Mid Term Quizz

What is the cylinder displacement when a cylinder radius is two inches and the stroke is three inches?

• 37.68cu/in

• 43.56cu/in

• 51.00cu/in

• 29.89cu/in

Clearance volume can be directly related to __________.

• Power Stroke

• Compression Ratio

• Overlap

• Swept Volume

Technician A says engines have replaceable piston rings to minimize gas leakage past the piston. Technician B says an intermediate ring has compression-sealing functions, but no oil control functions. Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

What component is used to prevent a block camshaft from wearing on the block surface?

• Thrust Washer

• Prevent Washer

• Rubber Washer

• None of these is correct

Technician A says a gear train or valve timing mechanism is used to coordinate the movement of the crankshaft with the camshaft and the valves. Technician B says the gear train does not operate power take-off (PTO) pumps. Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

Where should desired maximum cylinder pressure occur?

• 10–15 degrees BTDC

• 10–15 degrees ATDC

• 10–15 degrees BBDC

• 10–15 degrees ATDC

An advantage of the Navistar's EcoMotors EM100 engine is that it has __________ fewer parts than an equivalent four-stroke cycle engine.

• 20%

• 30%

• 40%

• 50%

On- and off-highway vehicle emissions from the 1970s to present have been reduced by __________.

• 27%

• 13%

• 29%

• 39%

Technician A says hydrocarbon emissions are formed because of fuel that have been burned completely. Technician B says fuels are classified as hydrocarbons because they are made of mostly hydrogen and carbon atoms. Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

Which of the following statements about carbon monoxide is correct?

Select one:

• Carbon monoxide is created because of incomplete combustion of carbon-based fuels.

• Higher compression pressures and excess air used in diesel combustion limit carbon monoxide formation in diesels.

• Both A and B

• Neither A or B