FE Prep

Nyquist Frequency

The highest recordable frequency within a signal.

Nyquist’s Sampling Theorem

To reconstruct the analog signal from the discrete sample points, the sample rate must be larger than twice the highest frequency in the measured signal.

Sampling Frequency (Formula)

Biot Number

The ratio of heat transfer resistances inside of and at the surface of the body.

Biot Number (Formula)

Froude Number

The ratio of inertial forces to gravity forces for fluid flow.

Froude Number (Formula)

What is the Froude Number often used for?

To measure how fast water is moving relative to how fast it could move given channel dimensions.

What is the gravitational constant g_c in SI units?

1

Stagnation Temperature

The temperature a moving fluid would reach if it stopped, and all kinetic energy changed to heat without any losses.

Superposition

A method to calculate all stresses in a structure when the structure is subject to multiple types of stresses such as axial, torsional, shear, bending, etc.

Combined loading structure results in elements on the surface and within that undergo normal and shear stresses acting on faces of element.

What is the time constant formula for a RC circuit?

Tau = R*C

Which of the following are power fault limiting devices?

Select which one best applies.

Book Value

Purchase price - Accumulated depreciation

For MACRS does the final year of depreciation get calculated or are the depreciation per year added together?

They should be added together.

So at year 3 the depreciation is: (Dj for year 1+Dj for year 2+Dj for year 3)

Passive Transducer

Requires external power to convert measured physical parameter into an output electrical signal.

Active Transducer

Converts measured physical parameter into an output electrical signal without external power.

Which is the order of a proper control system?

The highest power of s present in the denominator of the transfer function of the system.

How does metal corrosion occur?

There must be an anode and cathode in electrical contact in the presence of an electrolyte.

Dry Bulb Temperature

The temperature of a vapor free gas mixture as ordinarily determined by immersion of thermometer within mixture.