Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the_______________?

Related Mcqs:

1. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?

   A. 80 and 20 B. 20 and 80 C. 50 and 50 D. 60 and 40...

2. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?

   A. Fireclay B. Silicon carbide C. Corundum D. Siliceous fireclay...

3. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?

   A. 450 B. 250 C. 150 D. 65...

4. Cermets are____________________?

   A. Composite material containing both ceramic & metallic constituents B. Having high strength & resistance to high temperature C. Used in space vehicles, missiles & nuclear energy plants D. All A., B. and C....

5. Ferromagnetic ceramic material is not used in the__________________?

   A. Thermal insulation B. Transformers C. Magnetic switches D. Television sets...

6. ___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?

   A. Porosity B. RUL C. Specific gravity D. Thermal conductivity...

7. Silica bricks have low spalling resistance below 600°C, due to its________________?

   A. Very high thermal conductivity B. High co-efficient of expansion upto this temperature C. High thermal diffusivity D. Low refractoriness...

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

   A. 700 B. 1000 C. 1600 D. 2000...

9. Maximum alumina content in high alumina refractory can be as high as _____________ percent?

   A. 30 B. 50 C. 70 D. 90...

10. Thermal diffusivity of a refractory brick is high, when its ____________ is high?

    A. Density B. Specific heat C. Thermal conductivity D. None of these...