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ET ATT COMP TEST QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 100% CORRECT RATED A+, Exams of Electrical and Electronics Engineering

North Carolina A&T State University (NCAT)Electrical and Electronics Engineering

OSHA stands for: - ANSWEROccupational Safety and Health Administration Minimum amount of current to "freeze" the body to a conductor: - ANSWER12mA AC or 60mA DC Different Current Amounts vs the Body: - ANSWER1-5 mA: Faint tingling to slight shock 6-16 mA: Painful shock, shaky muscles 17-99 mA: Extreme pain, hard to let go, heart flutters begin 100-2000 mA: Heart flutters definite, severe muscle contractions, nerve damage, significant chance of death. 2000+ mA: Cardiac arrest, organ damage, severe burns, certain death. Electrical Burns - ANSWER

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ET ATT COMP TEST QUESTIONS AND
ANSWERS WITH VERIFIED SOLUTIONS
100% CORRECT RATED A+
OSHA stands for: - ANSWER✔✔Occupational Safety and Health Administration
Minimum amount of current to "freeze" the body to a conductor: -
ANSWER✔✔12mA AC or 60mA DC
Different Current Amounts vs the Body: - ANSWER✔✔1-5 mA: Faint tingling to
slight shock
6-16 mA: Painful shock, shaky muscles
17-99 mA: Extreme pain, hard to let go, heart flutters begin
100-2000 mA: Heart flutters definite, severe muscle contractions, nerve damage,
significant chance of death.
2000+ mA: Cardiac arrest, organ damage, severe burns, certain death.
Electrical Burns - ANSWER✔✔Most serious type of burn, results from current
flowing through tissue/bone.
Arc Burns - ANSWER✔✔Caused by high temperatures near the body. Can be
caused by arcs or explosions.
Thermal Contact Burns - ANSWER✔✔Results from contact with high temperature
surfaces.
The Law of Electrostatics States: - ANSWER✔✔Unlike charges attract and like
charges repel.
Power Resistor - ANSWER✔✔Used with large current flows, are also known as
"Wire Wound Resistors."
Precision Resistors - ANSWER✔✔Have a tolerance of 1% or less. Used when
exact resistance values are necessary.
Tolerance - ANSWER✔✔Measures the percent error of a resistor, the lower the
tolerance the more accurate a resistor's ohmic value.
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Download ET ATT COMP TEST QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 100% CORRECT RATED A+ and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

ET ATT COMP TEST QUESTIONS AND

ANSWERS WITH VERIFIED SOLUTIONS

100% CORRECT RATED A+

OSHA stands for: - ANSWER✔✔Occupational Safety and Health Administration Minimum amount of current to "freeze" the body to a conductor: - ANSWER✔✔12mA AC or 60mA DC Different Current Amounts vs the Body: - ANSWER✔✔ 1 - 5 mA: Faint tingling to slight shock 6 - 16 mA: Painful shock, shaky muscles 17 - 99 mA: Extreme pain, hard to let go, heart flutters begin 100 - 2000 mA: Heart flutters definite, severe muscle contractions, nerve damage, significant chance of death. 2000+ mA: Cardiac arrest, organ damage, severe burns, certain death. Electrical Burns - ANSWER✔✔Most serious type of burn, results from current flowing through tissue/bone. Arc Burns - ANSWER✔✔Caused by high temperatures near the body. Can be caused by arcs or explosions. Thermal Contact Burns - ANSWER✔✔Results from contact with high temperature surfaces. The Law of Electrostatics States: - ANSWER✔✔Unlike charges attract and like charges repel. Power Resistor - ANSWER✔✔Used with large current flows, are also known as "Wire Wound Resistors." Precision Resistors - ANSWER✔✔Have a tolerance of 1% or less. Used when exact resistance values are necessary. Tolerance - ANSWER✔✔Measures the percent error of a resistor, the lower the tolerance the more accurate a resistor's ohmic value.

Fuses - ANSWER✔✔Open when too much current melts them. Signals on a Schematic flow from: - ANSWER✔✔Left to Right. Inputs on the left, outputs on the right. The power supply on a schematic is usually at: - ANSWER✔✔The bottom left. All magnets possess: - ANSWER✔✔A North Pole A South Pole Flux Lines Flux Lines - ANSWER✔✔Lines that form a magnetic field around the magnet, moving from North to South outside the magnet. Permeability - ANSWER✔✔How easy it is to magnetize something, the willingness of a material to become magnetized. Retentivity - ANSWER✔✔How well a material can stay magnetic, ability of a material to retain magnetism. Ferrous Particles - ANSWER✔✔Ferrous means iron. A material without ferrous particles is NONMAGNETIC. Left Hand Rule - ANSWER✔✔A method for finding the north pole of an electromagnet. The thumb is the direction of the current, the fingers are the direction of the flux lines. Magnetomotive Force - ANSWER✔✔That force that creates the flux lines when current passes through a coiled conductor. Magnetic Circuit Breakers - ANSWER✔✔Open a circuit by generating a magnetic field when current flow becomes excessive. Multimeter Fun Facts! - ANSWER✔✔- Leads are not considered a functional area of the multimeter.

