Design, Drawing, Safety, Standards and Quality — Practice

Question 1

Which projection system does Indian drawing practice follow?

Accepted Answer

First-angle projection, with the object between the observer and the plane.

Question 2

Which ISO standard covers environmental management?

Accepted Answer

ISO 14001.

Question 3

A hole is 25.000 to 25.021 mm and a shaft is 24.980 to 24.993 mm. What type of fit is this and what are the clearance limits?

Accepted Answer

A clearance fit. Minimum clearance 25.000 - 24.993 = 0.007 mm and maximum 25.021 - 24.980 = 0.041 mm.

Question 4

List the hierarchy of controls from most to least preferred.

Accepted Answer

Eliminate, substitute, engineering controls, administrative controls, then personal protective equipment.

Question 5

A shaft is toleranced 10.00 plus or minus 0.06 mm with a process standard deviation of 0.02 mm. Find Cp.

Accepted Answer

Cp = 0.12 / (6 x 0.02) = 1.0, which is marginal.

Question 6

State the aim and the improvement cycle of Six Sigma.

Accepted Answer

It aims at about 3.4 defects per million opportunities and improves processes by the DMAIC cycle: define, measure, analyse, improve and control.

Question 7

On the bathtub curve, where does preventive maintenance help most, and why?

Accepted Answer

In the wear-out region, where failure rate rises with age and scheduled replacement removes parts before they fail. In the constant-rate region it adds little.

Question 8

Why does the hole-basis system fix the hole and vary the shaft?

Accepted Answer

A hole is harder to finish accurately than a shaft, so it is kept to standard limits.

Practice — Design, Drawing, Safety, Standards and Quality

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