GMI Equipment Performance 2

Question 1

What is the primary purpose of a densitometer in a pressroom environment?

Accepted Answer

To measure ink film thickness on printed substrates

Answer

A densitometer measures the optical density of ink on a substrate, providing data on ink film thickness and consistency.

Question 2

When a printing press shows inconsistent ink laydown across the sheet width, the most likely cause is:

Accepted Answer

Uneven roller pressure or worn rollers

Answer

Uneven or worn ink rollers fail to distribute ink uniformly across the form, causing variation in density across the sheet width.

Question 3

In offset lithography, the term 'dot gain' refers to:

Accepted Answer

An increase in halftone dot size from film to final print

Answer

Dot gain is the phenomenon where halftone dots print larger than their intended size, caused by ink spread and optical effects.

Question 4

Which measurement tool is used to verify the squareness and dimensional accuracy of a printed sheet?

Accepted Answer

Diagonal gauge or T-square

Answer

A diagonal gauge or T-square is used to verify that sheets are cut square and that dimensions are within specification.

Question 5

A spectrophotometer differs from a densitometer primarily because it:

Accepted Answer

Measures full spectral reflectance to calculate CIE Lab values

Answer

A spectrophotometer measures reflectance across the visible spectrum and calculates colorimetric values such as CIE Lab, enabling precise color matching.

(GMI) Graphic Measures International Certification Practice Test

(GMI) Graphic Measures International Certification Practice Test

GMI Equipment Performance 2