Engine final

16.1 liters

A Volvo six-cylinder engine has a bore of 144 mm and a stroke of 165 mm. Calculate the total displacement and express it in liters. a. 11.1 liters b. 12.7 liters c. 14.8 liters d. 16.1 liters

10.5 liters

A popular six-cylinder Navistar diesel engine has a bore of 120 mm and a stroke of 155 mm. What is the engine displacement? a. 9.4 liters b. 10.5 liters c. 12.4 liters d. 13.6 liters

16.1 liters

A six-cylinder engine has a bore of 5.69 inches and a stroke of 6.5 inches. Calculate the total displacement and express it in liters. a. 11.1 liters b. 12.7 liters c. 14.8 liters d. 16.1 liters

12.9 liters

A six-cylinder, Paccar MX 360 engine has a bore of 130 mm and stroke of 162 mm. Calculate the displacement of this engine. a. 11.1 liters b. 11.9 liters c. 12.9 liters d. 14 liters

scavenging

Engine breathing in the two-stroke cycle is usually referred to as: a. inertial. b. scavenging. c. exhaust displacement.

power

In which of the four strokes of the cycle is the cylinder pressure at its highest in a running diesel engine? a. Intake b. Compression c. Power d. Exhaust

both a and b

Technician A says that DEF is available at most diesel refueling stations. Technician B says that DEF can be obtained from most manufacturer dealerships. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

neither a nor b

Technician A says that EG is always colored green. Technician B says that PG is always colored red. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

neither a nor b

Technician A says that the fastest way to break in a diesel engine is to add a charge of aftermarket break-in solution to the engine oil. Technician B says that most truck engine OEMs recommend adding fuel conditioners to diesel fuel tanks to improve the winter drivability of diesel engines. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

both a and b

Technician A states that on most internal engine compression brakes, the effective braking stroke of the piston is the compression stroke. Technician B states that on some engine brake systems, both the compression and exhaust strokes can deliver retarding force. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

both a and b

Technician A states that the Cummins Intebrake on pre-2010 ISX is capable of optioning engine braking on just one engine cylinder. Technician B states that the Cummins Intebrake on post-2010 ISX functions as both an internal and external engine compression brake. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

technician b only

Technician A states that the force used to actuate the hydraulic circuit in a typical Jacobs brake is delivered by an electrically actuated solenoid. Technician B states that Jacobs brake solenoids act as a pilot switch to control oil flow to the hydraulic actuation circuit. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor B

aggressive driving

The DEF consumed by a truck SCR system is unusually high. Which of the following is the likely cause? a. Contaminated DEF b. Aggressive driving c. ECM programming d. Plugged injector

electric-over-hydraulic

The effective braking cycle on most internal engine compression brakes fitted to hydromechanical engines is actuated by using which of the following sequences? a. Electric-over-hydraulic b. Electric-over-pneumatic c. Pneumatic-over-hydraulic d. Hydraulic-over-electric

kinetic energy

The energy of motion is known as: a. inertia. b. kinetic energy. c. thermal energy. d. potential energy.

heat energy

The energy of vehicle motion is ultimately converted to what energy form when an engine compression brake is used? a. Kinetic energy b. Heat energy c. Chemical energy d. Potential energy

energy-absorbing compressor

The operating principle of an internal engine compression brake is to convert the engine into an: a. energy-absorbing compressor b. energy-releasing machine c. inertia-absorbing device d. inertia-producing device

inertia

The tendency of an object in motion to stay in motion is known as: a. kinetic energy. b. dynamic friction. c. inertia. d. mechanical force.

40%

What percentage of the potential heat energy of the fuel does the modern diesel engine convert to kinetic energy when the engine is operating close to optimum efficiency? a. 20% b. 40% c. 60% d. 80%

4 quarts

What quantity of oil does the distance from the top to the bottom of the crosshatch area on a typical heavy-duty diesel engine represent? a. 1.0 quart (0.95 L) b. 2.0 quarts (1.9 L) c. 4.0 quarts (3.8 L) d. 8.0 quarts (7.5 L)

multiplexing

What vehicle technology enables nonengine controllers to request engine braking cycles? a. Electromechanical switches b. Multiplexing c. Smart switches d. Electrohydraulics

60%

When a modern diesel engine is running at optimum efficiency, the percentage of rejected heat would typically be: a. 20%. b. 40%. c. 60%. d. 80%.

close to TDC at the completion of the compression stroke

When an internal engine compression brake is actuated, where does gas blowdown occur? a. At valve overlap b. Close to BDC following the power stroke c. At the beginning of the exhaust stroke d. Close to TDC at the completion of the compression stroke

15 degrees ATDC

When running an engine at idle speed, which would typically be the optimum location to peak the cylinder pressure? a. 20 degrees BTDC b. 10 degrees BTDC c. TDC d. 15 degrees ATDC

at the highest rpm

When will any kind of engine brake usually operate at peak efficiency? a. At idle rpm b. At peak torque rpm c. At rated speed rpm d. At the highest rpm

the first law of thermodynamics

Which law states that all energy forms are convertible? a. The first law of thermodynamics b. The second law of thermodynamics c. Boyle's law d. Charles's law

total piston swept volume

Which of the following accurately describes engine displacement? a. Total piston swept volume b. Mean effective pressure c. Peak horsepower d. Peak torque

Cummins Intebrake on pre-2010 ISX

Which of the following engine brakes offers progressive step braking using from one to all six cylinders? a. Cummins Intebrake on pre-2010 ISX b. Mercedes-Benz CTV c. Mack Trucks Jacobs on E-Tech d. Flywheel hydraulic retarders

connect EST to chassis data bus

Which of the following is a requirement of a triage inspection? a. Connect EST to chassis data bus b. Drain the engine oil c. Replace the fuel filters d. All of the above

when the restriction gauge indicates it is beginning to plug

Which of the following is the best indicator of when a diesel engine air filter be changed? a. At every engine wet service b. Every time the oil filter is changed c. Every 6 months d. When the restriction gauge indicates it is beginning to plug

drain the water separator sump

Which of the following is the correct course of action when a WIF alert is posted to the DDU? a. Drain the water separator sump b. Replace the fuel filters c. Replace the water separator d. All of the above

clear

Which of the following would best describe the color of DEF? a. Blue b. Clear c. Amber d. Red

feedback assembly

Which of the seven subcircuits of the engine deals with the camshaft, valvetrains, and mechanical actuation of injectors and fuel pumping apparatus? a. Powertrain b. Feedback assembly c. Lubrication circuit d. Engine housing circuit

internal compression brake

Which type of engine brake uses the compression stroke of the piston as its retarding stroke? a. Internal compression brake b. External compression brake c. Hydraulic retarder d. Volvo EPG

external compression brake

Which type of engine brake uses the exhaust stroke of the piston as its retarding stroke? a. Internal compression brake b. External compression brake c. Hydraulic retarder

blue

hat color is used to denote a DEF fill cap? a. White b. Green c. Red d. Blue