Composite Materials Quiz – Insight into Chemical Engineering

CM Quiz – 1

Q 1: Ceramic is

A) an organic and non-metallic solid material

B) an organic and metallic solid material

C) an inorganic and non-metallic solid material

D) an inorganic and metallic solid material

Answer is C)

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?

A) Non-crystalline

B) Crystalline

C) Both phases

D) None is true

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.

Usually, non-crystalline phases dissolve first.

Q 3: Which of the following is referred to as a green body during ceramic processing?

A) Ceramic Powder

B) Consolidated powder before sintering

C) Consolidated powder after sintering

D) Green colored ceramic product

Answer is B)

Explanation: Consolidated powder before sintering is referred as green body.

Q 4: What is the driving factor behind sintering?

A) densification

B) enhancement in the free surface energy

C) reduction in the free surface energy

D) high porosity

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?

A) S stands for high silica

B) it can withstand higher temperature

C) it is known for its mechanical properties

D) All of above

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

A) extremely fine fibers

B) thick fibers

C) non-crystalline material

D) A and C

E) B and C

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?

A) different parts of the green body shrink at different rates

B) different parts of the green body shrink at same rates

C) densification of the green body at same rate

D) density of green body becomes uniform

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

A) Ball mill

B) Jet mill

C) Vibration mill

D) Agitated mill

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

A) Clay is hydrophilic in nature

B) pretreatment of clay is required for hydrophilic polymers

C) pretreatment of clay is not required for hydrophilic polymers

D) pretreatment of clay is required for hydrophobic polymers

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?

A) ARALL

B) CARE

C) TIGR

D) GLARE

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.

CM Quiz – 1

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