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- 1. Open-ended30 seconds1 ptWhat is the simplest way to determine if the motor is overloaded?
- 2. Fill-in-the-Blank30 seconds1 ptConnecton diagrams are also called _______________ diagrams.
- 3. Open-ended30 seconds1 ptWhat does it mean for a current transformer to have a ratio of 150:5?
- 4. Open-ended30 seconds1 ptOne of the advantages of using a double-break contact instead of a single-break contact is that a double-break contact ___.
- 5. Open-ended30 seconds1 ptThe movable contact of the normally open held closed switch is drawn below the stationary contact.
- 6. Open-ended30 seconds1 ptWhat does it mean when components are shown connected by a dashed line in a schematic diagram.
- 7. Fill-in-the-Blank30 seconds1 ptA float switch is a device that _______________.
- 8. Open-ended30 seconds1 ptVacuum contactors enclose their load contacts in a sealed vacuum chamber.
- 9. Open-ended30 seconds1 ptWhat is an electromechanical device for repeatedly establishing and interrupting an electric power ciruit?
- 10. Open-ended30 seconds1 ptA solenoid is an electromagnet with a movable plunger.
- 11. Open-ended30 seconds1 ptWhich 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-Blank30 seconds1 ptLine voltage devices may have contacts rated for _____________________ amperes.
- 13. Open-ended30 seconds1 ptMany bimetal strip type overload relays can be set for either manual or automatic reset.
- 14. Open-ended30 seconds1 ptTrue Which contacts are used in the control circuit to form an electrical holding circuit.
- 15. Open-ended30 seconds1 pt___ contactor assemblies are made of laminated steel.
- 16. Open-ended30 seconds1 ptOne of the main considerations when installing a machine is the power source.
- 17. Open-ended30 seconds1 ptPushbuttons are switches that are pushed to make or break contacts rather than moving a handle.
- 18. Fill-in-the-Blank30 seconds1 ptMany types of overload protectors operate on the relationship between _____________.
- 19. Fill-in-the-Blank30 seconds1 ptSolder melting type overloads are often call _____________________ overloads.
- 20. Fill-in-the-Blank30 seconds1 ptA push button is an example of a(n) _____________ control switch
- 21. Open-ended30 seconds1 pt___ power line(s) must be broken when using a contactor to control a 3 phase load.
- 22. Fill-in-the-Blank30 seconds1 ptA ___________________ is basically a pictorial representation of the control components with connecting wires.
- 23. Fill-in-the-Blank30 seconds1 ptThe conductor size, fuse or circuit breaker size, and overload size are generally determined using ____________ and/or local codes.
- 24. Open-ended30 seconds1 ptAny heat source can cause an overload to trip.
- 25. Fill-in-the-Blank30 seconds1 ptDouble break contacts break an electrical circuit in __________places.
- 26. Open-ended30 seconds1 ptThe 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-ended30 seconds1 ptA device used to change ac voltage from one level to a another
- 28. Open-ended30 seconds1 ptThe double-acting push button has two terminal screws.
- 29. Fill-in-the-Blank30 seconds1 ptA motor controls circuit, for the most part, is simply a _________ and a motor
- 30. Fill-in-the-Blank30 seconds1 ptSchematics show motors and control equipment in their ________ state.
- 31. Open-ended30 seconds1 ptWhen 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-ended30 seconds1 ptSome motors can draw up to 600 percent of rated full load current during starting.
- 33. Open-ended30 seconds1 ptOverload relays are designed to open the circuit when the current becomes 115 percent to 125 percent of the motor full load current.
- 34. Open-ended30 seconds1 ptAuxiliary contacts are intended to control large amounts of current.
- 35. Open-ended30 seconds1 ptWith automatic control, an operator has to initiate certain actions.
- 36. Open-ended30 seconds1 ptThe current rating of a contactor or motor starter is the rating for ___.
- 37. Open-ended30 seconds1 ptConnecting parts that touch each other to complete a ciruit, and separate to open a ciruit.
- 38. Fill-in-the-Blank30 seconds1 ptA __________________ shows components in their electrical sequence without regard for physical location.
- 39. Fill-in-the-Blank30 seconds1 ptA float switch is an example of a(n) __________________ control switch.
- 40. Open-ended30 seconds1 ptNormally open switches are drawn with the movable contact above and touching the stationary contact.
- 41. Fill-in-the-Blank30 seconds1 ptThe rule for numbering a schematic diagram is ________________________.
- 42. Fill-in-the-Blank30 seconds1 ptHaving both contactors in a reversing starter energized at the same time would result in _______________.
- 43. Fill-in-the-Blank30 seconds1 ptA contactor is a relay that contains ____________ contacts.
- 44. Open-ended30 seconds1 ptThe 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-Blank30 seconds1 ptWhen a component is used to perform the function of a stop in a control circuit, it will generally be a normally ________________ contact.
- 46. Open-ended30 seconds1 ptYou can obtain jogging control with the use of a selector switch.
- 47. Open-ended30 seconds1 ptA control relay is used to provide jogging in one direction only.
- 48. Open-ended30 seconds1 ptJogging can be accomplished using a double-acting push button.
- 49. Fill-in-the-Blank30 seconds1 ptNEC says motor control stop light must be red ____________.
- 50. Fill-in-the-Blank30 seconds1 ptWhen a component is used to perform the function of start it is generally connected in _________________ with the existing start button.
- 51. Open-ended30 seconds1 ptA contactor may or may not contain auxiliary contacts.
- 52. Fill-in-the-Blank30 seconds1 ptMagnetic reversing starters generally change T leads ____________ and ___________ to reverse the motor.
- 53. Open-ended30 seconds1 ptWhat is the difference between a contactor and a starter?
- 54. Fill-in-the-Blank30 seconds1 ptIn schematics, ________________ between components indicate that the components are mechanically connected together.
- 55. Open-ended30 seconds1 ptIn 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-ended30 seconds1 ptMost reversing controllers only contain mechanical interlocks.
- 57. Fill-in-the-Blank30 seconds1 ptWhen 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-Blank30 seconds1 ptIn 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-Blank30 seconds1 ptThe accompanying figure shows a(n) ____________________ diagram of a basic START-STOP push button control circuit.
- 60. Fill-in-the-Blank30 seconds1 ptThe accompanying figure shows the components needed to construct a(n) ____________________ control circuit.
- 61. Fill-in-the-Blank30 seconds1 ptIn the accompanying figure, the dashed lines drawn between the push buttons indicate that they are ____________________ connected.
- 62. Open-ended30 seconds1 ptA 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-Blank30 seconds1 ptIn 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-Blank30 seconds1 ptTwo 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-ended30 seconds1 ptWho should I thank for making this study guide?
