On an air brake system, the maximum allowable build up time for a single unit (tractor only) between 50 and 90 PSI is:
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Wrong!
The main function of a highway valve is to allow:
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Wrong!
An air leak from the exhaust port of a relay valve in the release position could be caused by a faulty:
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Wrong!
If the trailer emergency line is severed, the trailer brakes will dynamite through the actions of the:
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Wrong!
What is not included in the FMVSS 121 regulations?
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When air pressure in the tractor drops to 50 PSI, air flow through the tractor protection valve:
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The push rod should not extend past a point of _________ degrees between the push rod and slack adjuster.
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Wrong!
A loose mounting between the air governor and air compressor might cause:
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Wrong!
On a vehicle equipped with a relay type tractor protection valve, should the trailer service line become disconnected and the brakes are severely applied, what would happen if the tractor pressure dropped to 50 PSI?
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Wrong!
If the dash warning light on ABS air brakes fail to go out after the vehicle has been started, indicates a failure in the ABS system and the vehicle should not be driven.
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Wrong!
ABS air brakes used wheel sensor to monitor wheel speed:
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Wrong!
If an automatic slack adjuster fails to set up the brake to the required stroke:
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Wrong!
When a standard air brake system is equipped with a dash mounted control valve labelled "dry road, slippery road," in conjunction with a front wheel "limiting valve," this will allow:
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Wrong!
Which air source is used to release spring brakes on a dual air system?
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On a dual air system, a tractor protection valve uses which of the following?
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Wrong!
Why do you need a highway valve?
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If air pressure builds too high in an air system, what may be wrong?
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Wrong!
If air pressure is lost from the emergency line to a trailer with a relay-emergency valve the trailer would?
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Wrong!
What may cause the parking brakes to release slowly on a trailer?
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Wrong!
What is the purpose of the trailer dash valve?
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Wrong!
What would happen if the service line ruptured on a trailer?
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Wrong!
What is the correct angle of push rod to slack adjuster when the brakes are applied?
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When charging an air conditioning system with the vehicle running, adding liquid refrigerant may damage the:
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Wrong!
A high pressure condition can result from insufficient air flow across the condenser:
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Wrong!
When the air conditioning is shut off, the refrigerant will reach a balanced pressure in the complete system:
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Wrong!
When connecting gauges to a refrigeration system you would connect the low side gauge between the:
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The receiver drier is designed to absorb:
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What controls the pressure in an A/C evaporator?
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Wrong!
An automatic transmission will not drive in forward or reverse at an idle. the oil pressure is normal, what may be the problem?
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Wrong!
In a torque converter when the turbine is turning at almost the same speed as the impeller.
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Wrong!
When performing a stall test on an automatic transmission and torque converter, the engine RPM exceeds the manufacturer''s specifications by 200 RPM, what may be the problem?
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Wrong!
When performing a stall test on an automatic transmission and torque converter, the engine RPM is 200 RPM below manufacturer''s specifications, what may be the problem?
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Wrong!
When the face of a pot type pressure plate is resurfaced, what else need resurfacing
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As a clutch plate wears:
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A transmission is misaligned to the engine, which gear would be most likely to pop out?
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When shifting a ten speed transmission from low to high range, how do you shift it?
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If a clutch master cylinder push rod is too long:
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On a fuel injection pump system, what is the purpose of the restricted fitting in the return fuel line at the outlet of the fuel pump?
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If a transmission is noisy in all gears except direct, what might be the problem?
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On a hydraulic clutch system if the clutch linkage to the master cylinder is adjusted too long, what may be the result?
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Wrong!
Clutch brake adjustment, at the pedal, should be approximately
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Wrong!
If a clutch were adjusted so that the clearance between the release bearing and the clutch brake were to be reduced to 3/8 of an inch the clutch would:
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If a clutch brake is set properly and is in good working condition but the input shaft fails to stop properly when the clutch is released (pedal to the floor), what may be the problem?
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Wrong!
In the adjacent illustration, what most likely caused this failure?
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In the adjacent illustration, what most likely caused this failure?
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Wrong!
In a full time four wheel drive vehicle, or a tandem drive axle truck what is required in the transfer case/power divider?
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Wrong!
The property phase a drive line as illustrated you would:
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A vehicle with a lot of drive-line vibration would have:
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A high pitched whine in a differential while under acceleration could be caused by:
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Wrong!
In a planetary gear set with the sun held and the carrier driven, what do you have?
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If the sun is held and the carrier is the drive, you have:
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In a planetary gear set if the ring gear is held, the carrier is the drive and the sun is driven the result is:
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In the following illustration, if the clutch is engaged at A and released at B what gear is the gear set in?
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In the adjacent illustration, increasing this amount will move the pattern:
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If a differential assembly is noisy on turns only, one of the causes might be:
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To determine the pinion bearing preload:
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Pinion depth is increased or decreased by:
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An inter-axle differential in the normal running position will:
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Phasing of a drive shaft refers to:
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For good cancellation, working angles should be no more than ___________ degrees difference on a drive shaft.
