It has been proven that currents as small as ____ milliamperes through the heart, lungs, or brain can be fatal.
A. 15
B. 50
C. 5
D. 25
Answer: B
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We meet a very large part of our energy needs with _____
A) renewable resources B) wind power C) water power D) fossil fuels
Before starting to change a belt on a belt drive blower, the technician should:
A) Turn the power to the unit off and lock it out. B) Put on heavy work gloves in case the unit is inadvertently started while changing the belt. C) Turn the thermostat off and leave instructions not to turn it on. D) Wedge a metal bar between the pulley and the unit housing to prevent it from starting.
What controls the length of the defrost cycle on most commercial refrigeration systems?
A) The high-pressure switch B) The defrost termination thermostat C) The evaporator fan motor D) The defrost timer
All pressure measurements are made against a reference pressure. The reference pressure for psig is __________.
A. a vacuum B. atmospheric pressure C. 0 inches of water column D. 100 inches of water column