Mech Tech #4 Final
____ is achieved using planetary gears in an automatic transmission with a lock-up torque converter (except for Honda and Acura transmissions)
Overdrive
The decide that is MOST-Likely used to prevent the emission of hydrocarbons (blowby gases) from the crankcase by scavenging them and reintroducing them into the combustion chambers is:
PCV system
If a battery that is in good condition continually goes dead, there may be a circuit that is causing the drain when everything is supposed to be off. This is MOST-Likely referred to as:
Parasitic load
Normal suspension systems are MOST-Likely referred to as:
Passive systems
The sensor that MOST-Likely uses a beam of light to control the primary circuit is the:
Photoelectric sensor
____ is a product used to measure oil clearance in bearings and oil pumps
Plastigage
Which of the following is LEAST-Likely a source of emissions?
Plenum
Which of the following is LEAST-Likely one of the three main parts of an automotive computer system?
Plenum
Which of the following statements is LEAST-Likely true?
Power steering reservoirs are made of steel
Technician A says that coolant is a 50/50 mixture of antifreeze and water. Technician B says that coolant and antifreeze are the same thing. Who is correct?
B only
While discussing drill bits, Technician A says that a drill bit that is sharpened "off center" will drill a hole that is too small. Technician B says that it will drill a hole that is too large. Who is correct?
B only
While discussing thermostats, Technician A days that the installation of a lower temperature rating thermostat will result in a cooler running engine. Technician B says that it will simply result in the engine operating temperature being lower during cooler weather. Who is correct?
B only
While having a discussion, Technician A says that BMW active steering uses a planetary headset between the steering wheel and the steering gear. The input is the planetary carrier and the output is the sun gear. Technician B says that the input is the sun gear and the output is the planetary gear. Who is correct?
B only
While having a discussion, Technician A says that Newer ignition systems have variable dwell. At low engine rpm, dwell is longer and at higher rpm it will be shorter. Technician b says that at low engine rpm, dwell is shorter and at higher rpm, it will be longer. Who is correct?
B only
While having a discussion, Technician A says that a Hall-effect signal generates an AC signal. Technician B says that it does not generate a signal, rather it's signal is a rise in voltage, followed by a drop in voltage. Who is correct?
B only
While having a discussion, Technician A says that a typical front-wheel-drive transmission, fourth gear would be accomplished by locking the input shaft to the output shaft for a 1:1 ratio. Technician B says that this occurs in a typical rear-wheel-drive. Who is correct?
B only
The park that MOST-Likely connects the steering linkage parts is the
Ball socket
Which of the following is LEAST-Likely a component of the suspension system?
Bearings
While having a discussion, Technician A says that SLA suspensions maintain precise wheel position under all driving conditions. Technician B says that they can have a large amount of vertical travel without scrub. Who is correct?
Both A and B
While having a discussion, Technician A says that a desiccant becomes saturated when it becomes full of water. Technician B says that on a day with 80% humidity, a desiccant can become completely saturated if left fully open to the atmosphere for as little as 10 minutes. Who is correct?
Both A and B
While having a discussion, Technician A says that you should never install undersized tires on a vehicle. The vehicle will be lower and the speedometer will no longer be accurate. Technician B sad that the increase in engine rpm for a given speed will result in a decrease in fuel economy. Who is correct?
Both A and B
The term MOST-Likely used to describe an event that occurs when the engine reaches operating temperature and the computer starts acting upon information received from the O2 sensor is:
Closed loop fuel control
Which of the following is LEAST-Likely to cause heat transfer?
Humidity
Which of the following statements is LEAST-Likely true?
Hypalon has better high temperature resistance than Silicone
Which of the following statements is LEAST-Likely true?
If the voltage regulator allows the alternator to overcharge the battery, the water level will increase
All of the following statements about the hydraulic braking system are true EXCEPT:
In order to increase the pressure coming from the master cylinder, the diameter of its bore must be larger
As pushrods, rocker arms, and other valvetrain parts wear, lash ____
Increases
Which of the following statements is LEAST-Likely a type of pump?
