When under severe braking, the wheels of a trailer lock causing it to spin around while the tractor remains in a straight-ahead position, the condition is known as:
A. jackknife
B. trailer swing
C. plow-out
D. brake fade
Answer: B
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What tool permits the use of mechanically produced letters and no unused leftovers?
a. press-on letters c. straightedges b. Ames lettering guide d. a lettering machine
The bulb of UVlamp should be cleaned daily and changed at least:
What will be an ideal response?
Which of the following is a correct statement regarding pipe threading?
A) Oil is not used during the threading process. B) The threading machine should be used to tighten fittings onto pipe. C) Once threading starts, it should continue until five threads extend past the die. D) A tripod-mounted power threader is controlled with a foot pedal.
The circuit shown in Figure P10.25 is a 9-V battery charger. The purpose of the Zener diode is to provide a constant voltage across resistor R2, such that the transistor will source a constant emitter (and therefore collector) current. Select the values of R2, R1, and VCC such that the battery will be charged with a constant 40-mA current.
Known quantities:
The circuit of Figure P10.25: IC = 40 mA; Transistor large signal parameters.
Find:
Design a constant-current battery charging circuit, that is, find the values of VCC, R1, R2 that will cause the transistor Q1 to act as a 40-mA constant current source.
Assumptions:
Assume that the transistor is forward biased. Use the large-signal model with ? = 100.