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120 Multiple choice questions
- A restraining clamp in permissible condition.
- A step flange joint.
- 6 mph.
- .003 inch.
- Be made of a non-sparking material.
- 0.005 inch.
- 2.5 MPH.
- Closed with specially designed fittings or plugs.
- There's space for packing material to be placed around the cable.
- Mine operator.
- .004 inch.
- Inby the last open crosscut and in return air.
- 1,000 feet.
- 25 amps
- Must be permissible.
- It must be more than 25 feet from the machine (except cable reel).
- .005 inch.
- A 3/16-inch diameter if round and 3/16 x 3/16-inch if square.
- 10%.
- 1/2 inch.
- 5% to 15%.
- Arcing or sparking could result which, in turn, could set off an explosion or cause a fire.
- A cable reel.
- To allow harmful gases that cause corrosion to escape.
- Must be lined with a flame-resistant insulating material preferably bonded to the inside of the cover.
- 7/16 inch.
- Drainage holes.
- 150 Centigrade or 302 Fahrenheit.
- 6 inches.
- 1/2 inch.
- 2.5 mph
- An approved packing material.
- Screw type joint.
- Is no longer considered permissible
- It must be vulcanized.
- Do spark but will not ignite a methane-air mixture
- 550 feet
- Specifications set forth by the Secretary.
- At least 1/2 inch.
- 3/16 inch.
- Relieve pressure, ventilate, or drain.
- Portable trailing cables.
- Every three feet.
- 0.004 inch.
- Flame-resistant.
- Have at least 3 power wires and one ground wire.
- 3/8 inch.
- Explosion proof.
- Provide for mechanical protection.
- An improper assembly.
- 1/2 inch.
- Must be permissible.
- 150 degrees Centigrade.
- Threaded in snug and locked in place.
- The cover must be replaced.
- Drill a hole through and use a nut and bolt.
- Which moves faster than 2.5 mph must be equipped with cable reels.
- Drill hole through and use bolt nut.
- Always use terminals or clamps.
- .007 inch.
- .007 inch.
- It must be mechanically strong with adequate conductivity.
- It must be mechanically strong and well-insulated.
- Flame-resistant.
- Short-circuit protection in an explosion-proof enclosure.
- Step flange joints.
- .004 inch.
- Lock washer to help hold it in position.
- Plane Flange Joint.
- 150 psi.
- Equipment which has been tested and approved.
- Closing with hand pressure and opening if pressure is released.
- Must be placed in explosion-proof enclosures before they are considered "permissible."
- 2 feet.
- 6 MPH.
- Must be explosion-proof
- Equal to or greater than the diameter of the bolt.
- Is similar in all respects to that which has been approved by the USBM.
- No.6 AWG.
- 300 volts DC or AC.
- .004 inch.
- 40 volts.
- Should be mechanically tight and sealed or padlocked.
- 1/2 inch.
- 1/2-inch thick tempered glass.
- The mechanical protection of a cable.
- 500 feet.
- Must be properly enclosed to be considered permissible.
- 0.004 inch.
- 2.5 MPH
- Insulated bushings.
- Must be flame-resistant.
- 7/16 of an inch of metal from the interior of the enclosure to the closest edge of the hole must be maintained.
- 0.006 inch.
- So maintenance personnel can more readily check for damaged or worn parts.
- When two pieces of metal come together.
- 150 PSI.
- It will burn when held in a flame but will cease when the flame is removed.
- 0.007 inch.
- 1/8 inch.
- No.4 AWG
- ICEA standards
- 6 mph.
- Flame-resistant USBM - Not exceeding 3 feet.
- The threads are damaged.
- All glands
- Lock washers.
- Tightening the packing gland nut.
- One.
- Lock washer.
- Must be adequately ventilated.
- Plane flange joints.
- Transfer most of the strain from the trailing cable to the frame of the equipment it feeds.
- 1/8 inch.
- They must be less than 6 feet in length.
- Cables and hose will burn when held in a flame, but will cease burning when removed from flame.
- 1/8 inch.
- Step flange joints.
- Cannot have a nameplate voltage rating of more than 300 volts.
- 3/16 inch.