#### Circuits

PROBLEM- A 50-HP DC motor operates from a 220Volt DC source With Power Loss 3,350 w rated at full-load conditions. The speed at full-load is 1150 rpm. the speed without Load is 50 rpm more. Find: a) The Source Current b) The efficiency of the motor under full-load. c) The speed regulation d) Any comments on efficiency and speed regulation? Are they suppose to be where theory says to be?

EECE205-Linear Circuits II w/Lab 1. Via the convolution integral, determine the output vo(t) = h(t) * u(t), where (a) vi(t) = u(t+2) - u(t− 2) = h(t). Also, sketch the output in time domain. (b) vi(t) = 3u(t - 2) and h(t) is the impulse response of the circuit shown in Fig. 1 - {pl = and h(t) is the impulse response of the circuit shown in Fig. 1 (c) vi(t) 4 exp(-2t+8) Vi 0≤t≤4 4 ≤t otherwise 50 mH 5 1.2 ΚΩ Figure 1: Circuit for Question 1 Vo Summer 2023

calculate

Assignment # 11

a) What is the current flowing through R2? b) If the value of resistor R3 in the circuit is reduced by half, does the current through resistor R1 increase or decrease?

Problem 2: (Lab 1) The earth ground resistance at the base of a transmission tower is 5 0. If the tower is struck by a lightning bolt of 100kA, how much power will be dissipated in the ground?

Problem 5: (Lab 3 Exercise 1) a) What is the ratio between the line voltages and the ratio between the line currents in a wye- wye connected, three-phase circuit? b) What is the ratio between the line voltages and the ratio between the line currents in a delta- delta connected, three-phase circuit?

Problem 4: (Lab 2 Section 1-3) What is the average power dissipated by a 1.5k0 resistor when it is connected to an ac source having an amplitude of 240 V? ●

Problem 7: Lab 4 What are the main differences between single-unit, three-phase power transformers and three- phase transformer banks? Problem 8: (Lab 4) Consider a three-phase transformer bank connected in a wye-delta configuration. Each winding at the primary of the three-phase transformer bank is made of 5400 turns of wire, while each winding at the secondary is made of 1250 tums of wire. If the line voltage Eves at the primary is equal to 100 kV, determine the line voltage Esec. at the secondary

Problem 6: (Lab 3 Exercise 1) In a balanced, delta-connected, resistive, three-phase circuit, the phase voltage ErHASE is 420V and the line current luNE is 6.9 A. Calculate the total active power ProTAL, dissipated in the circuit.