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4th year HET > all moduel test questions > Flashcards

all moduel test questions Flashcards

1
Q

an auxiliary section that only has a range shift could have a gear ratio change from one shift to the next by how much %

A

30 to 40 %

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2
Q

an auxiliary section that only has a splitter shift could have a gear ratio change from one shit to the next by how much %

A

15 to 20 %

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3
Q

can a combination of range , splitter and deep reduction be used to provide the operator with many gear positions

A

yes

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4
Q

why must the main supply line be properly routed and secure

A

to prevent damage from forgine objects and prevent becoming a moisture trap

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5
Q

the air filter/regulator will generally regulate air to how much psi

A

58 to 63 psi

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6
Q

is the master air control valve specific to each transmission

A

yes they need to match the speed of the transmission they are used on

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7
Q

what is the pourpose of the slave valve

A

the slave valve allows the operator to pre select the range shift by inhibiting the shift until the main section is in neutral

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8
Q

while the main section is in gear what keeps the slave pistion from moving

A

the actuating pin

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9
Q

what is the range cylinder and how is it shifted

A

the range cylinder is a double acting cylinder that uses air to shift in both directions

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10
Q

the splitter/deep reduction air cylinder is shifted when

A

air from the filter/regulator is directed to, or exhausted from the back side of the piston

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11
Q

how are the plastic air lines used in multiple countershaft transmissions connected and where do they carry air

A

they are connected with furrule/insert type fittings and they carry air to the master control valve and the slave and/or the spool valve

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12
Q

why do the rubber coated cloth braid hoses carry a large volume of air

A

to quickly complete the range shift

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13
Q

why would a manufacturer develop a semi-automatic transmission where only the top two gears are automatically selected

A

the top two gears are the most used so having them shifted automatically reduces operator workload considerably

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14
Q

on the semi-automatic transmissions the electronically controlled shift system is controlled by the

A

engine electronic control unit

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15
Q

why is the semi-automatic transmission left in the high splitter position when it is shifted into the auto position

A

makes it easier for the operator when shifting out of the auto position back into 7th

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16
Q

what are some of the system components used in the electronic controlled shift systems

A

shift controller

visusual display pannel

trasnmission controller (ecu)

X - Y shifter ( main section electric shift assembly)

shaft speed sensors

range and/or splitter assembly

inertia brake

wiring harness

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17
Q

the transmission shift controller contains

A

operator shift console and dash display

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18
Q

the dash display is an that output divice that informs the operator of the state of the shifting process by the use of what

A

arrows

numbers

letters

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19
Q

what component is resonsible for all of the transmission shifting operations

A

transmission controller

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20
Q

when signalled by the transmission controller how will the rail motor move the shift finger

A

along the shift shaft to the desired shift rail through a slotted conecttion between the rail nut and shift finger

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21
Q

the range and splitter shifting is done through the

A

electronicall controled electric over air solenoids

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22
Q

what is the purpose of the inertia brake

A

increase the rate of deceleration of the countershafts

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23
Q

what mode must the operator select to have manual control over both upshifting and downshifting

A

hold

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24
Q

what mode would the operator use to get maximum engine braking

A

low

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25
Q

whenerver the vehicle is shut down what will the shift controller and the transmission controller do

A

they will not power down imediatly but go through a shutdown procedure placing the transmission in neutral

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26
Q

what prevents the vehicle from being started without first verifying the transmission is in neutral

A

the start enable relay used by the automated transmission

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27
Q

during normal operation in DRIVE the shift controller co-ordinates the shift by communicating with ?

A

the transmission controller and the engine ECU

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28
Q

if operating conditions of the transmission change what dose the automated transmission have the ability to do

A

learn and adapt the shift points as the vehicle load conditions change . the operator can help the electronic contol system learn to use new shift points during the shifting process

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29
Q

what are the three data links used in the automated transmission electronic system

A

proprietary data link

SAE standard j-1939

SAE standard j-1587

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30
Q

what are the three ways a diagnostic fault can be retrived

A

service warning light on the shift console

scan tools

PC based diagnostic equipment

31
Q

why should the transmission never be left in nuetral while thge truck is coasting

A

because the truck may gain to much speed and the electronic contol system may not be able to get the transmission back into gear

32
Q

what are the three functions of a transmission

A

to multiply torque from the engine

to reverse the direction of torque delivery

and to provide an interruption in torque while the clutch is still engauged

33
Q

what is the formula for calculating gear ratio

A

number of driven teeth divided by number of drive teeth

34
Q

can an engine that developes high torque over several hundred rpm be coupled with a transmission that has fewer gears

