The efficiency of a heat pump operating in the heat mode tends to ____________________ as the outside air temperature drops.
Fill in the blank(s) with the appropriate word(s).
decrease
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Coolant is water and ________
A) Methanol B) Kerosene C) Glycerin D) Ethylene glycol
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Flat-rate times are given in hours and ____________________ of an hour.
Fill in the blank(s) with the appropriate word(s).
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The zener diode can be tested with an ohmmeter in the same manner as a common junction diode is tested, provided the ____ than the battery voltage of the ohmmeter.
A. zener voltage is less B. zener voltage is greater C. ground voltage is greater D. ground voltage is less
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The strength of concrete depends on the _____.
a. percentage of sand in the mix b. water-cement ratio c. type of cement used d. mixing time
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