Find i(t) for t > 0 in the circuit of Fig. 8.43.


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Name the flashing that is used around a pipe penetrating through a low-slope roof.

What will be an ideal response?

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Consider the wye-delta system shown in Fig. 12.60. Let Z? = 100 ?, Z? = j100 ?, and Z3 = –j100 ?. Determine the phase currents, IAB, IBC, and ICA, and the line currents, IaA, IbB­, and IcC.

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Most systems use a flap door that swings about ___________ degrees

A) 10 to 25 B) 25 to 40 C) 45 to 90 D) 90 to 120

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There are eight pole-zero graphs of system transfer functions in Figure E.48. Answer the following questions about their frequency responses, impulse responses and step responses. Frequency response:

(a) Which have a phase approaching zero at very high frequencies?

(b) Which have a phase that is discontinuous at zero frequency?

(c) Which have a magnitude approaching zero at high frequencies?

Step response:

(a) Which have a step response that is nonzero in the limit t ? ??

(b) Which have a step response that is discontinuous at t = 0?

Impulse response:

(a) Which have an impulse response that contains an impulse?

(b) Which have an impulse response approaching zero in the limit t ? ??

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