Mechanical Engineering - Production Engineering

46. 

The angle included between the two lips projected upon a plane parallel to the drill axis and paralled to the two cutting lips, is called helix angle.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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47. 

In hot machining, tool is made of

A. tungsten carbide
B. brass or copper
C. diamond
D. stainless steel

Answer: Option A

Explanation:

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48. 

In ultra-sonic machining, the metal is removed by

A. using abrasive slurry between the tool and work
B. direct contact of tool with the work
C. maintaining an electrolyte between the work and tool in a very small gap between the two
D. erosion caused by rapidly recurring spark discharges between the tool and work

Answer: Option A

Explanation:

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49. 

The velocity of tool relative to the workpiece is known as cutting velocity.

A. True
B. False

Answer: Option A

Explanation:

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50. 

Grinding wheels should be tested for balance

A. only at the time of manufacture
B. before starting the grinding operation
C. at the end of grinding operation
D. occasionally

Answer: Option D

Explanation:

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