MCQOPTIONS
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MCQOPTIONS
This section includes 46 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When a material is in superconducting state and a magnetic field is applied~! |
| A. | The superconducting property is not affected |
| B. | The superconducting property may be affected and resistivity may increase from zero to a low value |
| C. | The superconducting property may be destroyed |
| D. | The material may become an insulator |
| Answer» D. The material may become an insulator | |
| 2. |
Many compounds also exhibit semiconducting properties.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Electric dipole moment is expressed in debye unit.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Debye temperature of metals is%! |
| A. | About 10 K |
| B. | About 200 K |
| C. | About 600 K |
| D. | About 2 K |
| Answer» C. About 600 K | |
| 7. |
A vacant electronic state moves in the same direction as would a positive charge carrier.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
In solid insulator materials having only one kind of atom, the types of polarization which exist are%! |
| A. | Electronic only |
| B. | Electronic and ionic |
| C. | Electronic, ionic and permanent |
| Answer» B. Electronic and ionic | |
| 9. |
At room temperature the number of conducting electrons in an intrinsic semiconductor%! |
| A. | Is almost equal to the number of valence electrons |
| B. | Is about half the number of valence electrons |
| C. | Is small as compared to the number of valence electrons |
| D. | Is a very small fraction of the number of valence electrons |
| Answer» E. | |
| 10. |
Schrodinger wave equation is a%! |
| A. | Linear equation |
| B. | Differential equation |
| C. | Partial differential equation |
| D. | None of the above |
| Answer» D. None of the above | |
| 11. |
Spontaneous magnetisation is characteristic of ferromagnetic materials.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Wood is a diamagnetic material.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as%! |
| A. | Matthiessen’s rule |
| B. | Debye rule |
| C. | Curie rule |
| D. | Onne’s rule |
| Answer» B. Debye rule | |
| 14. |
In a metal, the valence electrons%! |
| A. | Are not shared |
| B. | Are shared only between neighbouring atoms |
| C. | Are shared by all atoms |
| D. | Either B or C |
| Answer» D. Either B or C | |
| 15. |
Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called%! |
| A. | Debye temperature |
| B. | Curie temperature |
| C. | Neel temperature |
| D. | Transition temperature |
| Answer» B. Curie temperature | |
| 16. |
Ferrimagnetic materials have anti parallel orientation of equal moments of permanent dipoles.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
An atom of a rare gas is placed is an electric field E. Then%! |
| A. | The nucleus will be shifted in the direction of E by an amount which is proportional to E. |
| B. | The nucleus will not be shifted. |
| C. | The nucleus will be shifted in the direction of E by an amount which is independent of E. |
| D. | The nucleus will be shifted in a direction opposite to that of E. |
| Answer» B. The nucleus will not be shifted. | |
| 18. |
The merger of hole and free electron is called%! |
| A. | Covalent bonding |
| B. | Recombination |
| C. | Thermal energy |
| D. | Free electrons |
| Answer» C. Thermal energy | |
| 19. |
A characteristic property of crystal is its periodicity of structure.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
Electrical contact materials used in switches, brushes, relay must possess%! |
| A. | High thermal conductivity and high melting point |
| B. | Low thermal conductivity and low melting pointL |
| C. | High thermal conductivity and low melting point |
| D. | Low thermal conductivity and high melting point |
| Answer» B. Low thermal conductivity and low melting pointL | |
| 21. |
The dielectric losses do not depend on frequency.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
Which inductor is used at high frequencies?%! |
| A. | Cast iron cored |
| B. | Sheet steel cored |
| C. | Iron alloy cored |
| D. | Ceramic cored |
| Answer» E. | |
| 23. |
The number of protons in a silicon atom are%! |
| A. | 4 |
| B. | 8 |
| C. | 12 |
| D. | 14 |
| Answer» E. | |
| 24. |
The resistance of a photoconductor%! |
| A. | Increases with increase in light intensity |
| B. | Decreases with increase in light intensity |
| C. | May increase or decrease with increase in light intensity |
| D. | Remains constant |
| Answer» C. May increase or decrease with increase in light intensity | |
| 25. |
The unit for mmf is%! |
| A. | A |
| B. | Wb |
| C. | T |
| D. | V |
| Answer» B. Wb | |
| 26. |
