AC/DC Motor Controls Flash Cards
1
Q
What are the most common control switches used on industrial equipment? A. Push buttons B. Joysticks C. Limit switches D. Pressure switches
A
A
2
Q
An _ is the part of a switch that includes the written description of the switch's operation. A. Contact Block B. Operator C.Shroud D. Legend Plate
A
D
3
Q
An _ is the device that is pressed, pulled, or rotated by the individual operating the circuit. A. Contact Block B. Operator C.Shroud D. Legend Plate
A
B
4
Q
An _ button operator can be operated from any angle and is used in applications that require fast operation such as emergency stops, motor stops, and valve shutoffs. A. Flush B. Half-Shrouded C. Extended D. Jumbo Mushroom
A
D
5
Q
A selector switch is a switch with an operator that is _ to activate the electrical contacts. A. Pushed B. Pulled C. Rotated D. Shifted
A
C
6
Q
A table is made and positioned near the switch to illustrate each position and each contact. A. Selector B. Wiring C. Schematic D. Truth
A
D
7
Q
An _ is placed in a truth table if a contact is closed in any position. A. X B. Dot C. C D. O
A
A
8
Q
A _ is an operator that selects one to eight different circuit conditions when it is shifted from its position. A. Push button B. Joystick C. Limit Switch D. Pressure Switch
A
B
9
Q
The most common application of a joystick is in controlling a _. A. hoist B. Boiler C. Lathe D. Bellows
A
A
10
Q
Line Diagrams may use an _ to indicate which joy stic k position will operate the contacts. A. Circle B. Square C. Dot D. X
A
C
11
Q
A _ switch is a mechanical input that requires physical contact of the object with the switch actuator. A. Pressure B. Limit C. Foot D. Temperature
A
B
12
Q
A _ is not a basic actuator used on limit switches. A. Push roller B. Fork Lever C. Wobble Stick D. Contact pole
A
D
13
Q
A fork lever actuator is an actuator operated by one of _ roller arms. A. Two B. Four C. Six D. Eight
A
A
14
Q
A _ actuator is an actuator operated by direct forward movement into the limit switch. A. Push roller B. Fork lever Wobble-stick Contact pole
A
A
15
Q
A _ is not a common foot switch application. A. Sewing machine B. Drill Press C. Lathe D. Two-handed safety circuit
A
D
16
Q
Most foot switches have _ positions. A. One B. Two C. Three D. Four
A
B
17
Q
In a foot switch, the _ position is normally spring-loaded so that the switch automatically returns to that position when released. A. Open B. Memory C. ON D. OFF
A
D
18
Q
One psi equals _ in WC. A. 22.68 B. 27.68 C. 32.68 D. 37.68
A
B
19
Q
A _ is not a common sensing device used by most pressure switches. A. diaphragm B. Bellow C. Barometer D. Piston
A
C
20
Q
_ is the amount of pressure that must be removed before the switch contacts reset for another cycle after the set point has been reached and the switch has been actuated. A. Dead band B. Hysteresis C. Back lash D. Synchromesh
A
A
21
Q
_ switches are control devices that react to heat intensity. A. Pressure B. Temperature C. Flow D. Level
A
B
22
Q
An _ system is not a common application of temperature switches. A. Fire alarm B. Cooling C. Equipment Protection D. Air compression
A
D
23
Q
In a cooling system, as the ambient temperature _, the switch contacts close and turn on a cooling device. A. Falls B. Rises C. Stabilizes D. Cools
A
B
24
Q
_ is the travel of fluid in response to a force caused by pressure or gravity. A. Flow B. Density C. Force D. Velocity
A
A
25
Q
An _ is a magnet whose magnetic energy is produced by the flow of electric current. A. Coiled magnet B. Electromagnet c. Ferromagnet D. Hybrid magnet
A
B
26
Q
An electromagnet consists of an _ core inserted into a coil. A. Copper B. Lead C. Aluminum D. Iron
A
D
27
Q
The left-hand rule states that if the fingers of the left hand are wrapped in the direction of the current flow of the coil, the thumb points to the magnetic _ pole. A. North B. East C.South D. West
A
A
28
Q
An electromagnet's strength can be controlled by regulating its _. A. Coils B. Field C. Electric current D. Polarity
A
C
29
Q
The strength of a magnetic field and current are _ related. A. Not B. Directly C. Inversely D. Sometimes
A
B
30
Q
An _ is the movable part of a solenoid. A. Spool B. Armature C. Bell-crank D. Commutator
A
B
31
Q
There are _ different solenoid configurations. A. Two B. Three C. Four D. Five
A
D
32
Q
A _ solenoid uses a lever attached to an armature to transform the armature's vertical action into a horizontal action. A. Clapper B. Bell-crank C. Vertical-action D. Horizontal-action
A
B
33
Q
_ current is unwanted current induced in the metal structure of a device due to a rate of change in the induced magnetic field. A. Eddy B. Air gap C. Shading D. Armature
A
A
34
Q
An _ coil sets up an auxillary magnetic field that helps hold in the armature as the main coil magnetic field drops to zero in an AC circuit. A. Eddy B. Air gap C. Shading D. Armature
A
C.
