|--------C--------|

|                          |

R                        L

|-------.v(t).------|

Given the circuit shown in figure. Known that L=1H, R=6 Ω, C=1/9F, iL(0)=0, uC(0)= 2V. v(t)=2cos(t) V of 0<t<π and v(t)=0 if t>π

a) Find V(s) and IL(s).

b)=> iL(t) when t>0

 

The power customer has four circuits of220-volt three phase. The circuits have the maximum demand as follows:

Circuit no 1 = 35 Amperes    Circuit no 3 = 72 Amperes

Circuit no 2 = 46 Amperes    Circuit no 4 = 57 Amperes

The diversity factor is 1.5, the load factor is50% and the power factor is 80%. What is the approximate kW demand of the customer?

a. 15 kW

b. 21 kW

c. 43 kW

d. 53 kW

The power customer has four circuits of220-volt three phase. The circuits have the maximum demand as follows:

Circuit no 1  = 35 Amperes    Circuit no 3 = 72 Amperes

Circuit no 2  = 46 Amperes    Circuit no 4 = 57 Amperes

The diversity factor is 1.5, the load factor is 50% and the power factor is 80%. Determine the maximum KVA demand of the customer?

a. 46

b. 80

c. 26.5

d. 53

1. The building section associated with the floor plan in Figure 3.1 is shown in Figure 3.2. Assume a live load of 2.90 kPa on all three floors. Calculate the axial forces produced by the live load in column C3 in the third and first stories. Consider any live load reduction if permitted.

Note: Assume the top-level (elevation 11.10m from ground level) as a typical floor level.