  • When measuring current, don't place/remove leads with the power on.
  • Never measure resistance with the power on.

Transformer Troubleshooting - ANSWER✔✔Open primary = No output secondary Open secondary = No output secondary Complete short secondary = No output secondary Partial short primary = Increase secondary voltage *partial opens do not exist Common Emitter - ANSWER✔✔- High power gain.

  • Assumed Amplification Value(Av) of 10.
  • Most commonly used for amplifiers.
  • Has a 180 degree phase shift. Common Base - ANSWER✔✔- High voltage gain(Assumed Av of 10).
  • No phase shift. Common Collector - ANSWER✔✔- High current gain, but low voltage gain(Assumed Av of 1).
  • No phase shift. Swamping Resistor - ANSWER✔✔A component in Transistor Amplifiers that reduces distortion caused by non-linear current changes. Sine Oscillators - ANSWER✔✔- Are transistor amplifiers with extra components that sample the output and return it as the input
  • Input and Output are in phase
  • Initial output is noise from amp circuit
  • Feedback circuit fixes noise Crystal Oscillator - ANSWER✔✔Use a crystal to determine oscillator frequency. Frequency should be stated on the crystal(no math necessary). LC Oscillator - ANSWER✔✔Uses an Inductor and Capacitor to make a tank circuit. RC Oscillator - ANSWER✔✔Uses resistors and capacitors to determine frequency.

Hartley Oscillator - ANSWER✔✔- An LC oscillator with two Inductors and a ground in between.

  • Changes the DC operating voltage to a sine wave AC output. AM Receiver Pipeline - ANSWER✔✔RF Input - > Tuner - > IF Amp - > Detector -

AF Amp - > Audio Output Tuner - ANSWER✔✔- Coverts the received Radio Frequency(RF) to Intermediate Frequency(IF)

  • Is made up of: tuning knob, RF Amplifier, Mixer, and Local Oscillator(LO) Tuning Knob - ANSWER✔✔Adjusts RF Amplifier RF Amplifier - ANSWER✔✔Selects and amplifies one of the incoming antenna frequencies LO(Local Oscillator) - ANSWER✔✔- Provides a frequency to mix with the selected RF signal.
  • LO frequency is set 455 kHz above original. Mixer - ANSWER✔✔Combines the LO and RF frequencies into 4 different variations:
  • RF
  • LO = RF + 455 kHz
  • Sum = LO + RF
  • Difference or IF = LO - RF(Will always be 455 kHz) IF Amplifier - ANSWER✔✔- Amplifies the IF frequency from the mixer.
  • Helps filter noise. Detector - ANSWER✔✔- Usually a made up of diode(rectifier) with some low pass filters(RC Circuit).
  • Detects and extracts the audio intelligence from the IF amplifier and passes the output audio to the AF Amplifier. AF Amplifier - ANSWER✔✔- A volume controlled amplifier that raises the power level of the audio signal to a value sufficient to drive the loudspeaker of the receiver.

Stepper Motor - ANSWER✔✔A digital incremental motor that uses digital pulses to position the shaft Synchro Motor - ANSWER✔✔An analog incremental motor that uses a specific magnitude of voltage to position the shaft Continuous motor - ANSWER✔✔- Motor where the shaft spins continuously

  • Can be AC or DC Counterelectromotive Force (CEMF) - ANSWER✔✔- The electromotive force (EMF) that is induced in the armature producing a current in the opposite direction. The induced EMF in a motor.
  • Increases as rpm increases Torque - ANSWER✔✔- A turning or twisting force that causes the shaft to rotate
  • Is inversely proportional to CEMF
  • Is measured in ft*lbs. Load(Rotating Machinery) - ANSWER✔✔Object that receives motor/generator output. Power - ANSWER✔✔- Rate at which work is done.
  • Measured in ft*lbs./s or Watts(W) Efficiency(Rotating Machinery) - ANSWER✔✔- The rating of how a motor changes power. % Efficiency = (Pout/Pin) * 100 Lenz's Law - ANSWER✔✔The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux. (Basically inertia but for motors and generators) Generators - ANSWER✔✔- Have a mechanical input and an electrical output.
  • There are AC and DC generators.
  • Operate on the principle of passing a conductor through a magnetic field. Coned and Cratered Contacts - ANSWER✔✔The only type of relay damage that can occur when current flows in one direction.

Burnishing Tool - ANSWER✔✔Tool used to clean relay contacts. Sealed Relays - ANSWER✔✔Can't be fixed. Replace when broken. Steps for Repairing Digital Systems - ANSWER✔✔1.) Fault detection 2.) Fault isolation 3.) Fault correction Most Common IC(integrated circuit) Faults - ANSWER✔✔- opens, shorts, faulty power supplies

  • internal IC faults make operation unpredictable Telltale Oil Filter - ANSWER✔✔Dry air system component that changes color to indicate an element change is required. Air-to-Air Cooling - ANSWER✔✔- Air moving past the heat-producing part absorbs the heat and is forced through a heat exchanger by an internal blower
  • Used in sealed enclosures Operational Amplifiers are made of: - ANSWER✔✔A Differential Amplifier, Common Collector Amplifier, and a Push-pull Amplifier