For every one PSI increase in cooling system pressure, the coolant's boiling point is raised how many degrees F?
A) One B) Five C) Three D) Two
C
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Types of dynamic superchargers are being discussed. Technician A says the pressure wave is used mostly for two-stroke diesels. Technician B says a centrifugal supercharger is is crankshaft driven, rather than exhaust driven. Who is right?
A. Technician A B. Technician B C. Both technicians D. Neither technician
A(n) ____________________ switch is used when a light or group of lights, or other load, must be controlled from one switching point.
Fill in the blank(s) with the appropriate word(s).
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.
?What is the relationship between head energy and pressure in a closed-loop hydronic system?
A. ?When head is lost, pressure increases. B. ?When head is gained, pressure increases. C. ?Both remain relatively constant. D. ?When head is lost, temperature increases.