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RBSE SS Voc Automotive study materials
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RBSE SS Voc Automotive practice questions

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Question 1Automotive Engine Systems and Overhauling

During a cylinder head inspection, the mechanic measures valve stem-to-guide clearance and finds it exceeds the service limit. Which component should be replaced or reconditioned to restore the correct clearance?

  1. Valve guide Correct answer.
  2. Pushrod
  3. Valve spring
  4. Rocker arm

Explanation

Valve stem-to-guide clearance is controlled by the bore of the valve guide and the diameter of the valve stem. When clearance exceeds the service limit, the guide is worn and must be replaced or reamed oversize with a matching valve. Springs, rocker arms, and pushrods do not set that radial clearance.

Question 2Automotive Engine Systems and Overhauling

A technician is degreeing a camshaft and needs to verify the intake valve opening point. Which specification provides this reference value?

  1. Torque-to-yield bolt stretch
  2. Valve lash hot clearance
  3. Camshaft duration at 0.050 inch
  4. Intake centerline and opening event Correct answer.

Explanation

Cam timing is verified against the manufacturer's intake centerline and opening/closing events, typically checked at a specified lift. These values describe where the cam positions the valve relative to crankshaft rotation. Lash, duration alone, and bolt stretch do not define the opening point.

Question 3Automotive Engine Systems and Overhauling

During a compression test, one cylinder reads significantly lower than the others, but adding a few drops of oil raises the reading to near normal. What does this pattern most strongly indicate?

  1. Blown head gasket between cylinders
  2. Worn piston rings or cylinder wall Correct answer.
  3. Jumped timing chain
  4. Leaking intake valve

Explanation

When oil seals the ring-to-wall gap, compression rises, which points to ring or cylinder bore wear. A leaking valve or head gasket would not be corrected by adding oil because the leak path is above the piston. A jumped chain would affect all cylinders similarly.

Question 4Automotive Engine Systems and Overhauling

What is the primary purpose of the head gasket in an overhead-valve engine?

  1. To retain the camshaft bearings
  2. To drive the oil pump
  3. To seal combustion gases, coolant, and oil between the block and head Correct answer.
  4. To set valve lash automatically

Explanation

The head gasket must seal three different fluids at different pressures and temperatures: combustion gas, coolant, and oil. It also maintains a controlled clamping load across the deck surfaces. Valve lash, cam bearing retention, and oil pump drive are handled by other components.

Question 5Automotive Engine Systems and Overhauling

A torque-to-yield head bolt is being installed. Which procedure is correct?

  1. Torque to yield, then back off one full turn
  2. Torque to a low value, then rotate a specified additional angle Correct answer.
  3. Torque in a single pass from the center outward
  4. Torque to the final value once and reuse the bolt

Explanation

Torque-to-yield bolts are tightened into the plastic region, so the spec is a low initial torque followed by a specified angle of rotation. This produces a consistent clamp load regardless of friction variation. They are generally single-use and should not be reused or backed off.

Question 6Automotive Engine Systems and Overhauling

Which measurement best determines whether a cylinder bore needs to be bored oversize during an overhaul?

  1. Camshaft lobe lift
  2. Taper and out-of-round compared to the service limit Correct answer.
  3. Valve spring free length
  4. Ring end gap in the top groove

Explanation

Cylinder condition is judged by taper, out-of-round, and wear relative to the service limit. If these exceed the limit, the bore is machined oversize and fitted with matching pistons. Ring gap, cam lift, and spring length describe other systems.

Question 7Automotive Engine Systems and Overhauling

During assembly, a plastigage check is performed on a connecting rod bearing. What is being measured?

  1. Bearing crush
  2. Rod bolt stretch
  3. Oil clearance Correct answer.
  4. Journal taper

Explanation

Plastigage is a crushable plastic strip that indicates the oil clearance between the bearing shell and the journal. The flattened width is compared to a scale after the cap is torqued. It does not measure crush, bolt stretch, or taper directly.

Question 8Automotive Engine Systems and Overhauling

An engine has excessive crankshaft end play. Which component controls this clearance?

  1. Rear main seal
  2. Main bearing upper shell
  3. Thrust bearing surface Correct answer.
  4. Rod bearing tang

Explanation

Crankshaft end play is limited by the thrust surfaces, usually on a main bearing shell or a separate thrust washer. The thrust face stops fore-and-aft movement of the crank. Upper shells without thrust faces, rod bearings, and seals do not control end play.

