What is the correct description of Charles' law?
A. There is a definite relationship between the pressure and volume of a gas if the temperature is kept constant.
B. There is a definite relationship between the volume and temperature of a gas if the pressure is kept constant.
C. The total pressure of a confined mixture of different gases is equal to the sum of the pressure of each gas in the mixture.
D. Energy can be changed in form but cannot be created or destroyed.
Answer: B
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A. It changes the approach. B. It increases. C. It decreases. D. It stays the same.
The contactor sequence for the circuit shown in Figure 2 is such that during the transition from reduced-voltage operation to full-voltage operation, the energized contactors are 2S and _____.
a. 1S
b. TR
c. T1
d. R
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Indicate whether this statement is true or false.
A ____ arc prevents metal from being deposited ahead of the weld bead.
A. short B. short to medium C. medium to long D. long