CET

What does the acronym ESD stand for?

Electrostatic Discharge

Current amounts between ______ and _____ can be lethal.

100mA, 200mA

What is the number one concern in regards to electrical safety?

Shock

Bohr's Atomic Model consists of what three components?

Protons, neutrons and electrons

Electrons are arranged in _____ around a nucleus.

shells

What are three types of materials used in electronics?

Conductors, semi-conductors and insulators

In the United States there are five common classifications of fires, which are:

A, B, C, D, K.

Coulomb's Law describes the forces of attraction or repulsion between electrical charges, which are ______________ to the product of the charges ______________ to the distance between them.

directly proportional, inversely proportional

The magnetic field that surrounds a magnet can best be described as invisible lines of force, and are commonly referred to as:

lines of flux.

An analog multimeter (AMM) checks for:

voltage, current and resistance.

An oscilloscope with two vertical inputs, is commonly referred to as a _______ oscilloscope.

dual-trace

Voltage or potential difference is the measure of potential energy between two points in a circuit and is commonly referred to as: 

voltage drop.

What is impedance?

The resistance of a component at a given frequency

A resistor has three color bands of red, brown and brown.  What is the ohmic value of this resistor?

210 Ohms

What components value is measured in millihenries?

Inductor

Ohm's Law characterizes the relationship between:

power, resistance, current and voltage.

Ohm’s Law states that resistance is calculated by voltage divided by current.  Using Ohms law, how do you determine power?

Voltage times current

Using a scientific calculator, a 3300 ohm resistor can be entered with scientific notation as:

3.3 * 10^3.

Total resistance in a series circuit equals:

the sum of all the resistor values within the circuit.

If a series circuit has three resistors valued at 10k Ohms, 15k Ohms and 20k Ohms, with a voltage source of 15V, the total current will be_____.

333.33uA

Current in a parallel circuit is:

inversely proportional to the circuits resistance.

With three 2.5k resistors and one 3.4k resistor in parallel, the total resistance is:

669.29 Ohms

With one series 8 Ohm resistor connected to two in-parallel resistors, 20 and 30 ohms respectively, what is the total resistance (Rt)?

20 Ohms

Given a battery rated at 350 ampere-hours how many hours will the battery be able to provide 7 amperes?

50

The basic properties associated with alternating voltage and current are:

frequency, period, wavelength and amplitude.

What is the calculated effective voltage for the wave form below?

𝑉𝑅𝑀𝑆=𝑉𝑝𝑒𝑎𝑘/2√

5.48V

What is the frequency of the sine wave below?
1/T

250Hz

In the illustration below, what component of the coaxial cable is letter “B”?

Dielectric

In an inductor/coil inductance varies as the _______ of the number of turns.

Square

What is the total inductance of the circuit below?

4.24H

Two basic uses for transformers are:

signal matching and power supplies.

What is meant by "transformer action"?

The transfer of energy from one circuit to another circuit by electromagnetic induction

What are the three basic parts of a transformer?

Primary winding, secondary winding and core

In the circuit below, what is the voltage output at letter “X”, when input voltage is 25V?

10V

The time required to charge a capacitor to 63 percent is known as:

a time constant.

Given the series capacitive circuit below, what is the total capacitance?

008uF

Calculate the capacitive reactance for 440 Hz and 9µF.

40.21 Ohms

In a resistive-capacitive circuit the vector line relationship shows two lines perpendicular to each other. What is the phase relationship?

90 degree

In a capacitive circuit, what is the voltage and current relationship?

Voltage lags

When the frequency of an applied voltage is increased the capacitive reactance of a circuit will:

decrease

What is the difference between calculating impedance for a series AC circuit and a parallel AC circuit?

A series impedance calculation is derived from resistance and reactance, while parallel impedance is calculated with resistive and reactive current divided into the source voltage

Each type of coaxial cable is designed with_____________, which is dependent on materials and dimensions used.

characteristic impedance

A coaxial cable's velocity of propagation factor depends on what two factors?

Dielectric constant and permeability

In a series resistive and reactive circuit what formula is used to find total impedance?

Z =sqrt( R2 + X2)

Silicon diodes have an approximate voltage drop of:

.7V

To properly bias the NPN transistor below, which voltages are correct?

E = -1; B = +1; C = +10

In regards to AWG standards, which gauge of wire has a bigger cross-sectional area?

