Thermal diffusivity of a refractory brick is high, when its _________

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thermal conductivity

3. Emf developed by a thermocouple, while measuring a temperature of 600�C is about 5.5 mV. The type of thermocouple used is
Options
A. chromel-alumel
B. iron-constantan
C. platinum-platinum+rhodium
D. either (a), (b) or (c)

4. In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
Options
A. uranium oxide
B. uranium hexaflouride
C. uranium carbide
D. uranium sulphate

5. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
Options
A. compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
B. maintaining vacuum on tube side is more difficult than that on the shell side.
C. water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
D. condenser can act as a storage unit for condensed steam.

7. Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the
Options
A. nature of the liquid.
B. nature of the gas.
C. temperature of the liquid. id) total pressure.

9. Pick out the wrong statement.
Options
A. To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg.
B. 1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25.
C. A gas bubble at a pressure of P_g is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to P_s/P_g.
D. A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C₁. The output rate of solids from an efficient crystalliser is (C + C₁) V.

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