module 9

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

Which of the following is used to determine engine size (displacement)?

Cylinder bore, piston stroke, and number of cylinders.

A circle equals 180 degrees.

F

An engine in which the bore is larger than the stroke is an undersquare engine.

F

A larger bore and stroke makes the engine more powerful.

T

Compression ratio is a comparison of cylinder volumes at BDC and TDC

T

Compression stroke pressure is an indicator of engine condition.

T

Engine displacement is the piston displacement times the number of cylinders in the engine.

T

Technician A says as altitude above sea level increases, more air is forced into a normally aspirated engine. Technician B says as altitude above sea level increases, atmospheric pressure decreases. Who is right?

b only

Technician A says that horsepower is actually a measurement of torque. Technician B says that horsepower ratings are used in the United States. Who is right?

b only

Technician A says that horsepower varies with engine speed. Technician B says that torque varies with engine speed. Who is right?

both a and b

Technician A says that piston movement on the intake stroke creates vacuum. Technician B says that manifold vacuum can be used to diagnose some engine problems. Who is right?

both a and b

Torque is measured at the engine ____.

crankshaft

All of the following are measures of engine displacement, except:

cubic millimeters

Piston protrusion is a critical measurement on ____ engines

diesel

Brake horsepower is measured at the ____.

engine crankshaft

turning force, torque cylinder diameter, bore a measure of engine power killowats total piston travel. stroke negative pressure. vacuum

k

When the piston in a given engine is at BDC, the cylinder volume is 30 cubic inches. When this piston reaches TDC, the cylinder volume is 5 cubic inches. What is the compression ratio of this engine?

maybe 6:1

Technician A says, generally speaking, a diesel engine has lower compression than a gasoline engine. Technician B says that lower compression ratios reduce power. Who is right?

maybe b

Piston displacement is a measure of ____.

volume


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