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48 Cards in this Set

  • Front
  • Back
3-1A1

The product of the readings of an AC voltmeter and AC anmeter is called:
Apparent Power
3-1A2

What is the basic unit of electrical power?
Watt
3-1A3

What is the term used to express the amount of electrical energy stored in an electrostatic field?
Joules
3-1A4

What devices is used to store electrical energy in an electrostatic field?
Capacitor
3-1A5

What formula would determine the inductive reactance of a coil if frequency and coil inductance are known?
XL = 2f L
3-1A6

What is the term for the out-of-phase power associated with inductors and capacitors?
Reactive Power
3-2A1

What determines the strength of the magnetic field around a conductor?
The amount of current
3-2A2

What will produce a magentic field?
The current flowing through a conductor
3-2A3

When induced currents produce expanding magnetic fields around conductors in a direction the opposes the original magnetic field, this is known as?
Lenz's Law
3-2A4

The opposition to the creation of magnetic lines of force in a magnetic circuit is known as:
Reluctance
3-2A5

What is meant by the term "back EMF"?
A voltage that opposes the applied EMF
3-2A6

Permeability is defined as:
The ratio of magnetic flux density in a substance to the magnetizing force that produces it
3-3A1

What metal is usually employed as a sacrificial anode for corrosion control purpose?
Zinc bar
3-3A2

What is the relative dielectric constant for air?
1
3-3A3

Which metal object may be the least affected by the galvanic corrosion when submerged in seawater?
Stainless steel propeller shaft
3-3A4

Skin effect is the phenomenon where:
RF current flows in a thin layer of the conductor, closer to the surface, as frequency increases
3-3A5

Corrosion resulting from electric current flow between dissimilar metals is called:
Galvanic corrosion
3-3A6

Which of these will be most useful for insulation at UHF frquencies?
Mica.
3-4A1

What formula would calculate the total inductance of the inductors in series?
LT = L1 + L2
3-4A2

Good conductors with minimum resistance have what type of electrons?
Many free electrons
3-4A3

Which of the 4 groups of metals listed below are the best low-resistance conductors?
Gold, Silver, and Copper
3-4A4

What is the purpose of a bypass capacitor?
It removes alternating current by providing a low impedance path to ground
3-4A5

How would you calculate the total capacitance in parallel?
CT = C1 + C2 + C3
3-4A6

How might you reduce the inductance of an antenna coil?
Reduce the number of turns
3-5A1

What are the most commonly used specifications for a junction diode?
Maximum forward current and PIV (peak inverse voltage)
3-5A2

What limits the maximum forward current in a junction diode?
The juction temperature
3-5A3

MOSFETs are manufactured with THIS protective device built into gate to protect the device from static charge and excessive voltage:
Zener diode
3-5A4

What are the two basic types of junction field-effect transistors?
N-channel and P-channel
3-5A5

A common emitter amplifier has:
More voltage gain than a common collector
3-5A6

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?
An FET has high input impedance; a bipolar transistor has low input impedance
3-6A1

An AC anmeter indicates:
Effective (RMS) values of current
3-6A2

By what factor must the voltage of an AC circuit, as indictated on the scale of an AC voltmeter, be multiplied to obtain the peak voltage value?
1.414
3-6A3

What is the RMS voltage at a common household electrical power outlet?
117-V AC
3-6A4

What is the easiest voltage amplitude to measure by viewing a pure sine wave signal on an oscilloscope?
Peak-to-peak
3-6A5

By what factor must the voltage measured in an AC circuit, as indicated on the scale of an AC voltmeter, be multiplied to obtain the average voltage value?
0.9
3-6A6

What is the peak voltage at a common household electrical outlet?
165.5 volts
3-7A1

What is a sine wave?
A wave whose amplitude at any given instant can be represented by the projection of a point on a wheel rotating at a uniform speed
3-7A2

How many degrees are there in one complete sine wave cycle?
360 degrees
3-7A3

What type of wave is made up of sine waves of the functional frequency and all the odd harmonics?
Square
3-7A4

What is the description of a square wave?
A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time
3-7A5

What type of wave is made up of sine waves at the fundamental frequency and all the harmonics?
Sawtooth wave
3-7A6

What type of wave is characterized by a rise time significantly faster than the fall time (or vise versa)?
Sawtooth wave
3-8A1

What term is used to identify an AC voltage that would cause the same heating in a resistor as a corresponding value of DC voltage?
Root mean square (RMS)
3-8A2

What happens to reactive power in a circuit that has both inductors and capacitors?
It alternates between magnetic and electric fields and is not dissipated
3-8A3

Halving the cross-sectional area of a conductor will:
Double the resistance
3-8A4

Which of the following groups is correct for listing common materials in order of descending conductivity?
Silver, copper, aluminum, iron, and lead
3-8A5

How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?
Multiply apparent power times the power factor
3-8A6

Assuming a power source to have a fixed value of internal resistance, maximum power will be transferred to the load when:
The load impedance equals the internal impedance of the source