In a Wheatstone bridge, leg 1 is an active strain gage of Advance alloy and 120 ohms resistance, leg 4 is a similar dummy gage for temperature compensation, and legs 2 and 3 are fixed 120-ohm resistors. The maximum gage current is to be 0.030 amp. a. What is the maximum permissible d-c bridge excitation voltage? (Use this value in the remaining parts of this problem.) b. If the active gage is on a steel member, what is the bridge output voltage per 1,000 psi of stress? c. If temperature compensation were not used, what bridge output would be caused by the active gage increasing temperature by 100F° if the gage is bonded to steel? What stress value would be represented by this voltage? Thermal-expansion coefficients of steel and Advance alloy are 6.5 X 10-6 and 14.9 X 10-6 in./(in.-F°), respectively. The temperature coefficient of resistance of Advance is 6 X 10-6 ohm/ (ohm-Fº). d. Compute the value of a shunt calibrating resistor that would give the same bridge output as 10,000-psi stress in a steel member.
In a Wheatstone bridge, leg 1 is an active strain gage of Advance alloy and 120 ohms resistance, leg 4 is a similar dummy gage for temperature compensation, and legs 2 and 3 are fixed 120-ohm resistors. The maximum gage current is to be 0.030 amp. a. What is the maximum permissible d-c bridge excitation voltage? (Use this value in the remaining parts of this problem.) b. If the active gage is on a steel member, what is the bridge output voltage per 1,000 psi of stress? c. If temperature compensation were not used, what bridge output would be caused by the active gage increasing temperature by 100F° if the gage is bonded to steel? What stress value would be represented by this voltage? Thermal-expansion coefficients of steel and Advance alloy are 6.5 X 10-6 and 14.9 X 10-6 in./(in.-F°), respectively. The temperature coefficient of resistance of Advance is 6 X 10-6 ohm/ (ohm-Fº). d. Compute the value of a shunt calibrating resistor that would give the same bridge output as 10,000-psi stress in a steel member.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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