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MMET 201 Final Exam- Questions & Answers
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MMET 201 Final Exam- Questions & Answers
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MMET 201 Final Exam- Questions &Answers
Serrated chips Correct Ans-called segmented or non homogeneous chips.
- Metals with low thermal conductivity and strength that decrease sharply with temperature
- such as titanium
Shear angle Correct Ans-influences force and power requirements, chip thickness, and
temperature
Sheets Correct Ans-have a thickness of less than 6 mm
Shielded Metal-Arc Welding (SMAW)(stick welding) Correct Ans-- 50% of all industrial and
maintenance welding currently is performed by this process.
- Electrode is consumable
small clearance implies that... Correct Ans-in BRAZING the molten braze metal will not fully
penetrate the interface
Solid-State Welding Processes Correct Ans-- joining takes place without fusion at the
interface of the two parts to be welded
- No liquid or molten phase is present in the joint.
,Specific cutting force Correct Ans-ratio of the cutting force to the cross sectional area being
cut (i.e., the product of width of cut and depth of cut)
Spreading decreases with... Correct Ans-additional rolls (in vertical axes) in contact with the
edges of the rolled product in the roll gap (edger mills)
Spreading in flat rolling increases with... Correct Ans-1. Decreasing width-to-thickness ratio
of the entering material
2. increasing friction
3. Decreasing ratio of the roll radius to the strip thickness
Spring back Correct Ans-plastic deformation is followed by some elastic recovery when the
load is removed
Spring back increases with Correct Ans-- Increasing the ratio R/T and the yield stress of the
material
-decreasing the elastic modulus
Steel Machinability Correct Ans-improved by adding lead and sulfur
Submerged-Arc Welding (SAW) Correct Ans-the weld arc is shielded by a granular flux
consisting of lime, silica, manganese oxide, calcium fluoride, and other compounds
- Electrode is consumable
, Superabrasives Correct Ans-1.Cubic boron nitride (cBN) 2.Diamond
Surface grinding Correct Ans-for flat surfaces
Temperature rise has adverse effects because: Correct Ans-1. it lowers the strength, hardness,
stiffness, and wear resistance of the cutting tools.
2. it causes uneven dimensional changes in the part being machined.
3. it can change properties of the machined surface because of metallurgical changes.
Thermoplastics Correct Ans-tools should be sharp. Cooling is necessary to keep chips from
becoming gummy and sticking to the tools
Thermosetting plastics Correct Ans-are brittle
Thermosetting Plastics and Ceramics Correct Ans-tend to produce discontinuous chips
because they are brittle materials
thread rolling Correct Ans-• A cold-forming process
• Straight or tapered threads are formed on round rods, by passing them between dies
Thread Rolling Advantages Correct Ans-1. generating threads without any loss of material
2. good strength
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