What effect do volatile liquids stored near the furnace have on its performance?
A) They damage vent work. B) They corrode furnace components.
C) They can produce flammable vapors. D) They help to create carbon monoxide.
C
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The characteristic of fuel-gas fittings that differentiate them from other types of fittings is fuel-gas fittings _____.
a. have right-hand threads b. have left-hand threads c. require lubricant for a proper seal d. require PTFE tape for a proper seal
What is the amperage of a 1,200-watt heater on a 120-volt circuit? Use the formula W = VA.
What will be an ideal response?
A technician needs to check the heating operation of a heat pump that has no gauge access ports. The technician should start by:
A) Check the temperature rise across the indoor coil. B) Recovering the system refrigerant using piercing pliers and installing permanent braze on service valves. C) Installing bolt on piercing valves on both the gas line and the liquid line. D) Installing bolt on piercing valves on both the high side and low side of the compressor.
In the circuit shown below, let R1 = 3 ?, R2 = 1 ?, C = 0.2 F, L = 2 H, v(0-) = 1 V, i(0-) = 3 A, is(t) = 3 u(t)
Draw the circuit in the s-domain and find Vo(s) and vo(t) for t ? 0.