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When checking an electronic speedometer pick-up, what should your meter be set to?
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Ohmmeter ratings on a good diode should read:
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How will the following illustrated system operate if the resistor at A breaks: (becomes open)?
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Which of the following symbols indicate an item that will protect an electrical circuit?
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What is the advantage of putting a relay in a headlight circuit?
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If resistance is doubled while the voltage remains the same:
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When checking the signal lights on a truck a technician finds that the left turn signal works fine but the right side does not flash, only the indicator light comes on and stays on. The most likely problem with the system might be:
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Wrong!
In the following illustration what is being tested?
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In the adjacent illustration, what is being tested?
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Reverse polarity of the coil primary winding will cause:
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If the spark plug nose insulator is greyish in color or is blistered:
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To adjust dwell in a distributor which uses electronic ignition, the breaker plate would be moved opposite to distribute rotation.
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Wrong!
After changing a turbocharger, a technician should:
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At which location do you measure cam ground pistons?
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Wrong!
Where should ring gap be measured on a deg-lazed liner?
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What is the characteristic of a Roots type blower?
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If a valve seat is not installed low enough in the head what will result:
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What does a limiting speed governor control?
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What happens if a full flow oil filter becomes plugged?
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If an engine coolant water pump impeller is installed too far away from the housing it will:
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What would cause oil to appear in the turbo crossover to the intake manifold?
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Wrong!
Where is the emergency shut down on a Detroit Diesel?
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Wrong!
When grinding valves and seats, if a valve lap mark is too close to the margins of the valve:
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When grinding valves and seats and restoring or replacing valve guides, the correct order of service is:
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Valve springs should be checked for:
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Wrong!
A cam ground piston is narrower across the:
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The main difference between a gasoline engine and a diesel is in the:
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What might be the problem with a diesel engine that has an increase in power and excessive smoke?
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Wrong!
On a 6 cylinder in-line engine, (firing order 153624) if #1 is firing, what is #3 doing?
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The likely cause of a broken crankshaft near the front of an engine could be:
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Valve overlap is the total degrees of duration:
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Bearing crush is best defined as:
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Excessive crankshaft end clearance could cause:
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Wrong!
A surge tank in a cooling system is used to:
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A cooling system that operates with a 10 lb. radiator cap will have
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Glycol based anti freeze in the oil will:
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Wrong!
High air box pressure in a Detroit Diesel, two stroke cycle engine could be caused by:
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The instrument used to measured exhaust temperature is the:
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Wrong!
Excessive black smoke under load could be caused by:
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Wrong!
Burned or damaged pistons in a diesel engine could be caused by:
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Wrong!
When checking turbocharger boost pressure the engine should:
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To improve combustion, all diesel engines use:
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Loose Cummins injector adjustment will cause:
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Wrong!
To adjust the valves and injectors on a Cummins engine, position on:
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Caterpillar capsule type injectors are adjusted:
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Wrong!
A seized CAT injection pumping unit will cause:
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Wrong!
Detroit Diesel injectors should be timed when:
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A leaking injector fuel return tube on a Detroit Diesel engine would cause:
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Wrong!
A mechanical governor operates on the principle of:
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Wrong!
A fifth wheel should be adjusted:
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Wrong!
Which of the following is the correct frame repair procedure?
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Wrong!
When repairing a cracked frame rail:
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When unlike metals are fastened together:
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The first step when inspecting a frame for defects is to:
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An example of a monocoque frame would be:
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Progressive rate springs:
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What is the name of the gas used in hydro-air suspension?
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Leaf spring center bolts are:
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The parallel string method of checking frame alignment does not check for:
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On rubber block suspension, to check condition of the offset/drive pin brackets and bushings you would:
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All spring packs use a centre bolt to locate the spring to the axle or trunion
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Equalizer beams
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Torque rods
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What might be damaged by lifting the frame on an air ride suspension?
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On an air ride system what does the leveling valve do?
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Wrong!
A broken main spring leaf with the crack extending across the center bolt hole would be an indication that the:
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Wrong!
The device that prevents semi-elliptical spring leaves from excessive separation when a wheel drops in a hole is called a(n):
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What is the purpose of a venturi in a carburetor?
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Wrong!
A Caterpillar transfer pump:
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Wrong!
What does cetane stand for?
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A gasoline with a high octane rating
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What is the correct thing to do when disconnecting a gasoline fuel injection line?
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Wrong!
In a carburetor, a low float level would result in:
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Wrong!
The lower the octane rating of gasoline:
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Wrong!
In an Cummins engine using a mechanical injector, how would you check for an engine miss?
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To check which cylinder is missing on an engine equipped with an inline injection pump and nozzles in the cylinder head, you would:
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Wrong!
On gasoline engine equipped with an EGR valve the valve opens and
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Wrong!
Which type of fuel system uses a cam ring and plungers to pressurize the fuel
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Wrong!
Pintle type nozzles are used with:
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Wrong!
