MCQOPTIONS
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MCQOPTIONS
This section includes 95 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. |
Which of the following is expected to have the maximum permeability ?~! |
| A. | Brass |
| B. | Copper |
| C. | Zinc |
| D. | Ebonite |
| Answer» E. | |
| 2. |
The attraction capacity of electromagnet will increase if the~! |
| A. | core length increases i |
| B. | core area increases |
| C. | flux density decreases |
| D. | flux density increases |
| Answer» E. | |
| 3. |
Out of the following statements, concerning an electric field, which statement is not true?%! |
| A. | The electric intensity is a vector quantity |
| B. | The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point |
| C. | An electric field is defined as a point in space at which an electric charge would experience a force |
| D. | Unit field intensity in the exertion of a force of one newton on a charge of one coulomb |
| Answer» C. An electric field is defined as a point in space at which an electric charge would experience a force | |
| 4. |
The unit of relative permeability is%! |
| A. | henry/metre |
| B. | henry |
| C. | henry/sq. m |
| D. | it is dimensionless |
| Answer» E. | |
| 5. |
The main constituent of permalloy is%! |
| A. | cobalt |
| B. | chromium |
| C. | nickel |
| D. | tungsten |
| Answer» D. tungsten | |
| 6. |
*/*_The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is? |
| A. | proportional to 7 |
| B. | proportional to X |
| C. | proportional to distance between the conductors |
| D. | inversely proportional to I |
| Answer» C. proportional to distance between the conductors | |
| 7. |
*/*_Magnetic moment is a? |
| A. | pole strength |
| B. | universal constant |
| C. | scalar quantity |
| D. | vector quantity |
| Answer» E. | |
| 8. |
*/*_The materials are a bit inferior conductors of magnetic flux than air.? |
| A. | ferromagnetic |
| B. | paramagnetic |
| C. | diamagnetic |
| D. | dielectric |
| Answer» D. dielectric | |
| 9. |
*/*_A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be? |
| A. | zero |
| B. | BLI |
| C. | B2LI |
| D. | BLI2 |
| Answer» B. BLI | |
| 10. |
*/*_Reciprocal of permeability is? |
| A. | reluctivity |
| B. | susceptibility |
| C. | permittivity |
| D. | conductance |
| Answer» B. susceptibility | |
| 11. |
*/*_Which of the following type of materials are not very important for engineering applications?? |
| A. | Ferromagnetic |
| B. | Paramagnetic |
| C. | Diamagnetic |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
*/*_Gilbert is a unit of? |
| A. | electromotive force |
| B. | magnetomotive force |
| C. | conductance |
| D. | permittivity |
| Answer» C. conductance | |
| 13. |
*/*_When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon? |
| A. | Resistance of the coil |
| B. | Motion of the magnet |
| C. | Number of turns of the coil |
| D. | Pole strength of the magnet |
| Answer» B. Motion of the magnet | |
| 14. |
*/*_For which of the following materials the net magnetic moment should be zero?? |
| A. | Diamagnetic materials |
| B. | Ferrimagnetic materials |
| C. | Antiferromagnetic materials |
| D. | Antiferrimagnetic materials |
| Answer» D. Antiferrimagnetic materials | |
| 15. |
*/*_A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will? |
| A. | Increase |
| B. | Decrease |
| C. | Remain constant |
| D. | Be excessive |
| Answer» C. Remain constant | |
| 16. |
*/*_The stray line of magnetic flux is defined as? |
| A. | a line vertical to the flux lines |
| B. | the mean length of a ring shaped coil |
| C. | a line of magnetic flux in a non-uniform field |
| D. | a line of magnetic flux which does not follow the designed path |
| Answer» E. | |
| 17. |
*/*_One maxwell is equal to? |
| A. | 10 webers |
| B. | 10 webers |
| C. | 10 webers |
| D. | 10 webers |
| Answer» E. | |
| 18. |
*/*_If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage? |
| A. | Increases |
| B. | Decreases |
| C. | Is zero |
| D. | Will remain constant |
| Answer» D. Will remain constant | |
| 19. |
*/*_The uniform magnetic field is? |
| A. | the field of a set of parallel conductors |
| B. | the field of a single conductor |
| C. | the field in which all lines of magnetic flux are parallel and equidistant |
| D. | none of the above |
| Answer» D. none of the above | |
| 20. |
*/*_What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?? |
| A. | 18.75 At |
| B. | 30 At |
| C. | 300 At |
| D. | 187 At |
| Answer» D. 187 At | |
| 21. |
*/*_The force between two long parallel conductors is inversely proportional to? |
| A. | Radius of conductors |
| B. | Current in one conductor |
| C. | Product of current in two conductors |
| D. | Distance between the conductors |
| Answer» E. | |
| 22. |
*/*_If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity? |
| A. | less than that of disc but in opposite direction |
| B. | equal to that of disc and in the same direction |
| C. | equal to that of disc and in the opposite direction |
| D. | less than that of disc and in the same direction |
| Answer» E. | |
| 23. |
*/*_Unit for quantity of electricity is? |
| A. | ampere-hour |
| B. | watt |
| C. | joule |
| D. | coulomb |
| Answer» E. | |
| 24. |
_ Unit for quantity of electricity is$? |
| A. | ampere-hour |
| B. | watt |
| C. | joule |
| D. | coulomb |
| Answer» E. | |
| 25. |
_ The force between two long parallel conductors is inversely proportional to$? |
| A. | Radius of conductors |
| B. | Current in one conductor |
| C. | Product of current in two conductors |
| D. | Distance between the conductors |
