What problems can unintended reversal of direction cause?
What will be an ideal response?
Unintended reversal of direction can cause gear teeth to shear, chains to break, and the impeller of submersible pumps to unscrew off the end of the motor shaft. It can not only cause damage to equipment but also injury to operators or personnel in the vicinity of the machine.
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When an arrow cannot point to a joint, symbolization cannot be used.
Answer the following statement true (T) or false (F)
The optimum temperature for the growth of roots is ____________________ than the optimum temperature for top growth
Fill in the blank(s) with correct word
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.
Micrometers measure small clearances inside parts.
Answer the following statement true (T) or false (F)