Which is not a JFET terminal?
A) base B) source C) gate D) drain
A
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A power-limited Class 3 power supply must never exceed _________.
A. 30V, 100VA B. 150V, 100VA C. 300V, 100VA D. 600V, 1000VA
Mr. Cooper planted 750 acres of cotton. He made three trips over the field to prepare it for planting. He averaged 20 acres per tractor-hour per trip using 0.75 gallon of fuel per acre per trip at $3.18 per gallon. He treated the soil with 2 pints of an herbicide per acre at $98.92 per 2.5-gallon container. Mr. Cooper applied 225-85-155 units of fertilizer per acre using 46-0-0 urea at $509.73 per ton, 18-46-0 DAP at $708.75 per ton, and 0-0-60 muriate of potash at $571.43 per ton. He planted 58,000 seeds per acre with a germination of 88 percent. He had a yield of 2.1 bales per acre. He used a module builder 32 feet long, 7.5 feet wide, and 8 feet high with capacity of 12 bales. At the gin, his cotton was 33 percent fiber (lint).
a. What did the fuel cost to prepare the field for planting? b. What did the herbicide cost? c. What did the fertilizer cost? d. What was the total population using scientific notation with one decimal place? e. How many modules were harvested? f. How many bales of lint were produced?
In a certain community, levels of air pollution may exceed federal standards for ozone or for particulate matter on some days. For a particular summer season, let X be the number of days on which the ozone standard is exceeded and let Ybe the number of days on which the particulate matter standard is exceeded. Assume that the joint probability mass function of X and Y is given in the following table:
a. Find P(X=1 and Y=0).
b. Find P(X ? 1 and Y < 2).
c. Find P(X < 1).
d. Find P(Y ? 1).
e. Find the probability that the standard for ozone is exceeded at least once.
f. Find the probability that the standard for particulate matter is never exceeded.
g. Find the probability that neither standard is ever exceeded.
The electrodynamic shaker shown in Figure P18.49 is commonly used as a vibration tester. A constant current is used to generate a magnetic field in which the armature coil of length l is immersed. The shaker platform with mass m is mounted in the fixed structure by way of a spring with stiffness k. The platform is rigidly attached to the armature coil, which slides on the fixed structure thanks to frictionless bearings.
a. Neglecting iron reluctance, determine the reluctance of the fixed structure, and hence compute the strength of the magnetic flux density B in which the armature coil is immersed.
b. Knowing B, determine the dynamic equations of motion of the shaker, assuming that the moving coil has resistance R and inductance L. c. Derive the transfer function and frequency response function of the shaker mass velocity in response to the input voltage VS .
