Automobile Engineering Questions

• Idle speed behavior after cold start — statement validation An engine’s idle speed rises slightly just after a cold start, then drops as the engine warms up and stabilises at the normal specification. Is this statement correct?
• Cylinder blocks with multi-cylinder sleeves — principal merit Considering engine design trade-offs, what is the main merit of using a multi-cylinder type cylinder sleeve arrangement?
• Engine mechanism fundamentals To which specific part of the crankshaft is the lower end of the connecting rod attached in an internal combustion engine?
• Automotive lighting — power ratings Which bulb in a passenger car typically has the lowest wattage among the choices below?
• Engine geometry terminology In a “square” engine, which geometric relationship correctly describes the design?
• Programmed fuel injection (PFI) layout Where is the electric fuel pump typically located in a modern PFI system for reliable priming, cooling, and noise reduction?
• Tyre maintenance practice What is the primary purpose of rotating tyres on an automobile at regular service intervals?
• Positive crankcase ventilation (PCV) behavior The PCV valve uses a spring-loaded plunger. Does it open in direct proportion to intake-manifold vacuum level?
• Valve timing terminology Valve overlap is defined as the crank/ cam period during which which condition exists?
• Engine lubrication basics When the engine is shut off and not running, where is the bulk of the engine oil stored/collected?
• Camshaft drive methods General statement check: “The camshaft is driven by the crankshaft via the timing belt.” Is this correct for typical belt-driven engines?
• Wheel alignment — caster angle purpose What is the principal reason for providing a positive caster angle on the steering axis of road vehicles?
• Automotive cooling systems — commonly used antifreeze In passenger-car and light-commercial vehicle engines, which fluid is most commonly used as the antifreeze (mixed with water) for freeze protection, boil-over margin, and corrosion inhibition?
• Power of four-stroke engines — indicated power formula For a single-cylinder four-stroke engine, which expression gives the indicated power in watts (P in N/m^2, L in m, A in m^2, N in revolutions per second)?
• Engine torque characteristic — rise to a peak then fall In real spark-ignition and compression-ignition engines, the torque typically increases with engine speed up to a peak value and then decreases at higher speeds.
• Wheel imbalance — correct rectification method A road wheel that is out of balance should be corrected by which of the following actions?
• Gearbox nomenclature — counting forward ratios A manual transmission that provides four forward speeds and one reverse is commonly described as a:
• Ackermann steering geometry — wheel angles during a turn When a vehicle turns a corner, which statements about the front wheel angles are true?
• Engine lubrication systems — meaning of forced-fed lubrication In a forced-fed lubrication system, oil is delivered to engine bearings and galleries primarily by:
• Air path into the engine — correct intake order Select the correct order in which intake air flows into a typical spark-ignition engine (carburettor or throttle body system).