2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit…MCQs preparation for Engineering Competitive Exams Home Engineering Multiple Choice Questions and Answers Engineering Interview Questions and Answers AIPMT Question Bank 2015 Get AIPMT Question Bank To Revise Weakest Concepts From All Chapters. Home » Electrical Engineering Materials Quiz Questions and Answers » 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers Wednesday, 3 September 2014 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers Latest Electrical Engineering Materials Questions and Answers 1. The converse of hardness is known as (a) malleability (b) toughness (c) softness (d) none of the above Ans: c 2. On which of the following factors does the resistivity of a material depend ? (a) Resistance of the conductor (b) Area of the conductor section (c) Length of the conductor (d) All of the above Ans: d 3. is a negatively charged particle present in an atom. (a) Proton (b) Neutron (c) Electron (d) None of the above Ans: c 4. The formula ____ determines the number of electrons that can be accommodated in any level. (a) 2n2 (6) 4n2 (c) 2n3 (d) 4ns Ans: a 5. The tiny block formed by the arrangement of a small group of atoms is called the (a) unit cell (b) space lattice (c) either (a) or (b) (d) none of the above Ans: a 6. The coordination number of a simple cubic structure is (a) 2 (b) 4 (c) 6 (d) 8 Ans: c 7. The covalent bond is formed by (a) transfer of electrons between atoms (b) sharing of electrons between atoms (e) sharing of variable number of electrons by a variable number of atoms (d) none of the above Ans: b 8. A perfect conductor has http://engineeringmcqs.blogspot.in/2014/09/100topelectricalengineering.html Search Here Labels A.C. 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The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal Ans: a Electrical Cables Quiz Questio Answers 10.2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… (a) zero conductivity (b) unity conductivity (c) infinite conductivity (d) none of the above Ans: c Docks and Harbor Engineerin Questions and Answers 9. The kinetic energy of a bounded electron is (a) less than that of unbounded electron (6) greater than that of unbounded electron (c) equal to that of unbounded electron (d) infinite (e) none of the above Ans: a 13. The superconductivity is due to (a) the crystal structure having no atomic vibration at 0°K (b) all electrons interact in the superconducting state (c) the electrons jump into nucleus at 0°K (d) none of the above Ans: a 17.in/2014/09/100topelectricalengineering. A highly conductive material must have (a) highest conductivity (b) lowest temperature coefficient (c) good mechanical strength (d) good corrosion resistance (e) easy solderable and drawable quality (f) all of the above Ans: f 14. Commonly used conducting materials are (a) copper (b) aluminium (c) both (a) and (b) (d) copper and silver (e) platinum and gold Ans: c 11. The conductivity of a conductor can be increased by (a) decreasing its temperature (b) increasing its temperature (c) decreasing its vibration (d) increasing its vibration Ans: a 15.C. and low frequency (c) a. The value of critical field below the transition temperature will (a) increase (b) decrease (c) remain unchanged (d) any of the above Ans: a 18. and high frequency (d) frequencies having no effect (e) none of the above Ans: b 16. 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Superconductivity is observed for (a) infrared frequencies (b) d.blogspot. Which of the following materials is preferred for transmitting electrical energy over long distance ? (a) Copper (b) Aluminium (c) Steel reinforced copper (d) Steel reinforced aluminium Ans: d 12. 2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… 19.14'K Ans: c 27. The coils of D. At transition temperature the value of critical field is (a) zero (6) negative real value (c) positive real value (d) complex value Ans: a 30.C. The structure sensitive property of a super conductor is (a) critical magnetic field (b) transition temperature (c) critical current density (d) none of the above Ans: c 29.12°K (d) 1. An H.in/2014/09/100topelectricalengineering.html 3/10 . motor starter are wound with wire of (a) copper (b) kanthal (c) manganin (d) nichrome Ans: c 25. Which of the following resistive materials has the lowest temperature coefficient of resistance ? (a) Nichrome (b) Constantan (c) Kanthal (d) Molybdenum Ans: a 24. fuse is (a) a ceramic body having metal and caps (b) a wire of platinum (c) a heavy crosssection of copper or aluminium (d) a ceramic tube having carbon rod inside it Ans: a Strength of Materials Objecti Questions and Answers Strength of Materials Questio