Description : Tick off the material, which is different from the group (A) Constantan. (B) Manganin. (C) Nichrome. (D) Brass.
Last Answer : (D) Brass.
Description : Property of material which allows it to be drawn out into wires is (A) Ductility. (B) Solder ability. (C) Super conductivity. (D) Malleability.
Last Answer : (A) Ductility.
Description : Manganese in steel affects its (A) Ductility (B) Tensile strength (C) Hardness (D) None of these
Last Answer : (B) Tensile strength
Description : With increase in the carbon percentage in the steel, its (A) Hardness increases (B) Ductility reduces (C) Tensile strength increases (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Distortion or change in shape of a cast partial denture clasp during its clinical use probably indicates that the: A. Ductility was too low B. Hardness was too great C. Ultimate tensile strength was too low D. Tension temperature was too high E. Elastic limit was exceeded
Last Answer : E. Elastic limit was exceeded
Description : Define the term: i)Tensile strength ii) Hardness iii) Ductility iv) Soldering
Last Answer : i)Tensile Strength : Tensile Strength is the ability of metal to carry a load without breaking. ii)Hardness :- Hardness is the ability of metal to resist wear or abrasion and resist penetration. ... a non ferrous alloy having melting point below 4000 c in between them is called as soldering.
Description : Example of high resistivity material is (A) Nichrome (B) Silver (C) Gold (D) Copper
Last Answer : (A) Nichrome
Description : The most malleable, ductile low resistivity material is (A) Copper. (B) Aluminium. (C) Silver. (D) Iron.
Last Answer : (C) Silver.
Description : Resistivity of conductors is most affected by (A) composition. (B) temperature. (C) pressure. (D) current.
Last Answer : (B) temperature.
Description : The material with lowest resistivity is (A) constantan. (B) silver. (C) manganin. (D) nichrome.
Last Answer : (B) silver.
Description : Gold and silver are (A) dielectric materials (B) low resistivity conducting materials. (C) magnetic materials. (D) insulating materials.
Last Answer : (B) low resistivity conducting materials.
Description : The property due to which a metal can be hammered into thin sheets without breaking is _______. a) malleability b)ductility c)tensile strength d)conductivity
Last Answer : a) malleability
Description : The dielectric strength of transformer oil should be (A) 100 V. (B) 5 KV. (C) 30 KV. (D) 132 KV.
Last Answer : (C) 30 KV.
Description : The critical temperature above which the ferromagnetic materials loose their magnetic property is known as (A) hysterisis. (B) Curie point. (C) transition temperature. (D) standard temperature.
Last Answer : (B) Curie point
Description : The property due to which the resistance of some metal or compound vanishes under certain conditions is (A) Semi conductivity. (B) Super conductivity. (C) Curie point. (D) Magnetostriction.
Last Answer : (B) Super conductivity.
Description : Addition of nickel to copper improves its (A) Machinability (B) Ductility (C) Strength (D) Hardness
Last Answer : (D) Hardness
Description : In cold working of metal as compared to its hot working (A) Cracks and blow holes are eliminated (B) Ductility and impact strength improves (C) Appreciable strain hardening is produced (D) Yield stress, hardness and fatigue strength is not at all affected
Last Answer : (C) Appreciable strain hardening is produced
Description : Define ductility; plasticity; hardness strength.
Last Answer : Definition: 1) Ductility Ductility is the ability of a material to be deformed plastically without fracture under tensile strength. Ductility is the property of material by which materials can be ... or cutting. The ability of a material to resist wear or abrasion and resist penetration.
Description : The most distinguished property of malleable cast iron is its high (A) Ductility (B) Hardness (C) Malleability (D) None of these
Last Answer : (A) Ductility
Description : The graphite in grey irons exists in the form of flakes which act as stress-raisers under tensile loading and consequently grey irons have relatively low tensile strength and ductility. Still grey iron is extensively used in engineering. Why ?
Last Answer : (a) Cheapness. (B) Low melting point and high fluidity making it suitable for castings of intricate shape. (c) Relatively good erosion and corrosion resistance. (d) High damping capacity, with respect to vibration. (e) Relatively good mechanical properties under compressive loading.
Description : Cast iron has (A) Very high tensile strength (B) High ductility (C) High malleability (D) Elastic limit close to ultimate breaking strength
Last Answer : (D) Elastic limit close to ultimate breaking strength
Description : Copper has very low (A) Malleability (B) Ductility (C) Tensile strength (D) Thermal & electrical conductivity
Last Answer : (C) Tensile strength
Description : When the steel is subjected to normalising, its __________ decreases. (A) Yield point (B) Ductility (C) Ultimate tensile strength (UTS)
Last Answer : (B) Ductility
Description : Work hardening of a material (A) Decreases its tensile strength (B) Decreases its ductility (C) Increases its ductility (D) Does not affect its ductility
Last Answer : (B) Decreases its ductility
Description : Cast iron has (A) High ductility (B) High malleability (C) Very high tensile strength (D) Its elastic limit very close to ultimate breaking strength
Last Answer : (D) Its elastic limit very close to ultimate breaking strength
Description : Cast iron is having very high (A) Proximity between its elastic limit and ultimate breaking strength (B) Ductility (C) Tensile strength (D) All (A), (B) and (C)
Last Answer : (A) Proximity between its elastic limit and ultimate breaking strength
Description : High carbon content in the steel causes (A) Decrease in tensile strength but increase in ductility (B) Increase in tensile strength but decrease in ductility (C) Decrease in both tensile strength and ductility (D) Increase in both tensile strength and ductility
Last Answer : Answer: Option B
Description : The percentage elongation and the percentage reduction in area depends upon (a) Tensile strength of the material (b) Ductility of the material (c) Toughness of the material (d) None of these
Last Answer : B
Description : Which of the following physical properties is TRUE of most dense ceramic materials? w) high tensile strength x) good ductility y) high compressive strength z) high electrical conductivity
Last Answer : ANSWER: Y -- HIGH COMPRESSIVE STRENGTH
Description : The property of a material by which it can be drawn to a smaller section by applying a tensile load is called (a) Elasticity (b) Plasticity (c) Ductility (d) Malleabilityy
Last Answer : (c) Ductility
Description : Fire refining process is employed in case of (A) Tin (B) Copper (C) Zinc (D) Aluminium
Last Answer : (B) Copper
Description : The following type of bonding is strongly directional in solids. (A) Vander Waal's (B) Ionic (C) Metallic (D) Covalent
Last Answer : D) Covalent
Description : What is a modular system? List the important properties of a modular system.
Last Answer : Ans: A modular system consists of well defined manageable units to well defined interfaces among them. Desirable properties are Each module is a well defined subsystem useful to others Each module ... modules Modules should be easier to use than build Modules should have a simple interface
Description : State the functions of a fuse. Mention the desirable properties of fuse materials.
Last Answer : Ans: Fuse is a protective device, which consists of a thin wire or strip. This wire or strip is placed with the circuit it has to protect, so that the circuit-current flows through it. When ... silver and silver alloys are used of lower ratings. Copper alloys are used in fuses of higher ratings.
Description : Give four examples of natural insulating materials.
Last Answer : Ans: Examples of the natural insulating materials are cotton, rubber, wood, mica.
Description : Classify plastic materials into two categories, describe their important properties and give two examples of each.
Last Answer : Ans: Plastic materials can be classified into thermoplastic and thermosetting plastics. Thermoplastic materials:- The properties of these plastic materials do not change considerably if they are melted ... forming elastic threads and films. Examples are Phenol formaldehyde (Bakelite), Epoxy resins.
Description : Ferroelectric materials are characterised by (A) Very high degree of polarisation. (B) A sharp dependence of polarisation on temperature. (C) Non-linear dependence of the charge Q on the applied voltage. (D) All the above.
Last Answer : (D) All the above.
Description : Semi-conductors have ________ temperature coefficient of resistance. (A) Negative (B) Positive (C) Both positive and negative (D) None of the above
Last Answer : (A) Negative
Description : Atoms with four valence electrons are good conductors. (A) True (B) False
Last Answer : (B) False
Description : Hysteresis loss least depends on (A) Frequency. (B) Magnetic field intensity. (C) Volume of the material. (D) Grain orientation of material.
Last Answer : (D) Grain orientation of material.
Description : Insulators have (A) A full valence band. (B) An empty conduction band. (C) A large energy gap. (D) All the above.
Last Answer : (C) A large energy gap.
Description : Paper is hygroscopic and absorbent. (A) True (B) False
Last Answer : (A) True
Description : In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it. (A) Increased (B) Decreased (C) Remains unchanged (D) Becomes zero
Last Answer : (C) Remains unchanged
Description : Magnetic materials (A) provide path to magnetic flux. (B) are good insulators. (C) are semiconductors. (D) None.
Last Answer : (A) provide path to magnetic flux.
Description : Addition of trivalent impurity to a semiconductor creates many (A) holes. (B) free electrons. (C) valance electrons. (D) bound electrons.
Last Answer : (B) free electrons.
Description : Hall effect is associated with (A) Conductors. (B) Semiconductors. (C) Thermistors. (D) Solders.
Last Answer : (B) Semiconductors.
Description : Hard magnetic materials are used for making (A) Permanent magnets. (B) Temporary magnets. (C) Conductors. (D) Insulator.
Last Answer : (A) Permanent magnets.
Description : A transistor has (A) One p-n junction. (B) Two p-n junction. (C) Four p-n junction. (D) Five p-n junction.
Last Answer : (B) Two p-n junction.
Description : Bronze is an alloy of (A) Copper and Tin. (B) Copper and Steel. (C) Copper and Mercury. (D) Copper and Aluminium.
Last Answer : (A) Copper and Tin.
Description : Which of the following material has the highest melting point (A) Copper. (B) Aluminium. (C) Tungsten. (D) Gold.
Last Answer : (C) Tungsten.