An examine-off instruction is true when the field device ____________________ (does, does not) supply a voltage to the input terminal and ____________________ (does, does not) allow logic continuity in its rung.
Fill in the blank(s) with the appropriate word(s).
does not, does
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Many bimetal strip type overload relays can be set for either manual or automatic reset.
Answer the following statement true (T) or false (F)
If 100 lbs. of force is applied to 1 sq. in. of area, how much fluid pressure is created?
A) 100 lbs B) 10 PSI C) 1 PSI D) 100 PSI
A curtain wall is typically used in buildings whose structural system consists of a
A) reinforced-concrete frame structure or steel-frame structure. B) load-bearing masonry wall structure. C) steel-frame structure or load-bearing masonry wall structure. D) load-bearing reinforced-concrete wall structure or load-bearing masonry wall structure. E) all of the above.
A periodic rectangular pulse train f(t) shown below has amplitude A = 1 V, pulse width ? = 0.35 ms, and period T0 = 1 ms. The pulse is centered at t = 0.
(a) Find the fundamental frequency f0 of this signal.
(b) Find the duty cycle d of this signal.
(c) Find the numerical values of a0, and an for 1 ? n ? 5.
(d) Plot the one-sided magnitude spectrum for 0 ? f ? 5f0.
(e) Plot the one-sided phase spectrum for 0 ? f ? 5f0.
(f) Find the expression of approximation ˆ( ) f t consisting of the dc component, the fundamental component, the second harmonic component, and the third harmonic component of its trigonometric Fourier series (sum of cosines). The coefficients must be numbers.
