Metrology and Inspection - Materials, Manufacturing and Industrial Engineering - Mechanical Engineering Previous Year Questions

1

2008 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2008

A displacement sensor (a dial indicator) measures the lateral displacement of a mandrel mounted on the taper hole inside a drill spindle. The mandrel axis is an extension of the drill spindle taper hole axis and the protruding portion of the mandrel surface is perfectly cylindrical. Measurements are taken with the sensor placed at two positions P and Q as shown in the figure. The readings are recorded as \( R_P \) = maximum deflection minus minimum deflection, corresponding to sensor position at \( P \), over one rotation.
If \( R_P = R_Q > 0 \), which one of the following would be consistent with the observation?

A

The drill spindle rotational axis is coincident with the drill spindle taper hole axis

B

The drill spindle rotational axis intersects the drill spindle taper hole axis at point P

C

The drill spindle rotational axis is parallel to the drill spindle taper hole axis

D

The drill spindle rotational axis intersects the drill spindle taper hole axis at point Q

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2

2008 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2008

The Basic Length Unit (BLU), i.e., the table movement corresponding to 1 pulse of the pulse generator, is

A

0.5 microns

B

5 microns

C

50 microns

D

500 microns

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3

2009 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2009

What are the upper and lower limits of the shaft represented by 60 f₈?
Use the following data:
Diameter 60 lies in the diameter step of 50-80 mm.
Fundamental tolerance unit, \( i \) in μm = \( 0.45 D^{1/3} + 0.001 D \), where \( D \) is the representative size in mm.
Tolerance value for IT8 = 25i. Fundamental deviation for ‘f’ shaft = \(-5.5 D^{0.41}\)

A

Lower limit = 59.924 mm, Upper limit = 59.970 mm

B

Lower limit = 59.954 mm, Upper limit = 60.000 mm

C

Lower limit = 59.970 mm, Upper limit = 60.016 mm

D

Lower limit = 60.000 mm, Upper limit = 60.046 mm

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4

2010 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2010

A shaft has a dimension, \( \phi 35_{-0.009}^{-0.025} \). The respective values of fundamental deviation and tolerance are

A

-0.025, ±0.008

B

-0.025, 0.016

C

-0.009, ±0.008

D

-0.009, 0.016

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5

2010 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2010

A taper hole is inspected using a CMM, with a probe of 2 mm diameter. At a height, Z = 10 mm from the bottom, 3 points are touched and a diameter of circle (not compensated for probe size) is obtained as 20 mm. Similarly, a 40 mm diameter is obtained at a height Z = 40 mm. The smaller diameter (in mm) of hole at Z = 0 is

A

13.334

B

15.334

C

15.442

D

15.542

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6

2013 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2013 [Session 1]

Cylindrical pins of 25^+0.010_-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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7

2013 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2013 [Session 2]

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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8

2013 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2013 [Session 2]

Cylindrical pins of 25^+0.010_+0.020 mm diameter are electroplated in a shop. Thickness of the plating is 30^+0.02_-0.0 micron. Neglecting gauge tolerances, the size of the GO gauge in mm to inspect the plated components is

A

25.042

B

25.052

C

25.074

D

25.084

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9

2013 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2013 [Session 3]

Cylindrical pins of \(25^{+0.010}_{+0.010}~mm\) 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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10

2013 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2013 [Session 4]

Cylindrical pins of 25^{+0.020}_{+0.010} mm diameter are electroplated in a shop. Thickness of the plating is 30^{+0.2}_{-0.0} micron. Neglecting gauge tolerances, the size of the GO gauge in mm to inspect the plated components is

A

25.042

B

25.052

C

25.074

D

25.084

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11

2014 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2014 [Session 1]

Which one of the following instruments is widely used to check and calibrate geometric features of machine tools during their assembly?

A

Ultrasonic probe

B

Coordinate Measuring Machine (CMM)

C

Laser interferometer

D

Vernier calipers

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12

2014 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2014 [Session 1]

For the given assembly: 25 H7/g8, match Group A with Group B

A

P-I, Q-III, R-IV, S-II

B

P-I, Q-IV, R-III, S-II

C

P-II, Q-III, R-IV, S-I

D

P-II, Q-IV, R-III, S-I

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13

2014 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2014 [Session 2]

The flatness of a machine bed can be measured using

A

Vernier calipers

B

Auto collimator

C

Height gauge

D

Tool maker’s microscope

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14

2014 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2014 [Session 4]

A GO-NO GO plug gauge is to be designed for measuring a hole of nominal diameter 25 mm with a hole tolerance of ± 0.015 mm. Considering 10% of work tolerance to be the gauge tolerance and no wear condition, the dimension (in mm) of the GO plug gauge as per the unilateral tolerance system is

Check answer

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15

2018 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2018 [Session 1]

The height (in mm) for a 125 mm sine bar to measure a taper of 27° 32′ on a flat work piece is __________ (correct to three decimal places).

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16

2019 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2019 [Session 1]

A circular shaft having diameter 65.00^+0.03_–0.05 mm is manufactured by turning process. A 50 μm thick coating of TiN is deposited on the shaft. Allowed variation in TiN film thickness is ± 5 μm. The minimum hole diameter (in mm) to just provide clearance fit is

A

65.01

B

65.12

C

64.95

D

65.10

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17

2020 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2020 [Session 1]

The following data applies to basic shaft system:
tolerance for hole = 0.002 mm,
tolerance for shaft = 0.001 mm,
allowance = 0.003 mm,
basic size = 50 mm.
The maximum hole size is ______ mm (round off to 3 decimal places).

Check answer

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18

2020 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2020 [Session 2]

The figure below shows a symbolic representation of the surface texture in a perpendicular lay orientation with indicative values (I through VI) marking the various specifications whose definitions are listed below. P: Maximum Waviness Height (mm); Q: Maximum Roughness Height (mm); R: Minimum Roughness Height (mm); S: Maximum Waviness Width (mm); T: Maximum Roughness Width (mm); U: Roughness Width Cutoff (mm). The correct match between the specifications and the symbols (I to VI) is

A

I-R, II-Q, III-P, IV-S, V-U, VI-T

B

I-R, II-P, III-U, IV-S, V-T, VI-Q

C

I-U, II-S, III-Q, IV-T, V-R, VI-P

D

I-Q, II-U, III-R, IV-T, V-S, VI-P

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19

2020 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2020 [Session 2]

Two rollers of diameters D1 (in mm) and D2 (in mm) are used to measure the internal taper angle in the V-groove of a machined component. The heights H1 (in mm) and H2 (in mm) are measured by using a height gauge after inserting the rollers into the same V-groove as shown in the figure. Which one of the following is the correct relationship to evaluate the angle α as shown in the figure?

A

sin α = (D1 - D2) / (2(H1 - H2) - (D1 - D2))

B

cos α = (D1 - D2) / (2(H1 - H2) - 2(D1 - D2))

C

cosec α = (H1 - H2) - (D1 - D2) / (2(D1 - D2))

D

sin α = (H1 - H2) / (D1 - D2)

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20

2021 · Mechanical Engineering · Materials, Manufacturing and Industrial Engineering · Metrology and Inspection

Mechanical Engineering (ME) 2021 [Session 1]

Consider the surface roughness profile as shown in the figure.
The center line average roughness (\(R_a\), in \(\mu m\)) of the measured length (\(L\)) is

A

0

B

1

C

2

D

4

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