MCQOPTIONS
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MCQOPTIONS
This section includes 69 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following affect greatly the resistivity of electrical conductors ? |
| A. | Composition |
| B. | Pressure |
| C. | Size |
| D. | Temperature |
| Answer» B. Pressure | |
| 2. |
Total number of crystal systems is____________? |
| A. | 2 |
| B. | 4 |
| C. | 7 |
| D. | 12 |
| Answer» D. 12 | |
| 3. |
Thermonic emission occurs in______________? |
| A. | vacuum tubes |
| B. | copper conductors |
| C. | ferrite cores |
| D. | transistors |
| Answer» B. copper conductors | |
| 4. |
Thermocouples are mainly used for the measurement of_____________? |
| A. | temperature |
| B. | resistance |
| C. | eddy currents |
| D. | coupling co-efficient |
| Answer» B. resistance | |
| 5. |
The value of critical field below the transition temperature will_______________? |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | any of the above |
| Answer» B. decrease | |
| 6. |
The transition temperature of mercury is____________? |
| A. | 18.0°K |
| B. | 9.22°K |
| C. | 4.12°K |
| D. | 1.14’K |
| Answer» D. 1.14’K | |
| 7. |
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 |
| Answer» B. space lattice | |
| 8. |
The superconductivity is due to____________? |
| A. | the crystal structure having no atomic vibration at 0°K |
| B. | all electrons interact in the super-conducting state |
| C. | the electrons jump into nucleus at 0°K |
| D. | none of the above |
| Answer» B. all electrons interact in the super-conducting state | |
| 9. |
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 |
| Answer» D. none of the above | |
| 10. |
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 |
| Answer» B. the electron density varies with temperature | |
| 11. |
The photo-electric effect occurs only when the incident light has more than a certain critical____________? |
| A. | intensity |
| B. | speed |
| C. | frequency |
| D. | wave length |
| Answer» D. wave length | |
| 12. |
The number of atoms per unit cell in B.C.C. structure is_____________? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» C. 4 | |
| 13. |
The minority carrier concentration is largely a function of_____________? |
| A. | forward biasing voltage |
| B. | reverse biasing voltage |
| C. | temperature |
| D. | the amount of doping |
| Answer» D. the amount of doping | |
| 14. |
The metal having the lowest temperature coefficient of resistance is_________________? |
| A. | gold |
| B. | copper |
| C. | aluminium |
| D. | kanthal |
| Answer» B. copper | |
| 15. |
The kinetic energy of a bounded electron is______________? |
| A. | less than that of unbounded electron |
| B. | greater than that of unbounded electron |
| C. | equal to that of unbounded electron |
| D. | infinite |
| E. | none of the above |
| Answer» B. greater than that of unbounded electron | |
| 16. |
The impurity atoms is semiconductors_____________? |
| A. | inject more charge carriers |
| B. | reduce the energy gap |
| C. | increase the kinetic energy of valence electrons |
| D. | all of the above |
| Answer» C. increase the kinetic energy of valence electrons | |
| 17. |
The formula __________ determines the number of electrons that can be accommodated in any level? |
| A. | 2n2 |
| B. | 4n2 |
| C. | 2n3 |
| D. | 4ns |
| Answer» B. 4n2 | |
| 18. |
The forbidden gap in an insulator is________________? |
| A. | large |
| B. | small |
| C. | nil |
| D. | any of the above |
| Answer» B. small | |
| 19. |
The current due to electron flow in conduction band is the hole current in valence band? |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | any of the above |
| Answer» D. any of the above | |
| 20. |
The covalent bond is formed by_______________? |
| A. | transfer of electrons between atoms |
| B. | sharing of electrons between atoms |
| C. | sharing of variable number of electrons by a variable number of atoms |
| D. | none of the above |
| Answer» C. sharing of variable number of electrons by a variable number of atoms | |
| 21. |
The converse of hardness is known as______________? |
| A. | malleability |
| B. | toughness |
| C. | softness |
| D. | none of the above |
| Answer» D. none of the above | |
| 22. |
The conductors have transport phenomena of electrons due to____________? |
| A. | electric field |
| B. | magnetic field |
| C. | electromagnetic field |
| D. | none of the above |
| Answer» B. magnetic field | |
| 23. |
The conductivity of an extrinsic semiconductor with temperature________________? |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| Answer» D. | |
| 24. |
The conductivity of a metal is determined by____________? |
