Related Questions

Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
A Cermet
B Glass
C Thermosetting plastic
D Metallic alloy
As compared to shallow wells, deep wells have
A More depth
B Less depth
C More discharge
D Less discharge
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
A Copper
B Steel
C Aluminium
D Brass
Thermal wells used in temperature measurements should have
A Very thick walls
B Low emissivity
C Polished surface
D High transmissivity of radiation
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
Thermal expansion of solid is employed in the temperature measurement by a
A Bimetallic thermometer
B Thermocouple
C Mercury thermometer
D Resistance thermometer
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.
A Hyperbolic
B Parabolic
C Linear
D Logarithmic
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
A Decreases
B Increases
C Remains unchanged
D Increases exponentially
Which of the following pump is successfully used for lifting water from deep wells?
A Centrifugal pump
B Reciprocating pump
C Jet pump
D Air lift pump
A common disinfectant used in village wells for disinfection of water is
A Free chlorine
B Bromine
C Iodine
D Potassium permanganate

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