Engineering Metrology MCQs

Question 1

The cross-section of straight edges upto 180 mm length is

Accepted Answer

Rectangular

Answer

Circular

Answer

I-section

Answer

Elliptical

Question 2

'Optical micrometer is used to

Accepted Answer

Set very small displacement by rotating the glass block through relatively large angles

Answer

Measure small linear displacements

Answer

Measure surface profiles

Answer

Measure surface roughness

Question 3

Airy points of support are

Accepted Answer

0.577 L apart

Answer

0.554 L apart

Answer

0.5 L apart

Answer

0.58 L apart

Question 4

The maximum munber of faces in precision polygons can be

Accepted Answer

72

Answer

6

Answer

12

Answer

20

Question 5

In precision polygon, a central hole and small holes are drilled through the thickness

Accepted Answer

For mounting purposes

Answer

To achieve high accuracy

Answer

For ease of manufacture

Answer

To make them light

Question 6

Precision polygons are calibrated from first principles using

Accepted Answer

Two autocollimators

Answer

One autocollimator

Answer

Three autocollimators

Answer

Two precision spirit levels

Question 7

The fact that how closely the instrument reading folloVis the measured variables is termed as

Accepted Answer

Fidelity

Answer

Accuracy

Answer

Threshold sensitivity

Answer

Precision

Question 8

Which of the following methods is not used for testing straightness

Accepted Answer

Interference method

Answer

Spirit level method

Answer

Autocollimator

Answer

Beam comparator

Question 9

Optical square is

Accepted Answer

A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to 90?

Answer

Engineer's square having stock and blade set at 900

Answer

A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to 45?

Answer

Used to produce interference fringes