Top dead center (TDC) defines the position of what engine component?

The following are all advantages of diesel engines, EXCEPT __________.

Select one:

Thermostat operational movement is controlled by a(n) __________.

How many crankshaft rotations are required to complete all four strokes of the Otto cycle?

Select one:

When the thermostat opens, coolant flows to the __________.

A heavy-duty diesel engine’s highest torque output is available __________.

Select one:

A diesel engine’s higher compression ratio translates into __________.

Select one:

Tech A says the intake stroke is happening when the piston is traveling from the top (TDC) to the bottom (BDC). Tech B says the following stroke is the compression stroke, and it compresses the air trapped in the cylinder. Who is correct?

At which of the following compression ratios does the efficiency of an engine begin to diminish with increasing compression?

Select one:

Tech A says to complete the four strokes of the engine cycle, the crankshaft turns one complete revolution. Tech B says one revolution will allow only half of the complete cycle.

What is the total engine displacement in a six-cylinder internal combustion engine when cylinder displacement equals 45 cu/in?

Most combustion slobber is produced during: Select one:

Clearance volume can be directly related to __________.

The bore of the engine is__________________.

The clearance volume of the engine is__________________.

The stroke of the engine is__________________.

What are the four strokes of 1 complete engine cycle in the order of occurrence?

Tech A says compression ignition engines are totally different than gasoline spark ignited engines. Tech B says there are some similarities because both systems work on the same principle; they only differ in how the fuel is ignited. Who is correct?

Which component would be considered the largest of the "structure components" with the engine assembly? Select one

Who developed the concept of the CI engine?

Tech A says the diesel engine must generate much higher temperatures to create combustion. Tech B says these high temperatures are created by more compression in the cylinder. Who is correct?

Technician A says transferring heat absorbed from the engine to the atmosphere is the primary function of the cooling system. Technician B says to do this, radiators that allow air to pass though cooling fins to release heat are used. Who is correct?

Which of the following is correct concerning combustion in diesel engines?

Select one:

What is ULSD?

Technician A says biodiesel is manufactured from algae. Technician B says biodiesel is manufactured from beef tallow and soybeans. Who is correct?

Select one:

__________ was used to make the first biodiesel fuel.

Technician A says coal dust was the original diesel fuel. Technician B says the first biodiesel fuel was made out of peanut oil. Who is correct?

Select one:

Piston pins are also called _______ pins.

Any bolt-tightening sequence should take the cylinder head down in a minimum of ______

progressive steps of torque

The gap between the straight edge and a given surface can be measured by using ______.

What is a major cause of catastrophic engine failure?

True or False: Engine design has been greatly influenced by governmental regulations.

Technician A says the flywheel is a heavy, round casting bolted to the end of the crankshaft.

Technician B says the heavy mass of the flywheel develops considerable inertia that is used to

smooth out the intermittent impulses of the firing strokes.

Who is correct?

In the 1920s, who developed practical, compact injection pumps and governors that allowed the use of smaller diesel engines to power trucks, buses, and automobiles?

Technician A says the NTSB is responsible for diesel fuel specifications and test methods for petroleum-based diesel fuel and biodiesel fuel. Technician B says the ASTM is responsible for diesel fuel specifications and test methods for petroleum-based diesel fuel and biodiesel fuel. Who is correct?

Which of the following is correct concerning cylinder displacement?

Select one:

What components have increased wear from fuel with high Sulphur content?

The lowest temperature at which a volatile materials vapors ignite if given an ignition source is called_______________.

Pick only one:

All of the following are advantages of Biodiesel EXCEPT:

Any bolt-tightening sequence should take the cylinder head down in a minimum of ______

progressive steps of torque

The gap between the straight edge and a given surface can be measured by using ______.

What does black smoke / exhaust represent?

What agency sets the standards for emissions in the United States?

Heavy Duty Diesel Engines have a durability requirement to remain emission compliant and not exceed certification limits for ___________________

_____________________________ is a metal casting that forms the top of the engine and seals the combustion chamber.

The ability of a fluid to flow with in itself or its resistance to flow is called___________________

The ___________________ transmits the motion of the camshaft to the rockers and are usually hollow.

The ________________________________ method of applying torque requires initial torque plus additional angular or degrees of turning.

What is the first part of the exhaust system?

What is the term whose meaning is a measure of the ignition quality of Diesel Fuel?

How is diesel fuel manufactured?

Engine Performance factors which are influenced by the ignition quality of fuel are cold starting, engine warm up, rough running, acceleration, and _______________.

What is Lubricity?

