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  • Format: (000) 000-0000.

  • Engine

  • 1. Which checks are performed to verify low power on a diesel engine during a road test?
  • 2. An engine is losing coolant and there is no external leakage. What is done to determine the causes of the problem?
  • 3. When troubleshooting a cooling system, oil is found in the coolant. how is the source of the contamination determined?
  • 4. What is done when the oil pressure fluctuates?
  • 5. A truck has repeated front crank seal failures. What is the cause?
  • 6. What is done to detect a leak on the primary side of a diesel engine fuel system?
  • 7. An injector has been replaced. Shortly after replacement, the engine oil is found to be diluted with fuel. What is done?
  • 8. An engine experienced a major connecting rod bearing failure. What is done to the oil cooler during the engine overhaul?
  • 9. What is the recommended ratio to use when replacing engine water, 25coolant with standard antifreeze?
  • 10. An engine is using too much oil. Technician A says that worn valve guides could be the cause. Technician B says that tapered cylinder walls could be the cause. Who is right?
  • 11. While performing a cylinder leakage test on an engine, the technician sees air bubbles in the upper radiator tank.Technician A says that a cracked head could be the cause. Technician B says that a cracked block could be the cause. Who is right?
  • 12. Technician A says that main bearing oil clearance can be checked with plastigage. Technician B says that main bearing oil clearance can be checked with a feeler gauge. Who is right?
  • 13. This question contains the word EXCEPT. Read the question carefully before choosing your answer. Engine detonation (knock) could be caused by any of the EXCEPT:
  • 14. When a diesel engine is operated under a load, coolant continually comes out of the radiator overflow and there are bubbles in the radiator. Which of these is the most likely cause?
  • 15. A diesel engine has excessive black smoke when started in the morning. Which of these could be the cause?
  • 16. A diesel engine with wet lines has been running hot, and there is coolant in the crankcase. The most likely cause is.
  • 17. Diesel engine cylinder liner protrusion (height) can be adjusted by selecting the correct size:
  • 18. A diesel engine has low power and low turbocharger boost pressure is found. Technician A says that a leaking exhaust manifold could be the cause. Technician B says that a lugged turbocharger oil return line could be the cause. Who is right?
  • 19. What should be done after installing a new accessory belt?

  • Transmission & drive line

  • 1. What causes repeated low mileage U-joint failure?
  • 2. Tech A says that the pressure plate friction surface rides on the flywheel friction surface to transmit torque. Tech B says that the flywheel can either be flat or stepped. Who is correct?
  • 3. Tech A says that a leaking rear main seal can cause clutch damage. Tech B Says that clutch chatter is a result of a bad throw-out bearing. Who is correct?
  • 4. Tech A says that the flywheel runout can be checked with a dial indicator. Tech B says that when checking flywheel runout, it is good practice to also Check crankshaft end play. Who is correct?
  • 5. Tech A says that clutch slippage can be a result of excessively strong pressure plate springs(s). Tech B says that when replacing the friction disc, it is good practice to also replace the pressure plate. Who is correct?
  • 6. Tech A says that the pilot bearing can be a needle - style bearing. Tech B says that the pilot bearing can be a brass bushing style. Who is correct?
  • 7. Some transfer cases have a chai inside them to transfer torque to the wheels.
  • 8. Tech A says that in a conventional transmission, the gears freewheel around the main shaft until they are locked to it by the synchronizer. Tech B says that when not engaged, main shaft gears slide away from the counter gears until they are no longer in mesh. Who is correct?
  • 9. The vehicle operator states that the dashboard gauge indicates the transmission is overheating. Tech A says that the transmission may be low on oil. Tech B says that if the oil does not smell burned, the gauge should be replaced. Who is correct?
  • 10. Tech A says that planetary gear sets are used in all automatic transmissions. Tech B says that planetary gear sets are often combined together to create the needed gear ratios for a transmission. Who is correct?
  • 11. Tech A says that the torque converters multiply the amount of torque transmitted from the engine to the transmission. Tech B says that the torque converter couples and uncouples the engine and transmission as the vehicle stops and starts in traffic. Who is correct?
  • 12. Tech A says that an orifice is a restriction. Tech B says that orifices are used to low down clutch engagement. Who is correct?
  • 13. A vehicle vibrates at certain speeds under acceleration and while coasting. Tech A says that improper phasing is the cause. Tech b says the driveshaft is out-of-balance and should be checked for dent and missing weights. Who is correct?
  • 14. A vehicle is bought in with a driveshaft support bearing that is fractured after only two months since the last replacement. Tech A says the shaft support bearing is misaligned. Tech b says it’s probably just due to normal wear. Who is correct?
  • 15. Three weeks after U-joint replacement, a customer returns to the workshop with complaints of shuddering and vibration in the driveline. Tech A says there must be bending fatigue due to secondary couple loads. Tech B says the problem could be due to excessive u-joint operating angles. Who is correct?’
  • 16. During a scheduled preventative maintenance inspection, a slip spline with excessive wear is discovered. After examining the driveline. Tech A says the wear is due to improper lubrication. Tech B says a higher capacity U-joint and driveshaft tube is needed to fix the problem. Who is correct?
  • 17. Excessive torque load for U-joint and driveshaft size can cause yoke fractures.
  • 18. A truck does not move in any gear. Technician A says that a broken transmission shifter fork could be the cause. Technician B says that a broken transmission output shaft could be the cause. Who is right?
  • 19. The shift on a 13-speed transmission is hard to move. Which of these is the most likely cause?
  • 20. The driver of a truck says that a grinding noise can be heard when the clutch pedal is depressed. Which of these is the most likely cause?
  • 21. A truck with a single rear axle has too much rear axle noise only when the truck is pulling. Which of these is the most likely cause?
  • 22. A drive axle lubricant is a milky color. The most likely cause is:

