Inverter-controlled welding machines are smaller, lighter power sources that also _____
a. offer a very smooth and steady DC welding arc
b. offer a very smooth and steady AC welding arc
c. use significantly more power to operate
d. reduces the AC power frequency well below 60 Hz
a
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This type of drive axle joint is called a(an) ________.
A) U-joint
B) Ball joint
C) Rzeppa joint
D) Plunge joint
Improvised explosive devices (IEDs) are responsible for many deaths in times of strife and war. Unmanned ground vehicles (robots) can be used to disarm the IEDs and perform other tasks as well. If the robots cost $140,000 each and the Military Arms Unit signs a contract to purchase 4000 of them now and another 6000 one year from now, what is the equivalent annual cost of the contract over a 4year period at 10% per year interest?
What will be an ideal response?
Which of the following is NOT considered an ozone-depleting chemical?
A) Halons B) Hydrochlorofluorocarbons C) Chlorofluorocarbons D) All of these are considered ozone-depleting chemicals
When electric strip heat is used with a heat pump, when is the electric strip heat energized?
A) the heat pump comes on in first stage and the strips in second stage B) both the heat pump and the strips come on in second stage C) both the heat pump and strips come on in first stage D) the electric strip heat comes on in first stage, and the heat pump in second stage