In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?

Related Mcqs:

1. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively ?

   A. 2
   B. 8
   C. 10
   D. 40

2. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of__________________?

   A. 1 : 1
   B. 1 : 2
   C. 2 : 1
   D. 1 : 4

3. Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?

   A. Invar
   B. Hastelloy
   C. Duralumin
   D. Monel metal

4. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ?

   A. Steel
   B. Glass
   C. Rubber
   D. Brass

5. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young’s modulus, G = Modulus of rigidity or shear modulus v = Poisson’s ratio) ?

   A. E = 2G (1 + v)
   B. E = G (1 + v)
   C. E = G (1 + v)/2
   D. E = 2G (1 + 2v)

6. A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is_________________?

   A. Lead
   B. Glass
   C. Mica
   D. Silver

7. The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the _____________ point of the material?

   A. Elastic
   B. Ultimate
   C. Yielding
   D. Breaking

8. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron ?

   A. 159
   B. 1837
   C. 2537
   D. 10000

9. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) ?

   A. T
   B. 1/T
   C. T2
   D. 1/T2

10. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?

    A. Nitrogen oxides
    B. Hydrocarbons
    C. Both A. & B.
    D. Carbon monoxide