Inlet type
A(n) ____ vacuum is used to sense the load on the engine
Intake manifold
All of the following statements are true EXCEPT:
Kevlar is more resistant to heat than Graphite
Which of the following is LEAST-Likely to be found in the lubrication service manual?
Maintenance schedule
All of the following statements are true EXCEPT:
Maximum power assist occurs at 15 rpm (fast idle) while the vehicle is at rest
A casualty of the computer revolution is the ____. Although it is still available from some service literature providers, it has largely been replaced by computers and has become uncommon.
Microfiche
While discussing air compressors, Technician A days that air pressure should be regulated to 40 psi in order to get the best performance and reliability from air tools. Technician B says that air pressure should be regulated at 60 psi
Neither A nor B
While having a discussion, Technician A says that a compression test will tell the condition of oil control rigs and compression rings. Technician B says that the compression test will only tell the condition of compression rings. Who is correct?
Neither A nor B
While having a discussion, Technician A says that a coolant position sensor attached to a throttle body on the air inlet senses how many degrees the throttle plate is open. Technician B says that an air charge temperature sensor senses how many degrees the throttle plate is open. Who is correct?
Neither A nor B
While having a discussion, Technician A says that a typical GM vehicle air conditioner is rated at about 5,000 Btus. Technician B says that it is rated at about 10,000 Btus
Neither A nor B
While having a discussion, Technician A says that automatic hubs always disengage when four-wheel drive is shut off. Technician B says that they only work in reverse. Who is correct?
Neither A nor B
All of the following statements are true EXCEPT:
New electrolyte, which is approximately 75% acid and 25% water (by volume), is contained in a large plastic bag inside a sturdy cardboard box
Which of the following statements is LEAST-Likely true?
The greatest torque gain will occur in the first hour of operation of a rebuilt engine
All of the following are components of a simple planetary gear EXCEPT:
The impact socket
All of the following statements are true EXCEPT:
The refrigerant's boiling temperature becomes lower when it is pressurized
Which of the following statements is LEAST-Likely a component of the differential?
Thinwall
All of the following statements are true EXCEPT:
Today's oils allow the formation of sludge
The use of a poor grade of fastener, too much friction, or an improper threat fit is MOST-Likely to occur when the assembly is not properly:
Torqued
The ____ is the section of the tire that rides on the road
Tread
A belt that is too long can rub on a radiator hose or fuel line after tension is adjusted
True
Aerated oil does not provide for sufficient oil pressure and can result in collapsed hydraulic lifters, or even a broken crankshaft
True
Battery service includes replenishing water (some batteries) and service to the terminals and clamps
True
Both ends of a combination wrench are the same size. One end is a box wrench and the other end is an open-end wrench
True
CO2 is a greenhouse gas that traps heat in the atmosphere
True
Comprehensive generic repair manuals include sections for each make of car arranged in alphabetical order by maker
True
Fluid that meets DOT 3 or DOT 4 specifications can be used in drum and disc systems
True
Poor quality fuel blowby, and EGR gases can cause a funny deposit buildup behind the throttle plate
True
Replacement joints usually have a zerk fitting for lubrication during service
True
Resistance at the cable connections is a major cause of starting system problems
True
Sealants and flushing agents are bad for air-conditioning systems
True
Most cars have a single drive shaft, but vehicles with a longer wheel base will MOST-Likely have a:
Two-piece drive shaft
The MOST-Likely service literature to be updated with the new material each year is the:
Underhood emission control label
All of the following statements are true EXCEPT:
Vacuum leaks are located while the engine is on with the throttle closed
The term MOST-Likely used to describe a sensor that takes place of the governor and frequently sends to the computer an output voltage that varies with road speed is:
Vehicle speed sensor
All of the following statements are true EXCEPT:
With 70°F air entering the evaporator, expect about a 20°F drop in air temperature (10°F)
All of the following statements are true EXCEPT:
You do not need to wear gloves, but face protection is a must when working around caustics
