# 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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4