Answers Structural Analysis Objective and Answers Switchgear Protections Quiz and Answers Synchronous Motors Quiz Qu Answers Theory of Machines Objective Questions and Answers Thermodynamics Objective T Questions and Answers TOP Civil Engineering Multipl Questions and Answers Transformers Quiz Questions Answers Transmission and Distributio Questions and Answers Tunnel Engineering Objective Questions and Answers Water Resources and Irrigati Engineering 23.C. The conductors have transport phenomena of electrons due to (a) electric field (b) magnetic field (c) electromagnetic field (d) none of the above Ans: a 26. The transition temperature of mercury is (a) 18. Which of the following variety of copper has the best conductivity ? (a) Induction hardened copper (b) Hard drawn copper http://engineeringmcqs. High resistivity materials are used in (a) precision instruments (6) heating elements (c) motor starters (d) incandescent lamps (e) all of the above Ans: e Surveying Problems Quiz que 21.R. Superconductors are becoming popular for use in (a) generating very strong magnetic field (b) manufacture of bubble memories (c) generating electrostatic field (d) generating regions free from magnetic field Ans: a Steam Boilers 20.22°K (c) 4. Mercury as an electric contact material is (a) a liquid (b) a metal (c) a metal liquid (d) a gas Ans: c 22.blogspot. By increasing impurity content in the metal alloy the residual resistivity always (a) decreases (b) increases (c) remains constant (d) becomes temperature independent Ans: b 28.0°K (6) 9. Constantan contains (a) silver and tin (b) copper and tungsten (c) tungsten and silver (d) copper and nickel Ans: d 32. (a) resonant waves (b) musical waves (c) microwaves (d) ultrasonic waves Ans: d 35. (a) Aluminium (b) Carbon (c) Porcelain (d) Manganin Ans: d 34. Overhead telephone wires are made of (a) aluminium (b) steel (c) ACSR conductors (d) copper Ans: b 41. (a) Castiron (6) Graphite (c) Rubber (d) Glass Ans: c 37. copper and lead Ans: b 39 ______ is most commonly used for making magnetic recording tape (a) Silver nitrate (b) Ferric oxide (c) Small particles of iron (d) Siliconiron Ans: b 40.blogspot.2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… (c) Pure annealed copper (d) Copper containing traces of silicon Ans: c 31. Solder is an alloy of (a) copper and aluminium (b) tin and lead (c) nickel. (a) Glass (b) Quartz (c) Corrundum (d) Neoprene Ans: b http://engineeringmcqs.in/2014/09/100topelectricalengineering. copper and zinc (d) silver. Which of the following is the poorest conductor of electricity ? (a) Carbon (b) Steel (c) Silver (d) Aluminium Ans: a 33 ______ has zero temperature coefficient of resistance.html 4/10 . Carbon electrodes are not used in (a) GLS lamps (b) electric arc furnace (c) dry cells (d) cinema projectors Ans: a 38. ______ is an example of piezoelectric material. Piezoelectric materials serve as a source of _____ . In thermocouples which of the following pairs is commonly used ? (a) Copperconstantan (b) Aluminiumtin (c) SilverGerman silver (d) Ironsteel Ans: a 36 is viscoelastic. Which of the following materials does not have covalent bonds ? (a) Organic polymers (b) Silicon (c) Metals Ans: c 53. Which of the following affect greatly the resistivity of electrical conductors ? (a) Composition (b) Pressure (c) Size (d) Temperature Ans: a 46. _____ is the main constituent of glass (a) Fe203 (b) Si02 (c) AI2O3 (d) B2O3 Ans: b 43. A good electric contact material should have all of the following properties except (a) high resistivity (b) high resistance to corrosion (c) good thermal conductivity (d) high melting point Ans: a 44. (a) linear (b) hexagonal (c) orthorhombic (d) cubic Ans: d 45. (a) Tinlead (6) Tinsilverlead (c) Copperzinc (d) None of the above Ans: c 48. Super conductivity can be destroyed by (a) adding impurities (b) reducing temperatures (c) application of magnetic field (d) any of the above Ans: c 50.3 to 4. _____ is a hard solder. Ans: d 52. A carbon resistor contains (a) carbon crystals (b) solid carbon granules (c) pulverized coal (d) finely divided carbon black. Nonlinear resistors (a) produce harmonic distortion (b) follows Ohm's law at low temperatures only (c) result in nonuniform heating (d) none of the above Ans: a 51. Most of the common metals have _____ structure.blogspot. bonding is (a) covalent (b) metallic (c) Vander Waals (d) Vander Waals and covalent Ans: d http://engineeringmcqs.5% silicon to iron _____ the electrical resistivity of iron. In graphite. Thermonic emission occurs in (a) vacuum tubes (b) copper conductors (c) ferrite cores (d) transistors Ans: a 47.2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… 