AUMT quiz 1

On a vehicle with a manual transmission, the clutch is connected to the ______.

Flywheel

Which of the following properties of synthetic oil is NOT true?

???

A dial caliper is accurate to _____ inch.

0.001

Sludge is being discussed. Technician A says sludge results from the oxidation of oil. Technician B says a slight buildup on the underside of the oil fill cap is normal. Who is correct?

Both Technicians

Oil Coolers are normally found on

High Performance Vehicles

Turning effort [the amount of torque it takes to maintain rotation of a gear or shaft] can be easily measured using a _____type torque wrench.

digital readout

What is the purpose of the valve train?

open and close intake and exhaust ports

The petcock valve is located

At the bottom of the radiator

Which source of information will give you the most detail about a specific system or part?

service manual

Two technicians are discussing the proper coolant to use on a late model GM vehicle. Technician A says that "DEX-COOL" type Organic Acid Technology [OAT] is the proper coolant to use. Technician B says that Ethylene Glycol [good old green] type antifreeze can be used on any vehicle. Who is correct?

A only

Which type of engine is classified as internal combustion?

All automotive engines

Technician A says the American Petroleum Institute has established an oil viscosity classification system. Technician B says thick viscosity oils receive high rating numbers. Who is correct?

B only

Two technicians are discussing a car with a very noisy water pump. The pump makes a lot of noise but is not leaking coolant. Technician A says the owner can continue to drive the vehicle as long as there are no signs on coolant leakage. Technician B says the water pump must be replaced immediately. Who is correct?

B only

Two technicians are discussing testing coolant with test strips. Technician A says the test strip measures freezing protection level. Technician B says the test strip measures coolant acidity.Who is correct?

B only

All the following are types of lifts

Body contact, Wheel contact, Frame contact

An extractor is used for removing broken ______.

Bolts

A vehicle is towed into the shop with a thrown serpentine belt. Technician A checks for a worn pulley bearing. Technician B checks for a faulty tensioner. Who is correct?

Both

Technician A wipes off the outside of a zerk fitting before injecting grease into it. Technician B injects just enough grease to cause the boot to expand slightly. Who is correct?

Both A and B

Directional tires are being discussed. Technician A says directional tires should not be cross rotated, but rotated front to rear. Technician B cross rotates the tires by dismounting them from the rims, flipping them over and remounting. Who is correct?

Both Technicians

During routine service a small amount of engine oil is found in the air cleaner housing. Technician A says the PCV valve may be clogged. Technician B says the engine could be overfilled with oil. Who is correct?

Both Technicians

Hybrid vehicles are being discussed. Technician A says a hybrid can run on electric power or on the internal combustion motor, but never on both. Technician B says the internal combustion engines used in hybrids are specially designed to be assisted by electric power and as a result are more fuel efficient and cleaner than conventional engines. Who is correct?

Both Technicians

OBD II systems are being discussed. Technician A says the system can detect problems even before the driver is aware of a drivability problem. Technician B says when a problem is detected, the system will store a diagnostic trouble code in the vehicle's computer's memory. Who is correct?

Both Technicians

Technician A checks V-belt tension by pressing his thumb firmly on the longest straight span of the belt and measuring the amount of deflection. Technician B uses a belt tension gauge. Who is correct?

Both Technicians

Technician A says V-belts are manually tensioned and require periodic adjustment. Technician B says serpentine belts are normally automatically adjusted. Who is correct?

Both Technicians

Technician A says a bolt may break because the fillet is damaged. Technician B says that a bolt may become fatigued and break if it is undertightened. Who is correct?

Both Technicians

Technician A says a cooling system pressure tester is used to test for leaks in the radiator, hoses, water pump, thermostat, and engine assembly. Technician B say the cooling system pressure tester is used to check the operation of the relief valve in the radiator cap. Who is correct?

Both Technicians

Steering systems are being discussed. Technician A says most passenger cars use a recirculating ball-type mechanism. Technician B says most pickup trucks and SUVs use a rack-and-pinion mechanism. Who is correct?

Neither

A measurement must be made within one ten-thousandth of an inch. Technician A uses a machinist's rule. Technician B uses a standard micrometer. Who is correct?

Neither A or B

Technician A says a tap cuts external threads. Technician B says a die cuts internal threads. Who is correct?

