120 Multiple choice questions

1. A restraining clamp in permissible condition.
   1. All trailing cables and drop cables must have:
   2. A No. 6 AWG trailing cable should be no longer than:
   3. Trailing cables must be marked:
   4. If trailing cables are run over by mobile face equipment:
2. A step flange joint.
   1. All unused holes in permissible compartments must be:
   2. Which of the following is a requirement of a permanent splice?
   3. If the cover of the permissible compartment has a step shape, it is:
   4. All bolts in a permissible enclosure must have:
3. 6 mph.
   1. What is the minimum distance from combustible material that unattended enclosed motors, rectifiers, and transformers may be placed?
   2. What is the maximum allowable speed of travel of a machine that receives power through a trailing cable?
   3. What is the maximum tramming speed permitted for a continuous miner?
   4. What is the minimum distance from the interior of an enclosure to the edge of a bolt hole (more than 124 cubic inches)?
4. .003 inch.
   1. What is the maximum-sized opening permitted for a plane flange joint?
   2. What is the minimum thread engagement of bolts for an enclosure which is greater than 124 inches?
   3. What is the maximum tramming speed permitted for a continuous miner?
   4. What is the maximum radial clearance that should be allowed when installing a typical plug for spare lead entrance holes?
5. Be made of a non-sparking material.
   1. Inspection covers or screw type joints must be:
   2. A flat metal to metal joint is a:
   3. If trailing cables are run over by mobile face equipment:
   4. Battery-box covers must meet all of the following requirements, EXCEPT:
6. 0.005 inch.
   1. The primary function of a strain clamp is to:
   2. Most end bells on explosion-proof motors should be checked with a feeler gauge.
   3. To check a plane flange joint you would use what size feeler gauge?
   4. A No. 6 AWG trailing cable should be no longer than:
7. 2.5 MPH.
   1. What is the explosive range of methane?
   2. What is the maximum tramming speed permitted for a continuous miner?
   3. What is the minimum-sized trailing cable permitted for AC-powered mobile haulage units?
   4. What is the minimum size of asbestos packing material allowed?
8. Closed with specially designed fittings or plugs.
   1. A flat metal to metal joint is a:
   2. Inspection covers or screw type joints must be:
   3. All unused holes in permissible compartments must be:
   4. The purpose of hose conduit is to:
9. There's space for packing material to be placed around the cable.
   1. The primary purpose of a breather on explosion-proof compartments is:
   2. Stuffing boxes are drilled into the walls of the explosion-proof enclosures in such a way that:
   3. Battery-box covers must meet all of the following requirements, EXCEPT:
   4. Each bolt, stud or screw used to fasten a cover to an explosion-proof enclosure must be provided with a:
10. Mine operator.
    1. The maintenance required to keep equipment in permissible condition is the responsibility of the:
    2. Permissibility is required for electrical equipment and components:
    3. All unused holes in permissible compartments must be:
    4. The primary function of a strain clamp is to:
11. .004 inch.
    1. When a bolt hole in an explosion-proof enclosure is stripped out, it:
    2. When a bolt hole in an explosion-proof enclosure is stripped out, and re-tapping it to the next larger size:
    3. A plane flange joint has a maximum clearance between the box and the lid of:
    4. Plane flange joints on explosion-proof enclosures cannot exceed a separation distance of:
12. Inby the last open crosscut and in return air.
    1. If trailing cables are run over by mobile face equipment:
    2. Permissible compartments are designed to be:
    3. A permissible box must withstand an explosion pressure of:
    4. Permissibility is required for electrical equipment and components:
13. 1,000 feet.
    1. The maximum length permitted for trailing cables (4/0 and larger) is:
    2. A No. 6 AWG trailing cable should be no longer than:
    3. The minimum thickness of hose conduit allowed is:
    4. Trailing cables must be marked:
14. 25 amps
    1. In most cases, the length of a portable cable should not exceed:
    2. In low-and medium-voltage, three-phase AC systems, the maximum ground-fault tripping current should not exceed:
    3. All electric equipment used in return air outby the last open crosscut:
    4. When 1/4-inch packing is used in a stuffing box, the maximum allowable diametrical clearance between the cable and the holes in the stuffing box and the packing nut is:
15. Must be permissible.
    1. All unused holes in permissible compartments must be:
    2. Headlights used on permissible mining machines to provide illumination in the direction of travel:
    3. What minimum clearance must be maintained between the packing gland nut and the stuffing box?
    4. All bolts in a permissible enclosure must have:
16. It must be more than 25 feet from the machine (except cable reel).
    1. Which of the following is NOT a requirement of cables between machine components?
    2. Which of the following is a requirement of a temporary splice?
    3. Which of the following is NOT a requirement of a permanent splice?
    4. What is the most violent explosive percent of methane?
17. .005 inch.
