You are offered a choice of an incremental shaft encoder or an absolute shaft en

Question

You are offered a choice of an incremental shaft encoder or an absolute shaft encoder for the measurement of an angular displacement. What is the principal difference between the results that can be obtained by these methods? A shaft encoder is to be used with a 50 mm radius tracking wheel to monitor linear displacement. If the encoder produces 256 pulses per revolution, what will be the number of pulses produced by a linear displacement of 200 mm? A rotary variable differential transformer has a specification which includes the following information: Ranges: 30degree, linearity error 0.5% full range 60degree, linearity error 2.0% full range Sensitivity: 1.1 (mV/V input)/degree Impedance: primary 750 ohm, secondary 2000 ohm What will be the error in a reading of 40degre due to non-linearity when the RDVT is used on the 60degree range, and the output voltage change that occurs per degree if there is an input voltage of 3 V? What are the advantages and disadvantages of the plastic film type of potentiometer when compared with the wire-wound potentiometer? A pressure sensor consisting of a diaphragm with strain gauges bonded to its surface has the following information in its specification: Ranges: 0 to 1400 kPa, 0 to 35 000 kPa Non-linearity error: 0.15% of full range Hysteresis error: 0.05% of full range What is the total error due to non-linearity and hysteresis for a reading of 1000 kPa on the 0 to 1400 kPa range? The water level in an open vessel is to be monitored by a differential pressure cell responding to the difference in pressure between that at the base of the vessel and the atmosphere. Determine the range of differential pressures the cell will have to respond to if the water level can vary between zero height above the cell measurement point and 2 m above it. iron-constantan thermocouple is to be used to measure temperatures between 0 and 400degreeC. An What will be the non-linearity error as a percentage of the full-scale reading at 100degreeC if a linear relationship is assumed between e.m.f. and temperature? E.M.F. at 100degreC = 5.268 mV; e.m.f. at 400degreeC = 21.846 mV A platinum resistance temperature detector has a resistance of 100.00 ohm at 0degreeC, 138.50 H at 100degreeC and 175.83 H at 200degreeC. What will be the non-linearity error in degreeC at 100degreeC if the detector is assumed to have a linear relationship between 0 and 200degreeC? A strain gauge pressure sensor has the following specification. Will it be suitable for the measurement of pressure of the order of 100 kPa to an accuracy of 5 kPa in an environment where the temperature is reasonably constant at about 20degreeC? Ranges: 2 to 70 MPa, 70 kPa to 1 MPa Excitation: 10 V d.c. or a.c. (r.m.s.) Full range output: 40 mV Non-linearity and hysteresis errors: 0.5% Temperature range: -54 to + 120degreeC

Explanation / Answer

solution

2.10

total error =  +/- [.002][1400]

2.12

T = V

300C° = 16.578 mV
1C° = 0.05526 mV
100°C = 5.526 mV
5.526 - 5.268 = 0.258 =

0.258/5.268 = 0.049 5% ANS

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