Who regulates diesel and Biodiesel fuel quality?

The grade of diesel fuel can be identified by a technician by measuring fuel’s density with a ___________.

Engines can be classified by their air intake process. They are __________________.

A 4 stroke, 4 cylinder engine is running at 1000 RPM. How many power strokes (ignitions) occur during 1 minute?

The diameter of the engine cylinder is called the ______ and the distance the piston can move is called the ________. The multiplication of these 2 factors provides the engine __________.

What is this component called? What does it pressurize?

Where does the coolant go to when it passes through the open thermostat ?

What percent of catastrophic engine failures are related to the cooling system?

Fuel type, Fuel delivery system, and application are examples of ______________.

For every 1 PSI of pressure the boiling point of a liquid increases by ___ degrees.

Who is known as the father of the highway diesel engine?

The major difference in two stroke and a four stroke engines is

The water pump on an engine is designed to

The radiator is designed to

The boiling point of the coolant can be raised if the cooling system is ___________.

What does this component do?

The flywheel is a heavy weight attached to the crankshaft that

Which of the following is correct concerning combustion?

Select one:

__________ is the minimum mass of air required to completely burn all fuel in the combustion chamber so that no fuel or air remains after combustion. 

Select one:

The heat source to ignite diesel fuel within a compression ignition (CI) diesel engine is __________.

Select one:

Technician A says EPA standards require medium-duty diesels to remain emission compliant for a useful life of 5 years or 100,000 miles (160934.4 km). Technician B says heavy-duty diesels must have a useful life of 3 years or 100,000 miles (160934.4 km). Who is correct?

Select one:

Turns reciprocating motion (up and down) into rotary motion (round and round

What does the term TDC refer to?

What is the name of this part?

What does BDC stand for?

During the first stroke (Intake), what valves are open-if any?

What stroke is being represented by the image?

The piston is traveling down and both valves are closed.

What stroke is being represented by the image?

The piston is traveling up and both valves are closed.

What stroke is being represented by the image?

The piston is traveling down and the intake valve is open.

What stroke is being represented by the image?

The piston is traveling up and the exhaust valve is open.

What is the main difference between spark and compression ignition?

What is this component called? What does it pressurize?

Technician A says that cylinder components are the most highly stressed parts of the diesel engine. Technician B says cylinder pressures can now exceed 3000 pounds per square inch (psi) (20,684 kilopascals [kPa]) of force. Who is correct?

Select one:

Cylinder components are the engine components first used to convert combustion forces into ___________ power.

Which piston ring has a coiled expander?

Technician A says the oil control ring does not use a metal expander. Technician B says like the intermediate and compression rings, the oil control ring is vulnerable to premature wear from dirt ingestion into the engine. Who is correct?

Technician A says the the area of the piston around the piston pin bore is the pin boss. Technician B says the piston pin bore is usually off set toward the minor side thrust portion of the cylinder. Who is correct?

Select one:

Piston pins are the connecting joint between the piston and the __________.

Select one:

Technician A says connecting rods use an I-beam cross section, which has good weight-to-strength characteristics and resists bending. Technician B says matching marks on a connecting rod identify the assembled position. Who is correct?

If 20 % of the cylinder cross hatch is missing that cylinder is considered ______worn.

Technician A says that when replacing piston rings, the end gaps of all piston rings should be placed 90 degrees apart in a three-ring pack. Technician B says about three strokes per second is required at 120 rpm to establish the correct angle on the cross-hatch finish. Who is correct?

Select one:

Which of the following are the Injectors commonly cooled by?

What are some of the hazards associated with common-rail diesel systems?

What is the pressure level can produce by Common-rail fuel systems?

Amplified common rail systems increase fuel injection pressure using the __________.

Select one:

What are the consequences if fuel rail pressure valve control fails?

Electronic diesel control systems use a system with no accelerator cable or linkage.

What is this control system referred to as ?

Which of the following is providing control signal in common rail system?

Technician A says the basic concept of common rail injection is simple: supply fuel at injection pressure to a fuel nozzle that electrically controls the injection event. Technician B says the common rail system's modular design lends flexibility for adaptation to any new or updated diesel engine design. Who is correct?

Select one:

When discussing common rail fuel systems; Technician A says to minimize parasitic loss, newer high-pressure fuel pumps have inlet metering capabilities . Technician B says the metering capabilities of newer high-pressure fuel pumps will increase engine power output and fuel economy. Who is correct?

Select one:

At too low of a temperature, the __________ in fuel becomes too viscous to properly flow through filters and lines.

