AP ECET case studies
AP ECET · Put your knowledge to work in context.
AP ECET - the Andhra Pradesh Engineering Common Entrance Test - is the lateral-entry gateway into the second year of B.Tech and B.Pharmacy programmes in Andhra Pradesh. It exists for people who already hold a diploma in engineering/technology, or a B.Sc. The AP ECET case studies are 5 cases and about 3,801 words.
1Minimum-cost tank geometry under a plate-width limit
A fabrication unit has won an order for four identical open-top rectangular steel tanks, each of internal volume exactly 4.00 m3. The owner's costing sheet is: base plate at Rs 450 per m2, side plates at Rs 300 per m2, and four vertical corner welds at Rs 120 per running metre each, that is Rs 480 per metre of tank height.
819 words, about 4 min2Will the inclined-plane rig move? Static check before dynamics
A workshop demonstration rig has a 6.0 kg steel block on a plane inclined at 30 degrees to the horizontal, connected by a light inextensible string running parallel to the plane, over a frictionless pulley at the top edge, to a hanging mass of 8.0 kg. The coefficients of friction between block and plane are mu s = 0.45 and mu k = 0.35.
748 words, about 4 min3Cooling-water corrosion coupons and a materials decision
An open recirculating cooling tower at a chemical plant circulates 850 m3/h. Make-up water: pH 7.9, chloride 320 mg/L as Cl-, total hardness 640 mg/L as CaCO3, alkalinity 180 mg/L as CaCO3.
756 words, about 4 min4M30 mix proportioning where durability governs, and a water addition on site
A ready-mix plant is proportioning M30 concrete for a water-retaining structure. Specification: characteristic cube strength 30 MPa at 28 days, maximum free water/cement ratio 0.45, minimum cement content 340 kg/m3, slump at discharge 75 +/- 25 mm.
753 words, about 4 min5Power-factor correction on a workshop bus that also feeds a VFD
A small engineering workshop is supplied at 415 V, 3-phase, 50 Hz through a 63 A LT connection. The loads running together at full load during the shift are: 15 kW cage induction motor at power factor 0.82 5 kW compressor motor at power factor 0.78 8 kW lighting and resistance heaters at unity power factor The tariff charges Rs 350 per kVA of billing demand and penalises a monthly average power factor below 0.90.
725 words, about 4 min