| A. | the electronic concentration and the mobility of the free electrons |
| B. | the number of valence electrons per atom |
| C. | either (A) or (B) |
| D. | none of the above |
| Answer» B. the number of valence electrons per atom | |
| 25. |
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 |
| Answer» B. increasing its temperature | |
| 26. |
The conduction of electricity, in semiconductors, takes place due to movement of______________? |
| A. | positive ions only |
| B. | negative ions only |
| C. | positive and negative ions |
| D. | electrons and holes |
| Answer» E. | |
| 27. |
The coils of D.C. motor starter are wound with wire of_______________? |
| A. | copper |
| B. | kanthal |
| C. | manganin |
| D. | nichrome |
| Answer» D. nichrome | |
| 28. |
The co-ordination number of a simple cubic structure is______________? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 29. |
The carbon percentage is least in__________________? |
| A. | low carbon steel |
| B. | wrought iron |
| C. | cast iron |
| D. | malleable iron |
| Answer» C. cast iron | |
| 30. |
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 |
| Answer» F. | |
| 31. |
Piezoelectric materials serve as a source of ____________ ? |
| A. | resonant waves |
| B. | musical waves |
| C. | microwaves |
| D. | ultrasonic waves |
| Answer» E. | |
| 32. |
Overhead telephone wires are made of_____________? |
| A. | aluminium |
| B. | steel |
| C. | ACSR conductors |
| D. | copper |
| Answer» C. ACSR conductors | |
| 33. |
Non-linear resistors______________? |
| A. | produce harmonic distortion |
| B. | follows Ohm’s law at low temperatures only |
| C. | result in non-uniform heating |
| D. | none of the above |
| Answer» B. follows Ohm’s law at low temperatures only | |
| 34. |
Most of the common metals have _________ structure? |
| A. | linear |
| B. | hexagonal |
| C. | orthorhombic |
| D. | cubic |
| Answer» E. | |
| 35. |
Mercury as an electric contact material is_______________? |
| A. | a liquid |
| B. | a metal |
| C. | a metal liquid |
| D. | a gas |
| Answer» D. a gas | |
| 36. |
Low resistivity materials are used in__________? |
| A. | transformer, motor and generator windings |
| B. | transmission and distribution lines |
| C. | house wiring |
| D. | all above applications |
| Answer» E. | |
| 37. |
_____________is viscoelastic? |
| A. | Cast-iron |
| B. | Graphite |
| C. | Rubber |
| D. | Glass |
| Answer» D. Glass | |
| 38. |
is the property of absorbing moisture from atmosphere_____________? |
| A. | Solubility |
| B. | Viscosity |
| C. | Porosity |
| D. | Hygroscopicity |
| Answer» E. | |
| 39. |
__________ is the main constituent of glass? |
| A. | Fe203 |
| B. | Si02 |
| C. | AI2O3 |
| D. | B2O3 |
| Answer» C. AI2O3 | |
| 40. |
___________ is most commonly used for making magnetic recording tape? |
| A. | Silver nitrate |
| B. | Ferric oxide |
| C. | Small particles of iron |
| D. | Silicon-iron |
| Answer» C. Small particles of iron | |
| 41. |
_________ is an example of piezoelectric material? |
| A. | Glass |
| B. | Quartz |
| C. | Corrundum |
| D. | Neoprene |
| Answer» C. Corrundum | |
| 42. |
is an element used in semiconductors whose atoms have three valence electrons? |
| A. | An acceptor |
| B. | A donor |
| C. | Germanium |
| D. | Silicon |
| Answer» B. A donor | |
| 43. |
is a negatively charged particle present in an atom______________? |
| A. | Proton |
| B. | Neutron |
| C. | Electron |
| D. | None of the above |
| Answer» D. None of the above | |
| 44. |
__________ is a hard solder? |
| A. | Tin-lead |
| B. | Tin-silver-lead |
| C. | Copper-zinc |
| D. | None of the above |
| Answer» D. None of the above | |
| 45. |
In graphite, bonding is____________? |
| A. | covalent |
| B. | metallic |
| C. | Vander Waals |
| D. | Vander Waals and covalent |
| Answer» E. | |
| 46. |
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 |
| Answer» B. positive ions only | |
| 47. |
In a superconductor the value of critical density depends upon______________? |
| A. | magnetic field strength |
| B. | temperature |
| C. | either (A) or (B) |
| D. | both (A) and (B) |
| Answer» E. | |
| 48. |
In a crystal, 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 |
| Answer» D. | |
| 49. |
If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as____________? |
| A. | non-linear conductor |
| B. | reverse conductor |
| C. | bad-conductor |
| D. | non-conductor |
| Answer» B. reverse conductor | |
| 50. |
highest conductivity_____________? |
| A. | lowest temperature co-efficient |
| B. | good mechanical strength |
| C. | good corrosion resistance |
| D. | easy solderable and drawable quality |
| E. | all of the above |
| Answer» F. | |