When a transformer steps up the voltage, it steps down the ____ so the output power remains the same.
A. resistance
B. current
C. capacitance
D. inductance
Answer: B
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ASTM C150 covers _____ types of portland cement, but only _____ are recommended for use in masonry mortars.
A. four; two B. five; four C. seven; five D. eight; three
Give one location where an RPZ backflow preventer should not be installed.
What will be an ideal response?
The performance of an air-conditioning system can be determined by measuring the airflow and:
A) The dry-bulb temperature difference across the condenser. B) The dry-bulb temperature difference across the evaporator coil. C) The wet-bulb temperature difference across the condenser. D) The wet-bulb temperature difference across the evaporator coil.
In which of these situations is it necessary to use outdoor air for combustion on an induced-draft furnace?
a. It is always necessary. b. In locations where the outdoor temperature does not fall below 32°F. c. When the furnace is within 50' of a living space. d. When there are chemicals near the furnace