Question

An instrument used to measure high temperature is
A. Pyrheliometer
B. Pyrometer
C. Tachometer
D. Pycnometer

Answer 1

Hint: The body having high temperature will produce some radiation due to the heat generation. So, to measure the high temperature we can get the value of the temperature of the body by sensing the radiation which is coming from the body. So, we need a device which is a remote sensing device and is able to detect the radiation to measure the high temperature.

Complete answer:
So, to measure the high temperature the device is called a Pyrometer, and this is used for measuring the high temperature of the furnace. It contains a remote sensing thermometer, which measures the temperature of the surface.
Principle of the pyrometer- it measures the temperature of the object by sensing the hat or the radiation emitted from the object without making contact with the object. The temperature level is recorded depending on the intensity of the radiation radiated from the body.
Since the pyrometer is absorbing and measuring the EM wave intensity at any wavelength that’s why it acts like a photodetector.

So, the correct answer is “Option B”.

Note:
Advantages of the use of the pyrometer-
a.)Can measure the temperature without making contact with the object. Gives a fast response.
b.)Good stability while measuring the temperature of objects.
c.)Gives a fast response.
d.)It can be used to measure the temperature of the surface which is not accessible in person.

Disadvantages of the pyrometer-
a.)It is very expensive.
b.)Also Rugged.
c.)Surrounding conditions like Smoke, dust, and thermal radiation can affect the accuracy of the readings of the pyrometer.