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Exam II

Exam II. Exam 2. 1. (20 pts) Short questions: (4 pts) What does power factor equal one imply? Power supplied by the source is dissipated on the resistor. Or: the load is resistive. Or: The imaginary part of complex power is zero.

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Exam II

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  1. Exam II

  2. Exam 2 1. (20 pts) Short questions: (4 pts) What does power factor equal one imply? Power supplied by the source is dissipated on the resistor. Or: the load is resistive. Or: The imaginary part of complex power is zero. (4 pts) How do you distinguish 120 V and 240 V outlets at your home? 120V: three prongs 240V: Four prongs (4 pts) How does the “ground fault circuit interrupter (GFCI)” work? Detect the current difference between the hot and ground wires. If the value is larger than a set value, it will disconnect the hot wire. (4 pts) List two advantages of using digital circuit? Functions are easy to achieve with circuits High accuracy (e) (4 pts) State the phase relation between current and voltage for capacitive load and inductive load, respectively. Capacitive load: current leads voltage Inductive load: Voltage leads current.

  3. Exam 2: 2 Green Supercell: C Red supercell: A Blue supercell: B’ f((A,B,C)=A+B’+C

  4. Exam 2: 3 Q00 1 Q2Q1 00 1 0 01 1 0 11 x x 10 0 x D0=Q2’Q0’=( Q2+Q0)’= Q2 NOR Q0 Q00 1 Q2Q1 00 0 1 01 1 0 11 x x 10 0 x D1=Q0’Q1+ Q1’Q0 = Q2 XOR Q0 D2=Q0Q1 = Q0 AND Q1

  5. Instrumentation: ground and noise Temperature Measurement

  6. Grounding

  7. Noise Sources and Coupling • Noise sources are always present and are often impossible to eliminate completely. • Sources: fluorescent light fixtures, video monitors, power suppliers, switching circuits, high voltage (current) circuits. • Affect measuring circuit by: conductive coupling, capacitive coupling, inductive coupling, and radiative coupling.

  8. Conductive Coupling Large current flowing through the load causes Va Vb. Solution:

  9. Capacitive Coupling: Electric Field Solution: Shielding

  10. Inductive Coupling: Magnetic Field Hard to eliminate: shielding and twisted-pair wire

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