Chapter 4, 6, 15

Potential energy

What type of energy does compressed air have?

73.7 pounds/foot

100 N meters are equal to:

The loaded truck

2 identically powered trucks, one loaded and 1 unloaded, complete a 200 mile journey. The loaded truck has twice the gross vehicle weight of the unloaded truck and completes the journey averaging 55 miles an hour. The unloaded truck completes the journey averaging 60 miles an hour which of the 2 trucks has done the most work?

Work accomplished is equal

2 technicians named a and B each weighing 200 pounds Jog the distance of one mile. Technician a completes the distance and 15 minutes and Technician B completes the distance and 20. Who has done the most work?

Technician a

2 technicians named a and B each weighing 200 pounds, jog a distance of one mile. Technician a completes the distance and 15 minutes and technician B completes the distance in 20 minutes. Which technician has the most power?

466 kW

A Cummins ISX is rated at 625 BHP. Convert to Kilowatts :

377 Kilowatts

A Detroit Diesel DD15 engine dynamometer tests at 505 BHP. Convert to kW:

450 BHP

A Mack truck MP8 engine is rated at 335 kW break power. Convert 2 horse power:

928 in³

A Navistar Maxxforce 15 engine has a total displacement of 15.2 Liters. Convert this Into cubic inches

Cap all inlet and outlet ports

After you remove a Turbo charger that will be returned to service, from an engine, which of the following should be done?

Customer data programming

Before removing and electronically managed engine which of the following should be downloaded and retained?

7.6 Liters

Convert this specified displacement of Maxxforce DT engine with a displacement of 466 in³ in to liters.

4 times

How many times does any one piston change direction during 1 complete diesel cycle?

Bore and stroke dimensions are equal

If an engine is described as square, which is a following would be true?

Around 15 degrees ATDC

If an engine is run for maximum mechanical efficiency, where should peak cylinder combustion pressure be achieved?

Engine torque

If the length of a crankshaft the row was changed either up or down, which of the following would be directly affected?

10%

In a modern diesel engine, what percentage of total power is typically consumed in overcoming pumping and frictional losses?

There is no manifold boost

In an engine is described as naturally aspirated, which of the following should be true?

Check the OEM service literature

On engines with a non volitile ram component, what should you do before disconnecting the batteries, prior to removing the engine?

Technician b only

Technician A says that top dead center (TDC) is simply the point at which a piston stops during its upward travel. Technician B says that piston TDC is the exact midpoint that occurs between the completion of an up Stroke and the beginning of a downstroke. Who is correct?

Both a and B are correct

Technician a says that Turbochargers are used to aspirate the cylinders on most commercial diesel engines. technician B says that Turbochargers can help expel end gas during valve overlap. Who is correct?

Technician a only

Technician a says that peak combustion pressures in modern diesel engines may be 5 times greater than the compression pressure and some modes of operation. Technician B says that while a diesel engine is idling, compression pressures may exceed combustion pressures. Who is correct?

Technician be only

Technician a says that valve overlap takes place as the piston complete its compression stroke. Technician B says that cylinder scavenging takes place in the valve overlap.

Divide by 61

What do you do to convert cubic inches into liters?

Checking cylinder block line bore

What is a master bar used for?

600 psi

What is a typical compression pressure achieved on a current highway truck diesel?

Expansion stroke

What is another name for a power stroke in an engine cycle?

Expansion stroke

What is another name for the power stroke in the engine cycle?

Turbo boost

What is another way of saying manifold boost?

Cylinder pressure

What is the force used in a diesel engine to produce mechanical output?

Power

What is the rate of performing work and known as?

Tag by location for inspection

What should be done with a set of main and rod cap bearings on removal from an engine?

Machinists Straight edge

What should be used to align the cylinder heads on each engine with multiple heads before torquing the cylinder head bolts?

Brake horse power

What terms do trapped diesel engine manufacturers use to write the power of their engines?

40%

What would be the highest thermal efficiency available in a current truck diesel engine?

The cap and big end would not abut

What would happen if you mismatched a cracked rod cap with the rod assembly?

Engine vibration

What would most likely result if an engine was reassembled with one connecting rod with a weight class two increments over specification.

330 lbs through a 100' and 60 seconds'

When James Watt was studying draft horse working ability, how much power did he reckon the horse was capable of lifting?

Indicate the housing concentricity

When a flywheel housing is installed to an engine block, which of the following is recommended?

Reposition the flywheel housing

When a flywheel housing measures out of spec while performing flywheel housing concentricity run out measurements, Which are the following would represent the minimal level of repair required?

Pair of equal sized thickness gages

When checking connecting rod side play which of the following tools is required if you are using the recommended method?

Time

When comparing work accomplished with power, which of the following helps to find power but has nothing to do with work?

Valve overlap

When does scavenging occur in the 4 stroke, diesel cycle?

When exhaust valve 1st opens

When exactly does the gas blow down phase occur?

NW,SW,SE,NE,NW

When indicating a flywheel housing for concentricity to the crankshaft, which of the following reference points on the flywheel face and sequence would produce reliable results?

0.007 inches

When indicating a flywheel housing you measure 0.004 inches positive and 0.003 inches negative through on revolution. What is the total indicated run out(TIR)?

BSFC

Which of the following acronyms is used by manufacturers to indicate actual fuel consumption?

Lever

Which of the following best describes the mechanical role of a crankshaft throw in reaction to the crankshaft centerline?

17:1

Which of the following compression ratios would be typical of a current; Turbocharged highway truck diesel engine?

Volume displaced by piston through its stroke.

Which of the following correctly defines piston swept volume?

Peak torque to Rated speed RPM

Which of the following correctly identifies torque rise rpm?

2 times crank throw

Which of the following defines actual piston stroke?

Spreader bar

Which of the following devices should be used in conjunction with a hoist to remove an engine from a chassis?

Energy of motion

Which of the following is another way of saying kinetic energy?

Turning effort

Which of the following is the more accurate way of expressing torque?

SAE power

Which of the following methods of measuring horse power when applied to the same engine will usually produce the lowest rating?

Volumetric efficiency

Which of the following terms is used to describe the overall breathing efficiency of an engine?

Insufficient bearing clearance

While checking main bearings clearance on an inverted diesel engine, the strip of plastigage under one main shows notably more squish then the remaining mains. What does this likely indicate on this main bearing?

They are often recommended for one off usage

Why should technicians be cautious about re using fasteners described as torque to yield?

720 degrees rotation

the four strokes of the diesel cycle take place over:

BDC

which of the following acronyms is used to describe an engine piston that is at the exact bottom of its travel?