Explanation: Ceramics is neither organic nor metallic. Ceramics is an inorganic and non-metallic solid material.
Q 2: In hydrofluoric acid, which phase of the ceramic dissolves first?
Answer is A)
Explanation: Ceramics have good chemical resistance to weak acids and weak bases. However, they are soluble in certain strong acids (Hydrofluoric acid) and strong bases.
Q 3: Which of the following is referred to as a green body during ceramic processing?
Answer is B)
Explanation: Consolidated powder before sintering is referred as green body.
Q 4: What is the driving factor behind sintering?
Answer is C)
Explanation: Sintering is the process of consolidation and densification of granular compact by the action of heat and pressure without melting it. It is accompanied by a lowering of the free surface energy of the system.
Q 5: Which of the following statements concerning S-glass is correct?
Answer is D)
Explanation: Glass fibers can be of several types depending on the composition, such as E-glass, C-glass, G-glass, S-glass, and so on. In S-glass, the designation S stands for high silica. It can withstand higher temperatures. It is known for its mechanical properties.
Q 6: Glass fibers consist of
Answer is D)
Explanation: It is a material consisting of extremely fine fibers of glass which is a non-crystalline material.
Q 7: What happens during differential sintering?
Answer is A)
Explanation: Agglomerates cause heterogeneous packing in the green body, which results in differential sintering during the firing process. During differential sintering, different parts of the green body shrink at different rates.
Q 8: In which mill, grinding media is not used
Answer is B)
Explanation: In a jet mill, a high-speed gas is used to impact coarse particles into each other.
Q 9: Pick the incorrect statement about clay
Answer is B)
Explanation: The clays are naturally hydrophilic. As a result, clay pretreatment is not necessary for hydrophilic polymers.
Q 10: Which hybrid composite is used commercially for the aircraft’s upper fuselage section?
Answer is D)
Explanation: GLARE is used commercially for the aircraft’s upper fuselage section because of its superior properties over CARE, TIGR, and ARALL.