Neither A or B

Technician A says hybrid cars must be plugged in at night to recharge the batteries. Technician B says a hybrid cannot be a high performance vehicle because the electric generator constantly uses energy to recharge the batteries, robbing power from the gasoline engine. Who is correct?

Neither A or B

Technician A torques critical parts using an impact wrench. Technician B torques critical parts with an air ratchet. Who is correct?

Neither A or B

The tensile strength of a metric bolt can be identified by ______.

Numerical Grade Markings

To prevent vibration from loosening the fasteners, locknuts have _____ inserted into a section of the threads.

Nylon

Blue exhaust smoke is an indication of ______.

Oil in combustion chamber

Which of the following is NOT a good reason to replace a belt.

Squealing/Chirping

Technician A says cooling system pressure is controlled by the radiator cap. Technician B says cooling system pressure is controlled by the thermostat. Who is correct?

Technician A

Technician A says cooling system pressure is regulated by the pressure relief valve in the water pump. Technician B says cooling system pressure is regulated by the radiator cap. Who is correct??

Technician A

Technician A says liquid cooling an engine maintains a constant operating temperature. Technician B says that air cooling lets the engine operate more efficiently. Who is correct?

Technician A

Technician A says power brake systems use a vacuum booster to increase the force applied to the master cylinder. Technician B says power brake systems use hydraulic pressure from the power steering pump to increase the force applied to the master cylinder. Who is correct?

Technician A

Hybrid vehicles are being discussed. Technician A says the hybrid batteries are recharged by the engine during normal driving. Technician B say the batteries are recharged when the brakes are applied as the vehicle slows down. Who is correct?

Technician B

Technician A removes rivets with a hammer and screwdriver. Technician B removes rivets with a hammer and punch. Who is correct?

Technician B

Technician A says a torsion bar is a type of shock absorber. Technician B says shock absorbers slow the upward and downward movement of the vehicle after a bump. Who is correct?

Technician B

Technician A says coarse threaded bolts are used where superior holding force is necessary. Technician B says bolts that have rolled threads are 30 percent stronger than bolts with cut threads. Who is correct?

Technician B

The VIN number for vehicles built in the United States begins with _____.

1

Which hose typically has a spiral wire reinforcement?

Lower Radiator

When testing a radiator cap, with the rated pressure applied, the cap should hold that pressure for at least _____.

1 minute

The bolts used to attach an engine sling to the engine must thread into the cylinder head or block _____ times the diameter of the bolt.

1.5

Radial tires should be rotated every _____ miles after being initially rotated at 7,500 miles.

15000

Most manufacturers recommend that cooling systems should be drained, flushed, and filled every ______.

2 to 4 years

For every 1 pound of pressure put on engine coolant, the boiling point of the coolant is raised about _____ degrees Fahreheit degrees (_____ degrees Celsius).

3.25 (1.8)

Minimum concentration of antifreeze is

50/50

The typical recommended mixture of water and antifreeze is ______.

50/50

Ethylene glycol antifreeze is _____.

???

Which of the following components is not a part of an air-conditioning system?

???

A 3/8 inch UNC bolt is being discussed. Technician A says that the bolt diameter is 3/8 inch and that it has 16 threads per inch. Technician B says that the bolt meets the measurement standards developed by the University of North Carolina. Who is correct?

A only

After servicing a hybrid car, the engine will not start. Technician A says the wrong engine oil was installed. Technician B says the wrong type of brake fluid was used. Who is correct?

A only

Technician A says grease fittings are found on parts of the steering system. Technician B says grease fittings are found on parts of the brake system. Who is correct?

A only

NPT stands for ______.

National Pipe Thread

Technician A says a dry sump lubrication system eliminates the possibility of oil sloshing and possible oil starvation during hard cornering, braking, and acceleration. Technician B says a dry sump lubrication system allows the engine to be mounted lower in the frame, improving handling. Who is correct?

Both Technicians

Technician A says a four-wheel drive vehicle uses a transfer case. Technician B says an all wheel drive [AWD] vehicle has a center differential. Who is correct?

Both Technicians

Technician A says a vernier caliper can be used to measure the outside diameter of something. Technician B says a vernier caliper can be used to measure the inside diameter of a bore. Who is correct?

Both Technicians

Technician A says an electric cooling fan may come on at any time without warning, even if the engine is not running. Technician B says an electric cooling fan may be controlled by the engine control computer. Who is correct?

