1. A transducer converts

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Winfred Shepherd
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1 1. A transducer converts a. temperature to resistance b. force into current c. position into voltage d. one form of energy to another 2. Whose of the following transducers the output is a change in resistance? a. thermistor b. resistiver thermometer c. strain gauge d. all of the above 1

2 3. Which of the following is an output transducer? a. resistiver thermometer b. solenoid c. strain gauge d. thermistor 4. An amplifier is used a. to display the output signal b. as a power supply to an instrument c. to increase the signal from the transducer d. to filter noise from the input signal 2

3 5. What device is also known as a sensor a. output transducer b. input transducer c. any transducer d. none of the above 6. What type of energy can be converted into an electrical signal by an input transducer? a. force b. pressure c. heat d. all of the above 3

4 7. What type of transducer senses force? a. strain gauge b. potentiometer c. resistive thermometer d. none of the above 8. What type of output does a thermistor have? a. voltage b. current c. change in temperature d. change in resistance 4

5 9. The transducer in your home thermostat is an example of a(n) a. input transducer b. temperature transducer c. sensor d. all of the above 10. A resistance temperature transducer has a positive temperature coefficient. As the temperature rises the a. applied voltage increases b. applied voltage decreases c. resistance increases d. resistance decreases 5

6 11. The shots in the figure represent five consecutive measurements. The measuring system is a. not accurate or precise b. precise but not accurate c. accurate and not precise d. accurate and precise 12. A measuring system giving a different value when the input is increasing than when it is decreasing presents a. linearity error b. hysteresis error c. percentage error d. repeatability error 6

7 13. A signal conditioner is used a. to modify the signal for the final stage b. to amplify a weak signal c. to filter noise from the input signal d. all of the above 14. The measurement of performance of an instrument is known as a. sensitivity b. calibration c. signal conditioning d. readability 7

8 15. An instrument with a 30-cm scale would have a. a higher readability than an instrument with a 15-cm scale and the same range. b. a lower readability than an instrument with a 15-cm scale and the same range. c. the same readability with an instrument with a 15-cm scale and the same range. d. the same range with a 15-cm scale and the same resolution 16. A voltmeter with a range 0 to 5 Volts has 0.01 V resolution. Which of the following readings is impossible a V b. 1.1 V c V d V 8

9 17. A strain gauge a. used with a Wheatstone bridge converts a change in electrical resistance to a change in voltage b. converts displacement to a change in resistance c. is used to measure the elongation of an object d. all of the above 18. A potentiometer a. converts rotational movement to linear movement b. converts displacement to a change in voltage c. converts linear movement to rotational movement d. none of the above 9

10 19. L.V.D.T. stands for a. Low Voltage Differential Transformer b. Low Voltage Digital Transformer c. Linear Virtual Differential Transformer d. Linear Variable Differential Transformer 20. A L.V.D.T. a. consists of two primary and one secondary coil b. is used to measure a change in resistance c. is used to measure rotational movement d. none of the above 10

11 21. Which of the following is a digital sensor? a. strain gauge b. potentiometer c. contact switch d. L.V.D.T. 22. Measurement of displacement is the basis of measuring a. position b. stress c. force d. all of the above 11

12 23. Noise is a random variation of the value of the measured output as a consequence of a. environmental influence b. a weak signal c. a high resistance d. all of the above 24. Which of the following statements is correct? a. Sensors and transducers are both examples of actuators b. Sensors and actuators are both examples of transducers c. Actuators and transducers are both examples of sensors d. none of the above 12

13 25. What term describes the maximum expected error associated with a measurement or a sensor? a. Resolution b. Range c. Accuracy d. precision 26. Which of the following forms of temperature sensor produces a large change in its resistance with temperature, but is very non-linear? a. PlatinumP resistance thermometer b. Thermistor c. Thermocouple d. RTD 13

27. The image below shows a strain gauge. With the device oriented as shown, what is the direction of sensitivity of the device? a. Horizontal b. Perpendicular to the plane of the device c.

14 27. The image below shows a strain gauge. With the device oriented as shown, what is the direction of sensitivity of the device? a. Horizontal b. Perpendicular to the plane of the device c. Vertical 28. A thermal sensor that produces a voltage in proportion to the temperature is called: a. Resistive Temperature Device or RTD b. Thermistor c. Thermocouple d. Both (a) and (b) 14

5. Transducers Definition and General Concept of Transducer Classification of Transducers

5. Transducers Definition and General Concept of Transducer Classification of Transducers 5.1. Definition and General Concept of Definition The transducer is a device which converts one form of energy into another form. Examples: Mechanical transducer and Electrical transducer Electrical A