. Trade tests; the scientific measurement of trade proficiency . PICTURE 2 5. Q. What is that man doing?A. Caulking. 6. Q. What is that operation for? A. (i) Make it steam tight (stop leak). (2) Tighten sheet. (One sufficient) 7. Q. What must you usually do to the edge of a sheet before caulking it?A. (i) Chip. (2) Bevel. (One sufficient) 238 TRADE TESTS 8. Q. A. Q. A. What may happen if the holding rivets are too far fromthe edge of the sheet? (i) Cause leakage. (2) Caulking edge (lap) lift (sheet turn up). (3) Drive sheet off ring. (4) Undermine sheet (sheet loosen). (One sufficient)What par
. Trade tests; the scientific measurement of trade proficiency . PICTURE 2 5. Q. What is that man doing?A. Caulking. 6. Q. What is that operation for? A. (i) Make it steam tight (stop leak). (2) Tighten sheet. (One sufficient) 7. Q. What must you usually do to the edge of a sheet before caulking it?A. (i) Chip. (2) Bevel. (One sufficient) 238 TRADE TESTS 8. Q. A. Q. A. What may happen if the holding rivets are too far fromthe edge of the sheet? (i) Cause leakage. (2) Caulking edge (lap) lift (sheet turn up). (3) Drive sheet off ring. (4) Undermine sheet (sheet loosen). (One sufficient)What part of the boiler is that man working on? (i) Mud ring. (2) Right front corner. (One sufficient). PICTURE 3 10. Q. What do you call that tool?A. (i) Expander. (2) Prosser. (One sufficient; 11. Q. At what point on fig. 5 would that tool be applied? A. (i) G(K). (2) Firebox end. (3) Rear (back) end (of flue). (One sufficient) 12. Q. What risk is there in using that tool on running repairs? A. (i) Break (crack) (fracture) tubes, (2) Burst flues. (One sufficient) THE PICTURE TRADE TEST METHOD 239
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