IICL CHASSIS INSPECTOR COMPLETE EXAM 2024| ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS| SCORED 100%
What is traction control? - ANSWER Helps the ABS improve vehicle traction by minimizing wheel slip on the drive axle during acceleration.
What is ABS? - ANSWER Antilock braking systems are electronic systems that monitor and control wheel slip during vehicle braking.
What are the components of ABS? - ANSWER electronic control unit (ECU), wheel
speed sensors, modulator valves, exciter rings
In ABS, what is the function of the electronic control unit (ECU)? - ANSWER Processes all ABS info and signal functions. Receives and interprets voltage pulses generated by the sensor pickup as the exciter teeth pass by, and uses this info to determine: (a) impending wheel lock, and (b) when/how to activate the ABS modulator valves.
In ABS, what is the function of the modulator valves? - ANSWER Regulate air pressure to the brakes during ABS action. ECU commands mod valve to either change the air pressure to the brake chamber, or hold the existing pressure.
In ABS, what are the 2 main components of the wheel speed sensors ? - ANSWER (1) exciter, and (2) pickup
In ABS, what is an exciter? - ANSWER A ring with notched teeth, also known as sensor ring, tooth wheel, tone ring, and exciter.
In ABS, what is an pickup? - ANSWER Commonly called "the sensor" which contains a wire coil/magnet assembly, which generates pulses of electricity as teeth of the exciter pass in front of it.
Which pin/wire is the power supply for ground on a 7-way plug? - ANSWER Pin 1 -
white
Which pin/wire is the power supply for stop and antilock on a 7-way plug? - ANSWER Pin 2 - red
Which pin/wire is the power supply for power for electronic control unit (ECU) on a 7-
way plug? - ANSWER Pin 3 - blue
Which pin/wire is the power supply for identification, front and intermediate markers, front clearance, rear markers, license, tail and rear clearance on a 7-way plug? - ANSWER Pin 4 - brown Which pin/wire is the power supply for right directional on a 7-way plug? - ANSWER
Pin 5 - green
Which pin/wire is the power supply for left directional on a 7-way plug? - ANSWER Pin 6 - yellow
Which pin/wire is the power supply for ABS warning light on a 7-way plug ? - ANSWER Pin 7 - green/white
What is the transition area? - ANSWER Location where the gooseneck meets the main rails
What is a "horn" on a chassis? - ANSWER Large gathering structure extending above the top flange of the front of the chassis. It is a gathering device used to guide
containers lifted on/off chassis, and to restrict forward movement.
What is a kingpin? - ANSWER Critical structural member and connecting link between the chassis and the tractor fifth wheel.
What is the inspection criteria for kingpin? - ANSWER Excessive wear beyond acceptable limits; chipped, broken, or cracked collar; looseness in upper coupler construction
What is the required diameter of a kingpin? - ANSWER Upper section: between 2-
11/16" & 2-7/8"
Lower section: between 1-7/8" & 2"
What is the inspection criteria for the upper coupler plate? - ANSWER Examine for gouges from fifth wheel, lubricated with grease, excessive/uneven wear, dishing, bulging, or distortion upwards. Check for corrosion and/or blockage of drain holes.
What is the inspection criteria for the main rails? - ANSWER Sight along main rails to notice deformation (twist, bow, dent, or bend) in framework; examine frame welds for cracks
What is the deciding factor in repairing main rails? - ANSWER Rails must be repaired when deformation influences the ability of a container to be seated properly and secured to the chassis, or its ability to track properly.
What is the inspection criteria for the landing legs? - ANSWER Inspect support mounting brackets for bending and tight bolts; bolt holes on brackets and legs are same size; missing/damaged bolts replaced; uneven height; out of alignment (out of plumb condition in all directions)
What are the components of the landing gear? - ANSWER Landing leg brace (diagonal or cross brace), landing legs, gear box, cross shaft, crank handle, crank handle retainer, sand shoes (or wheels), sand shoe axle
What is traction control? - ANSWER Helps the ABS improve vehicle traction by minimizing wheel slip on the drive axle during acceleration.