| Answer» E. | |
| 26. |
_ If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity$? |
| A. | less than that of disc but in opposite direction |
| B. | equal to that of disc and in the same direction |
| C. | equal to that of disc and in the opposite direction |
| D. | less than that of disc and in the same direction |
| Answer» E. | |
| 27. |
_ Which of the following is a ferromagnetic material?$? |
| A. | Tungsten |
| B. | Aluminium |
| C. | Copper |
| D. | Nickel |
| Answer» E. | |
| 28. |
_ For which of the following materials the saturation value is the highest?$? |
| A. | Ferromagnetic materials |
| B. | Paramagnetic materials |
| C. | Diamagnetic materials |
| D. | Ferrites |
| Answer» E. | |
| 29. |
_ The susceptibility of paramagnetic materials generally lies between$? |
| A. | KT3 and 1CT6 |
| B. | 1CT3 and 1CT7 |
| C. | KT4 and KT8 |
| D. | 10"2 and KT5 |
| Answer» B. 1CT3 and 1CT7 | |
| 30. |
_ The relative permeability is less than unity is case of$? |
| A. | ferromagnetic materials |
| B. | ferrites |
| C. | non-ferrous materials |
| D. | diamagnetic materials |
| Answer» E. | |
| 31. |
_ The direction of magnetic lines of force is$? |
| A. | from south pole to north pole |
| B. | from north pole to south pole |
| C. | from one end of the magnet to another |
| D. | none of the above |
| Answer» C. from one end of the magnet to another | |
| 32. |
_ What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?$? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 33. |
_ The most effective and quickest may of making a magnet from soft iron is by$? |
| A. | placing it inside a coil carrying current |
| B. | induction |
| C. | the use of permanent magnet |
| D. | rubbing with another magnet |
| Answer» B. induction | |
| 34. |
_ The left hand rule correlates to$? |
| A. | current, induced e.m.f. and direction of force on a conductor |
| B. | magnetic field, electric field and direction of force on a conductor |
| C. | self induction, mutual induction and direction of force on a conductor |
| D. | current, magnetic field and direction of force on a conductor |
| Answer» E. | |
| 35. |
_ In a simple magnetic field the strength of magnet flux$? |
| A. | is constant and has same value in energy part of the magnetic field |
| B. | increases continuously from initial value to final value |
| C. | decreases continuously from initial value to final value |
| D. | first increases and then decreases till it becomes zero |
| Answer» E. | |
| 36. |
_ Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of$? |
| A. | 2 x 1(T2 N/m) |
| B. | 2 x KT3 N/m |
| C. | 2 x 10"5 N/m |
| D. | 2x 1(T7 N/m) |
| Answer» E. | |
| 37. |
_ A permeable substance is one$? |
| A. | which is a good conductor |
| B. | which is a bad conductor |
| C. | which is a strong magnet |
| D. | through which the magnetic lines of force can pass very easily |
| Answer» E. | |
| 38. |
_ Temporary magnets are used in$? |
| A. | loud-speakers |
| B. | generators |
| C. | motors |
| D. | all of the above |
| Answer» E. | |
| 39. |
_ The retentivity (a property) of material is useful for the construction of$? |
| A. | permanent magnets |
| B. | transformers |
| C. | non-magnetic substances |
| D. | electromagnets |
| Answer» B. transformers | |
| 40. |
_ Ferrites are materials.$? |
| A. | paramagnetic |
| B. | diamagnetic |
| C. | ferromagnetic |
| D. | none of the above |
| Answer» D. none of the above | |
| 41. |
__Strength of an electromagnet can be increased by__ |
| A. | increasing the cross-sectional area |
| B. | increasing the number of turns |
| C. | increasing current supply |
| D. | all above methods |
| Answer» E. | |
| 42. |
_The initial permeability of an iron rod is$? |
| A. | the highest permeability of the iron rod |
| B. | the lowest permeability of the iron rod |
| C. | the permeability at the end of the iron rod |
| D. | the permeability almost in non-magnetised state |
| Answer» E. | |
| 43. |
_Ferrites are a sub-group of$? |
| A. | non-magnetic materials |
| B. | ferro-magnetic materials |
| C. | paramagnetic materials |
| D. | ferri-magnetic materials |
| Answer» E. | |
| 44. |
_The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?$? |
| A. | 2500 AT/m |
| B. | 250 AT/m |
| C. | 25 AT/m |
| D. | 2.5 AT/m |
| Answer» C. 25 AT/m | |
| 45. |
_Air gap has_______eluctance as compared to iron or steel path$? |
| A. | little |
| B. | lower |
| C. | higher |
| D. | zero |
| Answer» C. higher | |
| 46. |
_Magnetising steel is normals difficult because$? |
| A. | it corrodes easily |
| B. | it has high permeability |
| C. | it has high specific gravity |
| D. | it has low permeability |
| Answer» E. | |
| 47. |
_One telsa is equal to$? |
| A. | 1 Wb/mm² |
| B. | 1 Wb/m |
| C. | 1 Wb/m² |
| D. | 1 mWb/m² |
| Answer» D. 1 mWb/m¬¨‚⧠| |
| 48. |
_The magnetomotive force is$? |
| A. | the voltage across the two ends of exciting coil |
| B. | the flow of an electric current |
| C. | the sum of all currents embraced by one line of magnetic field |
| D. | the passage of magnetic field through an exciting coil |
| Answer» D. the passage of magnetic field through an exciting coil | |
| 49. |
_The change of cross-sectional area of conductor in magnetic field will affect$? |
| A. | reluctance of conductor |
| B. | resistance of conductor |
| C. | (A) and (B) both in the same way |
| D. | none of the above |
| Answer» D. none of the above | |
| 50. |
_The Biotsavart's law is a general modification of$? |
| A. | Kirchhoff's law |
| B. | Lenz's law |
| C. | Ampere's law |
| D. | Faraday's laws |
| Answer» D. Faraday's laws | |