    1. A .007-inch feeler gauge is used by an inspector to check:
    2. What is the minimum size of asbestos packing material allowed?
    3. What size feeler gauge should be used to check end bells on most motors?
    4. What size feeler gauge should be used to check plane flange joints?
18. A 3/16-inch diameter if round and 3/16 x 3/16-inch if square.
    1. What type of packing glands should be locked?
    2. What is the most violent explosive percent of methane?
    3. What is the minimum size of asbestos packing material allowed?
    4. How thick must lenses for headlights be?
19. 10%.
    1. What is the most violent explosive percent of methane?
    2. Which of the following is a requirement of a temporary splice?
    3. How thick must lenses for headlights be?
    4. Which of the following is a requirement of a permanent splice?
20. 1/2 inch.
    1. A flat metal to metal joint is a:
    2. The purpose of hose conduit is to:
    3. Permissible compartments are designed to be:
    4. How thick must lenses for headlights be?
21. 5% to 15%.
    1. What is the most violent explosive percent of methane?
    2. Trailing cables must be marked:
    3. What is the explosive range of methane?
    4. What type of packing glands should be locked?
22. Arcing or sparking could result which, in turn, could set off an explosion or cause a fire.
    1. Trailing cables must be marked:
    2. All trailing cables and drop cables must have:
    3. Conduit hose must be marked flame resistant:
    4. If trailing cables are run over by mobile face equipment:
23. A cable reel.
    1. Flame resistant as applied to trailing cables and hose conduit means:
    2. All mobile equipment that is powered by a trailing cable and travels in excess of 2.5 mph must be provided with:
    3. "Flame-resistant," as applied to trailing cables and conduit hose, means:
    4. The maximum length permitted for trailing cables (4/0 and larger) is:
24. To allow harmful gases that cause corrosion to escape.
    1. The maximum operating temperature of the external surface of a machine is:
    2. The primary purpose of a breather on explosion-proof compartments is:
    3. The primary function of a strain clamp is to:
    4. All unused holes in permissible compartments must be:
25. Must be lined with a flame-resistant insulating material preferably bonded to the inside of the cover.
    1. Trailing cables must be marked:
    2. Battery box covers:
    3. Conduit hose is used for:
    4. Battery boxes:
26. 7/16 inch.
    1. What is the maximum allowable speed of travel of a machine that receives power through a trailing cable?
    2. What is the minimum distance that a 1/2-inch bolt can extend into the threaded portion of the hole on a permissible enclosure?
    3. What is the minimum thread engagement of bolts for an enclosure which is greater than 124 inches?
    4. What is the minimum distance from the interior of an enclosure to the edge of a bolt hole (more than 124 cubic inches)?
27. Drainage holes.
    1. What is the most violent explosive percent of methane?
    2. What is the explosive range of methane?
    3. What should be provided in the bottom of each battery box?
    4. What is the minimum size of asbestos packing material allowed?
28. 150 Centigrade or 302 Fahrenheit.
    1. The minimum clearance between the shoulder of the nut and the top of a stuffing box in a properly packed, standard packing gland is:
    2. What is the maximum tramming speed permitted for a continuous miner?
    3. The maximum clearance between the lid and the box of a step-flange joint is:
    4. The maximum operating temperature of the external surface of a machine is:
29. 6 inches.
    1. What is the minimum-sized trailing cable permitted for AC-powered mobile haulage units?
    2. What is the minimum distance from combustible material that unattended enclosed motors, rectifiers, and transformers may be placed?
