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ENGINEERING MATERIALS INTERVIEW QUESITONS

Question 1: What is Insulation resistance?

Answer: Insulation resistance is the property, by the virtue of which, a material resists flow of electrical current. It should be high as possible

Question 2: * Describe the physical properties and uses Soft and hard magnetic materials.

Answer: Soft magnetic materials –They have small enclosed area of hysteresis loop, high permeability, high saturation value, low eddy current losses which is achieved by using laminated cores, less residual magnetism. Soft magnetic materials retain their magnetism as long as they are energised by an external magnetic field; Example: Alpha iron, super permalloy (Ni-Fe-Mo), silicon ferrite. Soft magnetic materials are used for the construction of cores for electrical machines, transformers, electromagnets reactors and cores of audio frequency couplings and matching transformers in telecommunication.


 Question 3: * What is called The ability of a material to absorb energy in the plastic range

Answer:  The ability of a material to absorb energy in the plastic range is called as resilience

Question 4: * Tell me about Butyl rubber.


Answer: Butyl rubber properties are excellent resistance to vegetable oils and alcoholic solvents, but it is easily attacked by petroleum oils and greases. It has high resistance to ozone, high thermal and oxidation stability but poor tensile strength. It is used as insulation for wires and cables.


Question 5: * Closed packed hexagonal space lattice is found in What?

Answer: losed packed hexagonal space lattice is found in zinc, magnesium, cobalt, cadmium, antimony and bismuth

Question 6: * Tell me about PVC and It's Application.

Answer:  PVC is obtained from polymerisation of vinyl chloride in the presence of a catalyst like peroxides at about 500 C. The properties like mechanical strength, porosity, flexibility, moisture absorption and electrical properties can be changed by adding certain materials. PVC has good mechanical and electrical properties. It is hard and brittle. It resists flame, most solvents and sunlight. It is non-hygroscopic. PVC is widely used as insulation and jacketing material for wires, cables. PVC films, tapes and sheets are used as insulation for dry batteries and conduit pipes. .

Question 7: * Tell me about  Low resistivity materials.

Answer: Low resistivity materials is the conducting materials having resistivity between 10-8 to 10-6 ohm-m come under this category and are used in transmission and distribution lines, transformers and motor windings.


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