The fact that domains exhibits spontaneous magnetisation is%! |
| A. | First hypothesis is of Curie |
| B. | Second hypothesis is of Weiss |
| C. | Curie-Weiss law |
| D. | Boltzmann’s statistics |
| Answer» C. Curie-Weiss law | |
| 27. |
The materials which become polarized on the application of mechanical stress are called piezoelectric.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
The elements which become superconducting at extremely low temperatures are%! |
| A. | Good conductors at room temperature |
| B. | Ferromagnetic at room temperature |
| C. | Relatively poor conductors at room temperature |
| D. | Insulators at room temperature |
| Answer» D. Insulators at room temperature | |
| 29. |
In an intrinsic semiconductor, at a given temperature T%! |
| A. | The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination |
| B. | The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination |
| C. | The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination |
| D. | Any of the above |
| Answer» B. The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination | |
| 30. |
When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 31. |
If a small amount of Cu is added to Ni conductor, then%! |
| A. | Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni |
| B. | Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres |
| C. | Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects |
| D. | Resistivity of Ni remains the same |
| Answer» D. Resistivity of Ni remains the same | |
| 32. |
As the viscosity of a liquid increases, the relaxation time%! |
| A. | Remains constant |
| B. | Increases |
| C. | Decreases |
| D. | First decreases then increases |
| Answer» C. Decreases | |
| 33. |
If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 34. |
Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.%! |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 2 and 3 only | |
| 35. |
The phenomenon of dielectric hysteresis occurs with%! |
| A. | DC |
| B. | AC |
| C. | Both AC and DC |
| D. | None of the above |
| Answer» C. Both AC and DC | |
| 36. |
The most important set of specifications of transformer oil include%! |
| A. | dielectric strength and viscosity |
| B. | dielectric strength and flash point |
| C. | viscosity and flash point |
| D. | flash point and viscosity |
| Answer» B. dielectric strength and flash point | |
| 37. |
Which inductor is linear?%! |
| A. | Air cored |
| B. | Cast iron cored |
| C. | Sheet steel cored |
| D. | Iron alloy cored |
| Answer» B. Cast iron cored | |
| 38. |
With increase in temperature, the electrical conductivity would%! |
| A. | Increase in metals as well as in intrinsic semiconductor |
| B. | Increase in metals but decrease in intrinsic semiconductor |
| C. | Decrease in metals but increase in intrinsic semiconductor |
| D. | Decrease in metals as well as in intrinsic semiconductor |
| Answer» D. Decrease in metals as well as in intrinsic semiconductor | |
| 39. |
On the basis of the type of chemical bonds, solids may be classified into%! |
| A. | Ionic crystals |
| B. | Ionic and valence crystals |
| C. | Ionic crystal, valence crystals and metals |
| D. | Ionic crystals, valence crystals, metal and vander wall crystals |
| Answer» E. | |
| 40. |
Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is%! |
| A. | Normal to both current and magnetic field |
| B. | In the same direction as current |
| C. | In a direction anti parallel to magnetic field |
| D. | None of the above |
| Answer» B. In the same direction as current | |
| 41. |
Nickel is a non-magnetic material.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 42. |
For making a capacitor it is better to have a dielectric having%! |
| A. | High permittivity |
| B. | Low permittivity |
| C. | Permittivity same as that of air |
| D. | Permittivity which is neither high nor low |
| Answer» B. Low permittivity | |
| 43. |
The number of protons in a copper atom are%! |
| A. | 2 |
| B. | 9 |
| C. | 11 |
| D. | 29 |
| Answer» E. | |
| 44. |
In van der walls crystals, there exists a high degree of stability of the outer electron shell.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 45. |
As the atoms of rare gases become larger, electronic polarizability%! |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | May increase or decrease |
| Answer» D. May increase or decrease | |
| 46. |
The residual resistivity of a binary alloy at 0 K is%! |
| A. | Sum of residual resistivities of component metals |
| B. | Difference of residual resistivities of component metals |
| C. | Product of residual resistivities of component metals |
| D. | Dependent on the concentration of minor component in the alloy |
| Answer» E. | |