Search & Filtering
A computer uses a memory of 65,536 words with eight bits in each word. It has the following registers: PC, AR, TR (16 bits each), and AC, DR, IR (eight bits each). A memoryreference instruction consists of three words: an 8-bit operation- code (one word) and a 16-bit address (in the next two words). All operands are eight bits. There is no indirect bit
A current of 90 A is shared by three resistances in parallel. The wires are of the
same material and have their lengths in the ratio 2: 3: 4 and their cross-sectional areas
in the ratio 1: 2: 3. Determine current in each resistance
Draw the logic diagram of all the cells of one word in an associative memory. Include the standard read and write logic and the match logic.
name at least 4 typical environmental problems you observed as a whole which has a big impact on society's well-being. briefly discuss how these affect you as an individual and a civil engineering student.
As ahown in the figure find that at what distance body A will attain a velocity of 3 m/s.when starts from the rest.Asaume coefficient of friction is 0.2for blocks and surface and pulleys are weightless and frictionless
A. Define mechanical property.
B. In the most basic terms explain what happens during heat treatment.
C. A metal fabricator wants to make a spur gear from mild steel. However, the application of the entire gear requires hardness and wear-rcsistance. State and explain the most suitable heat treatment process that would impart these properties.
D. A specimen of mild steel was put under tensile testing; the dimensions of the specimen before testing were (50 mm gauge length and 12 mm diameter). After the test the specimen had dimensions (55 mm in length and 1 1.46 mm diameter). Calculate:
i. Percent elongation
ii. Percent reduction in area
E. Sketch a typical stress strain cure for mild steel and indicate the following points.
1. Elastic Limit ii. Yield Point iii. Fracture Point
A. What is meant by the term: atomic structure?
B. State Pauli's Exclusion principle
C. Write the electronic configuration for the following:
Neon [Ne - 10]
Argon [Ar - 18]
D. Sodium chloride (NaCl) exhibits predominantly ionic bonding. The [Na - 11]+ and [Cl — 17]- ions have electron structures that are identical to which two inert gases?
E. Clearly show that the atomic packing factor of face-centred cubic structure is 0.74.
Calculate the radius of a barium atom, given that Ba has a BCC crystal structure, a density of 3.6.g/cm3 and an atomic weight of 137 g/mol.
A. A tensile modulus of number of plastic is ABS 2.5 GPa, PVC 3.1GPa. Which of the plastics is the stiffest?
B. Define the following terms:
i. Metals ii. Polymeys iii. Composits Ceromics
v. Themomoplastic vi. Thermosetting plastic
c. List FOUR 4 additives that goes into polymers to improve its property.
D. List SIX (6) common characteristics of polymers:
List the THREE (3) classification ofthe imperfections and THREE (3) defects in solids.
D. Which properties of material would you need to consider if you required materials which were:
Capable of being bent into a fixed shape, iii. Capable Of not fracturing when small cracks are present, iv. Not easily broken
v. Act as electrical insulator vi. A good conductor of heat vii. Capable of being used as the lining for a tank storing acid.
E. List the TWO (2) applications of the following materials:
i. Plain Carbon steel 0.3 % Carbon ii. Medium Carbon Steel 0.7 Carbon iii. High Carbon Steel 0.9 — 1.5% Carbon iv. Stainless steel Cast Iron vi. Wrought iron
B. What is heat treatment?
C. Define and explain the processes of the following heat treatment process.
i. Hardening ii. Tempering iii. Case hardening iv. Age hardening
D. List the mechanical properties of the following materials and give TWO (2) engineering applications for each.
i. Glass
Wood iii. Metal
Polymers
E. What is heat treatment and list TI--IREE (3) quenching media.
