Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

RGC A/O > Jacob Brake/ Telma Retarder > Flashcards

Jacob Brake/ Telma Retarder Flashcards

1
Q

What year trucks have the Jake Engine Brake?

A 
1995
2001
2002
2003
2006
2009
2016
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How does the Jake Brake work?

A

Is accomplished by prematurely opening the exhaust valves near the top of the compression stroke releasing the compression pressure to exhaust

Results: engine retarding effort to the drive wheels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What components does the Jake Brake consist of?

A
  • 3 position selector switch
  • On/ Off Switch (activates or deactivates the system)
  • Throttle sensor
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When do you use the Jake Brake?

A

Descending grades
City Traffic
Approaching stop lights
Whenever vehicle retarding required

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When do you NOT use the Jake Brake?

A

Wet Streets
During Aerial Operations
At Idle or Low Speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How quickly does the Jake Brake activate or deactivate?

A

Less than 1/4 of a second

Engine should be fairly warm
Switch located on the dashboard
Throttle pedal released, Jake will activate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How many positions does the Jake Brake have and when can they be changed?

A

3 Positions:
Low/ Moderate/ Maximum
2 cylinders/4 cylinders/ 6 cylinders

Can be changed at any time ( causes no damage)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the Time Limit of the Jake Brake?

A

None; the engine cooling system will continually absorb and dissipate the heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What year trucks have the Telma Retarder?

A

1995 & 1996

2000 & 2001

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is the Telma located and how does it work?

A

Rear of Truck

Current flows through stator coils, magnetic field is created and passes through the rotors which creates a eddy current and oppose rotor rotation and slows the driveline in the drive wheels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When do you use the Telma?

A

Descending grades
City Traffic
Whenever vehicle retarding is required

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do the Telma controls consist of?

A
  • ON/OFF switch
  • Pressure manifold unit
  • Low speed switch
  • Five position handle (located steering column)
  • Four lights- one for each stage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does the low speed switch on the Telma used for?

A

Deactivates retarder when vehicle is below 2-3 mph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the four stages of the Telma and what PSI and effect do they have?

A

3 PSI - 25%
5 PSI - 50%
7 PSI - 75%
10 PSI- 100%

Starts with slight pressure on the pedal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When does the Telam deactivates?

A

Deactivates at 2-3 mph
ABS system activated
At low speeds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How much electrical draw does the Telma withdraw?

A

Each stages draws 50 - 60 amps
Total of 250 if all used

*if voltmeter drops below standard, turn off and consult Shops

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Energy flows through coils called what?

A

Stator Coils

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What portion of the apparatus is retarded to slow effort in the drive wheels?

A

Driveline is retarded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The pressure manifold unit is connected to the _____?

A

Brake Pedal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

On a long downgrade, what position is advisable to maintain?

A

Position 2 ; obtains best endurance

21
Q

Diesel engines have a substantially larger or lesser retarding effect than gas engines?

A

Substantially Less

22
Q

The Jacob brake is a ___ engine attachment that, when energized, altars the engine exhaust valves operation, which converts the diesel engine into an air compressor.

A

Hydraulic

23
Q

This is accomplished by prematurely opening the ___ valves near the top of the compression stroke releasing the compression pressure to exhaust

A

Exhaust

24
Q

Uses the energy of the engines ___ stroke to provide vehicle retardation

A

Compression

25
Q

Provides maximum retarding power at ___ speed, therefore gear selection is important.

A

Rated

Maximum speed= rated speed

26
Q

Gas engines have a what in the carburetor, which creates a vacuum and subsequent engine braking.

A

Butterfly Valve

27
Q

Jacob brake continuous use times are?

A

Unlimited ( Cooling System)

28
Q

Does the diesel engine have to be fairly warm before engaging the Jake Brake?

A

Fairly warmed but the engine preheater water temperature is sufficient

29
Q

To turn on the Jake Brake, the switch is located where?

A

On the Dashboard

30
Q

When the throttle pedal is what, the Jake Brake will activate

A

Released

31
Q

Jacob Selector switch:

A 
Low= Medium
Medium= Moderate
High= Maximum
32
Q

During aerial operation, do not engage the jake brake during aerial operations. The practice causes undesirable retardation & what?

A

Engine Stalling

Possible engine damage

33
Q

Installation of the Telma Retarder requires that the drive shaft is cut, balanced and attached to rotors that rest near the retarder with a very what clearance?

A

Narrow

34
Q

The Telma Driveshaft is cut, balanced and is attached to what?

A

Two Rotors

35
Q

The Telma Retarder: As current flows through the what, a magnetic field is created which passes through the Telma rotors

A

Stator Coils

36
Q

The Telma Retarder: Electromagnets with alternate polarities are located in the ?

A

Stator Coils

37
Q

With slight pressure on the brake pedal, it brings the Telma retarder what into operation?

A

Progressively

38
Q

The Telma retarder draws large amounts of battery amperage, operators should pay greater attention to the apparatus what?

A

Charging System

39
Q

If the voltmeter drops below set standards, turn off the Telma toggle switch and what?

A

Consult the Shops

40
Q

It is advisable to combine the use of the Telma with that of the ___ to benefit from the braking effect of the engine.

A

Transmission

41
Q

The Telma Retarder is attached to?

A

The Rear Axle

42
Q

The Telma Retarder has a ___ position handle on the steering column?

A

5 position handle

43
Q

The Telma Retarder has how many stage activation lights?

A

4

44
Q

What is the Telma Model Driveline used on the 2000 and 2001 ALF?

A

Telma Model F2400 Driveline

45
Q

2000-2003: What does it mean if the Telma light activates in the Cab Instrumentation Light Assy?

A

Telma is ON

46
Q

The magnetic field creates what type of currents in the rotors? Which oppose rotor rotation and will slow the driveline

A

Eddy

47
Q

The drive shaft is cut, balanced and attached to ___ that rest near the retarder with a very narrow clearance.

A

Two Rotors

48
Q

Electromagnets with alternate polarities are located in the what?

A

The Stator

RGC A/O (45 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions