1. (Chapter 13: Sensor technologies). When transmitted through air, the speed of

Question

1. (Chapter 13: Sensor technologies). When transmitted through air, the speed of ultrasound is affected by environmental factors such as temperature, humidity and air turbulence. For example, the velocity of sound, V, through air varies with temperature, T, as follows V-331.6+0.6T (m/s) If we have higher moister in the air, the ultrasonic sensors will detect a velocity a) Higher than one in a normal humidity b) Lower than one in a normal humidity c) Almost same (Chapter 14 Temperature measurement) Which description of thermoelectric effect sensors (thermocouple) is NOT true? a) Thermoelectric effect sensor is comprised of pairs of materials b) Thermoelectric effect sensor is made by materials connected together at one end d) Voltage (emf) is a function of T described approximately as e a T 2. ) Temperature chisic for em cou e mc e) Thermoelectric effect sensors are usually measured in a range of temperature from0 through 400 C

Explanation / Answer

Sound travels slightly faster in humid air than dry air. So ultrasonic sensor will detect a velocity higher than one in normal humididty. So option A is true.

Temperature range: Most practical temperature ranges, from cryogenics to engine exhaust, can be served using thermocouples. Depending on the metal wires used, a thermocouple is capable of measuring temperature in the range –200°C to +2500°C.

So option E is not true.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.