    3. What is the maximum-sized spacing permitted for bolts securing enclosure covers with joints all in one plane?
    4. What is the maximum-sized clearance of a plane flange joint on a shuttle car allowed by law?
30. 1/2 inch.
    1. Flame resistant as applied to trailing cables and hose conduit means:
    2. What is the maximum radial clearance that should be allowed when installing a typical plug for spare lead entrance holes?
    3. The maximum length permitted for trailing cables (4/0 and larger) is:
    4. The minimum amount of packing that should be in a packing gland along a conductor is:
31. 2.5 mph
    1. The maintenance required to keep equipment in permissible condition is the responsibility of the:
    2. Which of the following is NOT a requirement of a permanent splice?
    3. Permissible electric face equipment is defined as:
    4. A cable reel is required on self-propelled equipment that travels at a speed exceeding:
32. An approved packing material.
    1. Packing material used in stuffing boxes should be:
    2. Conduit hose is used for:
    3. Inspection covers or screw type joints must be:
    4. A screw type joint cannot be used if:
33. Screw type joint.
    1. The minimum thickness of hose conduit allowed is:
    2. All mobile equipment that is powered by a trailing cable and travels in excess of 2.5 mph must be provided with:
    3. A permissible box must withstand an explosion pressure of:
    4. A permissible joint that is made of a large screw with five or six threads is called a:
34. Is no longer considered permissible
    1. When a bolt hole in an explosion-proof enclosure is stripped out, it:
    2. 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?
    3. What is the most violent explosive percent of methane?
    4. When a bolt hole in an explosion-proof enclosure is stripped out, and re-tapping it to the next larger size:
35. It must be vulcanized.
    1. What is the minimum size of asbestos packing material allowed?
    2. Which of the following is a requirement of a permanent splice?
    3. If trailing cables are run over by mobile face equipment:
    4. Which of the following is NOT a requirement of a temporary splice made in a trailing cable?
36. Do spark but will not ignite a methane-air mixture
    1. If trailing cables are run over by mobile face equipment:
    2. The term "intrinsically safe circuits" refers to circuits that:
    3. All trailing cables and drop cables must have:
    4. The primary function of a strain clamp is to:
37. 550 feet
    1. A No. 6 AWG trailing cable should be no longer than:
    2. What is the explosive range of methane?
    3. A .007-inch feeler gauge is used by an inspector to check:
    4. Cable grips or insulated clamps shall be provided on:
38. Specifications set forth by the Secretary.
    1. Permissibility is required for electrical equipment and components:
    2. Before electric face equipment is deemed permissible, the equipment must meet the:
    3. Electrical components that normally arc during operation:
    4. All unused holes in permissible compartments must be:
39. At least 1/2 inch.
    1. What is the explosive range of methane?
    2. Which of the following is allowed to be under a permissible bolt?
    3. How should hose conduit be marked to indicate it is flame-resistant?
    4. How far should a 1/2-inch bolt extend into the threaded portion of the hole?
40. 3/16 inch.
    1. Conduit hose is used for:
    2. The minimum thickness of hose conduit allowed is:
    3. A screw type joint cannot be used if:
    4. Trailing cables must be marked:
41. Relieve pressure, ventilate, or drain.
    1. The number of temporary splices permitted in a single length of trailing cable is:
    2. Breathers or pressure-relief devices are installed on an explosion-proof enclosure to:
    3. A permissible box must withstand an explosion pressure of:
    4. 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?
42. Portable trailing cables.
    1. The purpose of hose conduit is to:
    2. Cable grips or insulated clamps shall be provided on:
    3. All bolts in a permissible enclosure must have:
    4. A screw type joint cannot be used if:
43. Every three feet.
    1. A flat metal to metal joint is a:
    2. What is the explosive range of methane?
    3. Trailing cables must be marked:
    4. Conduit hose must be marked flame resistant:
44. 0.004 inch.
    1. A flat metal to metal joint is a:
    2. Plane flange joints and step flange joints are the types of joints formed:
    3. Flame resistant as applied to trailing cables and hose conduit means:
    4. A plane flange joint has a maximum clearance between the box and the lid of:
45. Flame-resistant.
    1. Trailing cables must be marked:
    2. All trailing cables and drop cables must have:
    3. Conduit hose is used for:
    4. When mounting ground wires:
46. Have at least 3 power wires and one ground wire.
    1. When a trailing cable is used to power an underground mining machine, that machine must not move faster than:
    2. All trailing cables used to conduct electrical energy to face equipment shall conform to the following EXCEPT:
    3. If trailing cables are run over by mobile face equipment:
    4. Permissible electric face equipment is defined as:
47. 3/8 inch.
