Chapter 14 Review questions

1. Describe the AWG wire guage system and compare it to the metric system.

A1.  In the AWG system, as the guage number increases, the size of the conductor wire decreases. 
Therefore, a 14 guage wire is smaller than a 10 guage wire. The metric system gives the size of the 
wire in mm squared. 0.5mm squared is equal to 20 guage wire, 52.0mm squared wire is equal to 0 guage
wire.



2.  Explain the diference between a terminal and a connector.

A2.  A terminal is a metal fastener attached to the end of a wire. A connector usually refers to the 
plastic portion that snaps or connects together.



3.  Discuss how fuses, PTC circuit protectors, circuit breakers, and fusible links protect a circuit.

A3.  Fuses are constructed of a fine tin conductor inside a glass, plastic, or ceramic housing. The tin
is designed to melt and open the circuit if excessive current flows through the fuse. PTC's are installed
in series in the circuit being protected. If excessive current flows, the temperature and resistance of 
the PTC increases. This increases resistance reduces current flow (amperes) and may cause the electrical
component in the circuit not to function correctly. Circuit breakers are mechanical units made of two
different metals that deform when heated and open a set of contact points that work in the same manner 
as an off switch.



4.  Describe how to perform a wire repair.

A4.  One method of repairng a wire is using a crimp and seal connector. Step 1, Strip the insulation 
from the ends of the wire (about 8mm). Step 2, Select the proper size of crimp and seal connector for 
the guage  of wire being repaired. Insert the wires into the splice sleeve and crimp. Step 3, apply heat 
to the connector until the sleeve shrinks down around the wire and a small amount of sealant is observed
around the ends of the sleeve.



5.  Describe how to locate a short curcuit using a Gauss guage.

A5.  If a short circuit blows a fuse, a special pulsing circuit breaker can be installed in the circuit 
in place of the fuse. Current will flow through the circuit  until the circuit breaker opens the circuit,
as soon as the breaker opens the circuit it closes again. This on and off current flow creates a pulsing
magnetic field around the wire carrying the current. A Gauss guage will observe this magnetic field, 
allowing you to pinpoint the short.



Red seal questions

1. The high the AWG number

A1     A - the smaller the wire


2.  Metric wire size is measured in units of 

A2   C - square millimeters


3.  Which statement is true about fuse ratings?

A3   B - The lead strip in a fuse melts with excessive current.


4. Which statements are about wire, terminals and connectors.

A4.   B - A connector is usually a plastic piece where terminals lock in.



5.  This type of solder that should be used for electrical work is 

A5.   A.  Rosin core 



6.  On a wiring diagram, S-110 with a ".8 BRN/BLK" means

A6.    C - A splice of brown with black stripe, wire size being 0.8  square millimeters



7.  A high impedance digital meter is neccessary to measure electronic circuits because

A7.  C  - wil not interfere with the electronic circuit due to its high internal resistance



8.  A voltmeter is

A8.  A - connected to a circuit in parallel



9.  An ohm meter 

A9.  C - Requires that the circuit be disconnected from a power source before connecting



10.  An ammeter

A10.   B -  connected in series.