Engineering Materials - Study Mode

[#316] Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio
Correct Answer

(C) 70 : 30

Explanation

Solution: The correct answer is Option C: 70 : 30 . Let's break down why: Admiralty brass is a specific type of brass alloy . Brass is primarily made of copper and zinc . Admiralty brass has a typical composition of approximately 70% copper and 30% zinc , and also contains a small amount of tin (around 1%) to improve corrosion resistance, especially in seawater applications like steam condensers. Therefore, the ratio of copper to zinc in admiralty brass is closest to 70:30 . The other options are incorrect because they do not reflect the standard composition of admiralty brass.

[#317] Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio
Correct Answer

(A) 50 : 20 : 20 : 10

Explanation

Solution: The composition of alnico alloys is typically 50% of Iron, 20% of nickel,20% of aluminium and 10% of cobalt

[#318] Heavy duty leaf and coil springs contain carbon of the following order
Correct Answer

(D) 1.0%

Explanation

Solution: Heavy duty leaf and coil springs contain 1.0% carbon

[#319] Cold rolled steel sheets contain carbon of the following order
Correct Answer

(A) 0.1%

Explanation

Solution: Cold rolled steel sheets contains 0.1% carbon Cold Rolled Steel A rolling process at temperatures that are close to normal room temperature are used to create cold rolled steel. This increases the strength of the finished product through the use of strain hardening by as much as 20 %

[#320] In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled
Correct Answer

(B) Slowly in the furnace

Explanation

Solution: In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled Slowly in the furnace