    1. What is the minimum distance a 1/2-inch bolt can extend into the threaded portion of the hole of a permissible enclosure?
    2. What is the maximum-sized opening permitted for a plane flange joint?
    3. What is the minimum thread engagement of bolts for an enclosure which is greater than 124 inches?
    4. What is the minimum distance that a 1/2-inch bolt can extend into the threaded portion of the hole on a permissible enclosure?
48. Explosion proof.
    1. Conduit hose is used for:
    2. Permissible electrical equipment is equipment which:
    3. Permissible compartments are designed to be:
    4. A flat metal to metal joint is a:
49. Provide for mechanical protection.
    1. When mounting ground wires:
    2. The purpose of hose conduit is to:
    3. Battery box covers:
    4. The minimum thickness of hose conduit allowed is:
50. An improper assembly.
    1. The primary function of a strain clamp is to:
    2. The use of bolts with more than one lock washer in a control panel box is considered:
    3. Tools or switches held in the operators hand or supported against his body:
    4. The minimum amount of packing that should be in a packing gland along a conductor is:
51. 1/2 inch.
    1. What is the minimum size of asbestos packing material allowed?
    2. How far should a 1/2-inch bolt extend into the threaded portion of the hole?
    3. What is the minimum distance a 1/2-inch bolt can extend into the threaded portion of the hole of a permissible enclosure?
    4. What is the minimum thread engagement of bolts for an enclosure which is greater than 124 inches?
52. Must be permissible.
    1. A .007-inch feeler gauge is used by an inspector to check:
    2. All electric equipment used in return air outby the last open crosscut:
    3. All unused holes in permissible compartments must be:
    4. Before electric face equipment is deemed permissible, the equipment must meet the:
53. 150 degrees Centigrade.
    1. The maximum speed of travel of a machine receiving power from a trailing cable.
    2. The minimum thickness of hose conduit allowed is:
    3. The maximum surface temperature of all components on machines approved under Schedule 2G is:
    4. In most cases, the length of a portable cable should not exceed:
54. Threaded in snug and locked in place.
    1. Trailing cables must be marked:
    2. Inspection covers or screw type joints must be:
    3. Conduit hose must be marked flame resistant:
    4. All unused holes in permissible compartments must be:
55. The cover must be replaced.
    1. What type of packing glands should be locked?
    2. If there are damaged threads on a screw-type cover:
    3. Permissible compartments are designed to be:
    4. Trailing cables must be marked:
56. Drill a hole through and use a nut and bolt.
    1. A permissible box must withstand an explosion pressure of:
    2. All unused holes in permissible compartments must be:
    3. 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?
    4. 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?
57. Which moves faster than 2.5 mph must be equipped with cable reels.
    1. If trailing cables are run over by mobile face equipment:
    2. Any underground machine traveling faster than how many MPH must be equipped with a cable reel?
    3. To protect the trailing cable from being run over by mobile equipment,all self-propelled equipment:
    4. Permissible electrical equipment is equipment which:
58. Drill hole through and use bolt nut.
    1. When a bolt hole in an explosion-proof enclosure is stripped out, it:
    2. 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?
    3. 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?
    4. What is the minimum distance from the interior of an enclosure to the edge of a bolt hole (more than 124 cubic inches)?
59. Always use terminals or clamps.
    1. Battery boxes:
    2. When mounting ground wires:
    3. Conduit hose is used for:
    4. A flat metal to metal joint is a:
60. .007 inch.
    1. Most end bells on explosion-proof motors should be checked with a feeler gauge.
    2. End bells on motors and reset switches are typical examples of:
    3. In most cases, the length of a portable cable should not exceed:
    4. To check a step flange joint you should use what size feeler gauge?
61. .007 inch.
