Engineering Metrology MCQs

Question 1

Pick up the wrong statement :

Accepted Answer

As the sensitivity of an instrument increase, its range of measurement also increases.

Answer

Accuracy of an instrument is closeness to the true dimension

Answer

Precision represents the degree of repetitiveness.

Answer

Sensitivity refers to minimum change in value that the instrument can reliably indicate.

Question 2

Fiducial indicators contain

Accepted Answer

A single index mark

Answer

Calibrated scale

Answer

Micrometer screw movement

Answer

Optical head

Question 3

A comparator for its working depends on

Accepted Answer

Comparison with standard such as slip gauges

Answer

Accurately calibrated scale

Answer

Accurate micrometer gauge

Answer

Optical devices

Question 4

Precision is

Accepted Answer

The repeatability of a measuring process

Answer

Agreement of the result of a measurement with the true value of the measured quantity

Answer

The ability of a measuring device to detect small differences in a quantity being measured the ability of an instrument to reproduce same reading under identical conditions

Answer

(e) error of judgment in reading an observation.

Question 5

The thickness of oil film at the surface of slip gauges is of the order of

Accepted Answer

.005 micron

Answer

.1 micron

Answer

1 micron

Answer

10 microns

Question 6

Pick up the wrong statement. Surface plates are usually made of granite because of following advantages

Accepted Answer

It enables the phenomenon of wringing flat surfaces over it.

Answer

Because of long period of time for relaxing, it is free from built in residual stresses. There is no corrosion effect also.

Answer

If a tool or workpiece drops accidently over its surface, residual stresses are not induced

Answer

It simply powders somewhat at the point of impact by falling object

Question 7

Pick up the wrong statement.

Accepted Answer

Random error are regularly repetitive in nature and result from improper conditions or procedures that are consistant in action

Answer

Error is the disagreement between the result of measurement and actual value.

Answer

Parasitic error results from incorrect execution of measurement.

Answer

Uncertainty of measurement represents the dispersion of the result of measurement defmed by the limits of the error.

Question 8

Which one of the following instruments is the most accurate

Accepted Answer

Optical projector.

Answer

Steel scale

Answer

Vernier caliper

Answer

Vernier dial gauge

Question 9

In the case of high precision surface plates of diameter upto 200 mm, the working surface should lie between two parallel planes, whose maximum distance apart is

Accepted Answer

0.0005 mm

Answer

0.005 mm

Answer

0.05 mm

Answer

0.5 mm