Test: Measurement of Temperature - Electronics and Communication Engineering (ECE) MCQ

The characteristics of a thermometer measuring ambient temperature are 2 + T_i - T_a = 0 where Ti and Ta are the indicated and ambient temperatures, respectively, both in C, and time is in seconds. The – 3 dB cut-off frequency in the frequency response of the thermometer is

For a copper-constantan (Type T) thermocouple, the junction potential E (in V) at C is given

by E = 38.74θ + 3.3 x 10^{– 2} θ ² + 2.07 x 10^{– 4} θ ³ – 2.2 x 10^{– 6} θ ⁴ +higherorderr terms, assuming the cold junction compensation. The sensitivity of thermocouple at 100C is approximately

Match the following :

The values of the material constants for thermistors P and Q are 4000 K and 3000 K, respectively. The resistance of each thermistor at 298 K is 2 kΩ . At 373 K, the ratio of the resistance of thermistor P to that of thermistor Q will be closest to

A type J (iron-constantan) thermocouple has a voltage sensitivity of 55 μV/C. A digital voltmeter (DVM) is used to measure the voltage under the condition shown in the following

figure.

Given that T₁ = 300C, T₂ = 100C and T₃ = T₄ = 20 C, the meter will indicate a voltage of

A thermometer at room temperature 30C is dipped suddenly into a bath of boiling water at 100C. It takes 30 seconds to reach 96.5C. The time required to reach a temperature of 98 C is

A mercury barometer reads h mm Hg with the temperature of the mercury at T C. The barometer reading corrected for the standard temperature 0 C with β denoting the volumetric

The expansion coefficient of mercury in 0 C^{– 1} is

A temperature-measuring instrument is modeled as a first-order system with a time constant of 5s. The sensor of the instrument is placed inside an oil bath whose temperature has a sinusoidal

variation with an amplitude of 10 ⁰C and a period of 20s around an average temperature of 200 ⁰C.

The sinusoidal component at the output of the instrument will have amplitude.

Data given below should be used for answering questions

The table provides the thermo-emf sensitivity of five materials concerning platinum around 273 K

The thermocouple pair that gives the maximum sensitivity around 273 K is

Data given below should be used for answering questions

The table provides the thermo-emf sensitivity of five materials concerning platinum around 273 K

Two copper -constantan thermocouples are connected such that the two constantan wires are joined together. The two copper wires are connected to the input of a low noise chopper stabilized differential amplifier having a gain of 1000. One thermocouple junction is immersed in a flask containing ice and water in equal proportion. The other thermocouple is at a temperature of T.

If the output of the amplifier is 2.050 V, the temperature T is

A thermocouple is suddenly immersed in a medium of high temperature. The approximate

time taken by the thermocouple to reach 98% of the steady-state value is

The sensing element of a thermocouple at its hot junction is provided with a shield while taking measurements in a high-temperature gas. The principal reason for giving the shield is

In the context of transducers, identify the correct matches List I with List II :

Which of the following is used as an indication instrument in a liquid expansion system?

When a bimetallic thermometer is heated, curling occurs to the metal side with the least temperature coefficients.

Ratio of the net amount of heat received and stored in the body for a specific time interval is known as

In a steel bulb thermometer, which liquid can be used for measuring temperature up to 6000⁰C?