1. A warning sign is to be located so it is readable from a distance of 20ft. Sometimes
reading conditions are expected to be unfavorable, but more than 1fc. The message
is important. How high should the letters be?
2. You are to design a VDT workstation that includes use of a keyboard from a seated
position. Identify the recommended dimensions or range of dimensions for the
following:
(a) seat height
(b) seat depth
(c) seat pan slope
(d) back rest slope or angle
(e) clearance between the seat pan and the underside of the work surface
(f) floor-to-table distance
(g) keyboard height
(h) viewing distance
(i) viewing angle from horizontal
3. You are to design access to the top of a tank trailer. The vehicle operator must climb
to the top to check on filling and to seal the hatch. A ladder device must be provided
at the midpoint along the trailer length to reach the fill hatch on top. Sketch your
design solution. Identify key dimensions and note the source of your data. The basic
dimensions of the truck are shown in Figure 33-8.
4. You are to redesign and reconfigure the control/display panel shown in Figure 33-
9. The panel is part of a machine that makes sand molds for castings. The panel con-
tains lights, push buttons, selector switches, and selectors that center themselves in