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Q: The invar tape is made of _____.
  • A. Alloy of carbon and steel
  • B. Alloy of zinc and steel
  • C. Alloy of nickel and steel
  • D. Alloy of aluminum and steel
Correct Answer: Option C - Invar tape– Invar is a 36% nickel and 64% steel alloy which has the lowest thermal expansion among all metals and alloys in the range from room temperature up to approximately 2300C. It is 6 mm wide and is available in lengths of 30 m, 50 m and 100 m. • It is costly and delicate and should be handled with great care. It is highly precise and less effected by temperature changes. • It is having the lowest coefficient of thermal expansion recommended for applications requiring no dimensional changes with temperature variations. • Invar tapes are used mainly for linear measurements of a very high degree of precision such as measurement of base line.
C. Invar tape– Invar is a 36% nickel and 64% steel alloy which has the lowest thermal expansion among all metals and alloys in the range from room temperature up to approximately 2300C. It is 6 mm wide and is available in lengths of 30 m, 50 m and 100 m. • It is costly and delicate and should be handled with great care. It is highly precise and less effected by temperature changes. • It is having the lowest coefficient of thermal expansion recommended for applications requiring no dimensional changes with temperature variations. • Invar tapes are used mainly for linear measurements of a very high degree of precision such as measurement of base line.

Explanations:

Invar tape– Invar is a 36% nickel and 64% steel alloy which has the lowest thermal expansion among all metals and alloys in the range from room temperature up to approximately 2300C. It is 6 mm wide and is available in lengths of 30 m, 50 m and 100 m. • It is costly and delicate and should be handled with great care. It is highly precise and less effected by temperature changes. • It is having the lowest coefficient of thermal expansion recommended for applications requiring no dimensional changes with temperature variations. • Invar tapes are used mainly for linear measurements of a very high degree of precision such as measurement of base line.