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Question 45481

posted 10 months ago

Given in the figure below the response of a thermocouple in time domain. The x-axis represents time in (ms) and the y-axis represents voltage in (mV).
a) Find the time constant.
b) Find the response time.
c) What is the relation between the time constant and the response time? (1 mark)

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Question 45479

posted 10 months ago

A water main of a circular cross-sectional area 5.50 m² has water flowing through it. It was noticed that the water was not flowing at normal speed and the testing engineer decided to use Hall sensor to measure the velocity of water. A magnetic field is applied across the main of value 0.756 uT. The sensor reads a Hall emf of value 2.75 µV.
a) What is the velocity of water if the flow is perpendicular to the applied field. (1.5 marks)
b) What is the percentage reduction in the velocity of the flow if under normal conditions,water moves from point A to B in 0.5 s.(2.5 marks)

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Question 45478

posted 10 months ago

Select any mechatronic system of your choice that uses at least 2 types of sensors that have been discussed in the lecture.
a) Discuss its application.
b) Explain the operation of each sensor within the mechatronics system.

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Question 45480

posted 10 months ago

Find Poisson's ratio for a strain gauge of gauge factor equal to 6. When a force is applied to it,it caused a strain equal to 462 µE. Given that the unstained resistance of the gauge is 250 2and the change in its resistivity is 1.78 x108 ohms.cm. The gauge's wire along its dimensions are shown below.

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Question 41850

posted 11 months ago

Figure (a) below shows the construction of a tunable capacitor that is actuated by using electrostatic force between the high-aspect ratio, inter digitated fingers. All the fingers connected to port-1 are free to move in the direction shown in Figure (a), and all the fingers that are connected to port-2 are stationery. Port-2 fingers are suspended bya set of springs, and an overall spring constant of k is defined for lumped modeling. Figure (b) shows the details ofa stationery-movable finger arrangement with the design geometries. Note that the overall tunable capacitor is the arca modulated capacitor (CI) and there is an overall parasitic capacitor at the cnd of the finger modeled with Cp.Number of finger pairs is N, the device is operating in air, heavily damped and all the fringing capacitances can be ignored. Find symbolic expressions in (a), (b), (c) as a function of geometries and k.
(a) Find expressions for Cp and C1. Assuming stationery values for these caps as CPo and C10, find the tendency of these caps with changes in displacement in r-direction.
(b) Assume a voltage drive between ports I and 2. What is the maximum stable displacement xmax of the device?
(c) Find the maximum value of the tuning capacitance for stable actuation.
(d) Use N = 300, one-side length of one of the springs' length (i.e. from the anchor to the truss) L = 500 um,spring width w = 1 µm, d= 2 µm, h = 50 um, wf = 4 µm, xf = 30 um, re = 10 µm. Calculate the values of Cpo and C10, the maximum stable displacement and the maximum value of the tuning capacitance Cimaz-

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Question 41851

posted 11 months ago

Figure below shows a cantilever type scanner that is actuated by using electromagnetic force/torque. There is a single-loop coil with negligible pitch to the edge of the mirror (i.e. rectangular coil width and length can be assumed as W and D). The spring can produce out-of-plane (call it mode-1) and torsional (call it mode-2) displacements around the suspension. Use Silicon as the structural material which has a uniform thickness of t, and a density of p,ignore the mass of the spring. Spring width is a and spring length is L. Mechanical quality factors of mode-1 andmode-2 are Q1 and Q1, respectively. You may denote the necessary material constants with subscript Si, in case you need to use them (e.g. Young's modulus of Silicon Esi).
(a) Find expressions for resonance frequencies of out-of-plane motion and torsion about spring length direction.
(b) When an external, in-plane B-field of 1 Tesla is imposed with a 45 degree inclination to the mirror plate, what would be the "resonant" rotation angles for mode-1 and mode2 if we pass an ac current with a magnitude ofI?
(b) When an external, in-plane B-field of 1 Tesla is imposed with a 45 degree inclination to the mirror plate, what would be the "resonant" rotation angles for mode-1 and mode2 if we pass an ac current with a magnitude ofI?

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Question 38786

posted 1 years ago

If a transformer is used to increase the output voltage, then it is called?
a. Step up transformer
O b. Non of the answers
O c. Step down transformer
O d. Isolation transformer

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Question 38791

posted 1 years ago

Mechatronics is an interdisciplinary field of engineering that is comprised of ?
O e. Non of the answers
O b. Mechanical and Computer enigneering
O d. Mechanical, Electrical and Computer engineering
a. Computer and Electrical Engineering
O C. Mechanical and Electrical

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Question 38797

posted 1 years ago

A Transformer, is a device that transfers electric energy from one alternating-current circuit to one or more other circuits
The output voltage in an isolation transformer is
The output voltage in an isolation transformer is

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Question 38800

posted 1 years ago

If you have a microcontroller and actuator, you need to have one of the following so the microcontroller can communicate properly with the actuator.
O a. Graphical interface
O b. Input signal conditioning and interfacing
O c. Output signal conditioning and interfacing
O d. Digital architecture

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