Electrical Engineering

A medical equipment industry manufactures X-ray machines. The unit cost C (the cost in dollars to make each X-ray machine) depends on the number of machines made. If x  machines are made, then the unit cost is given by the function C(x)=0.6x^2-408x+76,064 .What is the minimum unit cost?

A medical equipment industry manufactures X-ray machines. The unit cost C (the cost in dollars to make each X-ray machine) depends on the number of machines made. If x machines are made, then the unit cost is given by the function C(x)=0.6x^2-408x+76,064 .What is the minimum unit cost? EXPERT ANSWER     then the unit …

The Voltage (V) in volts across a charged capacitor decays with time(t) in min according to the relationship: V = k exp(-1t/tau). Estimate values for K and tau if the following values of V and t are measured.

EXPERT ANSWER K=8.4697 and t= 3.3456

a) To satisfy shaded regions, find values of ωn and ζ by estimating it from figure. b) Use Kα = α = 2. Find values for K and KI so that the poles of closed-loop system should be in the shaded regions.

a) To satisfy shaded regions, find values of ωn and ζ by estimating it from figure. b) Use Kα = α = 2.Find values for K and KI so that the poles of closed-loop system should be in the shaded regions. EXPERT ANSWER

A plane wall with surface temperature 350C is attached with straight rectangular fins( k =235 W/m K). The fins are exposed to an ambient air condition of 25C and the convection heat transfer coefficient is 154 W/m2. Each fin has a length of 50mm, a base of 5 mm thick and a width of 100mm. For a Single fin, using a uniform nodal spacing of 10 mm, determine (a) the finite difference equations, (b) the nodal temperatures by solving the finite difference equations, and (c) the heat transfer rate and compare the result with analytical solution.

A plane wall with surface temperature 350C is attached with straight rectangular fins( k =235 W/m K). The fins are exposed to an ambient air condition of 25C and the convection heat transfer coefficient is 154 W/m2. Each fin has a length of 50mm, a base of 5 mm thick and a width of 100mm. …

Select the lightest column section for column AB in the frame shown. The column is under an ultimate load of 700k and only in-plane behavior is considered. Furthermore, assume that the column immediately above or below AB are the same size as AB. All beams are of W18x40 sections. Fy =50ksi . Assume: Inelastic Behavior. Assume any appropriate assumption

EXPERT ANSWER 1. Here it is given thatUse W14×61Fy = 50ksiNow, design strength of column AB Pu = 2658.45kDesign Strength of column AB = 2658.45k2. Let us first design column AB and then Base plate design must be doneAssuming both ends fixed. The effective length is 0.65×16 10.4 feet.Using LRFD, the factored load is Pu=1.2×350+1.6×450=1,140kips  …