The organization that is MOST-Likely to decide when new oil specifications are needed is:
the SAE
A flexplate and torque converter are used with manual transmissions instead of a flywheel
False
A four-stroke engine produces equal torque at all times
False
A hammer is used to secure a bearing to a shaft or hold it inside of a housing
False
Advantages of rear-wheel drive include reduced weight and a more efficient drivetrain, resulting in better fuel economy
False
Airflow through the engine is changed by opening the vacuum gauge
False
Beginning in 1985, Ford, General Motors, and Chrysler began to use metric fasteners in some locations on their vehicles
False
Ceramic linings are organic linings with sponge iron and steel fibers mixed into them to add strength and temperature resistance
False
Either carbon dioxide (CO2) or a dry chemical fire extinguisher can be used on Class D fires
False
Independent suspension systems have more inspiring weight than rigid axle suspensions
False
Random access memory (RAM) is permanently programmed information available to the microprocessor
False
The spark created by the ignition system must be delivered to the correct spark plug at a specified point after TDC
False
To anneal metal, it is heated to a specific temperature and then quenched
False
Viscosity, which is measured at 212F (100C), is lower of the oil is thicker
False
When a battery is low on water, it has very little internal resistance
False
All of the following statements are true EXCEPT:
Fuel injection systems require small, heavy-duty filters
All of the following statements are true EXCEPT:
Gear flow is from the input shaft to the clutch disc
The technology that MOST-Likely blends computers and wireless telecommunications, combining global positioning satellite (GPS) tracking and other wireless communications for automatic roadside assistance and remote diagnostics is:
Telematics
The MOST-Likely part used to prevent belts from sagging in the middle is:
Tensile cord
Which of the following statements is LEAST-Likely true?
The cam and lifters become wear-mated after the first few weeks the engine is run
When adjusting a new V-belt, set the tension about ____ pounds higher than the recommended specification
15
Which of the following statements is LEAST-Likely to be true?
2 liters are equal to about 159 cubic inches
Each of the following represent common sizes of extensions EXCEPT:
2"
In ____ power flows through a locked planetary gearset to the mainshaft and to the rear differential
2-wheel-drive high range (2H)
The boiling point of water is ____ at sea level
212°F
Which of the following is LEAST-Likely to be the HS drill speed when drilling mild steel?
300 rpm for 1/2"
The by-pass valve on most passenger car oil filters will open when resistance to flow reaches about ____.
8 psi
Running compression should MOST-Likely be about:
80% of cranking compression
All of the following statements are true EXCEPT:
A fan clutch increases horsepower requirements
Which of the following statements is LEAST-Likely true?
A fluid coupling has straight blades and provides torque increase
All of the following statements are true EXCEPT:
A knock sensor has a piezoelectric crystal sensing element that senses vibration and creates a voltage signal of 100 to 200 mV
Which of the following statements is LEAST-Likely true?
A master cylinder has four ports for each piston
Technician A says that with the engine off, most good batteries can provide about 25 amperes for 2 hours before discharging to the point where the engine will not start. Technician B says that most batteries can provide about 10 amperes for 30 minutes. Who is correct?
A only
While having a discussion about the Ravignneaux gearset, Technician A says that in overdrive, the direct clutch drives the planetary carrier clockwise, causing the long pinions to walk clockwise around the held large sun gear. Technician B says this occurs in third gear. Who is correct?
A only
While having a discussion, Technician A days that A multi-vis oil helps to combat engine wear because it flows more quickly to the bearings when the engine is first started. Technician B says that multi-vis oil actually accelerates engine wear. Who is correct?
A only
While having a discussion, Technician A says that a glazed belt must be replaced because it will not grip the pulley tightly. Technician B says that if the tension is at its specification there is no need to replace it. Who is correct?
A only
While having a discussion, Technician A says that in a diode, holes flow in the direction of the arrow, while electrons go against the arrow. Technician B says that holes flow against the arrow, while electrons flow in the direction of the arrow. Who is correct?
