Industrial Automation Checkpoints 1-10 review.

Which type of diagram helps when troubleshooting because it shows the logical path to take to solve a problem?

Flow chart

Which type of diagram shows physical details of an object, such as its length and height, as seen by the eye?

Pictorial Diagram

Which type of diagram uses symbols and interconnecting lines to show how components in an electronic circuit are connected?

Schematic Diagram

Which type of diagram shows the logic of an electrical circuit, with components drawn on horizontal lines between two vertical power lines?

Ladder Diagram

What are the five parts of a basic electrical circuit?

A load, Source of electricity, Conductors, Control devices, and circuit protection

What are the two basic types of circuit protection devices?

Breakers and Fuses

In electrical switches, what do the abbreviations NO and NC stand for?

Normally open and Normally Closed

What electrical device is used to turn a motor on and off and includes overload protection?

Motor Starter

What electrical device converts electrical energy into a linear mechanical force?

Solenoid

What are the two basic types of contactors?

Heating Contactors and Lighting Contactors

Are double-insulated power tools required to have a plug with a grounding connection?

No

Before and after using any test instrument, what important step should be taken?

Make sure the instrument isn't damaged in any way, and verify calibration

What is the only way to ensure that power is OFF in a system, circuit, or equipment?

By taking proper measurements

What does the 5S organization system stand for?

Sort, Straighten, Shine, standardize, and sustain

What type of test instrument is used to test for a complete path for current flow without displaying an actual numerical value?

Continuity Tester

What type of test instrument is used to give an approximate voltage level and type without displaying an actual numerical value?

Voltage tester

When testing a receptacle, is the hot slot the long slot or the short slot?

Short Slot

On a DMM, is the displayed digital measurement or the displayed bar graph updated the fastest?

Bar graph

What CAT rating is required for a test instrument used outdoors?

Cat IV

When testing fuses in a disconnect where the meter leads are on top of two good fuses and read 230 VAC, what should the meter read when one lead is moved to the bottom of a fuse?

230 Vac

What type of current measurement should never be taken on a circuit that may contain high or unknown currents?

In-Line current Measurement

What type of test instrument shows a visual display of the measured value?

Ossiloscope

What type of test instrument is used to test "1" and "0" states in electronic circuits?

Digital Logic Probes

What type of test instrument is used to test the condition of a conductor's or equipment's insulation?

Meghometer

When using a ground resistance tester, what is the maximum building resistance required by the NEC for safe system operation?

25ohms

What test instrument is used to ensure that three-phase power lines (A, B, and C) are all present and in the right order (ABC)?

Phase Sequence Indicator

Can an infrared temperature meter be used to take temperature measurements on an energized circuit?

Yes

What type of test instrument is used to test fiber optic cables for potential problems?

OTDR

What are four factors that affect the severity of an electrical shock on a person?

The amount of current flow, the length of time the body is exposed to the current flow, the path the electricity takes through the body, and the physical size and condition of the body

When a safety sign or label indicates "ESD PROTECTED AREA," what does ESD stand for?

Electrostatic Discharge

Which safety label indicates an imminently hazardous situation that if not avoided results in death or serious injury?

DANGER Label

What 2 types of motor protection protect the motor when starting and running?

Overload protection and Overcurrent Protection

Except in an emergency, who is allowed to remove a lockout and/or tagout device?

The individual who placed the lockout device or the individual's immediate supervisor after verifying that removing it will not endanger anyone

At what voltage level do NFPA 70E requirements apply to energized electrical conductors or circuit parts?

50 volts or more or where electrical hazards exist

What 3 requirements must arc-rated clothing meet?

Must not ignite or continue to burn, must provide an insulating value to dissipate heat away from the skin, must provide resistance to the break open forces generated by the shockwave of an arc

Building and equipment grounding systems must have a resistance of less than how many ohms?

25 Ohms or less

How much current imbalance does it take to trip a GFCI?

5mA

What class of fire are electrical fires rated?

Class C Fires

In a hazardous location, what class is combustible dust or grain rated?

Class 2

What is the typical percentage of oxygen in the air?

21%

What are the dangers of confined spaces?

Limited movement, oxygen deficiency, combustible gasses, and toxic gasses

Do all overhead powerlines have an insulated conductor coating?

No, only those under 600 volts

If line voltage exceeds 50kV, what is the minimum overhead clearance?

10 feet plus an extra 4 inches for every 10kv above 50kv

How many loads can be connected in series per line in a control circuit in which a switch is used to control the loads?

1

How many loads can be connected in parallel per line in a control circuit in which a switch is used to control the loads?

One for each line

Why are numerical cross-reference numbers added to a control circuit?

Numerical cross reference systems are used to easily read the action of a complex line diagram

Why are wire reference numbers added to a control circuit?

To trace and keep track of wires easier. Also helps identify wires

Why are manufacturers' terminal numbers added to a control circuit?

To separate each part from one another

Why are numbers added to a control circuit?

