Electrical Engineering Pre-Review Exam #1 Flashcards

Vocabulary-style flashcards derived from the Electrical Engineering Pre-Review Exam #1, covering protective devices, Philippine Electrical Code standards, engineering materials, and thermodynamic principles.

Differential relay

Protective relays that operate on the principle that the current entering and the current leaving a section are equal normally but unequal when fault develops within the section.

Phase angle meter

An ac device used to measure the angle between the voltage and its current.

Point of contraflexure

The point in which the bending moment changes sign through a zero value.

Coke

What is a coal that has been previously burned in an oxygen-poor environment?

Entropy

The measure of randomness or disorder in a system.

Annuity

A series of uniform amounts over a period of time.

Steiner’s theorem

The parallel axis theorem for second moment of area.

Yellow alert

A notice issued by the System Operator when a tropical disturbance is expected to make a landfall within $24$ hours.

Base load plants

Plants designed to supply power at high capital cost and low operating cost.

White iron

A type of cast iron that is hard and wear resistant.

Phosphorus

The most undesirable of all the elements commonly found in steels.

Open circuit test

A test conducted on transformers to determine core losses.

Critical path method

A network model that enables engineer managers to schedule, monitor, and control large and complex projects by using only one time factor per activity.

Device number $51$

The device number for AC time delay overcurrent relay.

Contestable customer

A customer with a demand of at least $1\,MW$ as specified by the Energy Regulatory Commission.

Pascal’s Law

The law stating that for a confined fluid, the pressure at a point has the same magnitude in all directions.

Annuity due

A type of annuity where the payments are made at the start of each period, beginning from the first period.

Curie point

The temperature at which ferromagnetic materials can no longer be magnetized by outside forces.

Lenz’s law

The law stating that at every instant the direction of secondary current in a transformer must be such as to oppose any change in flux.

Latus rectum

In an ellipse, a chord which contains a focus and is in a line perpendicular to the major axis.

Liquidity

The ability to convert assets to cash quickly.

Foreign Reciprocity

The term used when an American citizen is allowed to practice their electrical engineering profession in the Philippines.

Adiabatic process

A process where no heat is transferred.

EPIRA

Republic Act No. $9136$.

Device number $87$

The device number for differential protective relay.

Market value

The amount that a willing buyer will pay to a willing seller for a property where each has equal advantage and is under no compulsion to buy and sell.

Parabola

The conic section having an eccentricity equal to $1$.

ACSR

Aluminum Conductor Steel Reinforced.

Short circuit resistance

The resistance value of a short circuit, which is $0$.

Transformer primary-secondary resistance

The expected resistance between the primary and secondary windings, which is infinity.