  • Brakes

  • 1. Excessive oil contamination is found in the secondary reservoir. What is the most likely cause?
  • 2. On a Truck a 412.46 kPa (60 psi) application is required to stop when not coupled to a trailer, and a 206.73 kPa (30 psi) application is required to stop when coupled to a trailer. What should be done?
  • 3. What is the first step to test the function of an antilock relay valve (ARV)?
  • 4. The parking brakes fail to apply on a truck with air brakes.Technician A says that low air pressure in the spring brake chamber could be the cause.Technician B says that a ruptured spring brake diaphragm could be the cause. Who is right?
  • 5. A truck equipped with air brakes has an uneven braking problem. Which of these could be the cause?
  • 6. A service brake on a truck with an air brake system releases too slowly. Technician A says that low air pressure could be the cause. Technician B says that a kinked air line could be the cause. Who is right?
  • 7. A service brake chamber leaks when the brakes are applied. Which of these could be the cause?
  • 8. All the wheels on a truck with air lock up when a small amount of pressure is applied to the treadie (foot) valve. Which of these could be the cause?
  • 9. When an air reservoir tank is drained, there is an excessive amount of moisture. This could be caused by a:
  • 10. All the brakes drag on a truck with hydraulic brakes. Which of these could be the cause?
  • 11. The driver of a truck with air brakes says it has poor stopping power. Any of these could be the cause EXCEPT:
  • 12. Tech A says that the reservoir serves as a storge tank of compressed air for the air brake system. Tech B says that reservoirs may provide a location where air, heated by compression, can be cooled and the water vapour condensed. Who is correct?
  • 13. A Safety valve protects reservoirs from being over - pressurised and bursting. It is normally set at 1,000 – 1,050 kPa
  • 14. Air dryers on HDV braking systems operate o two distinct cycles: charging phase and regeneration (cycling) phase.
  • 15. A relay valve’s primary function on a heavy-duty vehicle is to speed u the application and release of the rear brakes.
  • 16. Tech A says that if slack adjusters are not maintained and adjusted, effective braking is reduced and brake lag application time increases. Tech B says that the objective of the slack adjuster is to ad slack or free - play in the linkage between the pushrod and the brake shoes that occurs naturally as the brake linings wear from constant use. Who is correct?
  • 17. Air-operated disc brakes are rare in HDV’s
  • 18. Tech A says that you would usually find a cam-operated brake on a light-/medium-duty vehicle. Tech B says that you would usually find a cam-operated brake on a large, heavy vehicle. Who is correct?
  • 19. A disc brake is a wheel brake, which speeds rotation of the wheel by the friction caused by pushing brake pads against a brake disc with a set of calipers.
  • 20. Tech A says that if the drum-to-lining clearance is too tight, the result would be dragging brakes. Tech B says if the drum-to-lining clearance is too tight, the result would be overheated brakes. Who is correct?
  • 21. An air compressor’s function is to drain air pressure from the air brake and air auxiliary systems.
  • 22. Tech A says that the reservoir serves as a storge tank of compressed air for the air brake system. Tech B says that reservoirs may provide a location where air, heated by compression, can be cooled and the water vapor condensed. Who is correct?