    1. A .005-inch feeler gauge is used to check:
    2. What size feeler gauge should be used to check plane flange joints?
    3. What should be provided in the bottom of each battery box?
    4. What size feeler gauge should be used to check end bells on most motors?
62. It must be mechanically strong with adequate conductivity.
    1. Permissible electric face equipment is defined as:
    2. Which of the following is NOT a requirement of a permanent splice?
    3. Which of the following is a requirement of a permanent splice?
    4. If the cover of the permissible compartment has a step shape, it is:
63. It must be mechanically strong and well-insulated.
    1. What is the explosive range of methane?
    2. Which of the following is a requirement of a temporary splice?
    3. Permissible electrical equipment is equipment which:
    4. Which of the following is NOT a requirement of a temporary splice made in a trailing cable?
64. Flame-resistant.
    1. A No. 6 AWG trailing cable should be no longer than:
    2. Which of the following is a requirement of a permanent splice?
    3. Electrical components that normally arc during operation:
    4. Material that will burn when held in a flame but will cease burning when the flame is removed is defined as:
65. Short-circuit protection in an explosion-proof enclosure.
    1. Which of the following is a requirement of a permanent splice?
    2. Which of the following is a requirement of a temporary splice?
    3. Each wire or cable leaving a battery box on storage battery operated equipment shall have:
    4. If trailing cables are run over by mobile face equipment:
66. Step flange joints.
    1. A permissible box must withstand an explosion pressure of:
    2. Cable grips or insulated clamps shall be provided on:
    3. If trailing cables are run over by mobile face equipment:
    4. End bells on motors and reset switches are typical examples of:
67. .004 inch.
    1. What is the maximum allowable speed of travel of a machine that receives power through a trailing cable?
    2. What is the maximum-sized clearance of a plane flange joint on a shuttle car allowed by law?
    3. What is the maximum-sized spacing permitted for bolts securing enclosure covers with joints all in one plane?
    4. What is the maximum radial clearance that should be allowed when installing a typical plug for spare lead entrance holes?
68. Lock washer to help hold it in position.
    1. The primary purpose of a breather on explosion-proof compartments is:
    2. What is the most violent explosive percent of methane?
    3. When a bolt hole in an explosion-proof enclosure is stripped out, it:
    4. Each bolt, stud or screw used to fasten a cover to an explosion-proof enclosure must be provided with a:
69. Plane Flange Joint.
    1. A flat metal to metal joint is a:
    2. Battery box covers:
    3. The purpose of hose conduit is to:
    4. Trailing cables must be marked:
70. 150 psi.
    1. A permissible box must withstand an explosion pressure of:
    2. Permissible electrical equipment is equipment which:
    3. A screw type joint cannot be used if:
    4. Permissible electric face equipment is defined as:
71. Equipment which has been tested and approved.
    1. Permissible electric face equipment is defined as:
    2. Conduit hose is used for:
    3. The minimum thickness of hose conduit allowed is:
    4. Permissible electrical equipment is equipment which:
72. Closing with hand pressure and opening if pressure is released.
    1. If there are damaged threads on a screw-type cover:
    2. How thick must lenses for headlights be?
    3. All unused holes in permissible compartments must be:
    4. The "dead-man" type switch on a hand-held tool functions by:
73. Must be placed in explosion-proof enclosures before they are considered "permissible."
    1. Cable grips or insulated clamps shall be provided on:
    2. Since certain electrical components almost always spark when in operation, they:
    3. Permissible electrical equipment is equipment which:
    4. Permissible compartments are designed to be:
74. 2 feet.
    1. What is the minimum distance from combustible material that unattended enclosed motors, rectifiers, and transformers may be placed?
    2. What is the minimum size of asbestos packing material allowed?
    3. What is the minimum distance a 1/2-inch bolt can extend into the threaded portion of the hole of a permissible enclosure?
    4. What is the maximum allowable speed of travel of a machine that receives power through a trailing cable?
75. 6 MPH.
