Mechanical Engineering - Production Engineering

41. 

The machining of titanium is difficult due to

A. high thermal conductivity of titanium
B. chemical reaction between tool and work
C. low tool-chip contact area
D. none of these

Answer: Option C

Explanation:

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42. 

In orthogonal cutting system, the maximum chip thickness occurs at the middle.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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43. 

Lapping is an operation of

A. making a cone-shaped enlargement of the end of a hole
B. smoothing and squaring the surface around a hole
C. sizing and finishing a small diameter hole
D. producing a hole by removing metal along the circumference of a hollow cutting tool

Answer: Option C

Explanation:

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44. 

The different spindle speeds on a lathe form

A. arithmetical progression
B. geometrical progression
C. harmonical progression
D. any one of these

Answer: Option B

Explanation:

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45. 

If the helix angle of the drill is made __________ 30°, then the torque required to drive the drill at a given feed will be more.

A. equal to
B. less than
C. more than

Answer: Option B

Explanation:

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