?In a system controlled by a high-limit controller, what is sometimes used to blend cool water returning from the heat emitters with heated water from the heat source?

A. ?3-way pressure valve
B. ?3-way mixing valve
C. ?pressure relief valve
D. ?make-up water system


Answer: B

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Describe the type of vehicle load condition that requires variable-rate springs.

What will be an ideal response?

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What will be an ideal response?

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Mechanically held relays and contactors are often used because _____.

a. they have fewer coils than electrically held devices b. they have more coils than electrically held devices c. they are quieter than electrically held devices d. they are more reliable than electrically held devices

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N-type material is silicone doped with which of these?

A) Antimony B) Arsenic C) Phosphorous D) Any of these

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