Thermodynamics Quiz

What is the main goal of a heat engine?

• Convert thermal energy into mechanical energy

• Convert mechanical energy into thermal energy

• Convert electrical energy into mechanical energy

• Convert mechanical energy into electrical energy

What is the function of the intake stroke in a heat engine?

• Ignite the compressed gas mixture

• Compress the gas

• Expel combusted air

• Pull in a mixture of air and fuel

What happens during the compression stroke in a heat engine?

• The gas is compressed and its temperature increases

• The gas is expelled from the engine

• The piston is pulled downward

• The spark plug fires

What is the purpose of the expansion stroke in a heat engine?

• Pull in a mixture of air and fuel

• Compress the gas

• Drive the piston downward

• Expel combusted air

What is the heat waste in a heat engine?

• Heat energy from the high temperature source

• Heat energy used for compression

• Heat energy from the low temperature reservoir

• Heat energy that doesn't get converted into work

How is the efficiency of a heat engine calculated?

• Work output divided by heat input

• Heat output multiplied by heat input

• Work output multiplied by heat input

• Heat output divided by work output

What is the efficiency of a heat engine that takes in 64,500 J of heat input and spits out 53,900 J of exhaust?

• 16.4%

• 25.0%

• 33.3%

• 50.0%

What is the main input to a heat engine?

• Electrical energy from a high temperature source

• Mechanical energy from a low temperature source

• Heat energy from a low temperature source

• Heat energy from a high temperature source

What is the main output of a heat engine?

• Heat input and work done

• Heat waste and mechanical energy

• Work done and mechanical energy

• Work done and heat waste

What is the purpose of a heat engine in converting thermal energy?

• Convert thermal energy into mechanical energy

• Convert mechanical energy into thermal energy

• Convert mechanical energy into electrical energy

• Convert electrical energy into mechanical energy