0

Aerospace Materials Mcqs

Q:

The density of Zinc is ____________ at room temperature.

A) 2.7 gram per cubic centimetre B) 6.52 gram per cubic centimetre
C) 7.14 gram per cubic centimetre D) 0.44 gram per cubic centimetre
 
Answer & Explanation Answer: C) 7.14 gram per cubic centimetre

Explanation: The density of the element zinc is 7.14 gram per cubic centimetre. 2.7 gram per cubic centimetre is the density of aluminium. 6.52 gram per cubic centimetre is the density of the element zirconium.

View Answer Discuss

86
Q:

The atomic number of zinc is ___________

A) 25 B) 13
C) 104 D) 30
 
Answer & Explanation Answer: D) 30

Explanation: The atomic number of zinc is 30. 25 is the atomic number of the element manganese. 13 is the atomic number of aluminium. Rutherfordium is the synthetic chemical element with an atomic number of 104.

View Answer Discuss

54
Q:

Inconel welds are cleaned after fabrication by submerging in a _________ cold nitric acid solution.

A) 20% B) 50%
C) 99% D) 12%
 
Answer & Explanation Answer: B) 50%

Explanation: Inconel welds are corrosion resistant. They are even more corrosion resistant when compared to the original material. Inconel welds are cleaned after fabrication by submerging in a 50% cold nitric acid solution.

View Answer Discuss

56
Q:

K Monel is accessible as ___________

A) Forgings B) Z-shape
C) U-shape D) T-shape
 
Answer & Explanation Answer: A) Forgings

Explanation: K Monel is commercially accessible in several forms and shapes. Some of the forms in which the alloy is accessible are Forgings, strip, wire, etc. Forged material can be used in manufacturing aircraft.

View Answer Discuss

53
Q:

____________ is formed on the surface of Inconel if heated above 700°F in an oxidizing atmosphere.

A) Carbon B) Chromium oxide
C) Hydrogen peroxide D) Nitric oxide
 
Answer & Explanation Answer: B) Chromium oxide

Explanation: Chromium oxide is formed on the surface of the nickel-chromium based alloy when it is heated above 700°F in an oxidizing atmosphere. There are different methods like pickling to remove it.

View Answer Discuss

65
Q:

K Monel sheet can be welded satisfactorily by ___________

A) oxyacetylene B) cold-rolling
C) anomaxicity D) cold-rolling and Anomaxicity
 
Answer & Explanation Answer: A) oxyacetylene

Explanation: K Monel sheet can be welded satisfactorily by Oxyacetylene. There are different methods of making the flux required for this. The weld that is obtained as a by-product in this reacts to heat treatment.

View Answer Discuss

54
Q:

____________ can be used as a lubricant when Monel is subjected to boring, drilling, etc.

A) Carbon oil B) Sulphurized oil
C) Vegetable oil D) Deep oil
 
Answer & Explanation Answer: B) Sulphurized oil

Explanation: Sulphurized oil can be used as a lubricant and should be used extensively when Monel is being subjected to machine work activities like boring, drilling, etc. For some activities, other oils are enough.

View Answer Discuss

43
Q:

Inconel springs can be used at temperatures between ___________

A) 600-700°C B) 100-200°F
C) 50-150°F D) 600-700°F
 
Answer & Explanation Answer: D) 600-700°F

Explanation: Inconel springs can be used at temperatures between 600-700°F. Inconel is also suitable for usage due to its various advantageous properties like being corrosion resistant and its non-magnetic nature.

View Answer Discuss

52