?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.
Answer: C
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?A method in which raised, rigid printing plates are inked and pressed against the plastics part while transferring an image is called ____.
A. ?letterflex B. ?plating C. ?letterpress D. ?engraving
Which of the following are considered to be "heavy metals" that can contaminate soils and the food chain?
A) cadmium B) lead C) zinc D) copper E) all of the above
Technician A says that the bulb trade number is the same for all bulbs of the same size. Technician B says that a dual-filament bulb has different candlepower ratings for each filament. Who is right?
A) A only B) B only C) Both A and B D) Neither nor B
Why is a pressure regulator necessary when using nitrogen cylinders?
A) To boost the pressure leaving the nitrogen cylinder high enough to be used B) Because the nitrogen must be carefully controlled since it is toxic C) Because the nitrogen is extremely expensive and must be carefully rationed D) To reduce the pressure in the nitrogen cylinder to a safe level