine isA. 1-2-3-4B. 1-3-4-2 C. 1-2-4-3D. 1-3-2-424. In a ventilated disc brake,A. a duct directs air towards the caliper for cooling while the vehicle is movingB. caliper is covered with cooling finsC. disc contains many small holes for optimum cooling performanceD. disc contains radial vanes between its rubbing surfaces for optimum cooling performance25. The effect of having excess camber isA. excessive steering alignment torqueB. hard steeringC. too much tractionD. uneven tyre wear26. If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is aboutA. 17:1B. 15:1C. 13:1D. 10:127. The advantage of double-wishbone suspension design is that a large amount of freedom is available for setting geometry and precise settings can be made for driving comfort and steerability,A. CorrectB. Incorrect28. The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck isA. 1.143 NB. 11.43 NC. 114.3 ND. 1143 N29. If the level of tension in the belt is too high, it can result in a loss of power or in bending of the rotating shaft or crankshaft.A. CorrectB. Incorrect30. If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is calledA. detonationB. ignitionC. pre-ignitionD. rumble31. The information provided by the oxygen (O2) sensor to the feedback control system is about theA. air-fuel ratioB. air temperatureC. air flow speedD. exhaust gas volume32. The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known asA. indicator diagramB. axial force diagram C. valve timing diagram D. none of these33. The difference between DOT 3 and DOT 4 brake fluids isA. DOT 4 fluid has a higher boiling point than DOT 3 fluidB. DOT 4 fluid has a lower boiling point than DOT 3 fluidC. DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service lifeD. DOT 4 fluid is more resistant to freezing than DOT 3 fluid34. The battery is an electrochemical device, which means batteryA. makes chemicals by mechanical means B. uses chemical action to provide electricityC. has curved plates instead of flat platesD. does not use an electrolyte35. The operation of removing trapped air from the hydraulic braking system is known asA. trappingB. tappingC. bleedingD. cleaning36. The aluminium alloy is used in cylinder blocks becauseA. it is lighter and have good heat dissipation characteristics B. material cost is lowC. it does not require any cylinder linersD. the piston is also made of aluminium alloy37. In a fuel injection system, the electronic control module (ECM) calculates the optimum fuel-injection volume for the engine condition based on the data received from the sensors, and injects this volume of fuel into the intake manifold at the optimum timing.A. CorrectB. Incorrect38. The tilting of the front wheels away from the vertical, when viewed from the front of the car, is calledA. camberB. casterC. toe-inD. toe-out39. The main function of the tread pattern on tyre is thatA. the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheatingB. the crests between the tread grooves absorb road noiseC. in wet conditions, the tread grooves expel water that is drawn between the tyre and road surfaceD. the tread pattern protects the tyre's inner carcass from small stones and pieces of glass40. The compression ratio in petrol engine is kept less than in Diesel engine becauseA. it makes petrol engines lighterB. higher or equivalent compression ratio in petrol engines is not possible due to pre-ignitionC. less compression ratio gives better performanceD. it is just customary to have less compression ratio in petrol engines41. The most commonly used supplementary restraint system (SRS) component isA. seat beltB. brakeC. airbag D. steering42. The natural gas is compressed in a CNG cylinder at a pressure ofA. 200 barB. 220 barC. 250 barD. 300 bar43. The cetane rating of Diesel fuel is in the order ofA. 25B. 45C. 70D. 9044. The air gap between the central electrode and ground (or side) electrode of a spark plug is aroundA. 0.2 mmB. 0.5 mmC. 1 mmD. 1.5 mm45. The cetane number of a Diesel fuel is a measure ofA. volatilityB. viscosityC. ignition qualityD. delay peirod46. The valve overlap in four stroke petrol engines is approximatelyA. 30B. 60C. 90D. 12047. The petrol engines are also known asA. spark ignition (S.I.) enginesB. compression ignition (C.I.) enginesC. steam enginesD. none of these48. Which of the following indicates a multigrade oil ?A. SAE 30B. API SFC. SAE 20 W-50D. API 5049. The coefficient of friction for the clutch facing is approximatelyA. 0.1B. 0.4C. 0.8D. 1.250. The component that connects the steering rack to the knuckles isA. tie-rodB. sector gearC. pivotD. spline