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106 Matching questions

  1. Which of the following is a requirement of a permanent splice?
  2. What type of packing glands should be locked?
  3. All trailing cables used to conduct electrical energy to face equipment shall conform to the following EXCEPT:
  4. What is the minimum distance from combustible material that unattended enclosed motors, rectifiers, and transformers may be placed?
  5. Tools or switches held in the operators hand or supported against his body:
  6. A .007-inch feeler gauge is used by an inspector to check:
  7. What is the maximum allowable speed of travel of a machine that receives power through a trailing cable?
  8. Lenses for headlights used on mining machines must be constructed of glass or other suitable material with physical characteristics:
  9. The primary function of a strain clamp is to:
  10. A .005-inch feeler gauge is used to check:
  11. The minimum-sized trailing cable permitted for direct current powered mobile haulage units is:
  12. What minimum clearance must be maintained between the packing gland nut and the stuffing box?
  13. A cable reel is required on self-propelled equipment that travels at a speed exceeding:
  14. Permissible electrical equipment is equipment which:
  15. Conduit hose must be marked flame resistant:
  16. The maximum length permitted for trailing cables (4/0 and larger) is:
  17. The maximum clearance between the lid and the box of a step-flange joint is:
  18. When a bolt hole in an explosion-proof enclosure is stripped out, it:
  19. All unused holes in permissible compartments must be:
  20. The term "intrinsically safe circuits" refers to circuits that:
  21. Control panels and electrical motors are equipped with access openings and inspection covers:
  22. Packing material used in stuffing boxes should be:
  23. Battery boxes:
  24. What is the minimum-sized trailing cable permitted for AC-powered mobile haulage units?
  25. Trailing cables must be marked:
  26. Before electric face equipment is deemed permissible, the equipment must meet the:
  27. Cast or welded enclosures should be designed to withstand a minimum internal pressure of:
  28. A permissible box must withstand an explosion pressure of:
  29. What should be provided in the bottom of each battery box?
  30. A screw type joint cannot be used if:
  31. The maximum operating temperature of the external surface of a machine is:
  32. Insulated wires should pass through metal walls of electric compartments only through:
  33. When a bolt with a diameter larger than 3/8-inch is used, thread engagement should be:
  34. "Flame-resistant," as applied to trailing cables and conduit hose, means:
  35. The maintenance required to keep equipment in permissible condition is the responsibility of the:
  36. What is the most violent explosive percent of methane?
  37. The primary purpose of a breather on explosion-proof compartments is:
  38. The maximum speed of travel of a machine receiving power from a trailing cable.
  39. All mobile equipment that is powered by a trailing cable and travels in excess of 2.5 mph must be provided with:
  40. To meet the requirements of Schedule 2G, all conduit hose on equipment:
  41. The use of bolts with more than one lock washer in a control panel box is considered:
  42. Which of the following is allowed to be under a permissible bolt?
  43. Permissible electric face equipment is defined as:
  44. The purpose of hose conduit is to:
  45. What is the minimum distance from the interior of an enclosure to the edge of a bolt hole (more than 124 cubic inches)?
  46. A No. 6 AWG trailing cable should be no longer than:
  47. A flat metal to metal joint is a:
  48. In most cases, the length of a portable cable should not exceed:
  49. If the cover of the permissible compartment has a step shape, it is:
  50. Flame resistant as applied to trailing cables and hose conduit means:
  51. If there are damaged threads on a screw-type cover:
  52. The packing material in a stuffing box is compressed tightly against the cable by:
  53. Permissible compartments are designed to be:
  54. Plane flange joints and step flange joints are the types of joints formed:
  55. Which of the following is NOT a requirement of cables between machine components?
  56. The minimum thickness of hose conduit allowed is:
  57. Which of the following is NOT a requirement of a permanent splice?
  58. Plane flange joints on explosion-proof enclosures cannot exceed a separation distance of:
  59. What is the maximum radial clearance that should be allowed when installing a typical plug for spare lead entrance holes?