A distributor type pump uses a ___________________ to control the delivery rate.
Correct!
Wrong!
The purpose of the residual check valve in a hydraulic brake system is to:
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Wrong!
If all the brakes drag on a vehicle the most likely cause would be
Correct!
Wrong!
What is responsible for causing the pads to move away from the rotors on a disc brake system
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Wrong!
Which item would be faulty if brake fluid were to leak out of the firewall side of the master cylinder?
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Wrong!
If a rotor had faulty parallelism what drive-ability problem may be incurred?
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Wrong!
On a hydraulic brake system, what are the forms of power assist failure backup?
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Wrong!
What should be used to clean internal hydraulic brake parts?
Correct!
Wrong!
Performing a check of a vacuum booster on a hydraulic brake system should result in the pedal:
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Wrong!
What is the purpose of a metering valve in a hydraulic brake system?
Correct!
Wrong!
The difference between an unbalanced vane pump and a balanced vane pump is the:
Correct!
Wrong!
Cavitation could occur when:
Correct!
Wrong!
A pneumatic accumulator is filled with:
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Wrong!
An open center system can bet be described as on in which:
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Wrong!
A four connection (four way) spool valve is used in conjunction with a:
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Wrong!
Viscocity can best be described by:
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Wrong!
The pump inlet size should:
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Wrong!
The most likely cause of decreased hydraulic actuator speed would be:
Correct!
Wrong!
The force developed by a cylinder is calculated by:
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Wrong!
The dash number used for sizing hydraulic hose refers to its inner diameter in:
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Wrong!
When making up a hose that requires the end to be skived to install the replaceable fitting, the amount skived is:
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Wrong!
Flow rate is best defined as:
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Wrong!
In a system with a variable displacement pump, the volume of the fluid moved by the pump will:
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Wrong!
A cylinder tends to creep when stopped in mid-stroke, the control valve checked out as operational and there is no external leakage, the next thing to check for would be:
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Wrong!
A fire referred to as a Class B would occur in:
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Wrong!
Worker's Compensation regulations state that the tool-rest on a bench grinder should be no further away from the grinding wheel than:
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Wrong!
A telescoping gauge is used for measuring the:
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Wrong!
In the adjacent figure, the reading on the 0 to 1 inch outside micrometer:
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Wrong!
An engine having a original bore size of 4 3/8 inches is rebored .030 oversize. The resulting bore size is:
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Wrong!
Acetylene hose fittings are:
Correct!
Wrong!
The tap generally used to first cut threads in a drilled hole is the:
Correct!
Wrong!
A JIC connection is flared at an angle of:
Correct!
Wrong!
Pipe size is generally measured by the:
Correct!
Wrong!
If you use a hammer and a punch to install a bearing on a tight shaft and inside a tight bore damage to the bearing roller or ball raceways may result in the form of:
Correct!
Wrong!
Only when full fielding the alternator does the output meet the alternator rating, what may be the problem?
Correct!
Wrong!
To polarized a B type generator
Correct!
Wrong!
A sulphated battery can be caused by:
Correct!
Wrong!
The cells in a battery are normally connected in:
Correct!
Wrong!
With little or no current draw and no starter rotation the most likely cause would be:
Correct!
Wrong!
To prevent overheating of the starter motor, cranking time should not exceed:
Correct!
Wrong!
On a vehicle equipped with a good series parallel switch, leaving the lights on with the engine stopped will:
Correct!
Wrong!
When testing an alternator rotor your ohmeter reads "0" is this acceptable?
Correct!
Wrong!
What is the cause of wheel tramp?
Correct!
Wrong!
A cause of steering pulling in one direction would be
Correct!
Wrong!
A cause for steering to wander would be incorrect:
Correct!
Wrong!
Feather edging of tires is caused by excessive:
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Wrong!
Misaligned drive axles, will cause steering axle tires to wear:
Correct!
Wrong!
The use of tapered wheel bearing provides for:
Correct!
Wrong!
Leakage of the sector shaft seal (near the pitman arm) on a power steering box might be caused by:
Correct!
Wrong!
The assembly that supports a track machine is called:
Correct!
Wrong!
Mechanic A says that track frames may be made of box or channel steel. Mechanic B says that track frames are kept in alignment with a diagonal brace. Who is right?
Correct!
Wrong!
The purpose of a recoil mechanism is to:
Correct!
Wrong!
Mechanic A says that the hydraulic track adjuster uses hydraulic fluid from the transmission for operation. Mechanic B says that front idlers are attached directly to the final drive unit. Who is right?
Correct!
Wrong!
Bolt on segments are preferred over spoke sprockets because
Correct!
Wrong!
If a track chain uses two conical washers installed back-to-back in the link counter bore they are called sealed chain.
Correct!
Wrong!
The best shoe for use in areas where traction is important would be
Correct!
Wrong!
The high drive system described in the text has
Correct!
Wrong!
To control the movement of the major bogies, the suspension system uses
Correct!
Wrong!
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