Glycol solutions are added to water in secondary refrigerant loops:
A) To increase the system heat transfer. B) To prevent freezing and inhibit corrosion.
C) To lubricate the circulating pump bearings. D) To make leaks easier to locate.
B
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Common grains used to feed gerbils include corn, oats, wheat, and ____________________
Fill in the blank(s) with correct word
What is a rotameter used for?
What will be an ideal response?
Regarding Isometric views, which of the following statements IS not true?
a. Hidden lines are omitted unless they are needed to make the drawing clear. b. Centerlines are drawn if they are needed to indicate symmetry. c. Nonisometric points and surfaces may be located by the offset location method. d. Angular measurements may be measured directly. e. The isometric axes form angles of 120°
Answer the following statement(s) true (T) or false (F)
1. DC motors are most common in residential applications and include most household applications such as garbage disposal motors, furnace blower motors and air-conditioning compressor motors. 2. As the motor is installed, the nameplate information is needed to properly install the motor in a safe and efficient matter. 3. A general-use snap switch may not be used as a controller if it has an ampere rating that is more than twice the full-load current rating of the motor. 4. Electricians typically connect the branch-circuit power and the local disconnect (a switch) for the furnace power, and all the rest of the controls for the fan are external to the furnace controls. 5. Most DC motor installations recently installed have electronic controls in which much of the overload protection is part of the solid-state control circuitry.