Although shielding gases are not toxic, they _____. a. are ...

[lidoalex]

Although shielding gases are not toxic, they _____.
 
  a. are highly explosive
  b. can decompose into toxic gases
  c. can displace oxygen when released in a large quantity
  d. cause rapid metal corrosion

Question 2

When installing grooved pipe couplings, the coupling housing halves are tightened together until _____.
 
  a. they have a 1/8 gap between them
  b. the required bolt torque is reached
  c. there is a 1/4 gap between them
  d. they touch

[thall411]

Answer to Question 1

c

Answer to Question 2

d

[lidoalex]

Thanks for the timely response, appreciate it

[kilada]

Wow, this really help