It seems like you're referring to a technical assessment or quiz on drilling tools and machines. I can help you with answers.
41. What is the type of the reamer?
Answer: D. Machine reamer
42. Which type of abrasive removes heavy stock of material?
Answer: The question seems incomplete as there is no options for this.
43. Reamer is used for:
Answer: C. Finish hole
44. What is the name labeled as 1,2,and 3?
Answer: A. Base plate, angle plate, and surface gage respectively
45. Which device is used to hold straight shank drill?
Answer: B. Chuck
46. Which drilling machine used to drill small diameter holes up to 6mm?
Answer: B. Pneumatic hand drill
47. Which drilling machine achieves various spindle speeds by changing the belt position?
Answer: A. Pillar drilling machine