Automobile Engineering MCQs 2026

Manual transmission uses

1. A continuously variable pulley only always ✓
2. B selectable gear pairs with clutch disengagement for shifts ✓
3. C hydraulic torque converter lock only always ✓
4. D electric motor only without gears ✓

Synchronizer in manual gearbox matches

1. A engine coolant temperature ✓
2. B brake pad thickness only ✓
3. C speeds of mainshaft gear and clutch shaft before mesh ✓
4. D tyre tread depth only ✓

Automatic transmission typically uses

1. A only manual dog clutch always ✓
2. B only belt CVT exclusively always ✓
3. C no hydraulic control ever ✓
4. D planetary gear sets and torque converter ✓

Torque converter transmits power through

1. A fluid between pump, turbine and stator ✓
2. B direct mechanical lock only always from start ✓
3. C sand friction material only ✓
4. D gear hobbing only ✓

Lock-up clutch in torque converter

1. A disengages engine from wheels always ✓
2. B replaces final drive ✓
3. C eliminates need for gears ✓
4. D mechanically couples pump and turbine at cruising speed ✓

CVT continuously variable transmission varies ratio by

1. A fixed discrete gear teeth only always ✓
2. B changing effective pulley diameters on belt or chain ✓
3. C only manual clutch plate count ✓
4. D only differential pinion size fixed ✓

Overdrive gear ratio is

1. A less than one output turns faster than input ✓
2. B greater than one always ✓
3. C zero always ✓
4. D equal to reverse only ✓

Final drive ratio in vehicle is

1. A gear reduction in differential to drive wheels ✓
2. B steering rack ratio only ✓
3. C brake pedal ratio only ✓
4. D clutch diaphragm spring rate only ✓

Propeller shaft connects

1. A steering wheel to rack only ✓
2. B battery to starter only ✓
3. C radiator to block only ✓
4. D transmission output to differential in rear-wheel drive ✓

Friction clutch in manual car uses

1. A only hydraulic impeller ✓
2. B only worm gear set ✓
3. C only cam and follower ✓
4. D clutch disc between flywheel and pressure plate ✓

Clutch slip occurs when

1. A disc friction surfaces rotate at different speeds ✓
2. B pedal fully released and engaged ✓
3. C gear in neutral always ✓
4. D brakes locked ✓

Dual mass flywheel reduces

1. A steering effort to zero ✓
2. B exhaust emissions completely ✓
3. C torsional vibrations from engine to transmission ✓
4. D need for lubrication ✓

Hydraulic clutch actuation uses

1. A only cable pull always on all cars ✓
2. B only pneumatic sand conveyors ✓
3. C master and slave cylinders to transfer pedal force ✓
4. D only gear synchronizer rings ✓

Differential allows wheels to rotate at different speeds while

1. A locking both wheels always equal speed in turns always ✓
2. B splitting drive torque to both drive wheels ✓
3. C disconnecting engine completely ✓
4. D steering front wheels ✓

Limited slip differential

1. A locks both wheels 100 percent always ✓
2. B eliminates need for axle shafts ✓
3. C only used in steering column ✓
4. D transfers more torque to wheel with traction ✓

Differential gear ratio is typically

1. A steering ratio 15:1 always ✓
2. B brake bias front percent ✓
3. C final drive reduction between pinion and ring gear ✓
4. D tyre aspect ratio ✓

Four-wheel drive adds

1. A only power steering pump ✓
2. B transfer case to distribute power front and rear axles ✓
3. C only catalytic converter ✓
4. D only seat belt pretensioner ✓

Rack and pinion steering converts

1. A steering wheel rotation to linear rack motion turning wheels ✓
2. B engine torque to clutch slip ✓
3. C brake pressure to fuel injection ✓
4. D exhaust gas to intake air ✓

Steering ratio is

1. A road wheel rotation divided by steering wheel rotation ✓
2. B tyre pressure to axle load ✓
3. C final drive gear teeth count only ✓
4. D steering wheel rotation divided by road wheel rotation ✓

Caster angle in wheel alignment provides

1. A maximum tyre wear always intentionally ✓
2. B directional stability and self-centring of steering ✓
3. C only braking force ✓
4. D engine cooling airflow only ✓

Camber angle is

1. A wheel tilt from vertical in front view ✓
2. B toe angle along vehicle axis ✓
3. C caster backward tilt ✓
4. D ackermann only ✓

Toe-in means front of wheels point

1. A slightly toward vehicle centreline ✓
2. B outward away from centreline ✓
3. C straight with zero adjustment only ✓
4. D vertical upward ✓

Power steering assists driver using

1. A only manual worm friction increase ✓
2. B hydraulic or electric actuator on rack or sector ✓
3. C exhaust gas recirculation ✓
4. D flywheel mass increase ✓

