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- Image scanner – converts images on a page to electronic signals
- Character and mark Recognition devices – scanning devices used to read
marks on documents.
- Fax machine – converts light and dark areas of an image into format that can
be sent over telephone lines.
- Barcodes readers – photoelectric scanner that reads vertical stripped
marks printed on items.
How a scanning device(Scanner) works
A light bar moves across the object being scanned (the target) and the
light is reflected to the charge coupled device (CCO) by a system of
mirrors. Each cell produces an electrical signal proportional to the strength
of the reflected light that hit it. The signal which represents one pixel in the
original images is converted into binary number and sent to the computer.
Darker portions of the target reflect less light and are given lower numbers
gregorymasila answered the question on November 27, 2017 at 10:54
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Date posted: November 27, 2017. Answers (1)
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Required:
(i) Define the term electronic audit trail
(ii) Differentiate between auditing around the computer and auditing through the
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(iii) State four skills required of information systems auditors.
Date posted: November 27, 2017. Answers (1)
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Dunga Beach Sacco Ltd., a farmers savings and credit co-operative society based in
Kisumu Municipality installed an enterprise resource planning (ERP) software two
years ago. At the time of installation, the Sacco did not undertake the necessary
business process changes, as a result of which most users still prefer to use the
manual system. The Sacco is now planning to undertake the necessary changes.
Required:
(i) State four obstacles that may have hampered the business process changes and suggest four possible strategies that may be used to overcome the obstacles.
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Date posted: November 27, 2017. Answers (1)
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In a systems development life cycle, the systems analyst is interested in finding out the organization's objectives and exploring the nature and scope of the problems under study during the feasibility stage.
Required:
(i) Explain three objectives of a feasibility study.
(ii) Explain the methods used by the systems analyst in defining the objectives
of an organization.
Date posted: November 27, 2017. Answers (1)
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The increased use of multimedia technology can be largely attributed to the easy-
to-use presentation software together with the decreasing costs of the necessary
hardware such as LCD projection panels and laptop computers.
Required:
(i) State four elements of multimedia technology.
(ii) Explain two major uses of multimedia technology.
Date posted: November 27, 2017. Answers (1)
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The owner of a chain of auto-accessory shops in five different towns inputs sales figures into a computer model that displays the selling trends of each store. She uses her own observation form visits to the shops and information gained from the model
to make ordering decisions for each store.
Required:
Are the ordering decisions she makes structured, semi-structured or unstructured? Briefly
explain the reasons for your choice and outline what product related variables are involved
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Date posted: November 24, 2017. Answers (1)
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Certain financial problems such as simplified bread-even analysis models for predicting
profits can be computerized.
P = (Sp – Vc) U – F c
Where:
P = Profits
Sp = Selling price per unit
Vc = Variable cost per unit
U = Number of units of sales
Fc = Fixed cost
Required:
Using the above model, describe any three decisions that management can make form the
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Date posted: November 24, 2017. Answers (1)
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Date posted: November 24, 2017. Answers (1)
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