Efficiency of a Heat Engine

An engine is a device that changes _________ energy in fuel to __________ energy.

• mechanical, chemical

• chemical, mechanical

• kinetic, chemical

• chemical, kinetic

The bore in which a piston operates is the ________.

• Block

• Head

• Cylinder

• Valve train

The engine part that slides back in forth in a cylinder is the _____________.

• Valve

• Piston

• Crankshaft

• Camshaft

Which is the correct order of events in an engine?

• Intake, Power, Compression, Exhaust

• Intake, Power, Exhaust, Compression

• Intake, Compression, Power, Exhaust

• Intake, Exhaust, Power, Compression

In a four stroke engine, gasoline must be mixed with the correct amount of _____________.

• Water

• Oil

• Carbon dioxide

• Air

Diesel engines use glow plugs to _______ the compressed air, causing it to combust.

• heat

• cool

• release

• compress

A _________ is the full travel of the piston, in either direction.

• revolution

• turn

• cycle

• stroke

If the change in internal energy is positive, does the temperature of the system increase or decrease?

• Increase
• Decrease

If an engine has a hot reservoir with a temperature of 980 K and cold reservoir of 673 K. Give the maximum efficiency of the engine rounded to the nearest tenth.

If a heat engine exhausts 360 J of energy after performing 180 J of work. How much energy was provided from the hot reservoir?