  60. Each bolt, stud or screw used to fasten a cover to an explosion-proof enclosure must be provided with a:
  61. The minimum amount of packing that should be in a packing gland along a conductor is:
  62. What size feeler gauge should be used to check end bells on most motors?
  63. What size feeler gauge should be used to check plane flange joints?
  64. The maximum surface temperature of all components on machines approved under Schedule 2G is:
  65. Because of the electrical wiring inside headlights, the lens rings:
  66. Battery-box covers must meet all of the following requirements, EXCEPT:
  67. The frame to ground potential of any off-track machine must not exceed:
  68. The number of temporary splices permitted in a single length of trailing cable is:
  69. In low-and medium-voltage, three-phase AC systems, the maximum ground-fault tripping current should not exceed:
  70. If the threads are stripped out of the cover of an explosion-proof box, which of the following methods is NOT accepted method of repair?
  71. Breathers or pressure-relief devices are installed on an explosion-proof enclosure to:
  72. All bolts in a permissible enclosure must have:
  73. Cable grips or insulated clamps shall be provided on:
  74. What is the minimum size of asbestos packing material allowed?
  75. Which of the following is a requirement of a temporary splice?
  76. Permissibility is required for electrical equipment and components:
  77. Since certain electrical components almost always spark when in operation, they:
  78. A tool or switch that is held in an operator's hand or supported against an operator's body will NOT be approved if the nameplate rating on the tool or switch exceeds:
  79. An electric motor that is a power source for a permissible mining machine:
  80. What is the maximum-sized spacing permitted for bolts securing enclosure covers with joints all in one plane?
  81. If trailing cables are run over by mobile face equipment:
  82. What is the maximum tramming speed permitted for a continuous miner?
  83. To protect the trailing cable from being run over by mobile equipment,all self-propelled equipment:
  84. The "dead-man" type switch on a hand-held tool functions by:
  85. If the threads in the bolt holes of a permissible enclosure are stripped out, which of the following is NOT an acceptable means of repair?
  86. Conduit hose is used for:
  87. Electrical components that normally arc during operation:
  88. How far should a 1/2-inch bolt extend into the threaded portion of the hole?
  89. The maximum clearance of a plane flange joint allowed for permissibility is:
  90. Stuffing boxes are drilled into the walls of the explosion-proof enclosures in such a way that:
  91. Which of the following is NOT a requirement of a temporary splice made in a trailing cable?
  92. All trailing cables and drop cables must have:
  93. To check a step flange joint you should use what size feeler gauge?
  94. To check a plane flange joint you would use what size feeler gauge?
  95. What is the minimum thread engagement of bolts for an enclosure which is greater than 124 inches?
  96. When mounting ground wires:
  97. Each wire or cable leaving a battery box on storage battery operated equipment shall have:
  98. All electric equipment used in return air outby the last open crosscut:
  99. Battery box covers:
  100. A permissible joint that is made of a large screw with five or six threads is called a:
  101. What is the explosive range of methane?
  102. When a bolt hole in an explosion-proof enclosure is stripped out, and re-tapping it to the next larger size:
  103. Any underground machine traveling faster than how many MPH must be equipped with a cable reel?
  104. Conductors must have current-carrying capacities that meet:
  105. How should hose conduit be marked to indicate it is flame-resistant?
  106. Inspection covers or screw type joints must be:
  1. a 1/2 inch.
  2. b Drainage holes.
  3. c Mine operator.
  4. d .005 inch.
  5. e Be made of a non-sparking material.
  6. f 1/8 inch.
  7. g No.6 AWG.
  8. h 2.5 mph
  9. i A restraining clamp in permissible condition.
  10. j Plane flange joints.
  11. k .004 inch.
  12. l Have at least 3 power wires and one ground wire.
  13. m Threaded in snug and locked in place.
  14. n An approved packing material.
  15. o 10%.
  16. p It will burn when held in a flame but will cease when the flame is removed.
  17. q 0.004 inch.
  18. r Relieve pressure, ventilate, or drain.
  19. s 3/16 inch.
