Heat Engines

What happens during the compression stroke of a four-stroke engine?

• The piston compresses the air-fuel mixture in the cylinder.

• The spark plug ignites the air-fuel mixture in the cylinder.

• The exhaust valves open to release gases from the cylinder.

• The piston expands the air-fuel mixture in the cylinder.

Tags

NGSS.MS-PS1-4

What do you think is the effect of this exhaust gas to the environment?

• It will constitute to air pollution

• It will improve air quality

• It has no effect

• It will cause rain

Tags

NGSS.MS-ESS3-4

What are the four main strokes of a four-stroke engine (in correct order)?

• Intake, Compression, Combustion, Exhaust

• 
  Intake, Compression, Exhaust, Ignition

• Intake, Combustion, Power, Exhaust

• 
  Intake, Compression, Power, Cooling

A heat engine ___.

• changes mechanical energy to thermal energy

• changes mechanical energy into electrical energy

• changes thermal energy into mechanical energy

• changes kinetic energy into thermal energy

Tags

NGSS.HS-PS3-3

Gasoline engines and diesel engines are ___.

• insulators

• external combustion engines

• internal combustion engines

• heat movers

Tags

NGSS.MS-PS3-5

A machine that converts thermal energy into mechanical energy.

• heat engine

• refrigerator

• compressor

• thermostat

Tags

NGSS.HS-PS3-4

Most cars use a type of machine that coverts thermal energy into mechanical energy to move.

• Heat engine

• Heating appliance

• Refrigerator

• Thermostat

Tags

NGSS.MS-PS3-3

______ engine, such as those found in moving vehicles and lawn mowers, converts thermal energy into mechanical energy.

• compressor

• bimetallic coil

• temperature furnace

• internal combustion

In the bottom of the refrigerator, there is a(n) _______ that forces the coolant into a smaller space, which increases the thermal energy of the coolant.

• compressor

• bimetallic coil

• temperature furnace

• internal combustion

Tags

NGSS.MS-PS3-3

In a car engine, a spark ignites a fuel-air mixture, which ______ and pushes a piston down; this motion turns the crankshaft—the mechanical energy that moves the car.

• contracts

• expands

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5