4-35. When timing the pressure lifting eccentric, you should set the sewing machine at 1. 3 1/2 SPI 2. 5 SPI 3. 8 SPI 4. 32 SPI 4-36. What is the purpose of the thread controller spring? 1. It prevents the bobbin thread from breaking 2. It prevents the upper thread from breaking 3. It prevents the sewing hook from piercing the thread 4. It prevents the needle from piercing the thread 4-37. Which of the following statements concerning the thread controller spring is correct? 1. It rests on the thread controller spring stop as the point of the needle enters the material 2. It rests on the thread controller spring stop as the needle reaches its highest point 3. It prevents the bobbin thread from jamming under the throat plate 4-38. When adjusting the thread tension and you cannot properly adjust it with the upper thread tension disc, what action should you take? 1. Change the size of thread 2. Change the needle size 3. Adjust the bobbin tension 4. Adjust the presser foot tension 4-39. If your machine is hard to turn after you time and adjust it, which of the following actions must be performed first? 1. Check the feeding action 2. Remove the arm shaft connection belt 3. Remove the throat plate and set the stitches to zero Learning Objective: Identify the functions, adjustments, timing and general maintenance applicable to the 31-15 sewing machine. 4-40. Which of the following is an oscillating type sewing machine? 1. 31-15 2. 331K1 3. Consew C-30 4. Each of the above 4-41. The 31-15 sewing machine will sew canvas up to 1. 4 oz 2. 6 oz 3. 8 oz 4. 10 oz 4-42. What is the stitch range on the Consew C-30? 1. 5 to 30 SPI 2. 7 to 32 SPI 3. 5 to 27 SPI 4. 7 to 27 SPI 4-43. What is the clearance between the presser foot and the throat plate at the 31-15 sewing machine? 1. One-fourth in. 2. One-eighth in. 3. Seven-sixteenths in. 4. Five-sixteenths in. 4-44. Which of the following is the main timing point on a 31-15 sewing machine? 1. Hook drive gear 2. Hook pinion gear 3. Needlebar 4. Balance wheel 4-45. When you set the needlebar and it starts its upstroke, what is the distance of the hook in relation to the eye of the needle? 1. One-sixteenth inch above 2. One-sixteenth inch below 3. One-eighth inch above 4. One-eighth inch below 4-46. To set the feeding action on a 31-15 sewing machine, you must loosen which of the following screws? 1. Feed dogs setscrew 2. Feed dog cam fork setscrew 3. Feed-driving rock shaft crank pinch screw 4. Feed-driving rock shaft connection pinch screw 18