Disc brake uses

1. A drum shoes expanding outward only always ✓
2. B engine compression only ✓
3. C calipers squeezing pads against rotating disc ✓
4. D transmission synchro only ✓

Drum brake actuation by wheel cylinder

1. A pulls pads against disc ✓
2. B uses only regen motor ✓
3. C pushes shoes outward against rotating drum ✓
4. D relies on sand friction ✓

ABS prevents wheel lock by

1. A increasing brake pressure continuously until stop ✓
2. B disabling brakes entirely ✓
3. C modulating brake pressure in pulses during hard stop ✓
4. D locking differential only ✓

ABS wheel speed sensor typically uses

1. A only thermocouple exhaust temp ✓
2. B only fuel flow meter ✓
3. C only cam position only in engine bay unrelated ✓
4. D magnetic pickup detecting toothed ring rotation ✓

Brake fade occurs when

1. A cold pads grip too strongly only ✓
2. B tyre inflation increases ✓
3. C steering caster zero ✓
4. D overheated friction material loses coefficient ✓

Master cylinder in hydraulic brakes

1. A only stores vacuum for booster always alone ✓
2. B converts pedal force to hydraulic pressure in lines ✓
3. C cools brake discs with fluid ✓
4. D changes gear ratio ✓

Vacuum brake booster uses

1. A exhaust backpressure only always ✓
2. B engine intake manifold vacuum to amplify pedal force ✓
3. C sand mould vacuum casting ✓
4. D turbo boost pressure directly always ✓

Regenerative braking in hybrid or EV

1. A only friction drums always ✓
2. B uses motor as generator to recover kinetic energy ✓
3. C only sand blasting ✓
4. D only clutch slip always ✓

MacPherson strut suspension combines

1. A coil spring and shock absorber in structural strut ✓
2. B only leaf spring on live axle always ✓
3. C only torsion bar on rear only always ✓
4. D solid axle without springs ✓

Double wishbone suspension provides

1. A only solid beam axle always ✓
2. B no vertical wheel travel ✓
3. C independent control of camber and wheel path ✓
4. D steering rack only ✓

Leaf spring on live axle is

1. A coil over shock only always ✓
2. B semi-elliptic stack supporting axle and locating it ✓
3. C air bag only always ✓
4. D magnetic levitation ✓

Shock absorber dissipates energy by

1. A storing energy in spring only without damping ✓
2. B forcing fluid through orifices or valves resisting motion ✓
3. C generating engine torque ✓
4. D increasing tyre pressure ✓

Anti-roll bar reduces

1. A body roll in cornering by linking left and right suspension ✓
2. B straight line braking distance only ✓
3. C engine vibration only ✓
4. D exhaust noise only ✓

Tyre aspect ratio is

1. A sidewall height as percentage of section width ✓
2. B tread depth in mm only ✓
3. C rim diameter in inches only ✓
4. D inflation pressure in psi only ✓

Ladder frame chassis used in

1. A many trucks and body-on-frame SUVs ✓
2. B unitary monocoque passenger car always only ✓
3. C only motorcycle frame always ✓
4. D only sand casting mould ✓

Monocoque or unitary body chassis

1. A uses separate heavy ladder always on all cars ✓
2. B cannot absorb crash energy ✓
3. C integrates body panels as load-bearing structure ✓
4. D eliminates all spot welding ✓

Subframe mounts

1. A only steering wheel rim ✓
2. B only exhaust tip ✓
3. C engine and suspension to main body isolating NVH ✓
4. D only wiper motor exclusively ✓

Three-way catalytic converter requires

1. A lean burn always above 20:1 always ✓
2. B rich mixture only always ✓
3. C stoichiometric air-fuel ratio near 14.7:1 for gasoline ✓
4. D no oxygen sensor feedback ✓

EGR valve recirculates

1. A fresh air only always ✓
2. B fuel directly to exhaust ✓
3. C coolant to radiator only ✓
4. D portion of exhaust gas to intake to lower combustion temperature ✓

PCV system prevents

1. A oil leak at differential only ✓
2. B brake vacuum loss only ✓
3. C steering fluid overflow only ✓
4. D crankcase pressure and ventilates blow-by gases to intake ✓

EVAP system captures

1. A exhaust particulates only ✓
2. B brake dust only ✓
3. C fuel vapour from tank for combustion in engine ✓
4. D sand mould gases ✓

Lambda or oxygen sensor measures

1. A intake manifold pressure only always ✓
2. B coolant level only ✓
3. C steering angle only ✓
4. D exhaust oxygen content for fuel trim feedback ✓

