Which of the following is when signals are multiplexed together by having them coexist in two different frequency ranges?
A. Frequency multipliers
B. Frequency-division multiplexing
C. Frequency-modulation
D. Preemphasis
B
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La cantidad mínima de entrenamiento teórico que se exige por año en un programa de entrenamiento para aprendices es de ______ horas.
a. 2,000 b. 200 c. 144 d. 250
Identify the following components
Match each item with a statement below.
A. Stored energy, like a gallon of gasoline or a ton of coal. B. Energy is neither created nor destroyed. C. Heat moves from high temperature regions to low temperature regions. D. Transfer of heat from one surface to another via electromagnetic waves. E. Results because cold air is denser than hot air, so hot air rises. F. Reduces the amount of moisture that diffuses through building materials into the wall structure.
What materials allow the flow of electrical current with ease?
A. Resistors B. Semiconductors C. Insulators D. Conductors