Questions and Answers
Define enthalpy.
Total energy of a system.
Which of the following is true of the electric field intensity about an isolated point charge?
As a professional engineer originally licensed 30 years ago, you are asked to evaluate a newly developed computerized control system for a public transportation system. You may accept this project if:
The SI system uses (1) for mass and (2) for weight (force).
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Mass is a constant property of an object where __________ varies with gravitational field.
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What is a metric ton?
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What is a kip?
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What basic SI unit is equal to kg*m^2/s^2?
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Which of the following is false for an identity matrix, I?
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Which of the following statements is true for a power series with the general term a_ix^i?
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What is the oxidation number for chromium (Cr) in the compound BaCrO4?
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Uranium-235 and uranium-238 have the same number of which of the following?
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Which of the following is a homogeneous mixture?
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The activity of decay particles of a radioactive isotope depends on?
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The term 'divalent' means:
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Study Notes
Key Definitions and Concepts
- Enthalpy: Total energy of a system, including internal energy and energy due to pressure and volume changes.
- Electric Field Intensity: For an isolated point charge, it varies inversely as the square of the distance to the charge, indicating that strength decreases with distance.
- Professional Engineer Competence: Engineers may accept projects in areas where they are competent; past specialization alone is insufficient without current knowledge.
- SI Units: Mass is measured in kilograms; weight (force) is measured in newtons, reflecting gravitational force.
- Mass vs. Weight: Mass remains constant regardless of location, whereas weight varies with gravitational field intensity.
- Metric Ton: Equivalent to 1000 kilograms; also referred to as a tonne.
- Kip: A unit of force equal to 1000 pounds; commonly used in engineering contexts.
- Kinetic Energy Units: Measured in joules, represented mathematically as (1/2)mv², where m is mass and v is velocity.
Matrix Properties
- Identity Matrix: An identity matrix is square; all diagonal entries are 1, while all other entries are 0. The property AI = A (not AI = A⁻¹) defines it.
Oxidation and Chemical Reactions
- Oxidation Numbers: In BaCrO4, chromium (Cr) has an oxidation number of +6 due to balancing charges with barium and oxygen. Understanding oxidation states is crucial in redox reactions.
- Isotopes of Uranium: Uranium-235 and uranium-238 both contain 92 protons and electrons, differing in the number of neutrons.
Mixtures and Homogeneity
- Homogeneous Mixture: A well-dispersed mixture where components are not distinguishable, such as a strawberry milkshake. Seawater and sodium chloride are chemically combined, not mechanically, thus differ from mechanical mixtures.
Radioactivity and Decay
- Radioactive Isotope Activity: The decay activity of a radioactive isotope is proportional to its mass (amount of isotope remaining) and independent of environmental factors like temperature and pressure.
Ion Properties
- Divalent Ions: Refers to ions that have an oxidation number of +2. Understanding oxidation states is crucial for identifying the behavior of ions in reactions.
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Test your knowledge with these flashcards on key concepts in electrical engineering, including enthalpy and electric field intensity. Perfect for exam prep, these cards cover essential definitions and principles directly related to the FE Electrical Exam.