To simplify and make the circuit easier to understand

Name the circuit signals used in the signal section of the circuit in Figure 5-7

Pressure switch, Push button, Temperature switch and Foot switch

Name the circuit loads used in the action section of the circuit in Figure 5-7

Pilot light and Solenoid

Name the circuit control logic used in the decision section of the circuit in Figure 5-7

OR logic and then AND logic

What type of circuit logic is developed when two NO switches are connected in parallel?

OR

What type of circuit logic is developed when two NC switches are connected in parallel?

NAND

What type of circuit logic is developed when two NO switches are connected in series?

AND

What type of circuit logic is developed when two NC switches are connected in series?

NOR

When additional switches are wired into a control circuit to produce additional STOP functions, are NO or NC contacts used and are they connected in series or parallel?

Normally closed, connected in series

When additional switches are wired into a control circuit to produce additional START functions, are NO or NC contacts used and are they connected in series or parallel?

Normally open, connected in parallel

What function does a JOG button perform in a control circuit?

It momentarily runs the motor for easy positioning or setup purposes

How is a lamp added into a control circuit so it is ON anytime the motor is ON?

Wire the lamp in parallel with the starter

When connecting a DMM to L2 of a control circuit, which color DMM test lead is always used?

The black lead

When a switch is used to control a lamp or other load in a 24 VAC control circuit, what is the voltage measured across the switch when the switch is open and the load is OFF?

24 Vac

When a switch is used to control a lamp or other load in a 24 VAC control circuit, what is the voltage measured across the switch when the switch is closed and the load is ON?

0 Vac

When there is a short circuit in a control circuit, what function of the meter is used to test the circuit components before the faulty component is repaired and power restored?

Turn multimeter to resistance or continuity

What is the best type of pushbutton operator to use in an emergency stop application?

Mushroom-head

Can one pushbutton operate both NO and NC contacts?

Yes

What type (number) NEMA enclosure can be used to protect internal electrical components against prolonged submersion at a limited depth, such as occasional flooding of an area?

NEMA 6p

What is the IEC number used to describe the enclosure type that can protect internal electrical components against prolonged submersion at a limited depth, such as occasional flooding of an area?

IP68

A selector switch with a legend plate labeled SLOW/FAST is an example of what type of selector switch?

2 position

A selector switch with a legend plate labeled SLOW/OFF/FAST is an example of what type of selector switch?

3 position

In a truth table, an X represents what condition of the contacts?

Closed

In a truth table, an O represents what condition of the contacts?

Open

What is the main advantage of using a joystick in an application such as moving a passenger loading ramp to and from an airplane door?

It allows the operator to control the movement in multiple directions using a single hand, preventing conflicting motions

In a joystick symbol, what does the dot represent?

The center where the contact is closed

If the moving part of a limit switch is drawn below the contacts in the symbol, is the switch NO/NO held closed or NC/NC held open?

NO/NO held closed

If the moving part of a limit switch is drawn above the contacts in the symbol, is the switch NO/NO held closed or NC/NC held open?

NC/NC held open

What type of limit switch actuator allows detection of a moving object from any direction except head on?

Wobble stick

What type of limit switch actuator allows the arm length to be adjusted to meet the application?

Adjustable roller lever

When a foot switch has three positions, does the toe usually operate all three positions?

No

Is the OFF position of a foot switch usually a maintained position or a spring-loaded position?

Spring loaded position

When a pressure switch is rated in "in. WC," what does "in. WC" stand for?

Inches of water column

If a pressure switch is used to maintain a set pressure, are NO or NC contacts used to control the compressor motor starter?

NC

If a temperature switch is used in a heating system to maintain a set temperature, are NO or NC contacts used to control the heating contactor?

NC

If a temperature switch is used in a cooling system to maintain a set temperature, are NO or NC contacts used to control the air conditioning system?

NO

If a flow switch is used to sound an alarm when there is no flow, are NO or NC contacts used to control the alarm?

NC

If a flow switch is used to detect flow in an automatic sprinkler system that has detected a fire and opened the sprinklers to flow, are NO or NC contacts used to control the alarm?

NO

If a level switch is used in a charging system, are NO or NC contacts used to control the pump motor starter?

NC

If a level switch is used in a discharging system, are NO or NC contacts used to control the pump motor starter?

NO

Is a diode used to help protect electrical contacts in an AC or DC load switching circuit?

DC

What position are most flow switches designed to operate in?

Horizontal

If a voltage is measured going into a control switch and no voltage is measured out of the switch, what operating condition might the switch be in?

It's open / normally closed held open

If a voltage is measured going into a control switch and the same voltage is measured going out of the switch, what operating condition might the switch be in?

It's closed / normally open held closed

Does the added iron core of an electromagnet increase or decrease the magnetic lines of force?

Increase

In an electromagnet, what determines the strength of the magnetic field?

The amount of current going through it

What does the left hand rule determine when the direction of current is known?

The thumb will point to the north pole of the magnet

What is the moveable part of a solenoid called?

The Armature

Why are solenoid armatures laminated?

To reduce energy loss and disrupt eddy currents

Why is a shading coil added to the armature of a solenoid?

It's an auxiliary magnetic field that helps hold the armature as the main magnetic field drops to 0 in an ac circuit

What is the initial current draw of a solenoid called?

Inrush current

What is the operating current of a solenoid called?

Sealed Current