42.in/2014/09/100topelectricalengineering. (a) increases (b) decreases (c) does not change Ans: a 49.html 5/10 . Addition of 0. The conductivity of a metal is determined by (a) the electronic concentration and the mobility of the free electrons (6) the number of valence electrons per atom (c) either (a) or (b) (d) none of the above Ans: a 57. Due to which of the following reasons aluminium does not corrode in atmosphere ? (a) Aluminium is a noble metal (b) Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium (c) No reaction with oxygen occurs ft Any of the above Ans: b 60. Which of the following are nonconductors of electricity? (a) Nonmetal solids except carbon (b) Air and most other gases (c) Pure water and liquids in general except mercury http://engineeringmcqs. Carbon rods are used in wet and dry cells because (a) carbon rod serves as conductor (b) carbon can resist the attack of battery acid (c) both (a) and (b) (d) either (a) or (b) Ans: c 64.html 6/10 .2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… 54. Due to which of the following factors the brush wear rate is altered ? (a) Speed of the machine (b) Contact pressure (c) Surface conditions of brush and commutator (d) Excessive sparking (e) All of the above Ans: e 65.C. In a crystal. The resistivity of a metal is a function of temperature because (a) the amplitude of vibration of the atoms varies with temperature (b) the electron density varies with temperature (c) the electron gas density varies with temperature Ans: a 58.blogspot. The number of atoms per unit cell in B.in/2014/09/100topelectricalengineering. an atom vibrates at a frequency determined by (a) the heat content of the crystal (b) the temperature of the crystal (c) the stiffness of the bonds it makes with neighbors Ans: c 59. Total number of crystal systems is (a) 2 (b) 4 (c) 7 (d) 12 Ans: c 55. Carbon resistors are used extensively because they are (a) easy to make (b) compact (c) inexpensive (d) all of the above reasons Ans: d 63. Which of the following material is not a semiconductor ? (a) Silica (b) Germanium (c) Selenium (d) Galliumarsenide Ans: a 62.C. structure is (a) 1 (b) 2 (c) 4 (d) 8 Ans: b 56. The impurity atoms is semiconductors (a) inject more charge carriers (6) reduce the energy gap (c) increase the kinetic energy of valence electrons (d) all of the above Ans: b 61. motor and generator windings (b) transmission and distribution lines (c) house wiring (d) all above applications Ans: d 70.html 7/10 . Low resistivity materials are used in (a) transformer. Which of the following is an advantage of stranded conductor over equivalent single conductor ? (a) Less liability to kink (b) Greater flexibility (c) Less liability to break (d) All of the above Ans: d 72. Platinum is used in (a) electrical contacts (b) thermocouple (c) heating element in high temperature furnace (d) grids of special purpose vacuum tubes (e) all of the above Ans: e 71. Substances whose specific resistance abruptly decreases at very low temperature are called (a) insulators (b) conductors (c) semiconductors (d) superconductors Ans: d 76. even though costly. Which of the following materials is the best conductor of electricity ? (a) Tungsten (b) Aluminium (c) Copper (d) Carbon Ans: c http://engineeringmcqs. Due to which of the following reasons copper and aluminium are not used for heating elements ? (a) Both have great tendency for oxidation (b) Both have low melting point (c) Very large length of wires will be required (d) All of the above Ans: d 73. Steel wire is used as (a) overhead telephone wire (b) earth wire (c) core wire of ACSR (d) all of the above Ans: d 69. Carbon bearings are used under which of the following conditions ? (a) Where lubrication is difficult or impossible (b) Where corrosive chemical action exists (c) Where high temperature exists (d) All of the above Ans: d 67. Which of the following high resistance materials has the highest operating temperature ? (a) Kanthal (b) Manganin (c) Nichrome (d) Eureka Ans: a 68. Copper.in/2014/09/100topelectricalengineering. Which of the following materials is used for making coils of standard resistances ? (a) Copper (b) Nichrome (c) Platinum (d) Manganin Ans: d 75.blogspot.2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… (d) All of the above Ans: d 66. finds use in the windings of electrical machines because (a) copper points offer low contact resistance (b) copper can be easily soldered and welded (e) copper windings are less bulky and the machines become compact (d) all of the above Ans: d 74. in India. cheaper and lighter than copper (c) Aluminium has lower resistivity than that of copper (d) Aluminium has less temperature coefficient than copper Ans: b 80. Which of the