Metrology and Inspection - Quality and Reliability - Production & Industrial Engineering Previous Year Questions

1

2007 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2007

The geometric tolerance that does NOT need a datum for its specification is

A

Concentricity

B

Runout

C

Perpendicularity

D

Flatness

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2

2007 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2007

Which one of the following instruments is a comparator?

A

Tool Maker's Microscope

B

GO/NO GO gage

C

Optical Interferometer

D

Dial Gauge

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3

2007 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2007

Tolerance on the dimension \( x \) in the two component assembly shown below is
(All dimensions in mm)

A

\(\pm 0.025 \)

B

\(\pm 0.030 \)

C

\(\pm 0.040 \)

D

\(\pm 0.045 \)

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4

2008 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2008

Following data are given for calculating limits of dimensions and tolerances for a hole:
Tolerance unit i (μm) = 0.45√D + 0.001D . The unit of D is mm. Diameter step is 18-30 mm. If the fundamental deviation for H hole is zero and IT8 = 25i , the maximum and minimum limits of dimension for a 25 mm H₈ hole (in mm) are

A

24.984, 24.967

B

25.017, 24.984

C

25.033, 25.000

D

25.000, 24.967

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5

2008 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2008

An experimental setup is planned to determine the taper of workpiece as shown in the figure. If the two precision rollers have radii 8 mm and 5 mm and the total thickness of slip gauges inserted between the rollers is 15.54 mm, the taper angle \(\theta\) is

A

6 degree

B

10 degree

C

11 degree

D

12 degree

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6

2008 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2008

Following data are given for calculating limits of dimensions and tolerances for a hole: Tolerance unit \(i (\mu m) = 0.45\sqrt[3]{D} + 0.001D\). The unit of \(D\) is mm. Diameter step is 18-30 mm. If the fundamental deviation for H hole is zero and \(IT8 = 25i\), the maximum and minimum limits of dimension for a 25 mm H8 hole (in mm) are

A

24.984, 24.967

B

25.017, 24.984

C

25.033, 25.000

D

25.000, 24.967

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7

2009 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2009

An autocollimator is used to

A

measure small angular displacements on flat surfaces

B

compare known and unknown dimensions

C

measure the flatness error

D

measure roundness error between centers

Check answer

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8

2009 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2009

A spur gear having a pressure angle of 20°, module of 4 mm and 40 teeth is to be inspected for its pitch circle diameter using two rollers (test plug method). If the centres of the rollers lie on the pitch circle, the suitable roller diameter (in mm) and the resulting distance (in mm) between the rollers placed in opposite spaces will respectively be

A

2.9 and 82.9

B

2.9 and 165.9

C

5.9 and 82.9

D

5.9 and 165.9

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9

2010 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2010

A small bore is designated as 25H7. The lower (minimum) and upper (maximum) limits of the bore are 25.000 mm and 25.021 mm, respectively. When the bore is designated as 25H8, then the upper (maximum) limit is 25.033 mm. When the bore is designated as 25H6, then the upper (maximum) limit of the bore (in mm) is

A

25.001

B

25.005

C

25.009

D

25.013

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10

2011 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2011

The best wire size (in mm) for measuring effective diameter of a metric thread (included angle is 60°) of 20 mm diameter and 2.5 mm pitch using two wire method is

A

1.443

B

0.723

C

2.886

D

2.086

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11

2011 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2011

To measure the effective diameter of an external metric thread (included angle is 60°) of 3.5 mm pitch, a cylindrical standard of 30.5 mm diameter and two wires of 2 mm diameter each are used. The micrometer readings over the standard and over the wires are 16.532 mm and 15.398 mm, respectively. The effective diameter (in mm) of the thread is

A

33.366

B

30.397

C

29.366

D

26.397

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12

2011 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2011

Observation of a slip gauge on a flatness interferometer produced fringe counts numbering 10 and 14 for two readings. The second reading is taken by rotating the set-up by 180°. Assume that both faces of the slip gauge are flat and the wavelength of the radiation is 0.5086 μm. The parallelism error (in μm) between the two faces of the slip gauge is

A

0.2543

B

1.172

C

0.5086

D

0.1272

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13

2012 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2012

In an interchangeable assembly, shafts of size 25.000^{+0.040}_{+0.010} mm mate with holes of size 25.000^{+0.030}_{+0.020} mm. The maximum interference (in microns) in the assembly is

A

40

B

30

C

20

D

10

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14

2012 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2012

A sine bar has a length of \(250 mm\). Each roller has a diameter of \(20 mm\). During taper angle measurement of a component, the height from the surface plate to the centre of a roller is \(100 mm\). The calculated taper angle (in degrees) is

A

21.1

B

22.8

C

23.6

D

68.9

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15

2013 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2013 [Session 1]

A metric thread of pitch 2 mm and thread angle 60° is inspected for its pitch diameter using 3-wire method. The diameter of the best size wire in mm is

A

0.866

B

1.000

C

1.154

D

2.000

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16

2013 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2013 [Session 1]

Cylindrical pins of \( 25^{+0.020}_{+0.010} \) mm diameter are electroplated in a shop. Thickness of the plating is \( 30^{+0.20}_{-0.10} \) micron. Neglecting gage tolerances, the size of the GO gage in mm to inspect the plated components is

A

25.042

B

25.052

C

25.074

D

25.084

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17

2013 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2013 [Session 4]

Cylindrical pins of \(25^{+0.020}_{+0.010} mm\) diameter are electroplated in a shop. Thickness of the plating is \(30^{+2.0}_{-0.0} micron\). Neglecting gage tolerances, the size of the GO gage in mm to inspect the plated components is

A

25.042

B

25.052

C

25.074

D

25.084

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18

2016 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2016

The limits of a shaft designated as 100h5 are 100.000 mm and 100.014 mm. Similarly, the limits of a shaft designated as 100h8 are 100.000 mm and 100.055 mm. If a shaft is designated as 100h6, the fundamental deviation (in μm) for the same is

A

-22

B

zero

C

22

D

24

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19

2016 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2016

The roughness profile of a surface is depicted below.
The surface roughness parameter R_a (in μm) is ______.

Check answer

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20

2017 · Production & Industrial Engineering · Quality and Reliability · Metrology and Inspection

Production & Industrial Engineering (PI) 2017

Accuracy of a measuring instrument is expressed as

A

true\ value - measured\ value

B

measured\ value - true\ value

C

1 - \frac{|true\ value - measured\ value|}{true\ value}

D

1 + \frac{|true\ value - measured\ value|}{true\ value}

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