Addition of ______________ to the steel helps in increasing the residual magnetism in steel used for making magnets?
Correct answer: D. Cobalt
- A. Chromium
- B. Nickel
- C. Tungsten
- D. Cobalt
Explanation
Cobalt increases the coercivity and residual magnetism of steel, making cobalt steels suitable for permanent magnets. Chromium, nickel and tungsten may modify hardness or toughness but are not the standard answer for maximum residual magnetism here.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Plant Design and Economics
803 free Plant Design and Economics MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Plant Design and Economics questions
Caustic soda can be stored in _____________ drums?
Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
The temperature at which new grains are formed in the metal is called the ______________ temperature?
The material of construction of pressure mills used for squeezing out the juice from sugar cane is__________________?
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and_________________?
Galvanised iron is___________________?