31. What must be done when the highwall is cracked and shows evidence of movement or of weakening?

32. What must be done with the drill machine controls in the event of a power failure?

33. A welding cable must be splice-free within what distance of the electrode holder?

34. What requirements apply to guards installed on equipment in such a manner as to prevent accidental contact with moving parts?

35. What must be legibly marked on all lifting jacks and not exceeded?

36. Where is it permitted to cross over conveyor belts in motion?

37. How many apprentice miners may the mine foreman or assistant mine foreman have under their direct supervision at one time?

38. What is the maximum length of time a person may be employed as an apprentice miner before testing for a certificate of competency and qualification as an experienced surface miner?

39. How long after completing the 40 hour surface apprenticeship training program does a prospective miner have to pass the final examination?

40. Within what period of time does a prospective miner have to retake the apprentice miner's examination if not scoring at least 75 percent the first time?