Mixing valves control the final temperature of radiant loops:
A) By bleeding off some of the hot water before it enters the loop.
B) By mixing the hot boiler water with fresh makeup water.
C) By mixing the hot water from the boiler with the cold water from the chiller.
D) By mixing the hot boiler water with cooler return water.
D
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The ____ emits a high-frequency sound wave and then detects the echo when it bounces off the object.
a. photodetector b. ultrasonic detector c. proximity detector d. proximity sensor
The enforcement of a building code is usually done at the level of the ______.
A) country in which the building is located. B) county in which the building is located. C) state in which the building is located. D) city in which the building is located.
Some scan tools provide a(n) ____ function that will query all of the modules on the bus to respond and then list those that did reply.
A. burst scan B. active scan mode C. vehicle module scan D. alert module scan
Given there is a voltage across a resistor as shown below, what direction are electrons (not current) flowing through the resistor?
A. from right to left B. there is no electron flow through this resistor C. in both directions simultaneously D. from left to right