Question 9Automotive Engine Systems and Overhauling

What is the correct purpose of the ring end gap specification during piston installation?

  1. To set the ring radial thickness
  2. To determine the ring groove depth
  3. To allow for thermal expansion of the ring in the bore Correct answer.
  4. To control the piston pin fit

Explanation

Ring end gap allows the ring to expand as it heats without butting ends and scuffing the bore. Too little gap causes breakage; too much causes blowby. Radial thickness, groove depth, and pin fit are separate dimensions.

Question 10Automotive Engine Systems and Overhauling

A hydraulic lifter is noisy at startup and quiets after a few seconds. Which condition is the most likely cause?

  1. Worn piston rings
  2. Excessive valve spring seat pressure
  3. Incorrect camshaft duration
  4. Lifter bleeding down when the engine is off Correct answer.

Explanation

A lifter that bleeds down overnight loses its internal oil charge and must refill before it takes up lash, causing brief noise. Once oil pressure builds, the noise stops. Spring pressure, cam duration, and ring wear do not produce that startup-only pattern.

Question 11Automotive Engine Systems and Overhauling

Which procedure correctly checks valve stem installed height?

  1. Measure the valve overall length on the bench
  2. Measure the spring free length
  3. Measure the rocker arm ratio
  4. Measure from the spring seat to the retainer with the valve seated Correct answer.

Explanation

Installed height is the distance from the spring seat to the underside of the retainer with the valve on its seat. It sets spring installed pressure and must be corrected with shims. Overall valve length, free length, and rocker ratio are different measurements.

Question 12Automotive Engine Systems and Overhauling

During a leak-down test, air escapes continuously from the radiator filler neck with the radiator cap removed. Which defect does this indicate?

  1. Cracked cylinder head or failed head gasket into the cooling system Correct answer.
  2. Worn piston rings
  3. Leaking exhaust valve
  4. Leaking intake valve

Explanation

Bubbles or airflow at the radiator neck show combustion pressure escaping into the coolant passages. This points to a cracked casting or a failed head gasket fire ring. Valve leaks would be heard at the intake or exhaust, and ring wear at the crankcase breather.

Question 13Automotive Engine Systems and Overhauling

Why is a valve seat ground to a specified width and contact position on the valve face?

  1. To control heat transfer and sealing while avoiding seat recession Correct answer.
  2. To increase valve spring installed height
  3. To reduce the rocker arm ratio
  4. To set the camshaft base circle

Explanation

Seat width and contact location balance sealing with heat transfer from the valve head to the head casting. Too wide a seat can cause recession and poor sealing; too narrow overheats the valve. Spring height, rocker ratio, and base circle are unrelated.

Question 14Automotive Engine Systems and Overhauling

An engine is being assembled and the main bearing bores are checked for alignment. Which tool is appropriate for this check?

  1. Feeler gauge on the ring groove
  2. Torque wrench
  3. Dial bore gauge or straightedge with feeler gauge Correct answer.
  4. Micrometer on the valve stem

Explanation

Main bore alignment is checked with a dial bore gauge or a straightedge and feeler gauge across the saddles. Misalignment causes uneven bearing wear and crank binding. A torque wrench, ring groove feeler, and stem micrometer measure other things.

Question 15Automotive Engine Systems and Overhauling

What is the function of the oil pump relief valve in a positive-displacement lubrication system?

  1. To filter metal particles from the oil
  2. To cool the oil before it reaches the bearings
  3. To meter oil to the valve guides
  4. To limit maximum oil pressure by bypassing excess flow Correct answer.

Explanation

A positive-displacement pump delivers flow proportional to speed, so pressure would rise without limit at high rpm. The relief valve opens at a set pressure and bypasses excess oil back to the pan or inlet. Filtration, cooling, and metering are separate functions.

Question 16Automotive Engine Systems and Overhauling

An engine shows low oil pressure at hot idle that rises with rpm. Which condition is most consistent with this symptom?

