¿Qué tamaño debería tener un conductor de cobre para un circuito de 240V, 1Ø que proporciona una carga continua de 27,5A a una distancia de 145' (44 m), y una caída de voltaje MÁXIMA de 3%?
a. N.° 6
b. N.° 8
c. N.° 10
d. N.° 12
b. N.° 8
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All the techniques used for the prevention of termite attack are based on keeping the wood in the structure ____ and making it as difficult as possible for termites to get to the wood.
a.dry b.moist c.fire-proof d.load-free
?Voltage is defined as electrical pressure and is measured in:
A. ?Volts B. ?Resistance C. ?Ampere's D. ?Ohm's
This problem concerns vapor-liquid equilibrium mixtures of compounds Q and W. We know that:
• The vapor pressure of pure compound Q is 0.5 bar at 300 K. • The vapor pressure of pure compound W is 1.0 bar at 300 K. A) If a liquid is composed of 40% Q and 60% W and at 300 K, give your best estimate of the bubble pressure and composition of the first bubble of vapor that WOULD be observed IF Q and W formed ideal liquid solutions. Q and W do not, in reality, form ideal solutions. In reality, for vapor liquid equilibrium at 300 K, there is an azeotrope at P=0.9 bar and T=300 K, in which the liquid and vapor phase both contain 40% Q. Use this fact—as well as the vapor pressure data given above—to answer questions B and C. B) Give your best estimate of the activity coefficients of Q and W in the azeotropic mixture at 300 K. C) Give your best estimate of the bubble pressure and composition of the first bubble of vapor in equilibrium with a liquid that is composed of 75% Q and 25% W at 300 K.
To relieve hydraulic system pressure when shutting down a tractor, the operator should _____
a. place the SCVs in the continuous detent position b. place the SCV control levers in the extend position c. cycle all SCV controls through all positions and then return them to neutral d. hold the SCV control levers in the retract position when the cylinders reach the end of travel