    1. The maximum clearance between the lid and the box of a step-flange joint is:
    2. What is the minimum size of asbestos packing material allowed?
    3. The maximum speed of travel of a machine receiving power from a trailing cable.
    4. The maximum clearance of a plane flange joint allowed for permissibility is:
76. Must be explosion-proof
    1. Which of the following is allowed to be under a permissible bolt?
    2. If trailing cables are run over by mobile face equipment:
    3. All electric equipment used in return air outby the last open crosscut:
    4. An electric motor that is a power source for a permissible mining machine:
77. Equal to or greater than the diameter of the bolt.
    1. What size feeler gauge should be used to check plane flange joints?
    2. All electric equipment used in return air outby the last open crosscut:
    3. What size feeler gauge should be used to check end bells on most motors?
    4. When a bolt with a diameter larger than 3/8-inch is used, thread engagement should be:
78. Is similar in all respects to that which has been approved by the USBM.
    1. Conduit hose is used for:
    2. When mounting ground wires:
    3. Trailing cables must be marked:
    4. Permissible electrical equipment is equipment which:
79. No.6 AWG.
    1. What is the maximum-sized spacing permitted for bolts securing enclosure covers with joints all in one plane?
    2. What is the maximum tramming speed permitted for a continuous miner?
    3. What is the minimum-sized trailing cable permitted for AC-powered mobile haulage units?
    4. What is the minimum size of asbestos packing material allowed?
80. 300 volts DC or AC.
    1. If the cover of the permissible compartment has a step shape, it is:
    2. All mobile equipment that is powered by a trailing cable and travels in excess of 2.5 mph must be provided with:
    3. 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:
    4. A permissible joint that is made of a large screw with five or six threads is called a:
81. .004 inch.
    1. What size feeler gauge should be used to check plane flange joints?
    2. What is the maximum tramming speed permitted for a continuous miner?
    3. What is the maximum-sized opening permitted for a plane flange joint?
    4. What is the maximum-sized spacing permitted for bolts securing enclosure covers with joints all in one plane?
82. 40 volts.
    1. Trailing cables must be marked:
    2. The purpose of hose conduit is to:
    3. The frame to ground potential of any off-track machine must not exceed:
    4. If trailing cables are run over by mobile face equipment:
83. Should be mechanically tight and sealed or padlocked.
    1. Permissible electrical equipment is equipment which:
    2. The minimum thickness of hose conduit allowed is:
    3. What is the explosive range of methane?
    4. Because of the electrical wiring inside headlights, the lens rings:
84. 1/2 inch.
    1. What is the minimum distance from combustible material that unattended enclosed motors, rectifiers, and transformers may be placed?
    2. What is the minimum distance that a 1/2-inch bolt can extend into the threaded portion of the hole on a permissible enclosure?
    3. What is the maximum radial clearance that should be allowed when installing a typical plug for spare lead entrance holes?
    4. What is the maximum tramming speed permitted for a continuous miner?
85. 1/2-inch thick tempered glass.
    1. Lenses for headlights used on mining machines must be constructed of glass or other suitable material with physical characteristics:
    2. All electric equipment used in return air outby the last open crosscut:
    3. Headlights used on permissible mining machines to provide illumination in the direction of travel:
    4. Plane flange joints and step flange joints are the types of joints formed:
86. The mechanical protection of a cable.
    1. Conduit hose is used for:
    2. Battery box covers:
    3. Battery boxes:
    4. A flat metal to metal joint is a:
87. 500 feet.
    1. Trailing cables must be marked:
    2. A screw type joint cannot be used if:
    3. All trailing cables and drop cables must have:
    4. In most cases, the length of a portable cable should not exceed:
88. Must be properly enclosed to be considered permissible.
    1. Electrical components that normally arc during operation:
    2. The primary function of a strain clamp is to:
    3. A flat metal to metal joint is a:
    4. The purpose of hose conduit is to:
89. 0.004 inch.
    1. To check a plane flange joint you would use what size feeler gauge?
    2. What is the maximum-sized clearance of a plane flange joint on a shuttle car allowed by law?
    3. Which of the following is allowed to be under a permissible bolt?
    4. The maximum clearance of a plane flange joint allowed for permissibility is:
90. 2.5 MPH
    1. To protect the trailing cable from being run over by mobile equipment,all self-propelled equipment:
    2. Each wire or cable leaving a battery box on storage battery operated equipment shall have:
    3. Any underground machine traveling faster than how many MPH must be equipped with a cable reel?
    4. If trailing cables are run over by mobile face equipment:
91. Insulated bushings.
    1. Insulated wires should pass through metal walls of electric compartments only through:
    2. What should be provided in the bottom of each battery box?
    3. Permissible electrical equipment is equipment which:
    4. Battery-box covers must meet all of the following requirements, EXCEPT:
92. Must be flame-resistant.
    1. To meet the requirements of Schedule 2G, all conduit hose on equipment:
    2. The purpose of hose conduit is to:
    3. All electric equipment used in return air outby the last open crosscut:
    4. The minimum thickness of hose conduit allowed is:
93. 7/16 of an inch of metal from the interior of the enclosure to the closest edge of the hole must be maintained.
