Jacobs Brake/Telma

Question 1

Electromagnets with alternate polarities are located in the ______.

Answer 1

Stator

(the stator is the stationary part of a rotary system attached to chassis between rotors and houses the bobbins. )

Question 2

The magnetic field creates eddy currents in the rotors, which oppose rotor rotation and slow the ____.

Answer 2

Driveline

Question 3

As current flows through the ____ coils, a magnetic field is created which passes through the _____.

Answer 3

Stator

Driveline

Question 4

If the ABS system detects any loss of traction during a brake application due to slippery road conditions, the Telma Retarder will __________.
.

Answer 4

Automatically deactivate

Question 5

The telma retarder controls consist of the following except:

 An ON/OFF switch to activate or deactivate the system.
 A pressure manifold unit connected to the brake pedal.
 A low speed switch which deactivates the retarder when the vehicle speed is below 2to 3 MPH.
 A group of Five lights, one for each stage activated.
A five position handle on steering column

Answer 5

*A group of 4 lights, one for each stage activated

Question 6

A slight pressure on the brake pedal brings the retarder progressively into operation, carrying it through the _____positions.

Answer 6

4

Question 7

4 Stages:

___PSI – 25% effect

___PSI – 50% effect

___PSI – 75% effect

___PSI – 100% effect

Answer 7

3 PSI – 25% effect
5 PSI – 50% effect
7 PSI – 75% effect
10 PSI – 100% effect

Question 8

The low speed switch deactivates the retarder when the vehicle speed is below ___to ___MPH

Answer 8

2 to 3

Question 9

Since the Telma Retarder operates by the use of electromagnets, there is an increased draw on the apparatus electrical system. Each stage of the Telma draws approximately ____to____amps

Answer 9

50-60

Question 10

When all four stages are activated, the Telma draws approximately amps

Answer 10

250

Question 11

This apparatus has been equipped with a high idle switch. This switch when activated, will raise the engine to ____RPM(2000 lti logbook)

*high idle vs fast idle

Answer 11

1000

Question 12

The Jacobs engine brake(Jake Brake) is a device, which uses the energy of the engine _______ to provide vehicle _______.

Answer 12

Compression

Retardation

Question 13

Jake brake control consists of the following:
X3

Answer 13

1. A three-position selector switch.
2. An on/off switch to activate or deactivate the system.
   A throttle sensor.

Question 14

Diesel engines have substantially less retarding effect upon vehicles than do gasoline engines. This is due to lack of ______in the diesel intake manifold

Answer 14

Restriction

Question 15

The Jake brake is a ____engine attachment that, when energized, altars the engine exhaust valves operation which converts the diesel engine into an _____

This is accomplished by prematurely opening the exhaust valves near the top of the ____ stroke

Answer 15

Hydraulic
Air compressor
Compression

Question 16

The engine brake reacts quickly; it will activate or deactivate in less than ____of a second

Answer 16

1/4

Question 17

The three-position selector switch allows the operator to choose the desired braking level:

Low – Activates _____cylinders for _____ engine retarding.
Medium – Activates _____ cylinders for _______engine retarding.
High – Activates _______cylinders for _____ engine retarding.

Answer 17

2 medium
4 moderate
6 maximum

Question 18

Do not engage the Jake Brake on _____. The additional braking effort on the drive wheels (duals) can cause them to lock up which could result in an uncontrollable skid.

Answer 18

Wet streets

Question 19

Telma; long downgrades;
After stabilizing the vehicle at desired speed it’s advisable to maintain position ___~~ . This obtains the best endurance.

Answer 19

2