Related Questions

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
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
Small daily and seasonal range of temperature, comparatively cool summer and comparatively warm winter. This would be the characteristic climate of ________
A An island
B A tropical country
C The interior of a continent
D Temperate latitudes
With increase in temperature, the thermal conductivity of most liquids
A Increases
B Decreases
C Remains same
D First increases upto a certain temperature and then becomes constant
When two products are simultaneously produced in a process and one of them has comparatively high value and other is of low value , the low value product is called __________.
A joint products
B by products
C seasonal products
D economic products
If water table is comparatively high, the irrigation canal becomes useless, due to
A Large amount of seepage
B Water logging of the cultivated areas
C Uncertain water demand
D All the above
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$
Low thermal conductivity of heat insulating materials is due to its
A Dense structure
B High proportion of air space
C High specific heat
D None of these
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
A L.D. converter
B Blast furnace
C Rotary kiln
D Recuperator

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