Describe spray-applied roof coatings.
What will be an ideal response?
?Spray-applied roof coatings consist of a polyurethane foam insulation layer applied to a deck and then topped with a protective coating. The protective coating is usually acrylic, polyurethane, or silicone. Sprayed polyurethane foam (SPF) provides a seamless, monolithic waterproof surface that adheres directly to substrate. Sometimes mineral granules or aggregate are applied to the wet top coating and used to provide additional protection.
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High impedance voltmeters can indicate some amount of voltage caused by the capacitance of the ground and induced voltage produced by surrounding magnetic fields. These are generally referred to as ____________________ voltages.
Fill in the blank(s) with the appropriate word(s).
If P1 = 400 kPa and T1 = 200°C, what is T2 when the piston hits the stops in the 16-cm-diameter cylinder? The mass of air is 0.1 kg.
A) 60°C
B) 55°C
C) 50°C
D) 45°C
If electric heating elements are used in conjunction with a heat pump, when do they operate?
A) The electric heating elements operate whenever the heat pump is not operating. B) The electric heating elements operate simultaneously with the heat pump. C) The electric heating elements operate in the first stage. D) The electric heating elements operate in the second stage.
A transformer has 10,000 turns of wire in the secondary and 100 turns in the primary. The transformer is connected to a line voltage of 120 volts. The output voltage will be ____________________.
Fill in the blank(s) with the appropriate word(s).