soln12b - 1 The Hong Kong Polytechnic University Department...

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Unformatted text preview: - 1 - The Hong Kong Polytechnic University Department of Mechanical Engineering 2008/09 Semester 1 ME4204 Mechatronic Systems Quiz 2 Student Name: Student ID: Programme Code: Date: Notes: Please answer ALL the questions. You may write your answer on separate sheets if necessary. Questions: Section A: (20%) 1. What is the total cycle of conversion time of a 4-bit successive approximation Aanalog-to- Digital Converter? _____ c (a) 3 cycles (b) 4 cycles (c) 5 cycles (d) 6 cycles 2. What is the number of separate voltage comparators used in a 4-bit flash ADC? _____ a (a) 15 (b) 12 (c) 8 (d) 4 3. What is the minimum sampling rate for an 100Hz analog signal without alias? ____ b (a) 300 Hz (b) 200 Hz (c) 100 Hz (d) 50 Hz 4. What is the full-step angle for a 5-pole, 2-phase stepper motor? _____ d (a) 4.5 ° (b) 9 ° (c) 18 ° (d) 36 ° 5. Which of the following components does not include in a microcontroller? _____ a (a) Replicator (b) Register (c) ROM (d) Watchdog Section B: (80%) 1. The initial conditions of a shunt wound d.c. motor are: K φ = 3.0 Vs V 1 = 24.0 V T d = 18 Nm R a = 2 Ω where K is a constant dependent on the motor design parameters, φ is the flux, V 1 is the applied voltage, T d is the output torque developed, and R a is the armature resistance. (a) Draw a schematic circuit diagram for a shunt wound d.c. motor. (10 marks) (b) Show that the motor has the following speed − torque characteristic is: - 2 - ( ) d a t T K R K V ⋅ − =...
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This note was uploaded on 01/16/2010 for the course ENG 91301 taught by Professor Lui during the Spring '08 term at Hong Kong Institute of Vocational Education.

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soln12b - 1 The Hong Kong Polytechnic University Department...

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