Industrial Electronics

Specific Competencies and Skills Tested in this Assessment:

DC Electricity

Demonstrate the ability to identify and use the principles of the following:

• Ohm’s Law
• Kirchhoff’s Law
• Watt’s Law
• Series, parallel, series-parallel
• Capacitance
• Inductance
• Voltage cells
• Schematic symbols
• Time constants

AC Circuits

Demonstrate the ability to identify and use the principles of the following:     

• Transformer action
• Resonance
• Voltage conversion (RMS, peak, etc.)
• Waveform analysis
• Degrees of displacement
• Reactance
• Impedance
• Filters
• Power factor
• Time/frequency

Fundamentals (covered in the performance test)

Demonstrate the ability to identify and use the principles of the following:

• Component identification
• Circuit characteristics
• Wiring specifications
• Circuit protection

Test Equipment

Demonstrate the ability to identify and use the principles of the following:

• Meter fundamentals
• Oscilloscope operation
• Digital meters
• Milliohm meter
• Transfer curve tracer
• IC analyzer
• Logic probe/pulser probe

Semiconductors

Demonstrate the ability to identify and use the principles of the following:

• Diode fundamentals (bipolar-zener applications)
• Transistor fundamentals
• Field effect transistor (FET) fundamentals

Electronic Circuits

Demonstrate the ability to identify and use the principles of the following:

• Transistor amplifier fundamentals
• Operational amplifier fundamentals
• Differentiator/integrator op-amps circuits
• Voltage regulators
• 555 Timers
• Power supplies
• Oscillators
• Phase-lock loop circuits

Digital/Micro

Demonstrate the ability to identify and use the principles of the following:

• Basic gates
• Boolean expression
• Gate circuits
• Logic specifications
• Circuit identification
• Counter circuits
• Microprocessor fundamentals
• Latches/flip-flops
• Binary numbering systems

Digital/Micro, continued

• Discrete gates
• D/A, A/D
• Multiplexers/demultiplexers

Transducers

Demonstrate the ability to identify and use the principles of the following:

• Thermistors
• Resistive temperature detectors (RTDs)
• Optical devices
• Thermocouples
• Proximity and resistive devices

Ladder Logic and Motors

Demonstrate the ability to identify and use the principles of the following:

• DC motors
• Synchro-systems
• AC induction motors
• Horsepower ratings
• Three-phase power
• Motor starter circuits
• Ladder diagrams
• JIC symbols

Safety

Demonstrate the ability to use principles of safety for the following:

• Personal/ shop/equipment

Programmable Logic Controllers

Demonstrate the ability to identify and use the principles of the following:

• PLC programming (ladder logic)
• PLC input/output capabilities
• PLC field wiring
• PLC trouble shooting



Written Assessment:

Administration Time: 3 hours
Number of Questions: 197

Areas Covered:

DC Electricity: 13%

AC Circuits: 13%

Test Equipment: 10%

Electrical Drawings: 13%

Digital/Macro: 13%

Transducer: 5%

Ladder Logic and Motors: 5%

Safety: 10%

Programmable Logic Controllers (PLC): 5%

Sample Questions:

A positive ion is produced when an atom

1. loses an electron
2. loses a proton
3. gains an electron
4. gains a proton

If a transformer with a 1:5 ratio is rated at 500 volt-amperes and has an input voltage of 100 volts, what would be the output current assuming 100 percent efficiency?

1. 1.0 amp
2. 2.5 amps
3. 5 amps
4. 25 amps

To remove a DC offset from the output of a frequency generator connected to a test circuit, the technician must

1. change the DC bias on the test circuit
2. place at capacitor in series with the output of the generator and the test circuit
3. change the scope probe setting to times 10
4. set the scope to measure AC

The junction field effect transistor (JFET) operates in the ___________ mode.

1. depletion                 
2. enhancement         
3. depletion or enhancement             
4. depletion and enhancement               

A 4-input NOR gate has how many possible input conditions?

1. 2
2. 4
3. 8
4. 16

Two 40-microfarad capacitors rated at 150 volts each, connected in series, would have a combined rating of

1. 20 microfarads at 150 volts
2. 20 microfarads at 300 volts
3. 80 microfarads at 300 volts
4. 80 microfarads at 150 volts

Inductance is the electrical property that

1. opposes DC more than AC
2. converts electricity into heat
3. opposes changes in current
4. opposes changes in voltage

The DIAC is also known as a

1. unilateral switch
2. bilateral switch
3. Zener diode
4. blocking oscillator

An SCR is basically a

1. silicon transistor with a base, emitter, and collector
2. PNPN device with four leads attached to the four layers
3. PNPN device with a gate, cathode, and anode leads
4. three layer device with a gate, base, and anode

A transducer is a device that

1. conveys a process variable from one point to another
2. transmits a signal from a sensing element to an instrument
3. converts low mechanical power to a higher level of power
4. converts one form of energy into another

Performance Assessment:

Administration Time: 3 hours
Number of Jobs: 7

Areas Covered:

14% Semiconductor Testing
Identification of components; determination of component quality and lead configuration; use of test equipment, and time to complete Job 1.

14% Soldering/De-soldering
Techniques for soldering and de-soldering components; choice, preparation and use of tools and equipment; safety, and time to complete Job 2.

14% Test Equipment
Use of meters; measurement of voltage, resistance, current; use of schematic, and time to complete Job 3.

14% Circuit Construction
Principles of AC and DC electricity; use of schematics; assembly procedures and techniques; component selection; safety, and time to complete Job 4.

16% Oscilloscope Usage
Use and care of equipment; calibration procedures; AC and DC measurements; interpretation of waveforms; use of schematics, and time to complete Job 5.

14% Troubleshooting
Problem diagnosis; identification of components (satisfactory or defective); use of test equipment; procedures and techniques for restoring circuit operation, and time to complete Job 6.

14% Digital/Micro
Application of gate logic; gate substitution; use of diagram; circuit construction; creation of truth table; observation techniques, and time to complete Job 7.   Sample Job: Test Equipment

Maximum Time:  25 minutes
Participant Activity:  The participant will measure the voltage drop, the current and the resistance for each resistor.  Then the total voltage, current and resistance will be measured for the entire circuit.