Digital Electronics Unit 1.1.1

Your partner has been working on your group's circuit and has left the work area. Before you begin working on the circuit what should you do to ensure that the circuit is not active and prevent yourself from getting a shock?

• Disconnect the power source.

• Measure the circuit with an ohmmeter for resistance.

• Check the circuit with a continuity tester.

• Use a voltmeter to measure voltage at the power source.

You used a tool and it inadvertently becomes damaged.  What should you do next?

• Continue to use the tool as long as it still somewhat works.

• Label the tool that is broken and inform the instructor.

• Throw the tool away.

• Put the tool away and find another tool to use.

If you have not been given instruction on a tool or piece of equipment in the laboratory, you should:

• a. Not use the tool until you have had proper instruction.

• b. Use it anyway if you think you can figure it out.

• c. Ask a classmate how to use it.

• d. Have another classmate (who also has not had instruction) do it for you.

Which of the following is appropriate for working in an electronics workspace?

• Wearing multiple rings on your fingers.

• Wearing an oversized, baggy hooded sweatshirt.

• Clothing that is not loose and no jewelry.

• Dragging your feet on the carpet and shocking your friends.

Chemicals can be used to etch circuit board. Which of the following should be done before using the chemicals in an electronics classroom?

• Read all instructions that come with the chemical.

• Read the Material Safety Data Sheet to prepare for emergencies.

• Wear goggles and a lab coat to protect from potential spills.

• All of the above.

What is the maximum current level that a human body can withstand before sustaining injury?

• 100 uA

• 1.0 mA

• 15 mA

• 50 mA

A large voltage is applied to a circuit and a fire is started on a circuit board in the lab. When you inform your instructor, which of the following should the instructor use to extinguish an electrical fire?

• Water.

• Class A fire extinguisher.

• Class B fire extinguisher.

• Class C fire extinguisher.

Before working with a chemical or solder, a student obtained a Material Safety Data Sheet.  Which of the following will the student find on this document?

• What the chemical is made of.

• The first aid procedure that you should follow.

• How to handle the material.

• All of the above

Which of the following is the appropriate scenario for wearing safety glasses in an electronics classroom?

• a. Safety glasses or goggles should be worn to prevent eye injuries from chemicals that splash.

• b. Safety glasses or goggles should be worn when using tools that may cause objects to be thrown.

• c. Safety glasses or goggles should be used when soldering components.

• d. All of the above.

Why should the students not rush? Why should students take their time when working in an electronics classroom?

• a. Taking your time allows you to double check your connections and to reduce the need for troubleshooting later.

• b. Taking your time allows you to create your circuits more neatly. This allows you to pick up where you left of last time more easily.

• c. Taking your time allows you to double check all part numbers and values. A common error.

• d. All of the above.