Two technicians are discussing "blowby." Technician A says that "blowby" is gases escaping past the valves. Technician B says that "blowby" is gases escaping past the rings. Which technician is correct?
A. Technician A
B. Technician B
C. Both technicians
D. Neither technician
Answer: B
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Why might closing the oxygen cylinder, then the acetylene cylinder, then bleeding first the oxygen line, then finally the acetylene line at the end of a brazing project create a hazardous situation?
A) The acetylene and oxygen cylinders should be closed simultaneously. B) The acetylene cylinder should be closed first. C) The last gas to go through the torch will be a flammable gas. D) The acetylene and oxygen lines should be bled simultaneously.
Why are face shields worn during arc welding?
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The main difference between an SN7402 and an SN5402 would be:
A) the SN5402 is able to operate over a wider range of temperatures and power supply voltages. B) the SN5402 contains NOR gates where the SN7402 contains NAND gates. C) the SN7402 contains NOR gates where the SN5402 contains NAND gates. D) the SN7402 is able to operate over a wider range of temperatures and power supply voltages.