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Sometimes either a PWM ac signal or a dc signal with a superimposed constant-frequency ac signal (or dither) is used to drive the valve actuator (torque motor) of a hydraulic actuator. What is the main reason for this? Discuss the advantages and disadvantages of this approach.
Why do you think that Leveson considers it so important to focus on the why aspect of an accident or incident?
Consider two actual power plants operating with solar energy. Energy is supplied to one plant from a solar pond at 80°C and to the other from concentrating collectors that raise the water temperature to 600°C. Which of these power plants will have a ..
strength of materials energy methodsa steel ring of mean diameter 250 mm has a square section 2.5 mm by 2.5 mm. it is
what is the suction specific speed for the pump that is operating under the conditions given in problem 14.16? is this
Quarterly demand for flowers at a wholesaler are as shown. Forecast quarterly demand for year 5 using: 1. simple exponential smoothing with α=0.1 2. using Holt's model with α=0.1 and β=0.1
1 a piston-cylinder contains 1.2 kg of saturated water vapor at an initial temperature of t1 200
Design a plywood beam bottom form shown as an alternative in Figure 12-4. The beam will be 14 in. × 24 in. First design the class I ply form to span the clear span between 2 × 4s (single span, maximum deflection of 1/16 in.).
A thermocouple with a sensitivity of 0.0225 /o mV F is used to measure temperature with a 16-bit A/D converter. If the full scale voltage of the A/D converter is 100 mV, What is the lowest temperature resolution? What is the range of temperature can ..
If the water enters at Tm,i = 500 K and the surface temperature of the tube is Ts = 510 K, determine the water outlet temperature Tm,o.
a rigid tank is connected by a valve to a supply line where refrigerant at 1.4 mpa and 100 degrees celsius flows
a heat pump with a cop of 2.4 is used to heat a house. the house is losing heat to the outside at an average rate of
germanium forms a substitutional solid solution with silicon. compute the weight percent of germanium that must be
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