35
Q
A _ is an electric output device that converts electrical energy to linear mechanical force. A. Commutator B.Motor C.Limit switch D. Solenoid
A
D
36
Q
An _ is a single turn of conducting material (normally aluminum or copper ) mounted on the face of the magnetic laminate assembly or armature of a solenoid. A. Capacitor B.Shading coil Commutator D. Armature
A
B
37
Q
Magnetic coils are normally constructed of many turns of insulated _ wire wound on a spool. A. Copper B. Lead C. Aluminum D. Iron
A
A
38
Q
In a solenoid coil, the inrush current is approximately _ times the sealed current. A. 1 to 5 B. 6 to 10 C. 11 to 15 D. 16 to 20
A
B
39
Q
The magnetic opposition upon energizing a solenoid is referred to as _ reactance or tota l impedance. A. Capacitance B.Conductive C. Instructive D. Inductive
A
D
40
Q
Magnetic coil data is normally given in _. A. Volt amperes B. Watts C. Joules D. Pascals
A
A
41
Q
_ Voltage is the minimum voltage that causes the armature to start or move. A. Pick up B. Shut-down C. Seal -in D. Drop-out
A
A
42
Q
For most solenoids, the minimum pick-up voltage is about _ of the solenoid rated voltage. A. 60% to 65% B. 70% to 75% C. 80% to 85% D. 90% to 95%
A
C
43
Q
Drop-out voltage can be low as _% of the solenoid rated voltage. A.60 B.70 C.80 D.90
A
B
44
Q
_ variations are one of the most common causes of solenoid failure. A. Pressure B.Current C. Temperature D. Voltage
A
D
45
Q
A solenoid's _ is usually given in operations per minute. A. length of stroke B. Required force C. Duty Cycle Mounting
A
C
46
Q
_ voltage is the minimum control voltage required to cause the armature to seal against the pole faces of the magnet. A. Seal-in B. Activation C. Pick-up D. Drop-out
A
A
47
Q
A _ control valve is a valve that is used to direct the flow of fluid throughout a fluid power system. A. Horizontal B. Flow C. Rotary D. Directional
A
D
48
Q
A _ is the number of locations within the valve in which the spool can be placed to direct fluid through the valve. A. Position B. Way C. Pilot D.Cycle
A
A
49
Q
A _ is a flow path through a valve. A. Position B. Way C. Spool D. Cycle
A
B
50
Q
_-way valves are used as shutoff, check, and quick-exhaust valves. A. One B. Two C. Three D. Four
A
B
51
Q
_ use fluid power, cylinders, actuators, and grippers to provide the required power and movement. A. Combustion controls B. Refrigeration systems C. Industrial robots D. HVAC controls
A
C
52
Q
_ are used to help determine the cause of solenoid failure. A. Snubbers B. Transients C. Manufacturer charts D. Spools
A
C
53
Q
The voltage applied to a solenoid should be +_% of the solenoid rated value. A. 10 B.20 C.30 D.40
A
A
54
Q
A _ circuit is a circuit that suppresses noise and high voltage on the power lines. A. Muted B. Muffled C. Transient D. Snubber
A
D
55
Q
A solenoid _ when the voltage is excessive. A. Chatters B. Overheats C. Operates erratically D. Fails to pull in
A
B
56
Q
A solenoid draws _ current when first connected to power. A. A slow rush B. No C. Several times its rated D. Its rated
A
C
57
Q
Solenoids usually fail due to electrical problems or _. A. Mechanical damage B. Contamination C. Lack of lubrication D. Back pressure
A
A
58
Q
A _ is a device that controls on electrical circuit by opening and closing contacts in another circuit. A. Relay B. Disconnect C. Circuit breaker D. Fuse
A
A
59
Q
Depending on design, relays normally do not control power-consuming devices directly, except for small loads that draw less than _ A. A. 5 B. 10 C. 15 D. 20
A
C
60
Q
An _ relay is a switching device that has sets of contacts that are closed by a magnetic effect. A. Electromechanical B. Solid-state C. Variable D. Capacitive
A
A
61
Q
A _ realay is amechanical switch operated by a magnetic coil. A. General-purpose B. Capacitive C. Float D. Reed
A
A
62
Q
_ relays are designed for commercial and industrial applications where economy and fast replacement are high priorities. A. Capacitive B. Inductive C. Variable D. General-purpose
A
D
63
Q
Relay _ are described by their number of poles, throws, and breaks. A. Circuits B.Contacts C. Coils D. Armantures
A
B
64
Q
Relays are available with 1 to _ poles. A. 2 B. 12 C. 22 D. 32
A
B
65
Q
All contacts can have a minimum of _ breaks. A. One B. Two C. Three D. Four
A
B
66
Q
A relay contact with one pole, two throws, and one break is abbreviated as _. A. SPST-SB B.SPST-DB C. SPST-SB D.SPDT-DB
A
C
67
Q
A form _ relay has one contact that NO and closes when the coil is energized. A. A B. B C. C D. D
A
C
68
Q
_ relays are the backbone of electromechanical control circuitry and are expected to have a long life and a minimal amount of problems. A. Inductive B. Magnetic level C. Reed D. Machine control
A
D
69
