EEI CAST case studies
EEI CAST · Put your knowledge to work in context.
This independent study page provides practice for EEI CAST. Its editorial learning areas include Mechanical reasoning, drawings, arithmetic and written instructions. The questions develop subject knowledge and application through worked reasoning, distinctions between competing answers, and practical scenarios. Study the relevant guide before attempting a mixed set, then explain the evidence or calculation that supports each answer. Topics on this exam: Mechanical reasoning, drawings, arithmetic and written instructions. The EEI CAST case studies are 4 cases and about 617 words.
1A longer effort arm changes force and distance
A fictional ideal first-class lever balances a 120-newton load at a perpendicular distance of 0.20 metres from its pivot. The applied effort acts at a perpendicular distance of 0.60 metres on the other side. The classroom model neglects the lever’s weight and friction. A learner says the longer arm creates extra energy because less effort force is needed.
158 words, under 1 min2An idler changes direction but not the end ratio
A fictional ideal external gear train has a twenty-tooth input gear, a thirty-tooth idler and a forty-tooth output gear. The input rotates at 600 revolutions per minute, and the supplied model neglects slip and loss. A learner multiplies all three tooth counts as though the idler created a separate compound shaft ratio. Another follows each mesh and cancels the intermediate tooth count when calculating the end-to-end speed ratio.
146 words, under 1 min3Dimensions replace a visual estimate
A fictional text-described drawing shows a straight horizontal overall distance of 240 millimetres. Two consecutive segments on that same line are labelled 75 millimetres and 95 millimetres, with one remaining nonoverlapping segment unspecified. The note says the sketch is not to scale. A learner estimates the final segment from its apparent width, while another subtracts the supplied segment dimensions from the overall length.
142 words, under 1 min4An instruction includes a prerequisite and a sequence
A fictional written procedure states: before the scheduled inspection, the authorized supervisor confirms that the required isolation has been completed and verified under the site procedure. Only then does the designated competent person begin the inspection. The passage supplies no alternative live-work route and says nothing about returning the equipment to production. A learner concludes that anyone may start if the control display says stopped.
171 words, under 1 min