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Criado por giannini.chambers
mais de 9 anos atrás
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Questão | Responda |
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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