POLISHING, BUFFING , LAPPING AND HONING MCQS
- Shear angle varies with
- Continuous chips are formed when machining
- A 5° taper over 5 mm length is to be made on a 100 mm diameter jobWhich method should be used ?
- Chip breakers are provided on cutting tools
- Tool life is said to be over when
- , In the Taylor equation T = C, value of index n is closely related to
- The relationship between the shear angle , friction angle 8 and cutting rake angle o, and the machining constant C for the work material is
- Wear limit on cutting tool is of the order of
- With high speed steel tools, the maximum safe operating temperature is of the order of
- To remove maximum material per minute with the same tool life
- The included angle between the land and the face of the tooth is called
- Acutting tool having tool signature as 10, 10, 6, 6, 8, 8, 2 will have back angle as
- The last element in the tool signature is
- As cutting speed increases, the built up edge
- Carbide tools wear out faster at
- Which of the following tools are harder and more wear resistant than tungsten carbide but are weaker in tension?
- Ceramic tips are prepared from
- Which of the following are cast alloys containing tungsten and chromium carbides in a matrix of cobalt and chromium ?
- Carbide tips are fixed to the shanks of cutting tools by
- The most wear-resistant grade of carbide used for cutting tools is the straight
- With increase in cutting speed, the finish
- When turning a long shaft on a lathe, its bending can be prevented by
- In oblique cutting system, the chip thickness is
- Finish is more affected by
- Best method of increasing the rate of removing metal
- The width of tape by which numerical control machines are controlled is
- Number of tracks on tape as per EIA standard are
- Photo-electric tape readers are capable of reading
- A block’ of information means
- Cemented carbide tools wear faster at
(a) different materials and with tool geometry
(b) cutting speed
(c) feed
(d) machine used
(e) none of the above.
different materials and with tool geometry
(a) ductile metal
(b) brittle material
(c) heat treated material
(d) with lot of pressure and heat against the tool
(e) none of the above.
ductile metal
(a) taper turning attachment
(b) tailstock offset method
(c) compound rest method
(d) form tool method
(e) any one of the above.
form tool method
(a) for safety of operator
(b) to minimise heat generation
(c) to permit easy access of coolant at tool point
(d) to permit short segmented chips
(e) to increase tool life.
to permit short segmented chips
(a) finish of work becomes too rough
(b) chips become blue
(c) chattering starts
(d) cutter looks dull
(e) a certain amount of wear or cratering occurs on the flank.
a certain amount of wear or cratering occurs on the flank.
(a) cutting tool material
(b) workpiece material
(c) working conditions
(d) temperature at chip tool interface
(e) none of the above.
workpiece material
(a) 20 +B-a = C
(b) 2a + B- = C
(c) 28 + o = OC
(d) 20 + a – ß = C
(e) 20 + o +B = C.
20 +B-a = C
(a) 0.2 mm
(b) 0.8 mm
(c) 1.6 nmm
(d) 2.5 mm
(e) none of the above.
0.8 mm
(a) 200°C
(b) 540°C
(c) 760°C
(d) 870°Co
(e) 1100°C
540°C
(a) increase depth of cut
(b) increase feed rate
(c) decrease cutting speed
(d) increase cutting speed
(e) all of the above.
increase depth of cut
(a) lip angle
(b) rake angle
(c) relief angle
(d) primary clearance angle
(e) axial rake.
lip angle
(a) 6°
(b) 10°
(c) 2°
(d) 8°
(e) none of the above.
10°
(a) side rake angle
(b) back rake angle
(c) end cutting edge angle
(d) nose radius
(e) side-relief angle.
nose radius
(a) becomes smaller and finally does not form at all
(b) becomes bigger
(c) has nothing to do with speed
(d) may or may not form depending on other conditions
(e) none of the above.
becomes smaller and finally does not form at all
(a) medium speeds
(b) slow speeds
(c) very fast speeds
(d) fast speeds
(e) speed is no criterion for wear.
medium speeds
(a) low carbon steel tools
(b) high carbon steel tools
(c) H.S.Stools
(d) ceramic tools
(e) none of the above
ceramic tools
(a) tungsten powder
(b) carbon powder
(c) aluminium oxide powder
(d) silicon carbide powder
(e) H.S.Spowder.
aluminium oxide powder
(a) mechanites
(b) tungsten carbides
(c) bakelites
(d) stellites
(e) ceramics.
stellites
(a) forging
(b) sintering
(c) welding
(d) soldering
(e) brazing.
brazing.
(a) iron carbide
(b) calcium carbide
(c) tungsten carbide
(d) nickel carbide
(e) aluminium carbide.
tungsten carbide
(a) improves considerably
(b) improves slightly
(c) remains same
(d) gets poor
(e) gets poor or improves depending on work material.
improves slightly
(a) running the shaft at low speed
(b) using low feed
(c) using low depth of cut
(d) using sturdy machine
(e) using steady rest.
running the shaft at low speed
(a) maximum at middle
(b) maximum at sides
(c) minimum at middle
(d) uniform throughout
(e) none of the above.
maximum at middle
(a) cutting speed
(b) depth of cut
(c) feed-rate
(d) lubricant
(e) none of the above.
feed-rate
(a) increase feed-rate
(b) increase speed
(c) increase depth of cut
(d) increase nose radius
(e) supply more quantity of lubricant.
increase depth of cut
(a) 10 mm
(b) 20 mm
(c) 25 mm
(d) 50 mm
(e) 100 mm.
20 mm
(a) 4
(b) 6
(c) 8
(d) 10
(e) 12
8
(a) 100 rows/sec on tape upto
(b) 10 rows/sec on tape
(c) 300 rows/sec on tape
(d) 3000 rows/sec one tape
(e) none of the above.
300 rows/sec on tape
(a) one row on tape
(b) a word, comprising several rows on tape
(c) initial portion of tape
(d) complete instruction
(e) complete programming for a job.
complete instruction
(a) very high speed
(b) high speed
(c) very low speed
(d) medium speed
(e) none of the above.
very low speed
Cover Topic
“polishing teeth”,”buffing machine”,”lapping process”
