Which of the following describes the basic operation of a single-slope A/D converter?
A) The input voltage is used to set the frequency of a voltage-controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading.
B) A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter.
C) A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate.
D) Any of the above could be correct, depending on the specific type of A/D converter involved.
C
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An insulated compressor is used to pressurize N2 gas from 100 kPa to 1200 kPa. The nitrogen enters at 20°C, and exits at 380°C. The mass flow rate of the nitrogen is 0.25 kg/s. Determine the power required to operate the compressor.
Given: P1 = 100 kPa; T1 = 20°C; P2 = 1200 kPa; T2 = 380°C; m?= 0.25 kg/s; N2 (Take State 1 as the inlet, State 2 as the outlet.) Assume: Q?=0 (insulated). For a compressor, assume steady-state, steady-flow, single-inlet, single-outlet flow, with ?KE = ?PE = 0 What will be an ideal response?
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What frame design combines the body with the structure of the frame?
A) Full frame B) Ladder frame C) Perimeter frame D) Unit body
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