following factors affect resistivity of metals ? (a) Age hardening (b) Alloying (c) Temperature http://engineeringmcqs. Which of the following is a semiconductor material ? (a) Phosphorous (b) Rubber (c) Silicon (d) Aluminium Ans: c 82. If the resistance of a conductor does not vary in accordance with Ohm's law it is known as (a) nonlinear conductor (b) reverse conductor (c) badconductor (d) nonconductor Ans: a 86.html 8/10 .blogspot. The conduction of electricity. ________ has the best damping properties. (a) Diamond (b) High speed steel (c) Mild steel (d) Cast iron Ans: d 84. aluminium is replacing copper ? (a) Aluminium is more ductile and malleable than copper (6) Aluminium is available in plenty. in semiconductors. (a) extrnisic (b) intmisic (c) Ntype (d) Ptype Ans: b 83. Due to which of the following fact. Spark plug makes use of which of the following materials for insulation ? (a) Porcelain (b) Slate (c) Asbestos (d) Glass Ans: a 87. The forbidden gap in an insulator is (a) large (b) small (c) nil (d) any of the above Ans: a 88. The photoelectric effect occurs only when the incident light has more than a certain critical (a) intensity (b) speed (c) frequency (d) wave length Ans: c 85. Selenium is _____ semiconductor. is the property of absorbing moisture from atmosphere. takes place due to movement of (a) positive ions only (b) negative ions only (c) positive and negative ions (d) electrons and holes Ans: d 81.2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… 77.in/2014/09/100topelectricalengineering. Thermocouples are mainly used for the measurement of (a) temperature (b) resistance (c) eddy currents (d) coupling coefficient Ans: a 79. (a) Solubility (b) Viscosity (c) Porosity (d) Hygroscopicity Ans: d 78. (a) An acceptor (b) A donor (c) Germanium (d) Silicon Ans: a 99.html 9/10 . The minority carrier concentration is largely a function of (a) forward biasing voltage (b) reverse biasing voltage (c) temperature (d) the amount of doping Ans: c http://engineeringmcqs. Effect of moisture on the insulating materials is to (a) decrease dielectric constant (b) decrease dielectric strength (c) decrease insulation resistance (d) increase dielectric loss (e) all of the above Ans: e 90. Superconducting metal in super conducting state has relative permeability of (a) zero (b) one (c) negative (d) more than one Ans: a 92. Surface resistance of an insulating material is reduced due to the (a) smoky and dirty atmosphere (b) humidity in the atmosphere (c) both (a) and (b) (d) neither (a) nor (b) Ans: c 91. For a hole which of the following statements is incorrect ? (a) Holes can exist in certain semiconductors only (b) Holes can exist in any material including conductors (c) Holes may constitute an electric current (d) Holes can be considered as a net positive charge Ans: b 98. (a) equal to (b) less than (c) greater than (d) any of the above Ans: c 97. is an element used in semiconductors whose atoms have three valence electrons. In conductors conduction of electricity takes place due to movement of (a) electrons only (b) positive ions only (c) negative ions only (d) positive and negative ions (e) none of the above Ans: a 93. The current due to electron flow in conduction band is the hole current in valence band. The material is (a) insulator (6) metal (c) intrinsic semiconductor (d) none of the above Ans: b 95.in/2014/09/100topelectricalengineering.2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… (d) Cold work (e) All of the above Ans: e 89. The carbon percentage is least in (a) low carbon steel (b) wrought iron (c) cast iron (d) malleable iron Ans: b 94.blogspot. The conductivity of an extrinsic semiconductor with temperature (a) decreases (b) increases (c) remains constant Ans: c 96. For a particular material the Hall coefficient was found to be zero. 2/24/2015 100 TOP Electrical Engineering Materials Electrical Engineering Multiple choice Questions and Answers | MCQs preparation for Engineering Competit… 100. http://engineeringmcqs. Powered by Blogger. By which of the following systems electric power may be transmitted ? . Tubes.blogspot. Engines Questions and Answers pdf free download 1.. competitive examination and entrance test.. Engines Mechanical Engineering Multiple choice Questions and Answers List I. Which of the following variables controls the physical properties of a perfect. unit of power is (a) Henry (b) coulomb (c) watt (d) watthour A.... Plates... For germanium the forbidden energy gap is (a) 0. Mechanical Engineering Multiple Choice Questions and Answers List Mechanical Engineering questions and answers with explanation for interview. The S. 250 TOP I. 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