Projection engineering (Jan-Dec 1931)

MAY, 1931 Page 23 Examination questions for projectionists Herewith is presented a list of guiding questions which applicants for grade A projectionist licenses in Canada are expected to be prepared to answer correctly ALL projectionists, no matter where located, should study these questions. The information necessary to answer the questions may be gained from back issues of Projection Engineering, from instruction books and from J. R. Cameron's text books. i. What are the requirements regarding construction of projection rooms? 2. What dimensions are required? 3. How must port-hole openings be covered or protected? 4. What area of ventilation is required for projection and rewind rooms, and where must vent pipes lead to? 5. What entrance and exits are required in projection room? 6. What is the fire fighting equipment required, and where must the units be located? 7. How often should port-hole shutters be tested? 8. What is the maximum footage of film permitted to be used on a standard 10 inch reel? 9. Where must all films be rewound? 10. How large a rewind room is required ? 11. Where must all film not in the projector be kept? 12. What are the toilet requirements? 13. What effect will the placing of the projection room above the center of the screen have on the shape of the picture? 14. Is it advisable to place glass in observation ports, and if so, why? 15. How should glass be placed in observation port to avoid reflection? 16. What is meant by overloading a reel? 17. When should film be revised? 18. Would you use water on a film fire? 19. Should film be stored in projection magazine when not in use? 20. Describe the methods by which dry and brittle film may be cleaned and re-moistened. 21. What constitutes one reel of film ? 22. Where should all films be rewound ? 23. Why should both ends of the rewinders be in line with each other? 24. Where should all film scraps from repairs be placed, and give reasons ? 25. What is meant by "pulling down" when rewinding? 26. Give nature of damage to film caused by "pulling down" film at rewinding ? 2y. Describe how to make a splice in film. 28. What are some reasons for film fires in projectors? 29. What will cause film to stop or pile up at the aperture opening or in front of the light beam? 30. What are the results of large film loops? 31. What damage may result from a wide, stiff or out-of-line splice? 32. What will unequal gate springs or traps do to the film? 2,Z If sprocket idler rollers are outof-line or binding, what may happen to the film? 34. What happens to the film if the top magazine reel shaft is tight? 35. What film or other damage results from dirty magazine rollers? 36. Why are new prints waxed and old prints not? 37. What effect has overloading a reel on the film ? 38. Why should a blank leader and tail piece be attached to each reel of film? 39. What is film buckling? 40. What will cause film to buckle? 41. What will the effect be on the screen if the film buckles? 42. What effect will an over scraped film splice have? 43. Name some causes for rain effect on film. 44. What causes corners of sprocket holes to become cracked? 45. Name several faults in a projector which will cause damage to a film. 46. Supposing a fire gets into top magazine what would you do? 47. What may cause film to jump sprockets ? 48. Does the use of bent and broken reels damage film, and if so, how? 49. How is the speed of reels in magazines regulated? 50. What is the cause of flicker? 51. When the picture size is increased, without other changes, will there be apparent loss of light on the screen ? 52. What harm results from dirty sprockets ? 53. What causes white streaks both up and down from letters or titles? 54. What causes emulsion to collect on the aperture shoes and what damage may it do? 55. What will cause film to have an up and down movement on the screen? 56. What causes film sprocket holes to be pulled or broken out at the sides ? 57. What is a mis-frame? 58. What would you do in the event of the projector binding up? 59. Of what use is film gate tension and how would you adjust same? 60. Name the parts and function of the intermittent movement. 61. What is travel ghost? Tell how to correct it. 62. If a decided flicker is noticeable at a speed of 90 feet a minute, what can be done to lessen the flicker ? 63. What damage is caused by overtight magazine take-up tension and how can it be overcome? 64. What causes loss of lower loop? 65. Describe the various parts of the projector that are provided for fire prevention. 66. What would cause the intermittent sprocket to stand still while the rest of the projector mechanism is in motion ? 6y. What are the uses of the idler rollers and what is their proper adjustment? 68. Explain purpose of film gate idlers. 69. What purpose do film gate tension springs serve? 70. What effect on the picture image will worn aperture plate tracks have ? 71. What is the requirement for the fire shutter on projectors? 72. Why is a revolving shutter used on a projector? 73. What will cause hooked sprocket teeth ? 74. What would you use to clean the projector after an aperture fire? 75. Can and should sprockets be reversed when they show wear? 76. Which make of a projector has