A

yes

35
Q

how should transmissions be matched to a vehicle

A

transmission gearing and torque handeling capacities should be matched to each vehicles normal operating conditions

36
Q

what are the two functions of the synchronizer assembly

A

to match or synchronize the speed of a mainshaft gear with the speed of the mainshaft during the shifting process

to temporarily connect a selected mainshaft gear to the mainshaft once the speeds of the maiting parts have been synchronized

37
Q

what are the three types of synchronizer assemblies used

A

block type

pin type

plate and disc

38
Q

multiple countershaft transmissions can only have two countershafts

A

no some transmissions can have up to three

39
Q

what are some advantages to multiple countershaft transmissions

A

smaller and lighter

floating design eliminates the need for bearings between the mainshaft and mainshaft gears

smaller gears can be used and cheaper spur cut gears can be used eliminating the need for thrust control washers

40
Q

when multiple countershaft design is used the main forward section often has how many gear selections

A

five

41
Q

multiple countershaft transmissions use several housings .these housings are kept in alignment through the use of

A

precise dowelling

42
Q

how are the input shaft and gear driven

A

by the clutch discs

43
Q

in a single coutershaft constant mesh desing the countershaft gears are

A

in constant mesh with the manshaft gears

44
Q

the mainshaft gears are located in place by

A

a set of double washers

45
Q

what is used to prevent transmission noise from being transmitted up into the cab

A

an isolator

46
Q

the shift lever directly moves the ____ in the shift bar housing

A

shift rail

47
Q

what is the function of the detent system

A

helps hold the shift rail in the neutral or selected gear position during operation

48
Q

what is the function of the interlock system

A

prevents transmission damage by preventing two gears from being selected at once

49
Q

what is the function of the spring loaded plunger

A

prevents the operator from selecting first or reverse when the vehilce is moving forward at a great speed

50
Q

in an overdireve transmission which of the forward gears be direct

A

fourth

51
Q

in most twin countershaft transmissions which gearing would the auxiliary section not provide

A

reverse

52
Q

where does the auxiliary drive gear recieve torque

A

from the mainshaft

53
Q

the auxiliary uses the synchronizer to aid in the ____ shift

A

range

54
Q

the purpose of the range, splitter and deep reduction cylinders is to

A

use the air signal to shift the auxiliary section sliding clutches

55
Q

what delivers toruqe to the driveline is supported on a tapered roller bearing and splined to the synchronizer sliding clutch

A

the output shaft

56
Q

the two speed auxiliary section provides

A

reduction and direct drive

57
Q

the three speed auxiliary section provides how many usable gears

A

12

58
Q

which position provides direct drive in a four speed auxiliary transmission section

A

high range high splitter

59
Q

what are the two methods of lubrication used on multiple countershaft transmissions

A

splash and pressure

60
Q

when a spin on filter is used on a transmission lubrication system the filter is located between the oil cooler and the

A

pump outlet port

61
Q

transmissions that utilize splash lubrication generally filter the oil by means of

A

magnetic plugs or magnet in the bottom of the case

62
Q

what is the best way to define a hybrid vehicle

A

any vehicle that has two means of propulsion

63
Q

what is the diffrence between a parallel hybrid and a series hybrid

A

a series hybrid the engine never directly propells the vehicle

a parallel vehicle an electric motor or hydraulic motor is sandwiched between the engine and the transmission assists with the propulsion

64
Q

what are the three key components of a deisel parallel electric hybrid

A

motor/generator

inverter

power electronics carrier (PEC)

65
Q

what are the two main functions of the motor/generator

A

to propel the vehicle

to charge the battery pack

66
Q

why are lithium batteries desireable for electronic hybrids

A

low discharge rates and high storage capacity

67
Q

during desiel electric propulsion mode what effect does the electric assist that the motor provides have on the desiel engine

A

lowers engine duty cycle

68
Q

what effect will coasting or braking have on lithium ion batteries

A

they will be charged

69
Q

in a deisel hybrid assembly which component recevies energy from the engine or the rear axle

A

the transfer case

70
Q

what are the two functions of the hydraulic pump/motor

A

during coast or regenerative braking it provides oil flow into the accumulators to presurize the sytem

during propel the flow of oil is reversed and it provides torque to the driveline

71
Q

during propulsion what is the function of the hydraulic motor accumulator and tranfercase

A

oil from the accumulators to the hydraulic pump making it act as a motor then transfreing oil to the transfercase which then applys torque to the driveline

72
Q

in a deisel electric hybrid what color are the high voltage cables

A

orange

73
Q

in a deisel hybrid motor what is the minimum amount of time to allow for the accumulator to bleed down

A

5 min

4th year HET (31 decks)

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