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Engineering 2 Exam
10 questions for the Engineering Exam
Question | Answer |
---|---|
What is the difference between temperature and heat? | Temperature is the measure of average energy in a substance (like hot or cold); Heat is the total molecular energy/total of thermal energy in a substance |
What law states that entropy will ALWAYS increase over time and is NEVER negative? | The 2nd law of Thermodynamics (Law of Entropy) |
What are the two types of latent heat? | Heat of Fusion, and Heat of Vaporization |
What are the basic parts of a hydraulic system? | They are the pump, the control system, and the actuator. |
Gases and liquids both classify as fluids, but what is the difference between a gas and a liquid? | Gases are COMPRESSIBLE; liquids are NOT |
When is a vacuum created? | When the air pressure is lower than the atmospheric pressure (Pa) |
What are the steps of the carnot cycle? | 1. Reversible isothermal expansion of a gas; 2. Reversible adiabetic expansion of a gas; 3. Reversible isothermal compression of a gas; 4. Isentropic expansion of a gas |
Is is true that the pressure in a closed system is equal in all directions? | True |
Why does the liquid in a closed system move forward when the pressure increases? | Air inside the closed system gets compressed and allows the liquid to move forward. |
How many Newtons are in Atmospheric Pressure? | There are 10,000 Newtons per square meter. |