A only
Which of the following is the LEAST-Likely cause of a compression leak?
A timed spark
The term MOST-Likely used to describe the event that occurs when hydraulic fluid mixed with air is:
Aeration
Which of the following statements is LEAST-Likely true?
An active suspension requires conventional shock absorbers or springs
All of the following statements are true EXCEPT:
An alternative to a standard vernier caliper is the main vernier
All of the following statements are true EXCEPT:
An interior temperature sensor is usually mounted in the defroster
All of the following statements are true EXCEPT:
An interlock mechanism holds the transmission in gear (provided there are no worn parts in the synchronized shift collar)
All of the following statements are true EXCEPT:
As a general rule, exhaust back pressure should not exceed 3.75 psi at wide-open throttle (WOT) under fuel load
The term MOST-Likely used to describe a drive axle is:
Axle shaft
The condition that MOST-Likely results from excessive brake heat is:
Brake fade
The friction materials used in cars and trucks are called ____
Brake linings
Which of the following statements is LEAST-Likely true?
Cable chains are just as effective as conventional chains, but are apt to cause damage due to incorrect installation
All of the following statements are true EXCEPT:
Cast rocker arms that are shaft mounted cannot he reground
The part the is MOST-Likely located in front of the muffler in the exhaust system and looks like a heavy muffler is:
Catalytic converter
A ____ Fire is one in which there are flammable liquids such as grease, oil, gasoline, or paint
Class B
The ____ is the most common type of spring used in the front and read of passenger cars
Coil spring
All of the following statements are true EXCEPT:
Commonly used metric drills range from 0.20 mm to 21.00 mm in size
The to that would MOST-Likely be used to measure cylinder bores is the:
Comparator gauge
A(n) ____ combines two planetary headsets to provide more gear ratio possibilities
Compound planetary gearset
Accessories are MOST-Likely driven with a belt from the:
Crankshaft
A wrench head that has been adapted so that it can be used with a ratchet and extension is MOST-Likely referred to as a(n):
Crowfoot socket
The term MOST-Likely used to describe the weight of the vehicle without passengers or luggage but includes a full tank of fuel all fluids filled in the vehicle is
Curb weight
Which of the following statements is LEAST-Likely a component of a typical internal shift mechanism?
Cylinder
The part that wilL MOST-Likely warp, especially when a head gasket has failed due to engine overheating is the:
Cylinder head
When removing a nut from a long stud, the MOST-Likely tool used to provide clearance is the:
Deep socket
When injectors get dirty, this can cause ____ at full throttle
Detonation
____ are used to make external threads on a round rod
Dies
A ____ is a one-way electrical check valve
Diode
All of the following statements are true EXCEPT:
Disc brake systems always have a check valve
The statement that is MOST-Likely true is:
R-134A requires less weight of refrigerant during a refill because R-134A is a different density
Which of the following is LEAST-Likely true?
RTV silicone is normally used around fuel
A(n) ____ is sometimes used for loosening or tightening special applications such as muffler clamps or tie-rod end clamps on the steering linkage
Ratcheting box wrench
All of the following statements are true EXCEPT:
Removal of 0.020" from OHC head surfaces results in about 10 degrees of retard in valve timing
Three-way catalytic converters use ____ as a catalyst for their reduction portion (the part that controls NOx)
Rhodium
All of the following statements are true EXCEPT:
Rubber freezes at only 50°F and becomes sticky at 86°F
The MOST-Likely indicator of a slow rise in temperature or a fast rise due to a stuck-closed thermostat is the:
Sending unit
All of the following represent information identified by the VIN EXCEPT:
Serial number
Which of the following statements is LEAST-Likely true?
Service records are usually found in the engine
The term ____ refers to the amount of space it takes for a vehicle to be able to turn around
Steering ratio
The term MOST-Likely used to refer to temperatures that are above a liquid's boiling point is:
Superheat
