302E Flashcards
The type of wire connection made by twisting two wires together is called?
A western union splice
T/F when using a DMM it is okay to pierce the insulation of the wiring
False
When repairing wires with non-insulated butt connectors, what should be done after the connection is crimped?
Once crimped, solder the splice and insulate it with shrink tubing
The most common fault that causes electrical circuit malfunction is?
The open fault
The troubleshooting process of finding specifically where the fault is located is called?
Isolating the electrical fault
What are the four steps to voltage drop testing?
Step one check source voltage
Step two check voltage drop across the load
Step three check voltage drop from positive side of the load to positive battery
Step four check negative side of the load to ground
All electrical schematics are drawn in a de-energized condition and all the electrical
components are drawn in the:
normal position.
List the five (5) components every machine’s electrical circuit must contain to be safe
and functional.
Every machine’s electrical circuit must have:
a) voltage source,
b) electrical conductors,
c) control device,
d) over current protection device and
e) load to be safe and functional.
Ohm’s Law is used in calculating values in electrical circuits. E is the symbol for
Electromotive force measured in volts (V), I is the symbol for Intensity of current
flow, measured in amperes (A) and R is the symbol for Resistance to current flow,
measured in ohms (Ω) What is the correct mathematical expression for Ohm’s Law?
a) E = I x R
b) I = E/R
c) R = E/I
all of the above
When you are troubleshooting a malfunctioning lighting circuit, you will use a
process of eliminating circuit components that are not causing a problem in order to
find the circuit component that is causing the problem. This process is called:
isolating the electrical failure.
High electrical resistances in electrical circuits will cause voltage drops. Voltage
drops that occur in equipment lighting systems will cause lamps to:
illuminate dimly.
Manufacturers develop and publish _____ _____ to guide you through troubleshooting procedures.
flow charts
The electrical resistance values of all the components in the ________electrical circuit add together to form the total resistance value of the circuit.
series
The current draw across each leg of a_________ electrical circuit add together to form the total current draw for the entire circuit.
paralle
_______ or _______ warning devices signal the operator of a potential problem or hazardous condition concerning various
machine operating conditions.
Audible or visual
