ASE MLR practice
check the ones after this point
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A vehicle with a power rack and pinion steering system is binding only while turning corners. which of these are least likely to cause this condition?
worn rack bushings can cause a vehicle to wander. this is a least likely type question.
White colored exhaust is billowing from the tailpipe of a vehicle. Which of the following is correct? A. It has worn piston rings. B. It has a leaking head gasket. C. It has worn valve seals. D. It has a leaking fuel injector.
Answer B is correct. A leaking head gasket results in a coolant leak from the jacket into the cylinder producing white/gray exhaust.
a technician notices a swollen oil filter while preforming recommended maintenance on a vehicle's engine. which of the following is the MOST likely the cause of this ballooned oil filter? A) stuck open oil pressure relief valve. B)stuck closed oil pressure relief valve C) stuck open oil filter bypass valve. D) contaminated oil.
B) a stuck closed oil pressure relief valve could cause high oil pressure and a ballooned oil filter
Maintenance free batteries have a built in hydrometer that indicates the batteries state of charge. Technician A says to add distilled water to the battery if the charge indicator turns dark green or black. Technician B says a fully charged battery has a light green charge indicator. Who is correct?
B) is correct a bright green charge indicator indicates a charged battery. / We do not typically add distilled water to a maintenance free battery. It's sealed and contains either a gel or a glass fiber mat instead of the liquid solution found in standard batteries.
A front wheel drive vehicle makes a clacking noise that only occurs while cornering. The technician suspects a faulty front axle. Which of these is MOST likely the cause? A. The inner CV joint. B. The outer CV joint. C. The vibration damper. D. The half shaft is bent.
B) is correct. A faulty or worn outer CV joint makes its most noise while cornering. / A faulty inner CV joint makes most noise during initial acceleration.The damper prevents high speed vibration.The damper prevents high speed vibration.
The tread of a tire is worn in the center and not on the outer shoulders. Technician A says this is caused by an improper wheel alignment angle. Technician B says this is caused by overinflating the tire. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
B) is correct. An overinflated tire wears the center of the tire's tread and an underinflated tire wears the outside edges or "shoulders" of the tire.
All of the following are true about using a multimeter to test a circuit's continuity EXCEPT. A. Set the multimeter to the Ohms setting. B. Turn the ignition on and power the circuit before testing. C. A reading of OL indicates an open circuit. D. A reading of 0.3 Ohms indicates continuity.
B) is correct. Don't power the circuit before testing, a multimeter passes a small amount of current through the device or wire being tested. It then measures the resulting voltage.
a technician runs a scan and receives a fault code indicating a problem in the MAF sensor circuit. technician A says this could be caused by a loose wire or an intermittent open. technician B says this could be caused by a faulty MAF sensor. who is correct?
Both A and B are correct.
the TPMS warning light remains illuminated on a direct tire pressure monitoring system, even after driving the vehicle several miles. the LEAST likely cause of this condition is? A) a faulty TPMS sensor. B) a weak TPMS sensor battery C) low air pressure in the spare tire. D) a faulty wheel speed sensor
D) a faulty wheel speed sensor will affect an indirect TMPS system. a direct TMPS uses sensors placed inside the wheels to sense air pressure.
A technician is bleeding air from a hydraulic power steering system. all of the following statements are true except... A) raise the front tires in the air. B) turn the wheel from stop to stop to bleed air from the system. c)flush with fresh power steering fluid. D) hold the wheel for at least 10 seconds at each steering stop.
D) don't hold the wheel against the steering stops for more than 5 seconds. doing so increases system pressure so high it can rupture hoses and damage system components.
Two technicians are discussing the evaporator's function in an automotive air conditioning system. All of these are true about the evaporator EXCEPT: A. It removes humidity from the air. B. Refrigerant flows from the bottom to the top. C. Refrigerant enters the evaporator as a liquid. D. The refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.
D) is correct. The refrigerant converts from a liquid to a vapor. This is because it boils as it receives heat from the cabin air. Refrigerant has a very low boiling point.
all of the following are true about testing engine coolant EXCEPT: A)An antifreeze hydrometer indicates the coolants boiling point. B) An antifreeze refractometer displays the percentage of coolant to water. C) An antifreeze test strip indicates the coolants PH balance. D) The engine must be brought to operating temperature before testing the coolants boiling point.
D) is correct. practice safely, don't open the cooling system when it is hot. Carefully squeeze the upper radiator hose to check for heat and pressure first. Release the radiator cap to the first notch to make sure there's no residual system pressure.
the break fluid in an ABS break system has become aerated causing a spongy pedal which of these DOT break fluids are MOST likely to cause this condition? A) DOT 2 B) DOT 3 C) DOT 4 D) DOT 5
D) silicone based fluids like DOT 5 can become aerated in a ABS system.
An automatic transmission's fluid is pink and milky. Technician A says this is caused by engine overheating. Technician B says the transmission could have been overfilled and the fluid has become aerated. Who is correct?
No one is correct. Neither technician is correct, the ATF is contaminated with coolant.
the headlights get brighter as the engine is revved. Technician A says this is caused by a high capacity battery. Technician B says this is caused by a faulty voltage regulator. who is correct?
