q.1 : which of the two materuials do not respond well to induction hardening a) ferritic cast iron b) low carbon steel c) medium carbon steel d) pearlitic cast iron q.2 during solidification of cast iron graphatization is promoted by: a) high carbon content b) high cooling rate c) presence of Cr d) slow cooling rate. q3. spheroidal graphite is obtained in cast iron by: a) inoculating the melt with ferrosilicon b) adding nickel to the melt in form of round shots c) trending rhe metls of controlled composition with magenisum d) annealing of flake graphite cast irons q.4 : during recovery of a cold worked metal the dislocations a) multiply b ) largely disappear c) rearrange q.5: recrystallisation is more likely to occur if a material has first been a) cold worked b) melted c) recovered q.6 : the basic cause of grain growth is a) grain boundary energy b) small grains...
Quiz Your Learning: 1. The mean time to repair (MTTR) for a repairable system is 30 minutes. When maintenance time changes from 20 minutes to 40 minutes, the net increase in maintainability is closest to (A) 0.15 (B) 0.25 (C) 0.45 (D) 0.60 2. A 20 mm HSS drill with a point angle of 118 ̊ is used for drilling a through-hole on a metallic plate of thickness 100 mm with a cutting speed of 333.33 mm/s and feed of 0.22 mm/rev. Assuming that the drill is touching the surface of the plate at the start, the drilling time (in s) is closest to (A) 85 (B) 90 (C) 96 (D) 100 3. An acceptance sampling plan is selected with sample size n = 80, acceptance number c = 2 for a lot size of 10,000 units. The probability of accepting the lot is based on Poisson distribution. Assuming rectification inspection, if incoming lot quality p is 0.03 and mean (λ) is 2.4, the average outgoing quality (AOQ) is closest to (A) 0.0011 (B) 0.0087 (C) 0.0170 (D) ...