  1. Clogged oil filter bypass stuck open
  2. Too much oil in the pan
  3. Worn main and rod bearings Correct answer.
  4. Faulty oil pressure sending unit only at cold start

Explanation

Worn bearings increase the clearance the pump must fill, so pressure drops most at hot idle when pump speed and oil viscosity are lowest. It recovers as rpm rises. A filter bypass, a sender fault, and overfilling do not produce this pattern.

Question 17Automotive Engine Systems and Overhauling

Which cooling system component is responsible for maintaining a minimum operating temperature by restricting coolant flow to the radiator?

  1. Water pump
  2. Cooling fan
  3. Radiator cap
  4. Thermostat Correct answer.

Explanation

The thermostat opens and closes with temperature, blocking radiator flow until the engine warms and then regulating flow to hold the design temperature. The pump circulates coolant, the cap sets system pressure, and the fan moves air.

Question 18Automotive Engine Systems and Overhauling

A vehicle overheats at highway speed but stays normal in stop-and-go traffic. Which cause is most likely?

  1. Inoperative electric cooling fan
  2. Low coolant concentration of antifreeze
  3. Faulty thermostat stuck open
  4. Restricted radiator airflow or a partially plugged radiator core Correct answer.

Explanation

At highway speed the engine load and heat rejection are high, so a restricted radiator or airflow path cannot keep up. Stop-and-go relies more on the fan and lower load, masking the restriction. A dead fan would worsen low-speed cooling, not highway behavior.

Question 19Automotive Engine Systems and Overhauling

What is the correct order for a typical valve clearance adjustment on an overhead-valve engine with adjustable rockers?

  1. Adjust each valve when its cylinder is at TDC on the compression stroke Correct answer.
  2. Adjust all valves with the engine at any position
  3. Adjust only exhaust valves with the engine cold
  4. Adjust valves with the engine running at high rpm

Explanation

Each valve is adjusted when its lifter is on the base circle, which for a given cylinder occurs at TDC on the compression stroke. The intake and exhaust for that cylinder are then fully closed. Adjusting at random positions risks setting lash on the ramp.

Question 20Automotive Engine Systems and Overhauling

Which condition would cause a valve to burn or tulip during service?

  1. Too much valve spring installed height
  2. Insufficient valve lash preventing the valve from seating Correct answer.
  3. Incorrect rocker arm ratio
  4. Excessive valve lash holding the valve off its seat

Explanation

A valve that cannot fully seat cannot transfer heat to the seat and head, so it overheats and can burn or tulip. Insufficient lash or a tight clearance holds the valve slightly open. Excessive lash, spring height, and rocker ratio do not cause this failure mode.

Question 21Automotive Engine Systems and Overhauling

What does the term "valve float" describe at high engine speed?

  1. The valve seat receding into the head
  2. The valve failing to follow the cam profile because spring force is insufficient Correct answer.
  3. The lifter collapsing at idle
  4. The valve stem seizing in the guide

Explanation

At high rpm the valvetrain's inertia can exceed spring force, so the valve loses contact with the cam and does not follow the intended profile. This causes power loss and possible piston-to-valve contact. Seizing, seat recession, and idle lifter collapse are different faults.

Question 22Automotive Engine Systems and Overhauling

A technician finds coolant in the engine oil after an overhaul. Which assembly error is most likely responsible?

  1. Oil pump relief valve installed backward
  2. Piston ring gaps aligned in a line
  3. Incorrect spark plug gap
  4. Head gasket installed upside down or a damaged fire ring Correct answer.

Explanation

Coolant enters the oil when the head gasket seal fails at a coolant passage or fire ring. Reversed gaskets, damaged rings, or incorrect torque can cause this. The relief valve, ring gap alignment, and plug gap do not create a coolant-to-oil path.

Question 23Automotive Engine Systems and Overhauling

Which measurement should be taken to verify connecting rod bend and twist?

  1. Rod length between centers on a rod aligner Correct answer.
  2. Piston pin diameter
  3. Rod bore diameter with a micrometer
  4. Crankshaft journal taper

Explanation

Rod bend and twist are checked on a rod aligner, which compares the pin bore axis to the big-end bore axis. Measuring bore diameter, pin diameter, or journal taper does not reveal the angular distortion. A bent rod must be reconditioned or replaced.

Question 24Automotive Engine Systems and Overhauling

What is the primary reason for honing a cylinder after boring during an overhaul?

  1. To set the main bearing crush
  2. To increase the compression ratio
  3. To reduce the piston pin bore size
  4. To produce the correct crosshatch for oil retention and ring seating Correct answer.

Explanation

Honing creates a controlled crosshatch pattern that retains oil and helps rings seat while removing boring tool marks. It does not change compression ratio, pin bore size, or bearing crush. The final bore size is also established by honing.

Question 25Automotive Engine Systems and Overhauling

An engine has a persistent misfire on one cylinder with good spark and fuel. A running compression test shows low pressure on that cylinder that does not improve with oil. Which additional test best isolates the cause?

  1. Fuel pressure drop test
  2. Cylinder leak-down test to locate the leak path Correct answer.
  3. Battery load test
  4. Alternator output test

Explanation

A leak-down test introduces air at TDC and locates where it escapes: intake, exhaust, crankcase, or coolant. That pinpoints a valve, ring, or gasket fault. The other tests address electrical or fuel delivery systems that are already known to be functioning.

Question 26Automotive Engine Systems and Overhauling

An engine is brought in with a seized camshaft. During teardown the technician finds the cam bearings installed with their oil holes facing away from the block feed galleries. What is the direct consequence of this error?

  1. The camshaft journal receives no pressurized oil and the bearing seizes Correct answer.
  2. Camshaft end play increases beyond specification
  3. Valve spring installed height becomes excessive
  4. The timing chain tensioner loses its oil supply

Explanation

Cam bearings must be indexed so their oil feed holes align with the gallery in the block; otherwise pressurized oil cannot reach the journal-to-bearing clearance. Without that oil film the bearing and journal run metal-to-metal and seize. End play, spring height, and tensioner feed are controlled by other components and are not affected by bearing hole orientation.

Question 27Automotive Engine Systems and Overhauling

A cylinder head is being assembled and the technician must identify the function of the valve guide in an overhead-valve engine. Which statement describes its primary job?

  1. It transfers heat from the valve spring into the coolant jacket
  2. It seals combustion pressure against the port floor
  3. It positions the valve stem so the valve face meets the seat concentrically Correct answer.
  4. It meters oil flow to the rocker arm pivot

Explanation

The valve guide locates the stem and keeps the valve moving in a straight line so the face contacts the seat evenly around its full circumference. Correct guidance is what allows the valve to seal and to transfer heat through the seat. Sealing is the seat's job, and oil metering to the rocker is handled by the oiling system.

Question 28Automotive Engine Systems and Overhauling

During an overhaul the technician measures the valve spring free length and finds it below the service limit. Which effect on engine operation should be expected if the springs are reused?

  1. Loss of valve control and possible valve float at high speed Correct answer.
  2. Reduced camshaft bearing loading
  3. Increased valve lift at high rpm
  4. Lower closed valve seat pressure with better low-lift flow

Explanation

A spring that has taken a set delivers less seat and open pressure than designed, so the valvetrain cannot follow the cam profile at higher speeds. The result is valve float, lost compression, and possible valve-to-piston contact. Spring pressure does not increase lift or improve sealing; it only controls the valve.

Question 29Automotive Engine Systems and Overhauling

A technician is checking a cylinder head for warpage before resurfacing. Which measurement practice gives a valid flatness reading?

  1. Measure across the combustion chambers with a dial caliper
  2. Check flatness with a machinist's square at the ends of the head
  3. Lay a straightedge diagonally only and measure the largest gap with a feeler gauge
  4. Check the head with a precision straightedge at several positions and directions and measure gaps with a feeler gauge Correct answer.

Explanation

Flatness is verified with a precision straightedge placed at multiple locations and in multiple directions, including edge-to-edge and diagonal, with feeler gauge measurement of any gap. Checking only one direction or using the wrong tool can miss a low area. A caliper or square does not measure surface flatness.

Question 30Automotive Engine Systems and Overhauling

An engine is assembled with new pistons and the technician must orient the piston on the connecting rod. Which statement is correct for a typical press-fit or full-floating arrangement?