Technician A says that low diesel fuel temperature causes problems, but high fuel temperatures are not a problem. Technician B says that both low and high fuel temperature can cause problems with diesel fuel. Who is correct?

Select one:

A fuel tank pickup tube works by means of __________.

Select one:

Technician A says that fuel-water separators, water-in-fuel sensors, fuel heaters, and filters are often integrated into a single compact unit. Technician B says that water-in-fuel (WIF) sensors use an electrical conductivity probe to sense a specific level of water in fuel and cause a dash-mounted light to illuminate. Who is correct?

Select one:

All of the following are functions of the low-pressure fuel system, EXCEPT __________.

Select one:

Low-pressure fuel systems include features to inform the operator of _________________. 

Select one:

Cloud point is __________.

Pour point is __________.

What is Lubricity?

What is the minimum cetane (CN) for on highway diesel fuel?

Which of the following is correct concerning combustion in diesel engines?

Select one:

Who regulates diesel and Biodiesel fuel quality?

Technician A says that diesel engine combustion efficiency is typically less than 75% when using fuel without additives. Technician B says that when clean, good-quality fuel is used, there is no need to add anything to fuel. Who is correct?

Select one:

Technician A says that a purpose-made fuel hydrometer is used to measure the API number of diesel fuel. Technician B says fuel's API number is directly related to the fuels grade. Who is correct?

Select one:

Engines can be classified by their air intake process. They are __________________.

High fuel system pressurization is required to __________.

Select one:

Which engine system is the most expensive to manufacturer?

Select one:

Increasing fuel atomization injection pressures promotes __________.

Select one:

Technician A says an electronic governor in a high-pressure injection system is software-based. Technician B says an electronic governor in a high-pressure injection system controls the injection of a precisely metered amount of fuel and also adjusts injection timing and injection rate. Who is correct?

Select one:

Technician A says idle adaptation involves making adjustments to injection quantities based on changes to crankshaft speed produced during every power impulse. Technician B says most engines built since 2002 generally enable adaptive balance to take place throughout the engine's entire operating range. Who is correct?

Select one:

Evaluation of injector performance by performing a cylinder cut-out test may be evident by viewing __________ data.

Select one:

Higher combustion pressures multiplied by the length of the crankshaft throw equals higher   __________.

Select one:

Technician A says to adjust for the variation in combustion time as engine load changes, the fuel system must have the capability to adjust injection timing based on fuel delivery quantities. Technician B says that under load, fuel systems should advance the injection timing. Who is correct?

Select one:

Retarded engine timing will __________.

Select one:

Which one of the following is the timing strategy used for cold start conditions?

Select one:

Which phase of fuel injection occurs first?

Select one:

Electronically controlled variable pressure fuel systems can select exactly which injection pressure is best for all the below except?

Select one:

Vibration isolators __________.

Select one:

Which diesel fuel injection system is one of the most commonly used today?

Select one:

Engine Performance factors which are influenced by the ignition quality of fuel are cold starting, engine warm up, rough running, acceleration, and _______________.

Sulphur has to be added to diesel fuel to give it an odor for safety purposes.

Tech Andrew says that when Replacing an injector you can reuse the O-rings if you inspect them first; Tech Brandon says that when replacing an injector you must lubricate and install new O-rings every time.

Technician A says valve bodies transfer heat from combustion and pressurization of fuel to the engine coolant. Technician B says nozzle valve tips transfer heat from combustion and pressurization of fuel to the engine coolant. Who is correct?

Select one:

Technician A says water can accumulate below the nozzle valve, vaporize, and cause a tip to blow off an injector. Technician B says oil can accumulate below the nozzle valve, vaporize, and cause a tip to blow off an injector. Who is correct?

Actuating the injectors with an overhead camshaft permits the least amount of injection __________.

Select one:

Technician A says that electronic unit pump injection systems in operation are adjustment-free and require little maintenance

except during engine overhaul or replacement due to failure. Technician B says EUI plunger travel is adjustable. Who is correct?

​

​

Select one:

Technician A says a unit pump is used by the ECM to adjust timing and fuel flow through the injector. Technician B says a calibration code is used by the ECM to adjust timing and fuel flow through the injector. Who is correct?

________________________ measures crankshaft speed during each power stroke and determines if one or more cylinders power the crankshaft less or more than needed

Cylinder head casting irregularities and variations in sealing washer thicknesses and between injectors may produce different amounts of injector tip __________.

Select one:

You are the technician and the customer has a complaint of the engine does not start. It is turning over but mot starting. Which of the following could be a possible reason for the no start condition.

Black smoke from the exhaust is an indication of_______.