Engine Performance 1 Chapter 65-1

Diesels do not need a throttle plate to control engine rpm, because fuel delivery is what controls engine rpm

• True

• False

The intake system ensures that _______ air is supplied to the engine, which is then mixed with fuel and burned in the combustionchamber, creating the thermal expansion that pushes the pistons down the cylinder.

• Clean

• Dry

• Both A and B

• Neither A nor B

The throttle plate on a diesel engine is designed to close off airflow to the engine to more easily introduce exhaust gases into the intakemanifold, thus _______ cylinder temperatures and _______ oxides of nitrogen.

• Raising; increasing

• Raising; reducing

• Lowering; reducing

• Lowering; increasing

The air cleaner is usually mounted away from the engine to obtain cleaner, warmer air.

• True

• False

In general, a _______ intake manifold produces high torque at _______ engine rpm because of the increased amount of time between the air pulses due to the inertia of the long column of air.

• Short; higher

• Long; lower

• Short; lower

• Long; higher

The use of plastic has enabled more efficient airflow into the engine due to smoother surfaces of the manifold and has allowed for easier shaping of the manifold, creating better airflow characteristics.

• True

• False

Tech A says that shorter intake manifolds produce higher torque at lower rpm. Tech B says that longer intake manifolds produce higher torque at high engine speeds. Who is correct?

• Tech A

• Tech B

• Both A and B

• Neither A nor B

The characteristic torque curve of a naturally aspirated engine depends mainly on how the engine's_​ pressure changes across the rpm operating range.

• Highest

• Median

• Mean

• Lowest

When pressure increases in an engine, cylinder temperature decreases.

• True

• False

Tech A states that power is produced when a mixture of air and fuel is burned inside an engine cylinder. Tech B states that if more air is forced into the cylinder, more power can be produced with each power stroke. Who is correct?

• Tech A

• Tech B

• both A and B

• neither A nor B because they dont know what they are talking about