  1. The piston front mark must face the front of the engine and the rod oil squirt hole or bearing tang must be positioned per the service information Correct answer.
  2. The piston ring gaps must all be aligned on the thrust side
  3. The piston valve reliefs must face the rear of the engine
  4. The connecting rod may be installed in either direction as long as the cap number matches

Explanation

Pistons carry a front or arrow mark that must face the front of the engine, and the rod must be oriented so its oil squirt hole and bearing tangs are correct for that bank. Rod caps must match their rod and be installed the correct way round. Ring gaps are staggered, never aligned, and are not placed on the thrust side by design.

Question 31Automotive Engine Systems and Overhauling

A rebuilt engine has a rhythmic tapping noise that is loudest when cold and fades as the engine warms, coming from the top of one cylinder bank. A check of valve clearance shows one rocker with excessive clearance. Which condition best explains this?

  1. A worn main bearing
  2. A sticking thermostat
  3. Incorrect valve lash adjustment on that rocker Correct answer.
  4. Low transmission fluid

Explanation

Excessive valve lash produces a distinct top-end tap that changes with temperature as clearances change, and the noise is localized to the affected rocker. Adjusting lash to specification is the corrective action. Main bearing noise is a deeper knock from the lower end, and a thermostat or transmission fluid has no effect on valvetrain noise.

Question 32Automotive Engine Systems and Overhauling

A technician is degreeing a camshaft during assembly. Which measurement verifies that the cam is installed in its correct relationship to the crankshaft?

  1. Intake centerline using the intake lobe and a degree wheel with the number one piston at top dead center Correct answer.
  2. Camshaft lobe lift at maximum
  3. Camshaft end play with a dial indicator
  4. Valve spring installed height

Explanation

Degreeing the cam means locating the intake lobe centerline relative to the crankshaft position, typically using a degree wheel and a dial indicator on the lifter with the piston at TDC. This confirms the cam is advanced, retarded, or on the intended intake centerline. Lobe lift, end play, and spring height are separate checks.

Question 33Automotive Engine Systems and Overhauling

An engine is being pre-oiled before first start after an overhaul. Which practice best protects the bearings during initial cranking?

  1. Start the engine immediately at high idle to splash oil to the top end
  2. Crank the engine with the ignition disabled until oil pressure is indicated, or prime with a pressure primer through the gallery Correct answer.
  3. Fill the crankcase with solvent and crank briefly
  4. Coat only the cam lobes with assembly lube and start normally

Explanation

Pre-oiling fills the galleries and filter and establishes pressure before the bearings see load, either by cranking with ignition disabled or by driving a primer through the oil gallery. Assembly lube supplements this but does not replace priming. Solvent would dilute the oil, and high idle at first start risks damage before oil reaches the bearings.

Question 34Automotive Engine Systems and Overhauling

A technician is checking connecting rod side clearance during assembly. Which statement describes the purpose of this clearance?

  1. It controls piston-to-valve clearance
  2. It allows oil to escape from the rod bearing to control pressure
  3. It allows the rod to float on the journal and prevents binding between the rod and crank cheek Correct answer.
  4. It sets the bearing crush on the rod cap

Explanation

Rod side clearance is the axial gap between the rod big end and the crankshaft cheek, allowing the rod to align itself on the journal without binding. Too little clearance causes heat and scoring; excessive clearance can affect oil control. Bearing crush is set by cap torque and bearing shell design, not by side clearance.

Question 35Automotive Engine Systems and Overhauling

A cylinder head is being reassembled and the technician must torque the head bolts. Which sequence and method is correct for a typical cast iron block with a composite gasket?

  1. Tighten each bolt fully in numerical order in one pass from the center outward
  2. Tighten from the outside toward the center in one pass
  3. Tighten all bolts to final torque in any order, then recheck once
  4. Tighten in stages, starting at the center and working outward in a spiral, reaching final torque in the last pass Correct answer.

Explanation

Head bolts are tightened in stages and in a spiral pattern starting from the center so the gasket is compressed evenly and the head is not distorted. One-pass or outside-in sequences can leave uneven clamping and cause leaks or warpage. Torque-to-yield bolts also require the specified torque-plus-angle procedure.

Question 36Automotive Engine Systems and Overhauling

An engine uses torque-to-yield (TTY) head bolts. Which practice is required when these bolts are removed during an overhaul?

  1. Replace the bolts with new ones of the specified grade, because they have been stretched past yield Correct answer.
  2. Reuse the bolts if they are within length specification and show no thread damage
  3. Reuse the bolts if the engine has not overheated
  4. Reuse the bolts only after chasing the threads and applying thread locker

Explanation

TTY bolts are tightened past their elastic limit and permanently stretch, so they cannot reliably reproduce the specified clamp load on reuse. Service information calls for new bolts and often a torque-plus-angle procedure. Thread condition or overheating history does not restore the bolt's elastic properties.

Question 37Automotive Engine Systems and Overhauling

A technician is diagnosing an engine that consumes oil but shows no external leaks and no blue smoke at idle. A wet and dry compression test shows normal, even readings. Which cause is most consistent with these findings?

  1. A restricted PCV system drawing oil into the intake Correct answer.
  2. A blown head gasket
  3. Worn piston rings
  4. Failed valve stem seals or worn valve guides

Explanation

A restricted or incorrectly routed PCV system can pull oil vapor and liquid oil into the intake, raising consumption without blue smoke at idle or low compression. Normal even compression argues against ring and valve sealing faults. A head gasket failure would normally show compression or cooling system symptoms.

Question 38Automotive Engine Systems and Overhauling

During an overhaul the technician must verify crankshaft journal taper and out-of-round. Which measurement approach is correct?

  1. Check journals with a Plastigage strip
  2. Measure journal diameter once at the center with a caliper
  3. Measure journal length with a depth micrometer
  4. Measure each journal at two positions 90 degrees apart with a micrometer and compare with specification Correct answer.

Explanation

Taper and out-of-round are found by measuring each journal at multiple points around its circumference, typically two readings 90 degrees apart, and comparing the difference with specification. A single caliper reading cannot reveal shape error, and Plastigage measures bearing clearance rather than journal geometry.

Question 39Automotive Engine Systems and Overhauling

An engine is assembled and the technician finds that the timing marks on the crank and cam sprockets do not align as specified. What is the most likely result if the engine is started?

  1. The engine will idle smoothly but lose top-end power only
  2. Valve timing will be incorrect, causing poor running and possible valve-to-piston contact Correct answer.
  3. Oil pressure will be low at idle
  4. The cooling fan will not engage

Explanation

Cam-to-crank timing determines when valves open relative to piston position; misalignment causes incorrect valve events and, in interference engines, valve-to-piston contact. The engine may not start at all or may run poorly. Oil pressure and fan operation are unrelated to cam timing.

Question 40Automotive Engine Systems and Overhauling

A technician is inspecting a cylinder head and finds a valve seat that is recessed below the surrounding chamber surface after grinding. Which consequence should be expected?

  1. Reduced valve spring installed height and possible spring coil bind Correct answer.
  2. Increased spring installed height and reduced seat pressure
  3. Improved valve cooling and sealing
  4. No effect, because seat recession is normal after grinding

Explanation

Grinding a seat sinks the valve deeper into the head, which reduces the installed height of the spring and can lead to coil bind or loss of seat pressure. The correction is to grind the valve stem tip or replace the seat so installed height returns to specification. Recession does not improve cooling or sealing.

Question 41Transmission, Driveline, Steering and Suspension

In a manual transmission, what is the primary function of the synchronizer assembly?

  1. To lock the differential during straight-line driving
  2. To maintain constant hydraulic pressure in the clutch circuit
  3. To equalize the rotational speed of the gear and the output shaft before engagement Correct answer.
  4. To multiply engine torque before it reaches the countershaft

Explanation

Synchronizers use cone-shaped friction surfaces to bring the engaging gear and the shaft sleeve to matching speed, which prevents gear clash during a shift. They do not multiply torque or affect differential locking.

Question 42Transmission, Driveline, Steering and Suspension

A vehicle with a transversely mounted engine and a conventional open differential has one front wheel on ice and one on dry pavement. What happens when the driver accelerates gently?

  1. The differential locks automatically and both wheels turn at the same speed
  2. The engine stalls because the differential cannot transfer any torque
  3. The wheel on ice spins because torque follows the path of least resistance Correct answer.
  4. Both wheels receive equal torque and the vehicle moves normally

Explanation

An open differential splits torque equally between both side gears, so the total tractive effort is limited by the wheel with less grip. The low-traction wheel therefore spins while the other receives only the same small torque.

