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Engineering Metrology Mcqs

Q:

What is the tool maker’s flat size which generally uses both the faces as a working surface?

A) 30 to 45 mm B) 50 to 75 mm
C) 75 to 100 mm D) 100 to 200 mm
 
Answer & Explanation Answer: B) 50 to 75 mm

Explanation: Both the faces are highly finished in the range of 50-75 mm size and both are used as working surface and above this range it has only one face finished as working surface.

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Q:

Which of the following is not true about the requirements of material selection for tool maker’s flats?

A) Suitable surface for the wringing purpose B) High degree of rigidity
C) Wear resistance D) Absorb radiant heat
 
Answer & Explanation Answer: D) Absorb radiant heat

Explanation: Material should have a proper surface so that gauges can be wrung on to it and it should have a high degree of rigidity and freedom from warping. Material should reflect radiant heat.

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Q:

Why are shallow grooves provided in larger flats?

A) To minimize the possibilities of uneven hardening B) For design purpose
C) To maintain high accuracy for a longer period D) To make them lighter
 
Answer & Explanation Answer: A) To minimize the possibilities of uneven hardening

Explanation: A shallow groove is provided around the periphery of larger flats to avoid uneven hardening and for easy handling.

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Q:

Which of the following is not true about tool maker’s flats?

A) Tool maker’s flats should be free from inclusions B) Tool maker’s flats are of less hardness
C) Working surfaces are produced by lapping D) Should be located in a stirred atmosphere
 
Answer & Explanation Answer: B) Tool maker’s flats are of less hardness

Explanation: Tool maker’s flats should be free from inclusions which after proper heat treatment gives a high hardness. Working surfaces are finished by lapping to possess a high degree of accuracy and uniformity.

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Q:

What is the shape of the tool maker’s flats?

A) Circular B) Rectangular
C) Square D) Triangular
 
Answer & Explanation Answer: A) Circular

Explanation: Tool maker’s flats are small circular surface plates which are used for the high precision measurement work.

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