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140 Multiple choice questions

  1. Pulsating current.
  2. Knife switch.
  3. Speeds up.
  4. Provides a return path to the earth and prevents voltage from existing on the frames of the equipment.
  5. The resistor has burned open.
  6. Disconnect the source voltage.
  7. Increase.
  8. Stop the drive when the belt is slipping.
  9. An electromagnetic field.
  10. 5,000 watts.
  11. Single-phase power.
  12. KVA rating.
  13. Shorted.
  14. Current in the circuit would be reduced.
  15. Not charge the battery
  16. Current.
  17. Rectifiers.
  18. The motor will overspeed to the point of destruction.
  19. Overload and single-phase protection on three-phase circuits.
  20. Relay.
  21. First starts
  22. Contactor.
  23. Jumper.
  24. Provide sufficient energy to trip the breaker, even after power goes off.
  25. Reverse either the armature or the series field leads.
  26. Frame ground conductor.
  27. Circuit breaker.
  28. Proper fuses.
  29. Carbon.
  30. Insure continuity of the grounding circuit.
  31. A circuit breaker.
  32. Changes AC current to DC current.
  33. The series field is good.
  34. Both speed and direction
  35. Joints cannot be closed tightly enough to get the required cooling action; therefore permissibility is destroyed.
  36. Series with the motor circuit.
  37. Lies primarily in how quickly they trip a circuit breaker.
  38. The pump should start because the float switch completed an electrical circuit
  39. Block the machine so it doesn't move.
  40. Provide sufficient energy to trip the breaker, even after the power goes off.
  41. Three-phase.
  42. Electrical and/or mechanical interlocks.
  43. Series with the operating coil.
  44. Once every calendar year.
  45. The fuse was blown.
  46. Ammeter
  47. Not cause a voltage drop.
  48. Direct current.
  49. Voltage.
  50. By changing the direction of the current flow in either the armature or series field.
  51. It will allow current flow in only one direction once it is gated.
  52. Current in one direction.
  53. Current.
  54. 26.11KW.
  55. Overcurrent.
  56. One wire would be ten times the length of the other.
  57. Good.
  58. Current remains the same at all loads.
  59. Resistors.
  60. Ammeter.
  61. A variable resistance in a separate field circuit.
  62. It helps to extinguish the arc when the contactor opens.
  63. Step up or step down AC voltage.
  64. F1 and F2 leads.
  65. A shunt motor.
  66. The clips holding the fuse are loose.
  67. 200 strands.
  68. Transformers.
  69. A thermal element heats up and actuates the contacts.
  70. There would be a real potential for electrical shock.
  71. Series with the motor lead.
  72. It limits the starting current during start-up by reducing the voltage.
  73. All three phases at the same time.
  74. Wait for the thermal element in the breaker to cool sufficiently so that it will hold in the tripping mechanism.
  75. Through the control circuit which will open the line contactors.
  76. Smaller wires which are not insulated from one another.
  77. Volt.
  78. Install the 15-amp fuse
  79. Ohmmeter
  80. To protect the operator from shock by keeping the equipment at earth potential.
  81. The size of the conductor.
  82. Silicon controlled rectifier.
  83. Compound motor.
  84. Allow it to cool.
  85. Grounding resistor.
  86. The secondary windings would be larger in size (AWG) than those on the primary side.
  87. Microfarad.
  88. Knock the victim off with a nonconductive object.
  89. Direction of the current flow through the armature.
  90. Jumper-out the methane monitor.
  91. Short circuit.
  92. Higher.
  93. A conductor connected to the system ground.
  94. Short circuit protection.
  95. Disconnect switch located near the motor.
  96. Motor
  97. A 15-HP, 220-volt motor.
  98. Maximum time period it can safely operate.
  99. Loosely.
  100. The short circuit setting.
  101. Megger.
  102. Insulation resistance.
  103. Insulation.
  104. The fuse
  105. Series with the operating coil.
  106. Regulating the applied voltage.
  107. A megger.
  108. 1,100 amps.
  109. Ohmmeter with power off.
  110. The shuttle car runs over the miner cable causing two conductors to come in contact with each other.
  111. The amount of current that a breaker can carry under normal conditions.
  112. A fire may result or the equipment may become damaged.
  113. Protect the motor from overload.
  114. Single phase.
  115. Power diagram.
  116. Short circuit and overload protection.
  117. Overvoltage.
  118. The copper wire will not provide adequate overcurrent protection.
  119. A low resistance reading in one direction and a very high reading in the other direction.
  120. The action of an electrical current which carries away particles of a conductor.
  121. Voltmeter.
  122. Looking at the tag attached to the motor housing
  123. No current flows beyond it into the circuit.
  124. The circuit breaker will not stay closed.
  125. Three.
  126. Circuit breaker.
  127. Blowout coils.
  128. Momentary.
  129. Higher resistance.
  130. Zero volts.
  131. Direction of rotation remains the same.
  132. Increase
  133. S1and S2.
  134. The fuse was good
  135. Voltage.
  136. Cool the rectifier.
  137. An electrical system.
  138. Too much current could be allowed to pass through, overheating. equipment and burning off insulation.
  139. Ohm.
  140. The armature circuit is open.