Which of the two, PEL or TLV, is enforced by a standard?
What will be an ideal response?
PEL
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Dual-check valve backflow preventer assemblies are difficult for plumbers to remove, test, or replace because they _____.
a. have left-hand threaded connections b. do not have replaceable valve inserts c. are installed in very tight spaces d. are not normally fitted with shutoff valves or test cocks
The bits of an input port are normally HIGH via a 10 k pull-up. They can be made LOW
A) any time one of the DIP switches is closed. B) any time one of one of the DIP switches is disconnected. C) any time one of the DIP switches is opened. D) none of the above
The ideal cooling tower temperature of a lithium bromide absorption system is 85°F. What is a likely result if this temperature drops to 75°F?
A. high head pressure in the system B. low head pressure in the absorber C. removal of system load, compressor cylinders will unload D. crystalization occurs
After how many days of casting concrete in test cylinders, are they broken to determine the strength of concrete?
What will be an ideal response?