What is ABS? - ANSWER Antilock braking systems are electronic systems that monitor and control wheel slip during vehicle braking.
What are the components of ABS? - ANSWER electronic control unit (ECU), wheel
speed sensors, modulator valves, exciter rings
In ABS, what is the function of the electronic control unit (ECU)? - ANSWER Processes all ABS info and signal functions. Receives and interprets voltage pulses generated by the sensor pickup as the exciter teeth pass by, and uses this info to determine: (a) impending wheel lock, and (b) when/how to activate the ABS modulator valves.
In ABS, what is the function of the modulator valves? - ANSWER Regulate air pressure to the brakes during ABS action. ECU commands mod valve to either change the air pressure to the brake chamber, or hold the existing pressure.
In ABS, what are the 2 main components of the wheel speed sensors ? - ANSWER (1) exciter, and (2) pickup
In ABS, what is an exciter? - ANSWER A ring with notched teeth, also known as sensor ring, tooth wheel, tone ring, and exciter.
In ABS, what is an pickup? - ANSWER Commonly called "the sensor" which contains a wire coil/magnet assembly, which generates pulses of electricity as teeth of the exciter pass in front of it.
Which pin/wire is the power supply for ground on a 7-way plug? - ANSWER Pin 1 -
white
Which pin/wire is the power supply for stop and antilock on a 7-way plug? - ANSWER Pin 2 - red
Which pin/wire is the power supply for power for electronic control unit (ECU) on a 7-
way plug? - ANSWER Pin 3 - blue
Which pin/wire is the power supply for identification, front and intermediate markers, front clearance, rear markers, license, tail and rear clearance on a 7-way plug? - ANSWER Pin 4 - brown Which pin/wire is the power supply for right directional on a 7-way plug? - ANSWER
Pin 5 - green
Which pin/wire is the power supply for left directional on a 7-way plug? - ANSWER Pin 6 - yellow
Which pin/wire is the power supply for ABS warning light on a 7-way plug ? - ANSWER Pin 7 - green/white
What is the transition area? - ANSWER Location where the gooseneck meets the main rails
What is a "horn" on a chassis? - ANSWER Large gathering structure extending above the top flange of the front of the chassis. It is a gathering device used to guide
containers lifted on/off chassis, and to restrict forward movement.
What is a kingpin? - ANSWER Critical structural member and connecting link between the chassis and the tractor fifth wheel.
What is the inspection criteria for kingpin? - ANSWER Excessive wear beyond acceptable limits; chipped, broken, or cracked collar; looseness in upper coupler construction
What is the required diameter of a kingpin? - ANSWER Upper section: between 2-
11/16" & 2-7/8"
Lower section: between 1-7/8" & 2"
What is the inspection criteria for the upper coupler plate? - ANSWER Examine for gouges from fifth wheel, lubricated with grease, excessive/uneven wear, dishing, bulging, or distortion upwards. Check for corrosion and/or blockage of drain holes.
What is the inspection criteria for the main rails? - ANSWER Sight along main rails to notice deformation (twist, bow, dent, or bend) in framework; examine frame welds for cracks
What is the deciding factor in repairing main rails? - ANSWER Rails must be repaired when deformation influences the ability of a container to be seated properly and secured to the chassis, or its ability to track properly.
What is the inspection criteria for the landing legs? - ANSWER Inspect support mounting brackets for bending and tight bolts; bolt holes on brackets and legs are same size; missing/damaged bolts replaced; uneven height; out of alignment (out of plumb condition in all directions)
What are the components of the landing gear? - ANSWER Landing leg brace (diagonal or cross brace), landing legs, gear box, cross shaft, crank handle, crank handle retainer, sand shoes (or wheels), sand shoe axle
