Steering
which of the following components contains ball joints?
a. the steering gear
b. the pitman arm
c. the steering knuckle
d. the tie-rod end
d. the tie-rod end
which of the following air brake system components function as a lever?
a. the brake chamber
b. the rotor
c. the caliper
d. the slack adjuster
d. the slack adjuster
in hydraulic drum brake, the shoes are mechanically forced against the drum by..
a. a master cylinder
b. the wheel cylinder
c. braked anchors
d. return springs
b.the wheel cylinders
the most compressed condition of a springis known as:
a. rebound
b. jounce
c. oscillation
d. failed
b. jounce
which of the following is a measure of electrical pressure?
a. amperes
b. ohms
c. voltage
d. watts
c. voltage
what is used to provide steering power assist in most heavy-duty highway truck systems?
a. compressed air
b. hydraulic pump
c. electric pump
d. drag link
b. hydraulic pump
the function of the air brake chamber is to
a. convert the energy of the compressed air into mechanical force
b. multiply the mechanical force applied to the slack adjuster
c. reduce the air pressure to a service application
d. increase the air pressure for parking brakes
a. convert the energy of compressed air into mechanical force
which of the following statement best describes how ABS prevents brake lockup?
a. ABS senses abnormal braking forces and corrects them
b. ABS monitors wheel speed and reduces service pressure when lockup is imminent
c. ABS decreases service application pressure for all braking
d. ABS adjusts braking force on every wheel, even in light braking situations
b. ABS monitors wheel speed and reduces service pressure when lockup is imminent
what type of truck suspension is most commonly found on highway trucks today?
a. air spring
b. solid rubber spring
c. steel coil spring
d. steel leaf spring
a. air spring
a break in a circuit that causes a loss of continuity is called a :
a. short
b. ground
c. open
d. over load
c. open
what type of hydraulic pump is used on most highway truck power-assist steering gear systems?
a. gear
b. vane
c. plunger
d. contrifugal
b. vane
which of the following is an advantage of an open anchor brake shoe?
a. a. servo action
b. the anchor pins never have to be changed
c. faster brake jobs
d. the retraction springs last longer
c. faster brake jobs
a set of brake linings has become glazed because of oil saturation by a failed wheel seal. technician A says that pressure washing the foundation brake components should be sufficient to remove the effects of the oil saturation. Technician B says that the best practice is to replace the brake linings on both wheels on the affected axle. who is correct
a. Tech A
b. Tech B
c. both A and C
d. neither
b. Tech B
what device is used primarily to absorb and dampen suspension oscillation?
a. equalizer bracket
b. torque rod
c. springs
d. shock absorber
d. shock absorber
according to ohms law, what should happen to current flow if circuit resistance increases and voltage remains the same?
a. ceases
b. increases
c. decreases
d. a capacitor
c. decreases
when adjusting drag link length before installing it, which of the following should be true?
a. the steering gear should be centered
b. the front wheel should be in a true straight-ahead direction
c. the steering wheels should be a full lock on one side
d. both a and b
d. both a and b
what is the usual color of the tractor to trailer service hose?
a. green
b. blue
c. red
d. white
b. blue
which of the following best describes the electrical operation of a typical ABS wheel speed sensor?
a. hall effect sensor
b. thermistor
c. potentiometer
d pulse generator
d pulse generator
what type of spring is usually mounted on top of the truck rear spring assemblies and is used only when a truck is under heavy load?
a. progressive spring
b. constant spring
c. auxiliary spring
d. air spring
c. auxiliary spring
Which of the following is the correct means of electronically coupling a reader/programmer EST with a truck chassis ECM.
a. modem
b. chassis data connector
c. any Deutseh connector
d. parallel link connector
b. chassis data connector
when diagnosing a steering system using a power steering analyzer, which of the following should be true to obtain accurate results?
a. the engine oil should be at operating temperature
b. the steering system hydraulic oil should be cold
c. new steering system hydraulic oil must be used
d. the steering system hydraulic oil should be above 140 degrees Fahrenheit
d. the steering system hydraulic oil should be above 140 degrees Fahrenheit
what is the adjustment stroke limit for a standard 30-series brake chamber?
a. 1.5 inches
b. 2 inches
c. 2.25 inches
d. 3 inches
b. 2 inches
at how much free stroke travel should a properly adjusted, automatic s-cam brake slack adjuster test?
a. marginal pre-load
b. zero
c. 3/8 to 5/8 inch
d. 1 to 1 1/2 inch
c. 3/8 to 5/8 inch
when lubing a spring pack assembly, neither the fixed bracket spring pin not the shackle pin will take grease. what should you do first?
a. change the zerk fitting
b. remove the weight from the spring
c. replace the spring pins
d. replace the spring pack
b. remove the weight from the spring
Technician A says that a corroded light unit terminal could result in an increased voltage drop across the terminal. Technician B says that a corroded light unit terminal could result in heat at the terminal. Who is correct?
a. Tech A only
b. Tech B only
c. both A & B
d. neither a nor b
c. both A & B