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- 1. Open EndedWhat is the simplest way to determine if the motor is overloaded?
- 2. Fill in the BlankConnecton diagrams are also called _______________ diagrams.
- 3. Open EndedWhat does it mean for a current transformer to have a ratio of 150:5?
- 4. Open EndedOne of the advantages of using a double-break contact instead of a single-break contact is that a double-break contact ___.
- 5. Open EndedThe movable contact of the normally open held closed switch is drawn below the stationary contact.
- 6. Open EndedWhat does it mean when components are shown connected by a dashed line in a schematic diagram.
- 7. Fill in the BlankA float switch is a device that _______________.
- 8. Open EndedVacuum contactors enclose their load contacts in a sealed vacuum chamber.
- 9. Open EndedWhat is an electromechanical device for repeatedly establishing and interrupting an electric power ciruit?
- 10. Open EndedA solenoid is an electromagnet with a movable plunger.
- 11. Open EndedWhich type of control is characterized by the use of push buttons, limit switches, pressure switches, and other sensing devices to control the operation of a magnetic contactor or starter.
- 12. Fill in the BlankLine voltage devices may have contacts rated for _____________________ amperes.
- 13. Open EndedMany bimetal strip type overload relays can be set for either manual or automatic reset.
- 14. Open EndedTrue Which contacts are used in the control circuit to form an electrical holding circuit.
- 15. Open Ended___ contactor assemblies are made of laminated steel.
- 16. Open EndedOne of the main considerations when installing a machine is the power source.
- 17. Open EndedPushbuttons are switches that are pushed to make or break contacts rather than moving a handle.
- 18. Fill in the BlankMany types of overload protectors operate on the relationship between _____________.
- 19. Fill in the BlankSolder melting type overloads are often call _____________________ overloads.
- 20. Fill in the BlankA push button is an example of a(n) _____________ control switch
- 21. Open Ended___ power line(s) must be broken when using a contactor to control a 3 phase load.
- 22. Fill in the BlankA ___________________ is basically a pictorial representation of the control components with connecting wires.
- 23. Fill in the BlankThe conductor size, fuse or circuit breaker size, and overload size are generally determined using ____________ and/or local codes.
- 24. Open EndedAny heat source can cause an overload to trip.
- 25. Fill in the BlankDouble break contacts break an electrical circuit in __________places.
- 26. Open EndedThe power rating of a contactor or motor starter ___ as the NEMA number (Size 1, 2, etc.) of the contactor or motor starter increases.
- 27. Open EndedA device used to change ac voltage from one level to a another
- 28. Open EndedThe double-acting push button has two terminal screws.
- 29. Fill in the BlankA motor controls circuit, for the most part, is simply a _________ and a motor
- 30. Fill in the BlankSchematics show motors and control equipment in their ________ state.
- 31. Open EndedWhen the coil of an alternating current relay or contactor is energized, it will require less current to pull the armature in than to hold it in.
- 32. Open EndedSome motors can draw up to 600 percent of rated full load current during starting.
- 33. Open EndedOverload relays are designed to open the circuit when the current becomes 115 percent to 125 percent of the motor full load current.
- 34. Open EndedAuxiliary contacts are intended to control large amounts of current.
- 35. Open EndedWith automatic control, an operator has to initiate certain actions.
- 36. Open EndedThe current rating of a contactor or motor starter is the rating for ___.
- 37. Open EndedConnecting parts that touch each other to complete a ciruit, and separate to open a ciruit.
- 38. Fill in the BlankA __________________ shows components in their electrical sequence without regard for physical location.
- 39. Fill in the BlankA float switch is an example of a(n) __________________ control switch.
- 40. Open EndedNormally open switches are drawn with the movable contact above and touching the stationary contact.
- 41. Fill in the BlankThe rule for numbering a schematic diagram is ________________________.
- 42. Fill in the BlankHaving both contactors in a reversing starter energized at the same time would result in _______________.
- 43. Fill in the BlankA contactor is a relay that contains ____________ contacts.
- 44. Open EndedThe basic START-STOP push button control circuit discussed in Chapter 7 can be modified to include a second STOP and START push button.
- 45. Fill in the BlankWhen a component is used to perform the function of a stop in a control circuit, it will generally be a normally ________________ contact.
- 46. Open EndedYou can obtain jogging control with the use of a selector switch.
- 47. Open EndedA control relay is used to provide jogging in one direction only.
- 48. Open EndedJogging can be accomplished using a double-acting push button.
- 49. Fill in the BlankNEC says motor control stop light must be red ____________.
- 50. Fill in the BlankWhen a component is used to perform the function of start it is generally connected in _________________ with the existing start button.
- 51. Open EndedA contactor may or may not contain auxiliary contacts.
- 52. Fill in the BlankMagnetic reversing starters generally change T leads ____________ and ___________ to reverse the motor.
- 53. Open EndedWhat is the difference between a contactor and a starter?
- 54. Fill in the BlankIn schematics, ________________ between components indicate that the components are mechanically connected together.
- 55. Open EndedIn a schematic, any contact that is marked with the same letter or number as a coil is controlled by that coil regardless of where it is located in the schematic.
- 56. Open EndedMost reversing controllers only contain mechanical interlocks.
- 57. Fill in the BlankWhen a component is used to perform the function of a stop in a control circuit, it will generally be a normally ________________ contact.
- 58. Fill in the BlankIn the accompanying figure, the START button acts as both the START and jog button for the circuit. A(n) ____________________ can be used to provide the same basic type control.
- 59. Fill in the BlankThe accompanying figure shows a(n) ____________________ diagram of a basic START-STOP push button control circuit.
- 60. Fill in the BlankThe accompanying figure shows the components needed to construct a(n) ____________________ control circuit.
- 61. Fill in the BlankIn the accompanying figure, the dashed lines drawn between the push buttons indicate that they are ____________________ connected.
- 62. Open EndedA single pole, single throw toggle switch provides jog or run control in the accompanying figure. If the switch is in the OFF position, the holding contacts can seal the circuit when the START button is released.
- 63. Fill in the BlankIn the circuit shown in the accompanying figure, when the forward jog push button is pressed, the normally open section makes connection and provides power to ____________________.
- 64. Fill in the BlankTwo circuits that employ a control relay to provide jogging are shown in the accompanying figure. In both these circuits the control relay provides the ____________________ contacts, not the M starter.
- 65. Open EndedWho should I thank for making this study guide?
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