Driveline Midterm
If a drive gear has 20 teeth and its driven gear has 40 teeth, what is the mechanical advantage of the gear set?
2:!
A gear set in which the input gear has half as many teeth as the output gear has a ratio of ______.
2:1
Ratios are normally expressed as the equivalent of the first number to 1; thus, 8 to 2 would be expressed as ______.
4:1
A vehicle's axles can be flexible half-shafts, which use constant velocity (CV) joints, as the case with _______.
AWD and FWD
Which of the following can cause an electronically controlled transmission to operate incorrectly?
Air leak after mass air flow sensor or exhaust system restrictions
Which of the following hybrid electric systems uses a belt-driven alternator that also doubles as a starter?
Belt Alternator Starter (BAS)
Tech A says that a transaxle must have a type of differential assembly to allow the front wheels to turn at different speeds while driving around a curve. Tech B says that conventional RWD vehicles will typically use a differential assembly that is located in the rear axle assembly
Both
Tech A says that hybrid vehicles have an internal combustion engine and an electric motor. Tech B says that most hybrid vehicles utilize regenerative braking to help improve fuel economy.
Both
Two techs are discussing torque converters. Tech A says that a torque converter does a similar job as the manual clutch. Tech B says that the torque converter multiplies torque from the engine to the input shaft of the transmission.
Both
Which of the following can be caused by excessive transmission fluid temperature?
Cavitation bubbles, Oxidation, Reduced lubrication (All of the above)
The clutch is designed to:
Connect and disconnect the trans from the engine
Which of the following is the goal of in-vehicle diagnosis?
Diag. whether the fault is in or outside the trans. Diag. the faulty components before removing the trans and tearing them down
All gear ratios are calculated by the formula ______.
Driven/Drive
Data from the input shaft speed sensor and output shaft speed sensor are compared by the TCM or PCM to determine all of the following, EXCEPT;
Engine misfires
Performing a check of the fluid level in an auto trans is the final step in diagnosing a trans problem.
False
Which of the following is most likely to be used with an automatic transmission?
Flexplate
Which of the following is used to connect the engine crankshaft to the torque converter?
Flexplate
Which of the following was used to connect the engine crankshaft to the input shaft of early automatic transmissions?
Fluid coupling
What can be calculated by the PCM by comparing the input shaft speed sensor and output shaft speed sensor?
Gear ratio and clutch or band slippage
Which of the following can be caused by low transmission fluid temperature?
High viscosity, Friction losses, Reduced lubrication (All of the above)
Which of the following features qualifies a vehicle as a "mild hybrid"?
Idle stop
Which of the following is a function of a hybrid vehicle?
Idle stop and regenerative braking
The purpose of the final drive assembly is to _______.
Increase torque from the trans
Which of the following hybrid systems cannot drive using the electric motor only?
Integrated Motor Assist (IMA) and Belt Alternator Starter (BAS)
What is achieved when the transmission fluid first runs through the external cooler and then through the cooler in the radiator?
It prevents overcooling of the transfluid
How is the high voltage battery recharged?
Kinetic energy of the moving vehicle driven the electric motor or generator Internal combustion engine driven electric motor/generator
Which of the following seal designs are commonly used to keep oil inside the transmission while keeping water and dirt out?
Lip seals
In ____ gear, where the smallest gear in the trans turns the largest gear in the trans, one complete turn of the small gear turns the larger gear only a small portion of a full turn.
Low
Tech A says that helical cut gears are stronger than straight cut gears. Tech B says that helical cut gears are noisier than straight cut gears.
Neither
Which of the following can cause undesirable trans operation and damage to the auto trans?
Partial application of the wrong hydraulic circuit
Referring to transfer cases, which of the following statements is NOT true?
Power is always directed to both front and rear axles
Which of the following additives are designed to help protect the seals inside a transmission and cause the seals to swell slightly to help prevent leaks and clutch slippage?
Seal conditioners
If a half-shaft type axle is clicking while turning ____, then the joint or entire half-shaft will need to be replaced.
Sharply
Inside a torque converter, the one-way clutch allows the stator to rotate only in one direction. Tech A says that it will turn in the same direction of the output shaft. Tech B says it turns in the same direction as the impeller.
Tech A
Tech A says that spur gears are stronger than helical gears and are often used in heavy-duty vehicles. Tech B says spur gears run more quietly than helical gears.
Tech A
Tech A says that the angle of the rear axle assembly companion flange should be perpendicular to the trans output shaft. Tech B says that U-Joints should be 45 degrees out of phase from one another to minimize vibration.
Tech A
Tech A says that the differential assembly provides a means for the inside and outside wheels to turn at different speeds when going around a corner. Tech B says that the differential assembly provides smooth shifts and reduces gear "grinding" by matching gear speeds.
Tech A
Tech A says that all hybrid vehicles use the same trans ass a non-hybrid vehicle. Tech B says that some hybrid trans have a small electric fluid pump for when the trans is in idle/stop mode.
Tech B
Tech A says that gear ratios are all the same in any 5-speed trans. Tech B says that gear ratios vary from trans to trans.
Tech B
Tech A says that the final drive assembly always has a gear ratio of 1:1. Tech B says the final drive assembly provides further gear reduction between the trans and the drive wheels.
Tech B
Tech A says that the final drive is used to provide an increase in rotational speed of the axles. Tech B says that the final drive is used to provide an increase of twisting force to the axles.
Tech B
When the engine accelerates, higher impeller speed discharges the fluid across and against the turbine vanes. What happens when the oil strikes the turbine vanes?
The turbine begins to spin and torque is transferred to the input shaft
Why are helical gears most often used for light-duty passenger vehicles?
They operate quietly
Which of the following hybrid functions allows manufacturers to reduce engine size while retaining performance similar to a large engine?
Torque assist
Which of the following is not an in-vehicle transmission repair?
Torque converter clutch replacement
Which components are added to the drive train of a 4WD vehicle compared to a 2WD vehicle?
Transfer case, Second final drive assembly, second driveshaft (All of the above)
Limp-in mode means that even if the computer for the transmission or the part of the PCM that controls the transmission fails, the vehicle will still be derivable.
True
To properly diag. a problem with an auto trans, you need to do a thorough inspection of the trans and perform several diagnostic tests.
True
Torque multiplication within a torque converter is automatically adjusted, within design limits, by the difference in speed between the impeller and the turbine.
True
Which of the following can be used in a hybrid vehicle to generate electricity to charge the high-voltage battery?
Vehicle's kinetic energy during braking
