____ is the measurement of an engine's ability to perform work in a specified time.
A. Energy
B. Horsepower
C. Momentum
D. Inertia
Answer: B
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¿Cuál de las siguientes operaciones se realiza comúnmente con una grapadora neumática en lugar de una clavadora?
a. Instalación de terminaciones b. Instalación de aislantes c. Construcción de armarios d. Instalación de estructuras interiores
A distillation unit is to be used to generate pure water vapor. 5.0 lbm/s of liquid water at 100oF enters the system, and 1.0 lbm/s of saturated water vapor leaves through one port and 4.0 lbm/s of saturated liquid leaves through a second port (along with impurities in the water which can be neglected in the analysis). The pressure throughout the whole system is 20 psia. A stirring system is used, which is powered by a 0.4 hp motor – assume that all of the motor’s work enters the system. All other energy is added through heat transfer.
(a) Determine the rate of heat transfer needed to produce this flow of saturated water vapor. (b) Using your separation chamber model, plot the heat transfer rates needed to produce saturated water vapor flow rates between 0.5 lbm/s and 4.0 lbm/s (along with corresponding changes to the saturated liquid water exit flow rates). State 1: Inlet stream; State 2: Saturated vapor exit stream; State 3: Saturated liquid exit. Given: P1 = P2 = P3 = 20 psia; T1 = 100oF; x2 = 1.0; x3 = 0.0; m?1=5.0lbm/s; m?2=1.0lbm/a; m?3=4.0lbm/a; W?=?0.4 hp=?0.283 Btu/s Assume: Given no other information regarding the mixing chamber, make the following common assumptions: ?KE=?PE=0. We are told there is heat transfer. Also, assume the mixing chamber is a single-inlet, multiple-outlet, steady-state, steady-flow device. What will be an ideal response?
A customer states there is a smell of natural gas when starting and shutting off her CNG fueled car. Technician A says a slight natural gas odor is normal. Technician B says a odor of natural gas indicates a leak. Who is correct?
A. Technician A B. Technician B C. Both A and B D. Neither A nor B