Q
_ is/are not an additional feature of machine control delays. A. Time delay B. Latching C. Hermetic sealing D. Convertible contacts
A
C
70
Q
A _ relay is a fast-operating, single-pole, single throw switch with normally open contacts hermetically sealed in a glass envelope. A. General-purpose B. Magnetic level C. Reed D. Machine control
A
C
71
Q
Reed relays are sealed with dry _, creating a clean inner atmosphere for the contacts. A. Oxygen B. Nitrogen C. Carbon dioxide D. Methane
A
B
72
Q
A _ switch contains a float, a moving magnet, and a magnetically operated reed switch to detect the level of a liquid. A. General-purpose B. Magnetic level C. Reed D. Machine control
A
B
73
Q
A relay should be checked for contact _ or binding if it is not functioning properly. A. Heater size B. Bounce C. Overvoltage D. Sticking
A
D
74
Q
Overvoltage of undervoltage conditions in relays of more than _% should be corrected. A. 5 B. 10 C. 15 D. 20
A
B
75
Q
When trouble shooting EMR's the relay _ and contacts are checked to determine whether the relay is the problem. A. Spring B. Coil C. Input D. Output
A
B
76
Q
_ drawings show physical details of an object as seen by the eye. A. Electrical B. Pictorial C. Circuit D. Schematic
A
B
77
Q
An _ is a letter or combination of letters that represents a word. A. Symbol B. Abbreviation C. Pictorial Drawing D. Schematic
A
B
78
Q
An _ is a graphic element that represents a quantity or unit.
A. Symbol
B. Abbreviation
C. Pictorial Drawing Bock
A
A
79
Q
A _ diagram is a diagram that shows the connection of all components in a piece of equipment. A. Schematic B. Wiring C. Line (Ladder) D. Block
A
C
80
Q
_ diagrams are intended to show the circuitry that is necessary for the basic operation of a device. A. Schematic B. Line (Ladder) C. Wiring D. Block
A
C
81
Q
A _ diagram is used to show the relationship between circuits and their components but not the actual location of the components. A. Schematic B. Line (Ladder) C. Wiring D. Block
A
B
82
Q
The primary function of a _ diagram is to show how the distinct parts of a system relate. A. Schematic B. Line (Ladder) C. Wiring D. Block
A
D
83
Q
A _ diagram is a diagram that uses single lines and graphic symbols to indicate the path and components of an electrical circuit. A. Schematic B. Line (Ladder) C. Wiring D. One-line
A
D
84
Q
A _ is a diagram that shows a logical sequence of steps for a given set of conditions. A. Line Diagram B. Flow Chart C. Schematic Diagram D. Pie Chart
A
B
85
Q
An _ indicates the beginning and end of a flow chart or section of a flow chart. A. Rectangle B. Ellipse C. Diamond D. Arrow
A
B
86
Q
All electrical circuits include _ basic components. A. Two B. Three C. Four D. Five
A
D
87
Q
An _ is a disconnect switch with circuit breakers (CBs) or fuses added to provide over current protection for the switched circuit. A. Contactor B. Motor Starter C. Control Switch D. Overcurrent Protection Device (OCPD)
A
D
88
Q
A _ is a device that converts various forms of energy into electricity. A. Power source B. Conductor C. Control Switch D. Circuit Breaker
A
A
89
Q
An _ is a material that has very little resistance to current flow and permits electrons to move through it easily. A. Fuse B. Conductor C. Power source D. Control Switch
A
B
90
Q
_ is the most commonly used conductor material. A. Brass B. Copper C. Steel D. Silver
A
B
91
Q
A _ is an overcurrent protection device with a mechanical mechanism that may manually or automatically open the circuit when an overload condition or short circuit occurs. A. Power source B. Circuit breaker C. Conductor D. Switch
A
B
92
Q
Solenoids, _, and magnetic motor starters are used for remote control of devices. A. Circuit breakers B. Contactors C. Manual Switches D. Fuses
A
B
93
Q
A _ is an electric output device that converts electrical energy into a linear mechanical force. A. Solenoid B. Contactor C. Conductor D. Circuit breaker
A
A
94
Q
A _ is a control device that uses a small control current to energize or de-energize the load connected to it. A. Solenoid B. Contactor C. Conductor D. Circuit Breaker
A
B
95
Q
_ involves identifying an electrical symbol, understanding where the component is located within the system, and understanding how it is used. A. Analysis B. Surveying C. Printreading D. Troubleshooting
A
C
96
Q
No more than _ load(s) should be placed in any circuit line between the power lines L1 and L2. A. One B. Two C. Three D. Four
A
A
97
Q
Two loads must not be connected in _ in one line of a line diagram. A. Series B. Parallel C. Series/ Parallel D. Tandem
A
A
98
Q
A _ is the electrical device in a line diagram that uses the electrical power from L1 to L2. A. Switch B. Fuse C. Load D. Conduit
A
C
