In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _____________ °C for 24 hours?

Related Mcqs:

1. With increase in the porosity, thermal spalling resistance of fireclay brick_______________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease

2. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?

   A. 770
   B. 570
   C. 270
   D. 70

3. Panel test determines the ______________ of refractories?

   A. Fusion point
   B. Spalling resistance
   C. Slag penetration resistance
   D. Refractoriness under load (RUL)

4. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is_________________?

   A. 1/2
   B. 1/3
   C. 1/4
   D. 2/3

5. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases?

   A. Potential energy
   B. Intermolecular forces
   C. Kinetic energy
   D. Total energy

6. The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen?

   A. Lower than
   B. Higher than
   C. Same as
   D. Not related to

7. At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Increases linearly

8. For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?

   A. Sodium chloride
   B. Sodium carbonate monohydrate
   C. Anhydrous sodium sulphate
   D. Hypo

9. The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is___________________?

   A. Doubled
   B. Halved
   C. Trebled
   D. Unpredictable

10. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

    A. 380
    B. 630
    C. 760
    D. 880