  20. t Equipment which has been tested and approved.
  21. u 0.006 inch.
  22. v Portable trailing cables.
  23. w To allow harmful gases that cause corrosion to escape.
  24. x Is similar in all respects to that which has been approved by the USBM.
  25. y Cannot have a nameplate voltage rating of more than 300 volts.
  26. z 6 inches.
  27. aa There's space for packing material to be placed around the cable.
  28. ab When two pieces of metal come together.
  29. ac 3/8 inch.
  30. ad Provide for mechanical protection.
  31. ae 7/16 inch.
  32. af .007 inch.
  33. ag It must be more than 25 feet from the machine (except cable reel).
  34. ah The cover must be replaced.
  35. ai Must be adequately ventilated.
  36. aj 150 PSI.
  37. ak 150 psi.
  38. al 550 feet
  39. am 150 Centigrade or 302 Fahrenheit.
  40. an It must be mechanically strong with adequate conductivity.
  41. ao Lock washers.
  42. ap 25 amps
  43. aq 6 mph.
  44. ar Step flange joints.
  45. as Plane Flange Joint.
  46. at Short-circuit protection in an explosion-proof enclosure.
  47. au Must be properly enclosed to be considered permissible.
  48. av Which moves faster than 2.5 mph must be equipped with cable reels.
  49. aw The mechanical protection of a cable.
  50. ax Specifications set forth by the Secretary.
  51. ay Flame-resistant USBM - Not exceeding 3 feet.
  52. az Lock washer.
  53. ba 5% to 15%.
  54. bb Inby the last open crosscut and in return air.
  55. bc Cables and hose will burn when held in a flame, but will cease burning when removed from flame.
  56. bd 0.007 inch.
  57. be Drill hole through and use bolt nut.
  58. bf At least 1/2 inch.
  59. bg Should be mechanically tight and sealed or padlocked.
  60. bh No.4 AWG
  61. bi ICEA standards
  62. bj One.
  63. bk Flame-resistant.
  64. bl A cable reel.
  65. bm 150 degrees Centigrade.
  66. bn Must be lined with a flame-resistant insulating material preferably bonded to the inside of the cover.
  67. bo They must be less than 6 feet in length.
  68. bp Arcing or sparking could result which, in turn, could set off an explosion or cause a fire.
  69. bq 40 volts.
  70. br The threads are damaged.
  71. bs Closed with specially designed fittings or plugs.
  72. bt An improper assembly.
  73. bu 1,000 feet.
  74. bv 500 feet.
  75. bw Lock washer to help hold it in position.
  76. bx Must be flame-resistant.
  77. by So maintenance personnel can more readily check for damaged or worn parts.
  78. bz It must be vulcanized.
  79. ca Explosion proof.
  80. cb Drill a hole through and use a nut and bolt.
  81. cc Must be permissible.
  82. cd Must be placed in explosion-proof enclosures before they are considered "permissible."
  83. ce A 3/16-inch diameter if round and 3/16 x 3/16-inch if square.
  84. cf 2.5 MPH.
  85. cg Must be explosion-proof
  86. ch 300 volts DC or AC.
  87. ci .003 inch.
  88. cj Screw type joint.
  89. ck Tightening the packing gland nut.
  90. cl 2 feet.
  91. cm Is no longer considered permissible
  92. cn 1/2-inch thick tempered glass.
  93. co It must be mechanically strong and well-insulated.
  94. cp 0.005 inch.
  95. cq Transfer most of the strain from the trailing cable to the frame of the equipment it feeds.
  96. cr Always use terminals or clamps.
  97. cs Every three feet.
  98. ct A step flange joint.
  99. cu Insulated bushings.
  100. cv Equal to or greater than the diameter of the bolt.
  101. cw Do spark but will not ignite a methane-air mixture
  102. cx 2.5 MPH
  103. cy 6 MPH.
  104. cz 7/16 of an inch of metal from the interior of the enclosure to the closest edge of the hole must be maintained.
  105. da All glands
  106. db Closing with hand pressure and opening if pressure is released.