Engineering Answers

A villager in South Africa has an inhabitant of five hundred people. It is 200 km from the nearest Eskom substation based on line of sight. Presently, the only source of electric power in the village is diesel generator. Due to Covid-19, the company that used to maintain the generator has folded up, consequently, the villagers have no electricity. Design a standalone (off grid) Photovoltaic (PV) system with special reference to the village in South Africa with the 8 PV panel generation factors: 

XXX company requires an impulse generator with a maximum charging voltage of 120 kV. As a technologist, you are requested to design an n stage impulse generator that will have a maximum charging voltage of 120 kV with each condenser rated at 125 kV.. You are requested to provide the following for your design: 1. The number of stages for the impulse generator ˆ 8 ≤ n ≤ 10 The selection of the number of stages should be scientifically motivated. 2. Rated capacitance of each condenser. 3. Maximum output voltage 4. Simulations of the impulse generator for at-least 10 seconds. You are also require to provide simulations for 5 % and 10 % deviation of the test specimen’s rated capacitance. 5. Detailed report During engagements with hte company, it is further established that the capacitance of the test specimen is 1000pF. The

a steel tape of nominal length 200m with a plumb bob of mass 16kg attached to it was used to measure a length down a shaft as 160.852m. the mean temperature during the measurement was 4'C. if the tape was standardized to be 200.0014m under a tension of 115n at 20'C temperature, determine the correct measured length .

a 30m weighing 0.900kg has a cross-sectional area 0.0485cm^2. the tape measures 30.000m when supported throughout under a tension of 5kg. the modulus of elasticity is 2.1x10^6kg/cm. what tension is required to make the tape measure 30m when supposed only at the two ends?

Calculate the size of a rectangular sedimentation tanks to treat a flow of 12,000 m3/d. Adopt an overflow rate of 20 m3/m2-d and detention time of 4 hours. Use two units in parallel. What will be the minimum weir length required if the weir overflow rate is not to exceed 300 m3/m-d? Also check the horizontal velocity.

Calculate the size of a rectangular sedimentation tanks to treat a flow of 12,000 m3/d. Adopt an overflow rate of 20 m3/m2-d and detention time of 4 hours. Use two units in parallel. What will be the minimum weir length required if the weir overflow rate is not to exceed 300 m3/m-d? Also check the horizontal velocity.

What are the METHODS OF FORECATING POPULATION?

A traffic light and signal pole is subjected to the weight of each the weight of traffic signal W_s = 45 lb and the weight of the road lamp W_L = 55 lb. The pole is fixed at the base. Find the principal normal stresses and the maximum shear stress on element B located 19 ft above the base (see figure). Assume that the weight of the pole and later arms is included in the signal and lamp weights. [Ans. sigma_max = 2689 psi]

Determine the horizontal and vertical components of reaction on the member at the pin A, and the normal reaction at the roller B.