DPF diesel particulate filter

1. A only gasoline HC ✓
2. B only power steering fluid ✓
3. C only sand silica ✓
4. D traps soot and regenerates periodically at high temperature ✓

Hybrid electric vehicle combines

1. A only manual transmission without motor ✓
2. B internal combustion engine with electric motor and battery ✓
3. C only sand casting plant ✓
4. D only hydraulic press brake ✓

Parallel hybrid drives wheels via

1. A only generator without mechanical drive always ✓
2. B only sand conveyor ✓
3. C engine and motor through common transmission path ✓
4. D only power steering pump ✓

Series hybrid engine primarily

1. A drives generator charging battery for traction motor ✓
2. B drives wheels mechanically always directly ✓
3. C never runs at any speed ✓
4. D replaces suspension springs ✓

Regenerative braking in hybrid stores energy in

1. A fuel tank only ✓
2. B sand mould cavity ✓
3. C high-voltage battery pack ✓
4. D clutch friction surface only ✓

Stop-start system saves fuel by

1. A shutting engine at idle and restarting on demand ✓
2. B running engine faster at idle ✓
3. C locking transmission in reverse ✓
4. D disabling brakes ✓

Battery SOC in hybrid indicates

1. A state of charge of traction battery ✓
2. B steering column angle only ✓
3. C brake pad wear only ✓
4. D tyre camber only ✓

Inverter in hybrid electric drive converts

1. A DC battery to AC for traction motor ✓
2. B mechanical torque to sand only ✓
3. C hydraulic pressure to fuel ✓
4. D exhaust to intake only ✓

Crankshaft position sensor used for

1. A tyre pressure monitoring only ✓
2. B engine timing fuel injection and ignition ✓
3. C seat position memory only ✓
4. D wiper speed only ✓

Idle air control valve regulates

1. A maximum vehicle road speed ✓
2. B final drive ratio ✓
3. C power steering gain only ✓
4. D engine idle speed bypassing throttle plate ✓

Drive-by-wire throttle uses

1. A mechanical cable only always on all new cars ✓
2. B only vacuum advance on distributor always ✓
3. C electronic pedal sensor and motor-driven throttle body ✓
4. D sand binder control ✓

Traction control limits

1. A maximum steering angle always ✓
2. B wheel spin by reducing engine torque or braking spinning wheel ✓
3. C fuel tank capacity ✓
4. D exhaust pipe length only ✓

Electronic stability control ESC

1. A applies individual brakes and reduces torque to prevent yaw loss ✓
2. B only increases engine power in skid always ✓
3. C locks steering column ✓
4. D disables differential always ✓

Airbag deployment triggered by

1. A steering angle only ✓
2. B low fuel warning ✓
3. C high engine RPM only ✓
4. D accelerometer detecting severe deceleration crash signature ✓

Seat belt pretensioner

1. A inflates tyre automatically ✓
2. B changes gear ratio ✓
3. C tightens belt instantly at crash sensing ✓
4. D opens sunroof ✓

Crush zones in body structure

1. A remain rigid transferring all force to occupant ✓
2. B deform progressively absorbing crash energy ✓
3. C only cosmetic panels without structure ✓
4. D increase vehicle mass unnecessarily only purpose ✓

Wheel alignment after suspension work adjusts

1. A engine valve timing only ✓
2. B fuel injector pulse width only ✓
3. C sand moisture only ✓
4. D camber caster and toe to specification ✓

Radial ply tyre construction has

1. A cords at 90 degrees to travel direction in carcass ✓
2. B only bias diagonal plies always ✓
3. C no steel belts ever ✓
4. D solid rubber without air ✓

Tubeless tyre seals air with

1. A inner tube always required ✓
2. B rubber liner and bead seal against rim ✓
3. C sand filling ✓
4. D hydraulic fluid ✓

Power to weight ratio affects

1. A only paint colour ✓
2. B acceleration performance of vehicle ✓
3. C only wiper blade length ✓
4. D only sand grain size ✓

Aerodynamic drag force increases approximately with

1. A square of vehicle speed ✓
2. B linearly with speed only always ✓
3. C inversely with speed ✓
4. D independent of frontal area always ✓

Rolling resistance of tyre depends on

1. A only engine displacement ✓
2. B only steering ratio ✓
3. C tyre construction, inflation and road surface ✓
4. D only catalytic metal only ✓

Oversteer occurs when

1. A front tyres slide before rear tyres ✓
2. B vehicle never rotates in a turn ✓
3. C only straight line motion is possible ✓
4. D rear wheels lose grip before front in turn ✓

Understeer is when

1. A rear slides out first ✓
2. B front tyres lose grip first and vehicle runs wide ✓
3. C all wheels equally infinite grip ✓
4. D brakes fail ✓