soln12a - The Hong Kong Polytechnic University Department...

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The Hong Kong Polytechnic University Department of Mechanical Engineering 2008/09 Semester 1 ME4204 Mechatronic Systems Quiz 1 Student Name: Student ID: Programme Code: Date: Please answer ALL the questions and write your answer on separate sheets if necessary. Questions: Section A: (10%) 1. Which one is the correct expression of Ohm’s Law? _____ (a) V = R/I (b) R = VI (c) V = I/R (d) R = V/I 2. What is the total current I of the given circuit? _____ (a) I = 1.7A (b) I = 2.8A (c) I = 3.3A (d) I = 4.6A 3. Which of the following is NOT a function of grounding? ____ (a) Overvoltage protection (b) Overcurrent protection (c) Noise reduction (d) Voltage stabilization 4. Which of the following transducers are NOT self-generators? _____ (a) thermocouple (b) silicon solar cell (c) rotary potentiometer for angle measurement (d) mercury-in-glass thermometer - 1 - 5. Which of the following is precise but not accurate? (a) (b) (c) (d)
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Section B: (40%) 1. Let us consider a sensor, a signal amplifier, and a measurement device all connected in series as shown in Fig. 1. The sensor provides a voltage proportional to the measured physical variable. Given that voltage v s (t) = 10V at steady-state condition. Assume the gain of the amplifier is unity, K amp = 1.0V. (a) Determine the voltage measured at the measuring device for the following two conditions:
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soln12a - The Hong Kong Polytechnic University Department...

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