Answer the following statement(s) true (T) or false (F)
1.In residential applications, Type NM cable is permitted to pass through environmental air handling spaces perpendicular to the long dimension of the space.
2.According to the NEC®, lighting fixtures must be installed in clothes closets.
3.According to the NEC®, all work spaces must be provided with illumination.
4.Residential electrical systems may be grounded using only the metal water pipe system and do not need a supplemental grounding electrode.
1.true
2.false
3.true
4.false
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Para todos los siguientes tipos de desgastes por contacto es necesario el reemplazo, EXCEPTO:
a. picadura excesiva de los contactos (no uniforme). b. contactos con insuficiente material de contacto. c. contactos con signos de desgaste irregular de la superficie. d. contactos con superficies onduladas.
A compound has the follOwing physical properties:
Critical Temperature = 1000 K Critical Pressure = 20 atm Boiling temperature at atmospheric pressure = 300 K Molar Volume of saturated liquid at atmospheric pressure = 0.1 L/mol Coefficient of Thermal Expansion for LIQUID is constant at 0.001 K-1 Isothermal Compressibility of LIQUID is constant at 5x10-4atm-1 Ideal Gas Heat Capacity is Cp*= 4R Heat capacity in the liquid phase is constant at Cv=0.3 L atm/mol K, In the gas/vapor phase, can be described by the equation of state: PV = RT + (BP3) Where B = 0.05 L mol-1atm-2 A) A stream of vapor enters a turbine at T=800 K and P=10 atm, and it leaves at T=500 K and P=2 atm. Find ?H and ?S for the vapor in this process. B) Derive general equations (i.e., valid for any fluid, not just this compound) that express ((??H)/(??V))_Tand ((??H)/?T)_?Ventirely in terms of measureable properties. Your expressions can include P, V, T, CP, CV, and/or their derivatives, as well as the gas constant R. C) The compound described above, initially in the liquid phase at T=300 K and P=1 atm, is placed in a rigid container and cooled to T=275 K. What is the change in molar enthalpy of the compound for this process?
What is the usability designation number of a stainless-steel electrode that has a lime coating, is the most
resistant to moisture, and tends to produce less porosity? a. -15 b. -16 c. -17 d. -26
Determine the OD of 3/4" pipe.
Fill in the blank(s) with the appropriate word(s).