2542391
Description
Flashcards by giannini.chambers, updated more than 1 year ago
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Created by giannini.chambers
over 9 years ago
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| Question | Answer |
| Apparent Power | Voltage x current |
| Xl | 2πfL |
| Xc | 1/(2πfC) |
| STAR VOLTAGE | Vp=Vl/√3 |
| STAR CURRENT | IP=IL |
| DELTA VOLTAGE | VP=VL |
| DELTA CURRENT | Il=Ipx√3 |
| True Power | V x I x cos (Ө) |
| Watts in 1 horse power | 746 watts |
| Temperature coefficient of resistance formula | R=R0(1+α(T1-T0)) |
| Connections of an auto transformer | |
| Slip speed of a motor | ((Ns-Nr)/Ns) x 100 |
| What are the benefit of a wound-rotor induction motor? | Reduced starting current Increased available torque Is good for large initial loads |
| How do you calculate stator speed? | NS=f/p (p= pairs of poles) |
| What is the resonant frequency? | When Xl=Xc |
| What is a high pass filter? | A filter that passes high frequencies but blocks low frequencies |
| What is a low pass filter? | A filter that blocks high frequencies but allows low frequency signals |
| What is the bandwidth of a circuit? | The difference between the half power points either side of the resonant frequency. |
| Efficiency | Output/Input x 100 |
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