RCDD EXAM QUESTIONS AND ANSWERS 2024

Material that carries a charge from one point to another Electrical conductor 100% conductivity Annealed Copper Adverse effect on copper Alloying Solid conductor (advantage) Better transmission Stranded conductor (advantage) More flexible AWG (acronym) American Wire Gauge (North America) PVC (polyvinyl chloride) Indoor PE (location) OSP Teflon (trademark) Du Pont FEP (trademark) Daikin America Halar (trademark) Solvay Solexis Measures voltage Dielectric strength Pair Twist (advantage) Minimize crosstalk Capacitance Electrical Inductance (mutual inductance) Magnetic field Pair twist (direction) Counterclockwise Tight twist (dim/reason) 0.5" (preserves shape) High cable temp (degree) Above 68 degrees High temp spaces (location) Exterior, ceiling, mech rooms Attenuation (def) Loss of signal Shield (types) Foil or braids Solid wall metal tube (def) Conduit Best shield (type) Conduit Poor shield effectiveness (dB) < 20 dB Fair shield effectiveness (dB) 20-40 dB Good shield effectiveness (dB) 40-60 dB Excellent shield effectiveness (dB) > 60 dB Poor effectiveness against magnetic fields Single or multiple layer braids Foil effectiveness Excellent Braid effectiveness Good Shield not properly grounded effectiveness Reduced Drain wires applied Longitudinally Analog signal Wave Analog signal example Sinusoid Human hearing (Hz) 20-20,000 hertz Voice telephone circuit (Hz) 300-3,400 hertz 1 kilohertz (Hz) 1000 hertz Phase = Time