    1. When a bolt hole in an explosion-proof enclosure is stripped out, and re-tapping it to the next larger size:
    2. Plane flange joints on explosion-proof enclosures cannot exceed a separation distance of:
    3. The maximum operating temperature of the external surface of a machine is:
    4. Permissibility is required for electrical equipment and components:
94. 0.006 inch.
    1. The maximum clearance of a plane flange joint allowed for permissibility is:
    2. What is the maximum-sized opening permitted for a plane flange joint?
    3. The minimum thickness of hose conduit allowed is:
    4. The maximum clearance between the lid and the box of a step-flange joint is:
95. So maintenance personnel can more readily check for damaged or worn parts.
    1. Control panels and electrical motors are equipped with access openings and inspection covers:
    2. Because of the electrical wiring inside headlights, the lens rings:
    3. The maintenance required to keep equipment in permissible condition is the responsibility of the:
    4. Cast or welded enclosures should be designed to withstand a minimum internal pressure of:
96. When two pieces of metal come together.
    1. A plane flange joint has a maximum clearance between the box and the lid of:
    2. Plane flange joints and step flange joints are the types of joints formed:
    3. Permissible compartments are designed to be:
    4. A screw type joint cannot be used if:
97. 150 PSI.
    1. What size feeler gauge should be used to check end bells on most motors?
    2. Most end bells on explosion-proof motors should be checked with a feeler gauge.
    3. A .007-inch feeler gauge is used by an inspector to check:
    4. Cast or welded enclosures should be designed to withstand a minimum internal pressure of:
98. It will burn when held in a flame but will cease when the flame is removed.
    1. What is the most violent explosive percent of methane?
    2. If there are damaged threads on a screw-type cover:
    3. The purpose of hose conduit is to:
    4. Flame resistant as applied to trailing cables and hose conduit means:
99. 0.007 inch.
    1. What is the explosive range of methane?
    2. Packing material used in stuffing boxes should be:
    3. To check a step flange joint you should use what size feeler gauge?
    4. The primary function of a strain clamp is to:
100. 1/8 inch.
     1. The maximum clearance between the lid and the box of a step-flange joint is:
     2. The minimum clearance between the shoulder of the nut and the top of a stuffing box in a properly packed, standard packing gland is:
     3. What is the minimum distance from the interior of an enclosure to the edge of a bolt hole (more than 124 cubic inches)?
     4. The minimum amount of packing that should be in a packing gland along a conductor is:
101. No.4 AWG
     1. What is the minimum-sized trailing cable permitted for AC-powered mobile haulage units?
     2. The minimum-sized trailing cable permitted for direct current powered mobile haulage units is:
     3. The minimum thickness of hose conduit allowed is:
     4. The maximum speed of travel of a machine receiving power from a trailing cable.
102. ICEA standards
     1. Inspection covers or screw type joints must be:
     2. How thick must lenses for headlights be?
     3. The primary function of a strain clamp is to:
     4. Conductors must have current-carrying capacities that meet:
103. 6 mph.
