Heavy Duty Technician Level 1 – SLE Review Study Guide (2026 Exam
Preparation)
A diamond in a frame can be determined by the use of the projection method and - ANS ✔✔A
tape measure
A magnetic field is created when a voltage is applied to a coil of wire. What happens when the
applied voltage is suddenly removed.``` - ANS ✔✔The magnetic field collapses creating an
induced voltage in the opposite direction of applied voltage
A pictogram of a green triangle on a fire extinguisher would represent what class of fire? - ANS
✔✔Class A fires: ordinary combustibles
A primary winding is wrapped around a secondary winding but they are not electrically
connected. The applied voltage is suddenly removed from the primary winding. What happens
to the secondary winding? - ANS ✔✔mutual induction occurs when the collapsing primary field
induces voltage in the secondary coil
A substance that can dissolve metals and burn flesh is classified as: - ANS ✔✔Corrosive
A truck driver complains that air is being discharged from somewhere in the supply circuit at a
frequency of every minute or so: there is no evidence of continuous air leakage on the truck.
Which of the following should be checked out first? - ANS ✔✔Leakage in the unloader circuit
Adjusting the length of the tie rod sets the: - ANS ✔✔Toe-in
Air brake drum and brake lining wear can be checked by checking S-cam rotation from the low
section of the cam rising to full brake lining to drum contact. What is the maximum S-cam
rotation allowed for this brake check under B.C. CVIP guidelines? - ANS ✔✔120 degrees
,Air constantly leaks from the exhaust port of a tractor relay valve when the park brakes are
released. What should be done? - ANS ✔✔Check the related spring brake chambers for hold-off
pressure back-flow
All of the weight NOT supported by a vehicle suspension is known as: - ANS ✔✔Unsprung
weight
An "exclusion" type of seal is used primarily to: - ANS ✔✔Prevent entry of dirt etc. that would
damage the moving parts
An air brake equipped highway tractor features single dash air pressure gauge with two needles,
one green and the other red. What does the red needle display? - ANS ✔✔Secondary circuit
pressure
An air compressor fails to build to system pressure within an acceptable time period. Which of
the following could be a possible cause of the problem? - ANS ✔✔Restriction from carbon build
up in compressor discharge port
An air leak is noticed on the exhaust port of a relay valve. There is no air pressure applied to the
pilot line of the valve. Is there a problem with the valve, if so what is the problem? - ANS ✔✔Air
is leaking past the inlet seat
Approximately how much voltage can be obtained from a single cell in a lead acid battery? - ANS
✔✔2 volts
At what point should a tire be deflated when it is going to be replaced? - ANS ✔✔Before
removing it from the truck hub
Axial loads are loads that occur: - ANS ✔✔parallel to the shaft
, Because a fixed displacement pump is installed in the forklift circuit, the main control valve
should be the __________ centre type. - ANS ✔✔Open
Before disconnecting any part of a hydraulic system, which of the following procedures should
be performed first? - ANS ✔✔Shut down the engine & cycle the control levers to relieve
pressure
Before removing a hydro-air suspension cylinder from a vehicle, you should - ANS ✔✔Bleed the
nitrogen from the system
Camber is: - ANS ✔✔the inward or outward tilt at the top of the wheel in relation to true
vertical
Circuits are tested for which of the following problems? - ANS ✔✔Opens, shorts and grounds
Disc brake calipers are made in two different designs: - ANS ✔✔Fixed or floating
Friction is: - ANS ✔✔Resistance to movement between two objects in contact
Having free travel of a hydraulic brake pedal is necessary to prevent the blocking of the: - ANS
✔✔Compensating port
How can a long stroke brake chamber be identified? - ANS ✔✔Square inlet ports
How can a spring park brake be released when there is no air in the brake system? - ANS
✔✔Use a brake chamber caging bolt
How does a diode affect the flow of electric current? - ANS ✔✔It allows current to flow in one
direction only
Preparation)
A diamond in a frame can be determined by the use of the projection method and - ANS ✔✔A
tape measure
A magnetic field is created when a voltage is applied to a coil of wire. What happens when the
applied voltage is suddenly removed.``` - ANS ✔✔The magnetic field collapses creating an
induced voltage in the opposite direction of applied voltage
A pictogram of a green triangle on a fire extinguisher would represent what class of fire? - ANS
✔✔Class A fires: ordinary combustibles
A primary winding is wrapped around a secondary winding but they are not electrically
connected. The applied voltage is suddenly removed from the primary winding. What happens
to the secondary winding? - ANS ✔✔mutual induction occurs when the collapsing primary field
induces voltage in the secondary coil
A substance that can dissolve metals and burn flesh is classified as: - ANS ✔✔Corrosive
A truck driver complains that air is being discharged from somewhere in the supply circuit at a
frequency of every minute or so: there is no evidence of continuous air leakage on the truck.
Which of the following should be checked out first? - ANS ✔✔Leakage in the unloader circuit
Adjusting the length of the tie rod sets the: - ANS ✔✔Toe-in
Air brake drum and brake lining wear can be checked by checking S-cam rotation from the low
section of the cam rising to full brake lining to drum contact. What is the maximum S-cam
rotation allowed for this brake check under B.C. CVIP guidelines? - ANS ✔✔120 degrees
,Air constantly leaks from the exhaust port of a tractor relay valve when the park brakes are
released. What should be done? - ANS ✔✔Check the related spring brake chambers for hold-off
pressure back-flow
All of the weight NOT supported by a vehicle suspension is known as: - ANS ✔✔Unsprung
weight
An "exclusion" type of seal is used primarily to: - ANS ✔✔Prevent entry of dirt etc. that would
damage the moving parts
An air brake equipped highway tractor features single dash air pressure gauge with two needles,
one green and the other red. What does the red needle display? - ANS ✔✔Secondary circuit
pressure
An air compressor fails to build to system pressure within an acceptable time period. Which of
the following could be a possible cause of the problem? - ANS ✔✔Restriction from carbon build
up in compressor discharge port
An air leak is noticed on the exhaust port of a relay valve. There is no air pressure applied to the
pilot line of the valve. Is there a problem with the valve, if so what is the problem? - ANS ✔✔Air
is leaking past the inlet seat
Approximately how much voltage can be obtained from a single cell in a lead acid battery? - ANS
✔✔2 volts
At what point should a tire be deflated when it is going to be replaced? - ANS ✔✔Before
removing it from the truck hub
Axial loads are loads that occur: - ANS ✔✔parallel to the shaft
, Because a fixed displacement pump is installed in the forklift circuit, the main control valve
should be the __________ centre type. - ANS ✔✔Open
Before disconnecting any part of a hydraulic system, which of the following procedures should
be performed first? - ANS ✔✔Shut down the engine & cycle the control levers to relieve
pressure
Before removing a hydro-air suspension cylinder from a vehicle, you should - ANS ✔✔Bleed the
nitrogen from the system
Camber is: - ANS ✔✔the inward or outward tilt at the top of the wheel in relation to true
vertical
Circuits are tested for which of the following problems? - ANS ✔✔Opens, shorts and grounds
Disc brake calipers are made in two different designs: - ANS ✔✔Fixed or floating
Friction is: - ANS ✔✔Resistance to movement between two objects in contact
Having free travel of a hydraulic brake pedal is necessary to prevent the blocking of the: - ANS
✔✔Compensating port
How can a long stroke brake chamber be identified? - ANS ✔✔Square inlet ports
How can a spring park brake be released when there is no air in the brake system? - ANS
✔✔Use a brake chamber caging bolt
How does a diode affect the flow of electric current? - ANS ✔✔It allows current to flow in one
direction only
