1. Use suitable sketches to describe the principle of operation of a resistance strain gauge. 2. Calculate the strain experienced by a rođ of length 2m subjected to a force that causes a change of resistance of 0.2x 1012 in the gauge Wheatstone bridge circuit. The strain gauge has gauge factor of 1.5 and the resistivity of the Wheatstone bridge circuit wires is 1.83x10 ohm-meter having a cross-sectional area 0.03m² and length 0.15m.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Please answer the all of Question one
Question 1
1. Use suitable sketches to describe the principle of operation of a resistance strain gauge.
2. Calculate the strain experienced by a rod of length 2m subjected to a force that causes a
change of resistance of 0.2x 102 in the gauge Wheatstone bridge circuit. The strain
gauge has gauge factor of 1.5 and the resistivity of the Wheatstone bridge circuit wires is
1.83×10* ohm-meter having a cross-sectional area 0.03m² and length 0.15m. |
Question 2
1. Discussthe Seebeck effect.
2. When the cold junction of a thermocouple thermometer is at 10°C and the hot junction at
80 °C, the millivoltmeter shows a deflection of 3.5 mV towards the left. The hot junction
is now put in an unknown temperature while maintaining the cold junction at 10°C. The
millivoltmeter now shows a deflection of 4.7 mV towards the left. Calculate the unknown
temperature.
Question 3
1. Derive the Rowing equation that relates velocity to pressure drop for the Pitot tube.
000 00
2(P2-P.)
V =
2. A Pitot tube flow meter is installed in a horizontal cooling tower water return pipe that
has a diameter of 300mm. A differential pressure reading of 1 kPa is obtained from the
sensor.
Determine the following:
(i) the velocity of water in the pipe,
(ii) the volumetric flow rate of water in the pipe,
Transcribed Image Text:Question 1 1. Use suitable sketches to describe the principle of operation of a resistance strain gauge. 2. Calculate the strain experienced by a rod of length 2m subjected to a force that causes a change of resistance of 0.2x 102 in the gauge Wheatstone bridge circuit. The strain gauge has gauge factor of 1.5 and the resistivity of the Wheatstone bridge circuit wires is 1.83×10* ohm-meter having a cross-sectional area 0.03m² and length 0.15m. | Question 2 1. Discussthe Seebeck effect. 2. When the cold junction of a thermocouple thermometer is at 10°C and the hot junction at 80 °C, the millivoltmeter shows a deflection of 3.5 mV towards the left. The hot junction is now put in an unknown temperature while maintaining the cold junction at 10°C. The millivoltmeter now shows a deflection of 4.7 mV towards the left. Calculate the unknown temperature. Question 3 1. Derive the Rowing equation that relates velocity to pressure drop for the Pitot tube. 000 00 2(P2-P.) V = 2. A Pitot tube flow meter is installed in a horizontal cooling tower water return pipe that has a diameter of 300mm. A differential pressure reading of 1 kPa is obtained from the sensor. Determine the following: (i) the velocity of water in the pipe, (ii) the volumetric flow rate of water in the pipe,
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