WorksheetsYear 3 Chassis
Total questions: 30
Worksheet time: 15mins
The purpose of single check valves in an air system is to?
for air to flow to the reservoir in 1 direction not back out
Allow air to flow to the brake chambers in one direction
Allow air to flow in both directions and from the reservoir
Allow air to flow to the air dryer in one direction
When piping an air control valve what would the identification code 21/22 refer to?
Exhaust port 1, Exhaust port 2
Delivery port 1, delivery port 2
Supply port 1, supply port 2
Signal port 1, signal port 2
The most commonly used type of wheel sensor in an ABS system is
Productive
Inverted
Inductive
Selective
An ABS warning light indicates a system failure, what would be the first thing you do?
Remove all wheels + hubs to check the exciter rings
Remove and replace all sensor wiring looms
Check the voltage output from each sensor
Check that the sensor exciter disc air gap is correctly set
In an ASR system which of the following is true?
The system works in conjunction with the ABS
All of the answers
Uses a wheel sensor to detect spin
Limits engine torque to avoid excessive spin
A blocked exhaust port on a quick release valve may result in?
The compounding of service and auxiliary air systems
Inefficient braking
Delayed braking
The slow release of the brakes
When piping an air control valve what would the identification code 41/42 refer to?
Delivery port 1, delivery port
Supply port 1, supply port 2
Signal port 1, signal port 2
Exhaust port 1, Exhaust port 2
On a inspection you find a spring brake chamber is not fully releasing the most probable cause?
Air leak past diaphragm
Weakened brake chamber actuating main spring
Unloader valve pressure set incorrectly
Low foot valve delivery pressure
An ABS inductive sensor produces an?
A combination of both
PWM wave form signal
DC wave form signal
AC wave form signal
In an ABS system what effect would an open circuit reading on a wheel sensor have on braking?
The effected wheel would have decreased braking efficiency
The effected wheel would have increased braking efficiency
The effected wheel could lock up
The effected wheel would have no braking efficiency
On heavy vehicles its common for the ABS sensors to supply information to which other system?
EDC
ECAS
ASR
ECAM
What in an air brake system controls the operation of the ABS air pressure at the wheel?
ABS modulator valve
ABS exciter ring
ABS wheel sensor
ABS load sensor
ABS: what effect would an exciter ring tooth missing or out of alignment have on the system?
Can cause low air pressure to effected wheel
Can cause wheel lock up
Can cause unwanted ABS activation
Can cause modulator valve failure
A bus fitted with disc brakes has brake drag after releasing the brakes, what is the cause?
Excessive hub bearing end-float
Excessive clearance between brake calliper and disc pad
Service air line pressure set to high
A blocked exhaust port in the quick release valve
What in an air brake system controls the operation of the ABS air pressure at the wheel?
ABS modulator valve
ABS exciter ring
ABS load sensor
ABS wheel sensor
What equipment can be used to check defective ABS sensor in situation?
connect an oscilloscope across the sensor and turn wheel
connect ohm meter and turn wheel
ABS sensor cannot be tested in situation
connect volt meter and turn wheel
What must you carry out after working on an electronic controlled ride height sensor?
air bag pressure
max chassis raised ride height
min chassis lowered ride height
chassis ride height calibration
which one of these is not a geometry angle?
Slip angle
Castor
Camber
KPI
When checks should you make to confirm suspension damper for serviceability?
Check for visible signs of leaks
Check for component security
Check condition of mounting bushes
All of the answers shown
What controls an air suspension system ride height?
Self levelling system
Load imposed on the vehicle
Drivers hand control system
Vehicle air Pressure
When removing a vehicle battery which battery terminal should be removed first
Select one:
Either terminal
The live terminal
The earth terminal
It doesn't make any difference
What is the most effective way of dealing with a substantial oil spill in the workshop?
Select one:
Cover the oil with sand, sweep it away and wash the floor with petrol
Use wood shavings on the oil and burn away from the workshop
Cordon off the area, make staff aware and use absorbent granules on the oil
Clean the area with petrol and burn off the excess
Turbocharged engines use an intercooler to:
increase fuel density
decrease air density
reduce fuel density
increase air density
Pre-injection is used to:
Select one:
decrease valve wear
decrease engine vibration
decrease engine diesel knock
increase engine vibration
Why do you bleed the fuel system after changing the filter?
.
To increase the fuel pressure
To remove water from the system
To remove air from the system
To remove contamination from the system
Excessive clearance in a valve operating mechanism will:
retard the ignition point
increase valve overlap
retard the valve timing
advance the valve timing
How many cells in a 12 volt Lead Acid battery
Select one:
4
6
10
3
Battery state of charge should be checked with:
Select one:
a hydrometer
a calorimeter
an ohmmeter
an ammeter
Housekeeping resources should be used?
Select one:
Haphazardly
Irregularly
Sparingly
Liberally
What is the role of the traffic commissioner?
Select one:
Responsible for the licensing and regulation of those who operate heavy goods vehicles, buses and coaches
Responsible for the MOT and vehicle testing of light and heavy goods vehicles
Responsible for the maintenance of roads and highways
Responsible for all road traffic regulations including traffic lights and road furniture