Question 43Transmission, Driveline, Steering and Suspension

Which component allows the front wheels to steer while transmitting drive torque to them on a front-wheel-drive vehicle?

  1. A sway bar link
  2. A Pitman arm
  3. A constant-velocity (CV) joint Correct answer.
  4. A leaf spring shackle

Explanation

CV joints permit the driveshaft to transmit torque through a varying angle as the wheels steer and the suspension moves. Leaf spring shackles, Pitman arms, and sway bar links are suspension or steering components that carry no drive torque.

Question 44Transmission, Driveline, Steering and Suspension

What is the purpose of setting proper toe-in on the front wheels of a rear-wheel-drive vehicle?

  1. To reduce the camber angle to zero under load
  2. To shorten the turning radius of the vehicle
  3. To increase the caster angle for better straight-line stability
  4. To compensate for the tendency of the wheels to splay outward as the vehicle rolls forward Correct answer.

Explanation

Toe-in preloads the wheels slightly inward so that running forces and suspension compliance bring them parallel during motion, reducing tire scrub. It does not alter caster, camber, or turning radius directly.

Question 45Transmission, Driveline, Steering and Suspension

Which symptom most directly indicates a worn inner CV joint on a front-wheel-drive vehicle?

  1. A pulsation in the brake pedal during hard stops
  2. A clunk heard only when the brakes are applied
  3. A constant squeal that increases with vehicle speed regardless of throttle
  4. A vibration felt through the steering wheel during acceleration that diminishes when coasting Correct answer.

Explanation

A worn inner CV joint typically produces vibration or shudder under acceleration because torque load amplifies play in the joint, and the symptom eases when the load is removed. Constant speed-related noise or brake-related pulsation points to other components.

Question 46Transmission, Driveline, Steering and Suspension

In a rack-and-pinion steering system, what does the pinion gear do?

  1. It converts rotational input from the steering column into linear movement of the rack Correct answer.
  2. It multiplies engine torque for the power steering pump
  3. It locks the steering column when the key is removed
  4. It adjusts the camber angle during cornering

Explanation

The pinion gear meshes with the toothed rack, so rotating the steering wheel drives the rack sideways and moves the tie rods. This converts rotary motion into the linear motion needed to steer the wheels.

Question 47Transmission, Driveline, Steering and Suspension

A vehicle pulls to the right while driving on a level road with correct tire pressures. Which condition is the most likely cause?

  1. Too much toe-in on both front wheels equally
  2. Worn rear shock absorbers
  3. Unequal camber or caster between the left and right front wheels Correct answer.
  4. Excessive positive caster on both front wheels

Explanation

A pull to one side usually results from a side-to-side difference in camber or caster, which creates an unbalanced steering force. Equal settings on both sides, such as matched caster or matched toe, do not produce a directional pull.

Question 48Transmission, Driveline, Steering and Suspension

What is the function of a slip joint in a rear-wheel-drive driveshaft?

  1. To absorb engine torque spikes
  2. To change the final drive ratio at highway speed
  3. To disconnect the driveshaft during gear changes
  4. To allow the driveshaft length to change as the suspension moves Correct answer.

Explanation

The slip joint lets the driveshaft change effective length as the rear axle moves up and down, preventing binding or thrust loads on the transmission and differential. It does not change ratio or disconnect the driveline.

Question 49Transmission, Driveline, Steering and Suspension

A customer reports a whining noise from the rear axle that is loudest during acceleration and quieter during coast. What is the most likely cause?

  1. Low tire pressure on the rear tires
  2. A failed rear wheel bearing
  3. Worn ring-and-pinion gear set with incorrect backlash or wear pattern Correct answer.
  4. Worn rear brake pads

Explanation

Ring-and-pinion noise typically changes with throttle load because the gear teeth are loaded on the drive side during acceleration and the coast side during deceleration. Wheel bearing noise tends to be more constant and speed-related rather than load-dependent.

Question 50Transmission, Driveline, Steering and Suspension

Which alignment angle is defined as the forward or rearward tilt of the steering axis?

  1. Thrust angle
  2. Caster Correct answer.
  3. Camber
  4. Toe

Explanation

Caster is the tilt of the steering axis in the longitudinal plane, viewed from the side of the vehicle. Positive caster improves straight-line stability and steering return.