Which of the following information is not provided by P&ID symbols and tag numbers?
A. identifies the function of the instrument
B. shows how the instrument is mounted
C. identifies the loop number where it performs its operation
D. identifies the measured variable controlled by the loop
E. none of the above
Answer: E
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After removing a warranty part it is typically?
A. Thrown away immediately B. Given to the customer C. Returned to the parts specialist, tagged and stored D. Returned to the service manager or warranty clerk
A drive control that returns to neutral and locks when released is referred to as a(n) _____.
a. emergency cutout b. safety interlock c. deadman switch d. termination device
Why should some refrigerants NOT be recovered?
A) Type III refrigerant cannot be reused. B) Many machines hold too little refrigerant to recover. C) Older refrigerants have mostly dissipated already. D) Older machines may hold toxic chemicals.
What is the purpose of the shaft seal on an open compressor?
What will be an ideal response?