Grounding and Shielding of Instrumentation Wiring (12306-16)

The statement, "a conducting connection between an electrical circuit or equipment and the earth" defines which of the following terms?

Ground

The permanent joining of metallic parts to form an electrically conductive path that will safely conduct an imposed current is called

Bonding

If a grounding ring is used as a grounding electrode, it must consist of at least 20 (6 m) of bare copper conductor no

smaller than 2 AWG

An equipment grounding conductor is intended to carry

fault current

When metal conduit and enclosures are used, the conduit itself is the grounding means if the conduit provides an uninterrupted path back to the

service entrance

What type of noise is present between the line and ground or neutral and ground but not between each line?

Common-mode noise

What type of noise can be created by running AC power lines parallel to signal leads?

Capacitive-coupled noise

In the left-hand rule, the direction the thumb points represents the

direction of electron current flow

Which of these is generally the most difficult kind of circuit noise to locate?

Ground loop noise

Signal noise that can be produced due to current leakage is

directly coupled noise

One common method to combat EMI is to shield power, control, and

signal cables entering and leaving an assembly

Too many ground points in a shielded cable can cause

a ground loop

The tensile strength of aluminum foil is

poor

One advantage to using aluminum foil shields is that they

are excellent low-frequency electrostatic shields

To protect analog instrumentation against high-frequency noise, a second ______ must be used.

External Shield