Unbalanced 3 Phase Loads
An important property of a three-phase balanced system is that the phasor sum of the three line or phase voltages is zero, and the phasor sum of the three line…
Power in Balanced 3 Phase Loads
Balanced loads, in a 3φ system, have identical impedance in each secondary winding (Figure 12). The impedance of each winding in a delta load is shown as Z∆ (Figure 12a),…
Three Phase Systems
A three-phase (3φ) system is a combination of three single-phase systems. In a 3φ balanced system, power comes from a 3φ AC generator that produces three separate and equal voltages,…
Electric Drives and Traction Interview Questions
Electric Drives and Traction Interview Questions 1. What are the requirements of an ideal traction system? The requirements of an ideal traction system are as follows The starting tractive effort…
Electric Traction Objective Questions and Answers
1. Which of the following is an advantage of electric traction over other methods of traction ? (a) Faster acceleration (b) No pollution problems (c) Better braking action (d) All…
Calculate Power in Parallel RCL Circuit
An 800 Ω resistance, 100 Ω XL , and an 80 Ω XC are in parallel with a 120V, 60Hz source, as shown in Figure. Figure : Parallel R-C-L Circuit…
Calculate Power in Series RCL Circuit
An 8 Ω resistance, a 40 Ω XL, and a 24 Ω XC are in series with a 60 Hz source with a current flow of 4 amps, as shown…
Calculate Power in Parallel RC Circuit
A 30 Ω resistance and a 40 Ω XC are in parallel with a 120V power source, as shown in Figure. Figure : Parallel R-C Circuit Find: Current, IT Z…
Calculate Power in Series RC Circuit
An 80 Ω XC and a 60 Ω resistance are in series with a 120V source, as shown in Figure. Figure : Series R-C Circuit Find: Z Current, IT Power…
Calculate Power in Parallel RL Circuit
A 600 Ω resistor and 200 Ω XL are in parallel with a 440V source, as shown in Figure. Figure : Parallel R-L Circuit Find: Current, IT Power Factor, pf…
