What agency is responsible for certifying safety boots and shoes?
A. U.S. Government.
B. Your employer.
C. EPA.
D. Underwriters Laboratories (UL).
Answer: D
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Pressures are controlled in an orifice tube (OT) system by ________.
A) Using a variable valve B) Cycling an electromagnetic compressor clutch on and off as needed C) Using a variable displacement compressor D) Either B or C
Technician A says that the most common cause of trailer landing gear failures is crank gear tooth failure. Technician B says that landing gear is designed to sustain vertical weight forces and not the effects of the horizontal ramming that takes place during coupling. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Should heating and cooling coil exterior surfaces ever be cleaned?
What will be an ideal response?
?Which of these is an advantage of a thermostatically controlled tankless electric water heater?
A. ?It enables easy removal of the internal coil heat exchanger for cleaning. B. ?It has a large reserve of domestic water in the assembly that inhibits biological growth. C. ?It takes advantage of low initial temperatures when domestic water heating begins. D. ?It uses fewer valves than traditional pressurized tank thermal storage.