  • Suspension & steering

  • 1. Tech A says that one primary function of the sway bar is to reduce body roll. Tech B says that sway bars are more common on the rear suspension. Who is correct?
  • 2. Tech A says that the purpose of a multi-axle walking beam-styled suspension includes supporting a vehicle’s weight and cushioning the frame/chassis and the vehicle cab from road shocks. Tech B says that the purpose of a multi-axle walking beam-styled suspension includes allowing for self-aligning during cornering and maintaining axle alignment. Who is correct?
  • 3. Tech A says that rapid deflation of the air bellows when parked is caused by an incorrectly adjusted height valve. Tech B says that it is caused by air leaks. Who is correct?
  • 4. Tech A says that the pressure relief valve maintains a preset minimum pressure in the system. Tech B says that the pressure relief valve prevents excessive pressure. Who is correct?
  • 5. Tech A says that worn tie-rod ends can cause a steering wandering complaint. Tech B says that looseness in and of a power steering pump may be felt as loose steering and is frequently mistaken as a steering gearbox problem. Who is correct?
  • 6. Tech A says the power steering is designed to reduce the driver’s effort when turning. Tech B says that power steering is designed to provide good steering feedback – known as “road feel” – to the driver. Who is correct?
  • 7. Tech A says that oil foaming in the reservoir is caused by pump cavitation. Tech B says that it is caused by loose belts. Who is correct?
  • 8. Tech A says that hard steering is caused by an overloaded front axle. Tech B says that hard steering in one direction is caused by broken reversing springs in the steering gear. Who is correct?
  • 9. Tech A says that excessive tyre wear is caused by worn bushes. Tech B says that excessive vehicle bounce is caused by worn shock absorbers. Who is correct?
  • 10. Tech A says that rapid deflation of the air bellows when parked is caused by an incorrectly adjusted height valve. Tech B says that it is caused by air leaks. Who is correct?
  • 11. Tech A says that ball joints must be unloaded when checking them for wear. Tech B says that ball joints must be loaded when checking them for wear. Who is correct?
  • 12. Tech A says that unwanted looseness or play in the suspension system is extremely dangerous and should be rectified immediately. Tech B says that all suspension systems have some looseness or play and it should be ignored unless the driver complains. Who is correct?
  • 13. Tech A says that power steering fluid lasts for the lifetime of the vehicle and never needs to be changed. Tech B says that the power steering fluid usually has both a hot and a cold indicator on the dipstick to ensure an accurate reding of the fluid level in both conditions. Who is correct?
  • 14. Which of these could cause the front tires of a truck to show a feathered edge wear pattern?
  • 15. The drive axles on a truck with a walking beam suspension are out of alignment. Technician A says that incorrect length torque rods be the cause. Technician B says that worn walking beam bushings could ne the caue. Who is right?
  • 16. The driver of a truck says that it is hard to steer and the steering wheel return is poor.Technician A says that binding kingpins could be the cause. Technician B says that too much toe-in could be the cause. Who is right?
  • 17. Rust streaks coming from around the stud holes of a disc wheel could be caused by:
  • 18. A truck has a history of springs breaking at the centre bolt holes. Technician A says that loose U-bolts could be the cause. Technician B says that loose spring shackles could be the cause. Who is right?
  • 19. A constant buzzing noise is coming from the power steering pump. Technician A says the air in the system could be the cause. Technician B says that a stuck-open relief valve could be the cause. Who is right?
  • 20. The tandem rear axle air suspension ride height rises above normal as the vehicle is unloaded. Which of thee could be the cause?
  • 21. This question contains the word EXCEPT. Read the question carefully before choosing your answer. All of these should be checked before aligning the front wheels on a truck EXCEPT:
  • Should be Empty: