Mechanical Engineering Principles

(Dana P.) #1

278 MECHANICAL ENGINEERING PRINCIPLES



  1. A platinum resistance thermometer has
    a resistance of 24at 0°C. When mea-
    suring the temperature of an anneal-
    ing process a resistance value of 68
    is recorded. To what temperature does
    this correspond? Take the temperature
    coefficient of resistance of platinum as
    0. 0038 /°C(5)

  2. State which temperature measuring
    device would be most suitable to
    measure the following:


(a) materials in a high-temperature
furnace in the range 1800°Cto
3000 °C.

(b) the air in a factory in the range 0°C
to 35°C.

(c) an inexpensive method for food
processing applications in the range
− 20 °Cto− 80 °C.

(d) boiler flue gas in the range 15°Cto
250 °C. (4)
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