Technician B is correct. at the heart of the charging system is the alternator, if the alternator outputs excessive or high charging voltage, check voltage regulation; electrical components, and electronics will be affected. and because the battery is primarily used to start up the engine.
a vehicles air conditioner blows cold air while driving at normal speeds, but warm while at a stop lights. the LEAST likely cause of this condition is:
a frozen expansion valve: this is the least likely type question. once the expansion valve freezes, the air conditioner would have poor performance at all speeds
a vehicle blows blue gray exhaust from its tailpipe only when first started in the morning. the MOST likely cause of this condition is:
a leaking valve seal will cause oil to leak into the cylinder's chamber over time, usually overnight, resulting in blue gray exhaust at first start.
a vehicles right front wheel has a growling noise that increases with vehicle speed. most likely cause is:
a worn out wheel bearing will cause a growl that increases with speed.
a halogen bulb is being replaced in a headlight system. technician A says to handle the bulb at its base during installation. technician B says to wear gloves or use a piece of paper when handling the glass portion of these bulbs who is correct?
both technicians A and B are correct. / Holding the bulb at its metal base prevents any oil or contaminants from transferring to the delicate bulb. Touching the glass portion of these bulbs leaves damaging oil, even after washing your hands it's recommended to use a glove or a clean paper towel.
a faulty thermometer is being replaced. Technician A says a stuck open thermostat will affect engine performance. technician B says the thermostat controls the engines operating temperature. who is correct?
both technicians A and B are correct. / the thermostat stays closed preventing coolant from flowing to the radiator until a certain point temp is reached, helping the engine reach operating temp quickly. an open thermostat has a negative effect on engine performance.
Technician A says a stuck open PCV valve will cause a lean fuel condition. Technician B says the PCV system removes blowby gases from the crankcase. Who is correct?
both technicians A and B are correct. / A stuck open PCV valve will cause a lean condition, the engine will misfire and the PCM will attempt to adjust the air fuel ratio accordingly. A stuck open PCV valve will cause a lean condition, the engine will misfire and the PCM will attempt to adjust the air fuel ratio accordingly.
all the lights in a break light circuit illuminate except one. the MOST likely cause is: A) an open in the break switch B) a closed break switch c) a burned bulb D) excessive resistance in the circuit.
c) a burned bulb
A technician removes and replaces a worn lower radiator hose on a four cylinder engine. The engine overheats after replacing the hose and adding coolant. Which of these is the MOST likely cause of this condition? A. A faulty ECT sensor. B. A stuck open thermostat. C. An air pocket in the system. D. Electrolysis.
c) is correct. an air pocket has likely formed. water pump cavitation and air pockets cause this condition
a vehicle pulls to the left only while braking. technician A says this could be a restricted left break line. technician B says this could be a frozen right caliper. who is correct?
it is technician B because a frozen right front caliper will cause the vehicle to pull to the left when breaking. and if it were the front break line wit would cause the vehicle to turn right not left. because the right front break has more stopping power.
a hydroboost break system has reduced breaking performance technician A says to check the power steering system. technician B says to check the vacuum check valve. who is correct?
technician A is correct the power steering pump produces pressure for the hydro boost unit.
Technician A says to check the circuits fuse if the actuator is not receiving power. Technician B says if a 15 amp fuse continues to blow to replace it with a 20 amp fuse for added protection. Who is correct?
technician A is correct. A fuse protects a circuit by providing a weak point that will burn open before a sensitive wire or component does. / Replacing a fuse with one of a higher rating is not recommended and will compromise and overload the circuit. If a fuse keeps blowing, suspect a short somewhere in its circuit.
A technician is performing an A/C inspection. The fan is set on high but there is little air flow through the vents. Technician A says this could be caused by a clogged cabin air filter. Technician B says there could be an open in the blower motor's power circuit. Who is correct?
technician A is correct. There's a restriction caused by leaves and debris.
a rear wheel drive vehicle has a loud clunk when a transmission is placed into gear and a vibration that increases with vehicle speed. technician A says this is caused by loose universal joint. technician B says this is caused by an unbalanced driveshaft. who is correct?
technician A is correct. U-joint allow the driveshaft to provide torque to the rear wheels at different angles. loose and worn u-joints will make a clunking noise when the transmission is placed in to gear. they also cause noise and vibration that increases with vehicle speed
a technician measures several spots around a break rotor with an outside micrometer. technician A says the technician is checking the rotor for thickness variation. technician B says the technician is checking the rotor for lateral runout. who is correct?
technician A is correct. measure the break rotor in several different spots for rotor thickness variation. most minimum specifications are stamped inside the rotor
A red colored fluid is seen leaking between the transmission and the engine. Technician A says this is caused by a leaking rear main seal. technician B says this is caused by a leaking transmission pump seal. who is correct.
technician B is correct. a leaking oil pump seal will result in automatic transmission fluid leaking between the engine and transmission bell housing. and transmission fluid is red and oil is tan or brown colored. / a leaking rear mail seal will result in oil leaking between the engine and the transmission bell housing. this would be tan or brown colored.
The serpentine accessory drive belt of an engine squeaks, but appears to be in good condition. Technician A says this could be caused by a faulty idler bearing. Technician B says to check the belt with a belt gauge. Who is correct?
technicians A and B are correct. / Worn idler and tensioner bearings squeak and make noise, but remember newer EPDM belts sometimes don't show cracks and wear like their neoprene predecessors. To check an idler or tensioner bearing remove the belt and inspect for looseness and noise.Using a gauge or belt tension tool is the best way to check belt wear.