     1. When a bolt hole in an explosion-proof enclosure is stripped out, it:
     2. When a trailing cable is used to power an underground mining machine, that machine must not move faster than:
     3. If trailing cables are run over by mobile face equipment:
     4. Trailing cables must be marked:
104. Flame-resistant USBM - Not exceeding 3 feet.
     1. What should be provided in the bottom of each battery box?
     2. Conductors must have current-carrying capacities that meet:
     3. How should hose conduit be marked to indicate it is flame-resistant?
     4. How thick must lenses for headlights be?
105. The threads are damaged.
     1. A screw type joint cannot be used if:
     2. What type of packing glands should be locked?
     3. Conduit hose is used for:
     4. All trailing cables and drop cables must have:
106. All glands
     1. Permissible compartments are designed to be:
     2. Trailing cables must be marked:
     3. What type of packing glands should be locked?
     4. The purpose of hose conduit is to:
107. Lock washers.
     1. Which of the following is NOT a requirement of cables between machine components?
     2. A screw type joint cannot be used if:
     3. Which of the following is NOT a requirement of a permanent splice?
     4. Which of the following is allowed to be under a permissible bolt?
108. Tightening the packing gland nut.
     1. The packing material in a stuffing box is compressed tightly against the cable by:
     2. To check a step flange joint you should use what size feeler gauge?
     3. A .007-inch feeler gauge is used by an inspector to check:
     4. Inspection covers or screw type joints must be:
109. One.
     1. The number of temporary splices permitted in a single length of trailing cable is:
     2. Because of the electrical wiring inside headlights, the lens rings:
     3. The maximum length permitted for trailing cables (4/0 and larger) is:
     4. The primary function of a strain clamp is to:
110. Lock washer.
     1. A flat metal to metal joint is a:
     2. The purpose of hose conduit is to:
     3. A screw type joint cannot be used if:
     4. All bolts in a permissible enclosure must have:
111. Must be adequately ventilated.
     1. A flat metal to metal joint is a:
     2. When mounting ground wires:
     3. Battery boxes:
     4. Trailing cables must be marked:
112. Plane flange joints.
     1. A screw type joint cannot be used if:
     2. A .007-inch feeler gauge is used by an inspector to check:
     3. A .005-inch feeler gauge is used to check:
     4. The purpose of hose conduit is to:
113. Transfer most of the strain from the trailing cable to the frame of the equipment it feeds.
     1. If there are damaged threads on a screw-type cover:
     2. The primary function of a strain clamp is to:
     3. Conduit hose is used for:
     4. The minimum thickness of hose conduit allowed is:
114. 1/8 inch.
     1. What size feeler gauge should be used to check plane flange joints?
     2. When 1/4-inch packing is used in a stuffing box, the maximum allowable diametrical clearance between the cable and the holes in the stuffing box and the packing nut is:
     3. What is the maximum tramming speed permitted for a continuous miner?
     4. When a standard packing gland is properly packed, the minimum clearance permitted between the shoulder of the packing nut and the top of the stuffing box is:
115. They must be less than 6 feet in length.
     1. Which of the following is a requirement of a permanent splice?
     2. Which of the following is NOT a requirement of cables between machine components?
     3. Which of the following is a requirement of a temporary splice?
     4. Which of the following is NOT a requirement of a permanent splice?
116. Cables and hose will burn when held in a flame, but will cease burning when removed from flame.
     1. In most cases, the length of a portable cable should not exceed:
     2. "Flame-resistant," as applied to trailing cables and conduit hose, means:
     3. A No. 6 AWG trailing cable should be no longer than:
     4. All trailing cables and drop cables must have:
117. 1/8 inch.
     1. Headlights used on permissible mining machines to provide illumination in the direction of travel:
     2. The maximum clearance between the lid and the box of a step-flange joint is:
     3. What minimum clearance must be maintained between the packing gland nut and the stuffing box?
     4. What is the maximum-sized opening permitted for a plane flange joint?
118. Step flange joints.
     1. All trailing cables and drop cables must have:
     2. Conduit hose is used for:
     3. A .007-inch feeler gauge is used by an inspector to check:
     4. A flat metal to metal joint is a:
119. Cannot have a nameplate voltage rating of more than 300 volts.
     1. Tools or switches held in the operators hand or supported against his body:
     2. 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:
     3. Which of the following is allowed to be under a permissible bolt?
     4. All unused holes in permissible compartments must be:
120. 3/16 inch.
     1. What is the maximum-sized opening permitted for a plane flange joint?
     2. What type of packing glands should be locked?
     3. A .007-inch feeler gauge is used by an inspector to check:
     4. When 1/4-inch packing is used in a stuffing box, the maximum allowable diametrical clearance between the cable and the holes in the stuffing box and the packing nut is: