Question Solved1 Answer Available SC: 500 MVA X/R: 6 1. Calculate the symmetrical 3ph fault current at point F1 1MVA, 13.8kV/480V Z = 5.75% 3 - 175mm2 (350kcmil) Cu in steel conduit, 30.5m F1 open line Each feeder supplies mixed lighting and motors with total combined motor of 250hp

A separately-excited DC motor has the following parameters: Ra = 0.25 2, Ke = 0.62 V/ rpm. Wb, (flux per pole) = 175 mWb. The motor speed is controlled by a single-phase, full-wave bridge rectifier. The firing angle a is set at 45°, and the average speed is 1300 rpm. The applied AC voltage to the bridge is 230 V at 50Hz. Assuming the motor current is continuous; calculate the armature current drawn by the motor and the steady-state torque for the cases of: (i) Fully-controlled bridge shown in Fig.5a Half-controlled (semiconverter) bridge shown in Fig.5b (5) (5) T3 La T1 T2 La Ra Ra va DEW ea Ата T4 ea D1% D2 Fig. 5a Fig. 5b

A machine produces electrical components. 99.7% of the components have lengths between 1.176 cm and 1.224 cm. Assuming this data is normally distributed, what are the mean and standard deviation? Another machine produces electrical components; however for this machine there are 68% of the components have lengths between 1.176 cm and 1.224 cm. Assuming this data is normally distributed, what are the mean and standard deviation?

2) Create a maths problem and model solution corresponding to the following question: "Find the directional derivative of the following two-variable function for the supplied point and unit vector" Evaluate the directional derivative at the point (2, 5). Ensure that your supplied function uses both x and y, has 3 terms, and that at least one of those terms contains vx . You may choose the vector representing the direction you will evaluate the directional derivative in, and the derivative must be a multiple of 2. 3) Create a maths problem and model solution corresponding to the following question: "Determine the derivative with respect to x for the following function" Your problem should provide a function that requires use of the chain rule and the product rule to differentiate, contains tanh(2x), and produces a derivative that includes In(3) 4) Create a maths problem and model solution corresponding to the following question: "Evaluate the following integral using trigonometric substitution" The integral should make use of the substitution x = atan, and also require a second substitution to solve. The square root component should be multiplied by a polynomial.

4) Create a maths problem and model solution corresponding to the following question: "Evaluate the following integral using trigonometric substitution" The integral should make use of the substitution x = atane, and also require a second substitution to solve. The square root component should be multiplied by a polynomial.

A rectangular tank 6 x 8 ft is filled with a gasoline to a depth of 80 ft. The pressure at the gasoline is 14.7 psi. Find the pressure at the bottom of the tank and force exerted on the bottom.

14. Determinethecostof capitalfor the followingsecurities. Assume40%taxrate. a) A seven-year debenture with a coupon interest of 10%. The debentures matures infiveyearsandhasa currentmarketpriceofBr90 as againstits par valueofBr 100. b) A preference share pays 7% dividend. Par value is Br 100 per share and its currentmarketpriceis Br 80. 14. Determinethecostof capitalfor the followingsecurities. Assume40%taxrate. a) A seven-year debenture with a coupon interest of 10%. The debentures matures infiveyearsandhasa currentmarketpriceofBr90 as againstits par valueofBr 100. b) A preference share pays 7% dividend. Par value is Br 100 per share and its currentmarketpriceis Br 80.