16 AWG

Using ohm’s law for the circuit below, calculate the total power.

166.6 mW

In the circuit below, what is the calculated power for R3.

43.2W

In the circuit below, what is the current across R2?

2A

What is the voltage at terminal ‘A’ for the Wheatstone bridge below?

𝑉𝐵=𝑅3/𝑅1+𝑅3×𝑉𝑠

1.86V

What formula is used to properly calculate ‘Vout’ for the voltage divider below?

Vout = (R2/R2+R1) * Vin

In the circuit below, what is the value of R2?

Just skip

75.75 ohms

What is a primary advantage of a FET when compared to the bipolar transistor?

High input impedance

Zener diodes are designed to operate in the _____ bias region.

reverse

When compared to a JFET, the base of a bipolar transistor is similar to what element of the JFET?

Gate

A MOSFET is comprised of what four elements?

Gate, source, drain and substrate

How many PN junctions does a Unijunction transistor have?

One

Which bipolar transistor configuration has a current gain of less than 1?

Common base

A thyristor is a semiconductor with _____ layers that form ____ PN junctions.

4,3

When calculating power levels, which formula is correct?

dB=10*log(P1/P2)

If a signal decreases by 3 dB, how much power is lost?

50%

-3dBm is equal to how many milliwatts?

.5mW

The formula to calculate dBm from mW is:

10 log10( P / 1mW)

The split capacitors in a Colpitts oscillator provide:

regenerative feedback.

Why are crystal oscillators preferred over other types of oscillators?

When keeping frequency error or drift at a minimum is important

What is the resonant frequency for the circuit below?

75 kHz

Why is a differentiator used at the input of a flip-flop?

To produce a sharp spike

What is one way to minimize parasitic oscillations?

Place a swamping resistor across the transformer

In a class ‘C’collector:

collector current flows for less than one half cycle of the input signal.

What is the radix of the hexadecimal number system?

16

What is the hexadecimal equivalent of the decimal number 622?

26E

What is the decimal sum of 10010 and 11001?

43

What is the digital gate equivalent for the circuit below?

NOR

Which truth table is correct for the following logic diagram?

A

What does the acronym EAROM stand for?

Electrically Alterable Read Only Memory

What are three processor functions of a CPU?

Arithmetic logic, interfacing and control

If an oscilloscopes TIME/DIV is set at .2 microseconds, and the width of the pulse measured is at 8 divisions on the scope graticule, what is the pulse width?

1.6 microseconds

The coaxial cable leading to a cable TV is a 75 ohm transmission line. If you use 10Base2 coax cable for networking, that is a _____ ohm transmission line.

50

Why is flux used when soldering?

To prevent the formation of metal oxides at extreme temperatures

Lead and tin solder at a respective percentage of 63/37 melts at ______:

361o F.

What four methods are used in coupling amplifier stages?

Direct, RC, impedance and transformer coupling

What formula is used to calculate output voltage of a Difference operational amplifier?

Vout = (Rf/Rin)(V2 - V1)

Due to the configuration of the filtering components, the ability of a_____ type filter to remove ripple voltage is superior to that of either the _______ or ________ filter.

Pi, capacitive, inductive

What type of diagram shows electrical connections and functions of a specific circuit arrangement?

Schematic

Opening and closing vinyl envelopes used to carry work instructions, with 10-20% relative humidity, electro-static voltages can reach as high as:

7,000V

What is the modulus of a five-stage binary counter?

32

What is the preferred method for removing solder from a component attached to a circuit card assembly (CCA)?

Motorized vacuum extraction

To overcome noise, distortion and cost of maintenance in frequency division multiple systems, ________ systems were developed.

time-division multiplex

What does LEC stand for?

Local exchange carrier

Circuit switch networks maintain only _____ path(s) for the duration of the call.

one

What are the three fundamental types of wireless access technologies?

FDMA, CDMA and TDMA

In the kinescope, the ________ intensity of an electron beam from an electron gun is modulated in accordance with the ________ variations of signals received by a control electrode, or modulator.

current, amplitude

An electromagnetic wave is composed of an electromagnetic and electric field, which are at ______ from one another.

90 degrees

A vertically polarized antenna has a magnetic field that is at a _____ angle to the axis of the antenna.

90 degree

The 4-meter frequency band is also known as the _____ band.

70 MHz

In a common anode, seven-segment LED display, an individual LED will light if a negative voltage is applied to what element?

Cathode