# Mechanical Engineering

## The rigid gate, OAB, of Fig. P11.23 is hinged at O and rests against a rigid support at B. What minimum horizontal force, P, is required to hold the gate closed if its width is 3 m? Neglect the weight of the gate and friction in the hinge. The back of the gate is exposed to the atmosphere.

The rigid gate, OAB, of Fig. P11.23 is hinged at O and rests against a rigid support at B. What minimum horizontal force, P, is required to hold the gate closed if its width is 3 m? Neglect the weight of the gate and friction in the hinge. The back of the gate is exposed …

## For a fiber-reinforced composite, the efficiency of reinforcement η is dependent on fiber length L according to:

For a fiber-reinforced composite, the efficiency of reinforcement η is dependent on fiber length L according to: η = (L – 2x)/L where x represents the length of the fiber at each end that does not contribute to the load transfer. a) Using MATLAB, plot η versus L (up to L = 40 mm) assuming …

## Crude oil flows through a level section of the Alaskan pipeline at a rate of 1.6 million barrels per day (1 barrels=42 US gallons) the pipe inside diameter is 48 inch and its roughness is equivalent to galvanized iron. The maximum allowable pressure is 1200 psi. At the pumping temperature of 140F, the crude oil has S.G 0.93 and a viscosity of 16.75cP, and a vapour pressure of 50 psi. a)for these conditions, determine the maximum possible spacing between pumping stations(i.e the pipeline will consist of repeating pump-pipe sections to meet the above mentioned criteria) b) Next, if the pump efficiency is 85%, determine the power that must be supplied to the pump at each pumping station( assume pump friction is negligible)

Crude oil flows through a level section of the Alaskan pipeline at a rate of 1.6 million barrels per day (1 barrels=42 US gallons) the pipe inside diameter is 48 inch and its roughness is equivalent to galvanized iron. The maximum allowable pressure is 1200 psi. At the pumping temperature of 140F, the crude oil …

## Question: 3.17. Based on results of a tensile test, the flow curve has para

Based on results of a tensile test, the flow curve has parameters are the following: strain-hardening expo- nent=0.40 and strength coefficient -551.6 MPa. Based on this information, calculate the engineering) tensile strength for the metal. EXPERT ANSWER

## The figure shows a rectangular loop of wire of 80 turns, 13.0by 28.0 cm. It carries a curent of 2.04 A and is hinged at oneside. What is the magnitude of the torque that acts on the loop, ifit is mounted with its plane at an angle of 46.0 degrees to thedirection of B, which is uniform and equal to0.50 T?

The figure shows a rectangular loop of wire of 80 turns, 13.0by 28.0 cm. It carries a curent of 2.04 A and is hinged at oneside. What is the magnitude of the torque that acts on the loop, ifit is mounted with its plane at an angle of 46.0 degrees to thedirection of B, which is …

## 1-8 Discussions Discuss or explain each of the followings: 1. Effect of the carbon percentage on the shape and magnitude (mechanical properties) of stress-strain curve. 2. Effect of the material heat treatment on the shape and magnitude of the stress-strain curve. 3. Differentiate between the behaviors of metallic and non-metallic materials under tensile test. 4. Affect of prior history of plastic deformation on the shape and magnitude of the stress-strain curve. 5. Effect of the strain rate and temperature on the shape and magnitude of the stress- strain curve. 6. Effect of the material grain size on the shape and magnitude of the stress-strain curve.

EXPERT ANSWER 1. Effect of carbon percentage Based on carbon percentage, material is classified broadly into steels and cast iron. Generally, Cast Iron has a carbon percentage of above 2.11% while less than that is considered as steels. Higher carbon percentage means more brittle material and hence less ductile material. Hence, for lower carbon material …