A gauge in a hydronic system reads 12 psig. What is the equivalent head pressure in feet of water?
a. 27.7 feet
b. 5.2 feet
c. 51.6 feet
d. 48 feet
a. 27.7 feet
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The ____________________ relay is actually a timer that contains a current operated coil instead of a voltage operated coil.
Fill in the blank(s) with the appropriate word(s).
Which of the following instruments can be used to measure any angle?
a. 45-45-90 drawing triangle b. Drawing compass c. Protractor d. Calipers
All of the following statements about hydraulic hybrid vehicles are true EXCEPT:
A. Hydraulic hybrid systems store high-pressure fluid in accumulators at pressures above 3,000 psi. B. Stored pressure provides power to one or more pump motors that provide power to the wheels. C. Regenerative braking is less efficient with hydraulic hybrids than with electric hybrids. D. During regenerative braking, the pump motors reverse, recharging the accumulator with pressure that can be used again for forward motion.
The power wire for a piece of air conditioning equipment should be sized using:
A) The minimum circuit ampacity listed on the equipment dataplate. B) Sum of the compressor RLA and the FLA of all fan motors. C) The locked rotor current of the all the equipment motors added together. D) The maximum overcurrent rating listed on the equipment dataplate.