Los relés térmicos de sobrecarga detectan la corriente del motor por:
a. conversión de la corriente en calor en un elemento de resistencia.
b. vibraciones del motor.
c. el uso de un termostato.
d. un voltímetro conectado.
a. conversión de la corriente en calor en un elemento de resistencia.
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An insulated steam turbine is to produce 100 MW of power. Superheated steam enters the turbine at 12 MPa and 600°C, and saturated water exits the turbine at a pressure of 80 kPa. There are two design constraints to be considered:
(1) The turbine blade design requires that the quality of the steam to be no less than 0.90 to maintain blade durability. (2) The maximum mass flow rate of steam that the system can utilize is 100 kg/s. Plot the mass flow rate of steam necessary to produce 100 MW of power for exit qualities ranging from 0.9 to 1.0, and then determine the range of exit qualities that satisfy both design constraints. Determine the necessary mass flow rate of the steam. Given: P1 = 12.0 MPa; T1 = 600°C; W?=100 MW=100,000 kW; P2 = 80 kPa; Steam State 1 is the inlet, state 2 is the outlet. Assume: Q? = 0 (insulated) Also, for a turbine, assume steady-state, steady-flow, single-inlet, single-outlet flow, with ?KE = ?PE = 0
Smooth muscle _____
a. is generally red in color c. cannot stretch b. is not attached to the skeleton d. is the fastest muscle
Shafts manufactured for use in optical storage devices have diameters that are normally distributed with mean µ = 0.652 cm and standard deviation ? = 0.003 cm. The specification for the shaft diameter is 0.650 ± 0.005 cm.
a. What proportion of the shafts manufactured by this process meet the specifications? b. The process mean can be adjusted through calibration. If the mean is set to 0.650 cm, what proportion of the shafts will meet specifications? c. If the mean is set to 0.650 cm, what must the standard deviation be so that 99% of the shafts will meet specifications?
Phosphoric acid fuel cells ____________________
A. can achieve a 90% efficiency by utilizing a combined heat and power system that recaptures waste heat B. have an efficiency that is currently only 30% C. must be pad mounted outside to control the noise generated D. take hydrogen and reform it into sulfur oxides