6 mm diameter power line carries 40 A current and the resistance of one meter is 0.02 ohms. Find the surface temperature of the wire on a day when the wind temperature is 10 ° C, the wind speed is 40 km / h and it crosses the wire. Air characteristics: p = 1.246 kg / m3. k = 0.02439 W / m ° C. Pr = 0.7336, v = 1.426x10 m / s. (Electrical power, P = 1 * R).

Please refer to the article titled as “Improving Occupational Safety and Health in Construction”, published in The Ingenieur, Vol. 69 January – March 2017 by the Board of Engineers Malaysia. Please refer to Attachment 1 on the article titled as “Improving Occupational Safety and Health in Construction”, published in The Ingenieur, Vol. 69 January – March 2017 by the Board of Engineers Malaysia. As an engineer, identify how would it be ethical to ensure that the OSHA 1994 can be enforced ensuring a safer working environment? (400words)

In a spring controlled governor of the Hartung type, the lengths of the horizontal and vertical
arms of the bell crank levers are 100 mm and 80 mm respectively. The fulcrum of the bell crank
lever is at a distance of 120 mm from the axis of the governor. each revolving mass is 9 kg.
The stiffness of the spring is 25 kN/m. If the length of each spring is 120 mm when the radius of
rotation is 70 mm and the equilibrium speed is 360 r.p.m., find the free length of the spring. If
the radius of rotation increases to 120 mm, what will be the corresponding percentage increase
in speed ? [Hint. Free length of the spring = Length of the spring + compression of the spring]

A polytropic process (n= 1.25) compresses air from 0.3 m³ at 22 ⁰C and pressure of 125 kPa to   0.15 m³. It is then expanded at constant temperature to its original volume.

1. Sketch the P-V diagram                                                                                       [1 mark] Determine the;
2. Mass of air                                                                                                          [2 marks]     
3. Pressure at the end of the compression                                                           [2 marks]
4. Final Temperature                                                                                             [2 marks]
5. Net work                                                                                                            [4 marks]
6. Net heat transfer                                                                                               [4 marks]

(a) As an engineer who has just finished taking engineering materials
course, your first task is to investigate the causes of an automobile
accident. Your findings show that the right rear wheel has broken off
at the axle. The axle is bent. The fracture surface reveals a Chevron
pattern pointing toward the surface of the axle. Suggest a possible
cause for the fracture and why?

(b) A titanium pipe used to transport a corrosive material at 400°C is
found to fail after several months. How would you determine the
cause for the failure?

pls I need answers to these questions

The parking lot of a shopping center is square of sides a, delimited by sills of height h, and the entrance to the parking lot is width c. During the last rain it was flooded, and the only escape route was entrance c. To avoid future flooding, it is necessary to determine the time t in which the water takes to evacuate from the enclosure. For the effect, a 1: 100 scale model is used and it is observed that this time depends on all the distances from the parking lot, the gravity, the viscosity and the density of the rainwater. Determine the dimension numbers involved in the problem, ii) if it takes 8 minutes for the water to drain in the model, how long must the barrier be closed for vehicles to enter the parking lot again?

The ppf of the face for the BCC unit cell is greater than the face of the SC unit cell.

is it true or false, justify your reasoning.

A compressor is to run at 250 rpm and requires 75 kW. The drive is provided by V-belts from an electric motor running at 750 rpm. The pitch diameter of the pulley on the compressor is 750 mm and the centre distance between the motor shaft and compressor shaft is 1500 mm. Determine the number of V-belts required to transmit this power if each belt has a cross-sectional area of 375 mm2, density of 1000 kg/m3 and an allowable stress of 2.5 MPa. The groove angle of the pulley is 35° and the coefficient of friction between the belt and pulley is 0.25.

Consider a combined gas-steam power cycle. The topping cycle is a simple Brayton cycle that has a pressure ratio of 7. Air enters the compressor at 15 ºC at a rate of 10 kg/s and the gas turbine at 950 ºC. The bottoming cycle is a reheat Rankine cycle between the pressure limits of 6 MPa and 10 kPa. Steam is heated in a heat exchanger at a rate of 1.15 kg/s by the exhaust gases leaving the gas turbine, and the exhaust gases leave the same exchanger at 200 ºC. Steam leaves the high-pressure turbine at 1 MPa and is reheated to 400 ºC in the heat exchanger before it expands in the low-pressure turbine. Assuming 80 percent isentropic efficiency for all pumps and turbines,

1)  determine the steam temperature at the inlet of the high-pressure. (hint: trial and error)

2) determine the net power output of the combined plant.

3)  determine the thermal efficiency of the combined plant

A combined gas turbine–vapor power plant has a net power output of 200 MW. Air enters the compressor of the gas turbine at 300 kPa, 1200 K, and is compressed to 1000 kPa. The pressure ratio of the gas turbine cycle is 11. Steam leaving the turbine of the vapor power cycle are used to heat the steam at 6 MPa to 350C in a heat exchanger. The combustion gases leave the heat exchanger at 420 K. An open feedwater heater incorporated with the steam cycle operates at a pressure of 1 MPa. The condenser pressure is 10 kPa. Assuming isentropic efficiencies of 80 percent for the pump, 82 percent for the compressor, and 80 percent for the gas and steam turbines, determine (a) the mass flow rate ratio of air to steam, (b) the required rate of heat input in the combustion chamber, and (c) the thermal efficiency of the combined cycle.

Q5 (a) Compare the Direct and Indirect extrusion works with the aids of diagram.

(b) In metal forming, there were temperature ranges used including cold, warm and hot working.

(i) Compare between Hot and Cold working of metals.

(ii) Discuss the advantages and disadvantages for both processes.

(c) In designing and developing new products, engineers need to be aware the design consideration factors for plastic components. Give TWO (2) general design consideration factors, ONE (1) design consideration for extrusion process and FOUR (4) design consideration factors for moulding process.

Why is the effect of a rotating thin cylinder compared to the case of an internally pressurized thin cylinder?