Both Technicians

Technician A says antiseize compound is used to prevent bolts from seizing in aluminum. Technician B says thread sealant is used to prevent leaks. Who is correct?

Both Technicians

Technician A says high crankcase pressure can be caused by worn piston rings. Technician B says low crankcase pressure can be caused by a faulty PCV system. Who is correct?

Both Technicians

Technician A uses a punch to align holes in parts during assembly. Technician B uses a punch to drive out rivets. Who is correct?

Both Technicians

Technician A uses a small hole gauge and micrometer to measure the inside diameters of small bores. Technician B uses a dial caliper to take depth measurements. Who is correct?

Both Technicians

Two technicians are discussing a vehicle with an overheating problem. There are no leaks, internal or external. The belts are in good condition, and the radiator has been removed and flow tested. Everything appears to be in good condition. A new thermostat was installed, but it did not cure the problem. Technician A says the impeller could be slipping on the water pump shaft. Technician B says the impeller blades could be corroded. Who is correct?

Both Technicians

Two technicians are discussing oil filters. Technician A says the oil filter has an anti-drain-back valve that prevents the oil in the filter and engine oil passages from returning to the sump when the engine is shut down. Technician B says the oil filter has a bypass valve that in the event the filter becomes plugged, oil can flow directly to the bearings. Who is correct?

Both Technicians

Two technicians are discussing the measurement of antifreeze concentration in coolant. Technician A uses a coolant hydrometer. Technician B uses a refractomer. Who is correct?

Both Technicians

In most automotive applications, the water pump is driven by the ______.

CRANKshaft

Which component is located in the vehicle's exhaust system?

Catalytic Converter

Water Pumps are _________ style pumps

Centrifugal

What component listed here is not a part of the heating system?

Compressor

During engine warm-up, when the thermostat is closed, _____.

Coolant flows through the bypass

If the engine overheats during long periods of idling but runs normally at highway speeds, the problem is most likely _____.

Defective Cooling Fan

Which of the following tools can be used to test the operation of the thermostat without removing it from the engine?

Digital Infrared Thermometer

To drain a cooling system that does not have a petcock or drain plug in the radiator, ______.

Disconnect the lower radiator hose

Which emission control system introduces exhaust gases into the intake air to reduce the formation of NOX (oxides of nitrogen) in the combustion chamber?

EGR

Which of the following is NOT a typical emission control system?

EPA

Hose sizes are based on their

Inside Diameter

Before replacing a serpentine belt ______.

Located the belt routing diagram on the underhood decal or shop manual; if none is found draw your own

Two technicians are discussing an OBD II vehicle that has a flashing check engine light. Technician A says there is problem with the engine lubrication or cooling system and the vehicle must not be driven, otherwise serious engine damage will occur. Technician B says there is a severe ignition misfire and the driver should reduce speed and engine load and have the vehicle serviced as soon as possible. Who is correct?

Technician B

When installing an oil pump in an engine: Technician A packs the pump with petroleum jelly. Technician B submerges the pump in clean oil and rotates the pump shaft to fill the pump body. Who is correct?

Technician B

Engine power is transferred to an automatic transmission through a ______.

Torque Converter

Which of the following cooling system hoses is normally subjected to the roughest service life?

Upper Radiator

A straightedge and feeler gauge are used to measure _____.

Warpage

Which of the following measurements requires the use of a precision straightedge as well as a feeler gauge?

Warpage

The VIN number includes all the information listed below EXCEPT:

Weight/Tire Size

The tenth character in the VIN is the _____.

Year

If a ball joint has a threaded plug, the plug can be removed and a _____ fitting installed that will allow the ball joint to be greased periodically.

Zerk

The motion of the piston and the rotation of the crankshaft is monitored by the _____ position sensor.

crankshaft

What type of wrench should be used to loosen or tighten brake lines or tubing fittings?

flare nut (line)

Which of the following are the strokes of a four-cycle engine?

intake, compression, combustion(power) exhaust

What component in the cooling system raises the boiling point of the coolant?

pressure cap

Which of the following is a function of the engine's lubrication system?

provides oil to cool, clean, lubricate, and seal engine

If the fan shroud is removed from a vehicle, _____.

the engine will overheat during prolonged idling