Formative Test - Thermodynamics

_____________ is a device specifically designed to convert heat energy into mechanical work.

In a steam turbine, how is heat used to do work?

• Heat is converted directly into mechanical energy.

• Heat is converted into electricity.

• Heat causes steam to expand and move turbine blades, producing mechanical work.

• Heat creates pressure that pushes against a piston to produce work.

Which among these play an important role in turning the turbine in a geothermal power plant?

• coal

• magnet

• electricity

• water

Which part of the world has the highest potential for geothermal energy production?

• polar regions

• volcanic regions

• coastal areas

• tropical rainforests

When a car engine burns fuel, what type of energy transformation occurs?

• chemical to mechanical energy

• mechanical to chemical energy

• thermal to mechanical energy

• mechanical to thermal energy

Which of the following statements is true regarding the conversion of heat into work?

• Heat always converts entirely into work.

• Some heat can be converted into work, but there will always be some waste heat.

• Work always converts entirely into heat.

• Heat and work are entirely separate forms of energy and do not convert into each other.

How can we increase the efficiency of machines?

• make use of efficient fuel

• make use of another machine to increase work output

• make use of generators to convert the lost energy

• make use of lubricant to reduce friction in machines