Following data refer to an automat and a center lathe, which are being compared to machine a batch of parts in a manufacturing shop   Automat Center lathe Machine Set-up Time in min 120 30 Machine Set-up in Rs/min 800 150 Machine Time per piece in min 2 25 Machining Cost in Rs/min 500 100 Automat will be economical if the batch size exceeds

1.  28

2.  32

3.  61

4.  75

View Answer  
4
Correct Answer :

61


Explanation :
No Explanation available for this question

Details pertaining to an orthogonal metal cutting process are given below. Chip thickness ratio 0.4 under formed thickness 0.6mm. Rake angle+100 Cutting speed 2.5m/s Mean thickness of primary shear zone 25micrones. The shear strain rate in s-1 during the process is

1.  0.1781 x 105

2.  0.7754 x 105

3.  1.0104 x 105

4.  4.397 x 105

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4
Correct Answer :

1.0104 x 105


Explanation :
No Explanation available for this question

Two cutting tools are being compared for a machining operation. The tool life equations are: Carbide tool : VT1.6 = 3000 HSS tool : VT0.6 = 200 Where V is the cutting speed in m/min and T is the tool life in min. The carbide tool will provide higher tool life if the cutting speed in m/min exceeds

1.  15.0

2.  39.4

3.  49.36

4.  60.0

View Answer  
4
Correct Answer :

39.4


Explanation :
No Explanation available for this question

Cutting speed in grinding in set to a high value to

1.  Reduce the cutting time

2.  Increase the bond strength

3.  Improve cooling of job and wheel

4.  Reduce the wheel wear

View Answer  
4
Correct Answer :

Reduce the cutting time


Explanation :
No Explanation available for this question

Gear hobbing produces more accurate gears than milling because in hobbing

1.  There is a continuous indexing operation

2.  Pressure angle is larger than in milling

3.  Hob and work piece both are rotating

4.  A special multi-tooth cutter (hob) is used

View Answer  
4
Correct Answer :

There is a continuous indexing operation


Explanation :
No Explanation available for this question

Teeth of internal spur gears can be accurately cut in a

1.  Milling machine

2.  Gear shaping machine

3.  Slotting machine

4.  Hobbing machine

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4
Correct Answer :

Gear shaping machine


Explanation :
No Explanation available for this question

Minimum dimensional and form accuracy can be obtained in the cylinder bores of automobile engines if the bores are finished by

1.  Lapping

2.  Reaming

3.  Internal grinding

4.  Honing

View Answer  
4
Correct Answer :

Honing


Explanation :
No Explanation available for this question

If the longitudinal feed in center-less grinding is expressed by Vf = π D. Nsinα, D stands for

1.  Diameter of blank

2.  Diameter of finished work piece

3.  Diameter of control wheel

4.  Diameter of grinding wheel

View Answer  
4
Correct Answer :

Diameter of control wheel


Explanation :
No Explanation available for this question

In small lot production for machining T-slots on machine tables, it is expected to use

1.  Shaping machine

2.  Broaching machine

3.  Vertical milling machine

4.  Horizontal milling machine

View Answer  
4
Correct Answer :

Vertical milling machine


Explanation :
No Explanation available for this question

When 1.0% plain carbon steel is slowly cooled from the molten state to 740C, the resulting structure will contain

1.  Pearlite and cementite

2.  Ferrite and cementite

3.  Austinite and ferrite

4.  Austenite and cementite

View Answer  
4
Correct Answer :

Austenite and cementite


Explanation :
No Explanation available for this question
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