MCQOPTIONS
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MCQOPTIONS
This section includes 65 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 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 | |
| 2. |
Which of the following materials are diamagnetic ? |
| A. | Silver |
| B. | Copper |
| C. | Silver and copper |
| D. | Iron |
| Answer» D. Iron | |
| 3. |
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle? |
| A. | will be zero |
| B. | will be infinite |
| C. | will depend on the amount of e.m.f. applied |
| D. | will depend on the radius of the circle |
| Answer» E. | |
| 4. |
When an iron piece is placed in a magnetic field_____________? |
| A. | the magnetic lines of force will bend away from their usual paths in order to go away from the piece |
| B. | the magnetic lines of force will bend away from their usual paths in order to pass through the piece |
| C. | the magnetic field will not be affected |
| D. | the iron piece will break |
| Answer» C. the magnetic field will not be affected | |
| 5. |
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 | |
| 6. |
What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ? |
| A. | 2 AT |
| B. | 4 AT |
| C. | 6 AT |
| D. | 10 AT |
| Answer» C. 6 AT | |
| 7. |
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 | |
| 8. |
Unit for quantity of electricity is_____________? |
| A. | ampere-hour |
| B. | watt |
| C. | joule |
| D. | coulomb |
| Answer» E. | |
| 9. |
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________? |
| A. | 100 N |
| B. | 10 N |
| C. | 1 N |
| D. | 0.1 N |
| Answer» E. | |
| 10. |
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. | |
| 11. |
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________? |
| A. | meter is surrounded by strong magnetic fields |
| B. | a soft iron shielding is used |
| C. | a plastic shielding is provided |
| D. | a shielding of anon-magnetic material is used |
| Answer» C. a plastic shielding is provided | |
| 12. |
The use of permanent magnets is. not made in_____________? |
| A. | magnetoes |
| B. | energy meters |
| C. | transformers |
| D. | loud-speakers |
| Answer» D. loud-speakers | |
| 13. |
The unit of relative permeability is_____________? |
| A. | henry/metre |
| B. | henry |
| C. | henry/sq. m |
| D. | it is dimensionless |
| Answer» E. | |
| 14. |
The unit of flux is the same as that of_______________? |
| A. | reluctance |
| B. | resistance |
| C. | permeance |
| D. | pole strength |
| Answer» E. | |
| 15. |
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 | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
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. | |
| 19. |
The relative permeability is less than unity is case of_____________? |
| A. | ferromagnetic materials |
| B. | ferrites |
| C. | non-ferrous materials |
| D. | diamagnetic materials |
| Answer» E. | |
| 20. |
The relative permeability of materials is not constant |
| A. | diamagnetic |
| B. | paramagnetic |
| C. | ferromagnetic |
| D. | insulating |
| Answer» D. insulating | |
| 21. |
The ratio of intensity of magnetisation to the magnetisation force is known as_____________? |
| A. | flux density |
| B. | susceptibility |
| C. | relative permeability |
| D. | none of the above |
| Answer» C. relative permeability | |
| 22. |
The materials having low retentivity are suitable for making_____________? |
| A. | weak magnets |
| B. | temporary magnets |
| C. | permanent magnets |
| D. | none of the above |
| Answer» C. permanent magnets | |
| 23. |
The materials are a bit inferior conductors of magnetic flux than air |
| A. | ferromagnetic |
| B. | paramagnetic |
| C. | diamagnetic |
| D. | dielectric |
| Answer» D. dielectric | |
| 24. |
The main constituent of permalloy is_____________? |
| A. | cobalt |
| B. | chromium |
| C. | nickel |
| D. | tungsten |
| Answer» D. tungsten | |
| 25. |
The magnetism left in the iron after exciting field has been removed is known as____________? |
| A. | permeance |
| B. | residual magnetism |
| C. | susceptance |
| D. | reluctance |
| Answer» C. susceptance | |
| 26. |
The magneto-motive 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 | |
| 27. |
The magnetic reluctance of a material______________? |
| A. | decreases with increasing cross sectional area of material |
| B. | increases with increasing cross-sec-tional area of material |
| C. | does not vary with increasing cross-sectional area of material |
| D. | any of the above |
| Answer» B. increases with increasing cross-sec-tional area of material | |
| 28. |
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. | |
| 29. |
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. | |
| 30. |
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. | |
| 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. |
The commonly used material for shielding or screening magnetism is____________? |
| A. | copper |
| B. | aluminium |
| C. | soft iron |
| D. | brass |
| Answer» D. brass | |
| 33. |
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 | |
| 34. |
The Biot-savart’s law is a general modification of_______________? |
| A. | Kirchhoffs law |
| B. | Lenz’s law |
| C. | Ampere’s law |
| D. | Faraday’s laws |
| Answer» D. Faraday’s laws | |
| 35. |
The bar magnet has____________? |
| A. | the dipole moment |
| B. | monopole moment |
| C. | A. and B. both |
| D. | none of the above |
| Answer» B. monopole moment | |
| 36. |
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. | |
| 37. |
Reciprocal of permeability is____________? |
| A. | reluctivity |
| B. | susceptibility |
| C. | permittivity |
| D. | conductance |
| Answer» B. susceptibility | |
| 38. |
Paramagnetic materials have relative permeability________________? |
| A. | slightly less than unity |
| B. | equal to unity |
| C. | slightly more than unity |
| D. | equal to that ferromagnetic mate rials |
| Answer» D. equal to that ferromagnetic mate rials | |
| 39. |
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/m2 | |
| 40. |
One maxwell is equal to____________? |
| A. | 10 webers |
| B. | 10 webers |
| C. | 10 webers |
| D. | 10 webers |
| Answer» E. | |
| 41. |
Materials subjected to rapid reversal of magnetism should have______________? |
| A. | large area oiB-H loop |
| B. | high permeability and low hysteresis loss |
| C. | high co-ercivity and high retentivity |
| D. | high co-ercivity and low density |
| Answer» C. high co-ercivity and high retentivity | |
| 42. |
Main causes of noisy solenoid are______________? |
| A. | strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force |
| B. | uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts |
| C. | both of above |
| D. | none of the above |
| Answer» D. none of the above | |
| 43. |
Magnetism of a magnet can be destroyed by_____________? |
| A. | heating |
| B. | hammering |
| C. | by inductive action of another magnet |
| D. | by all above methods |
| Answer» E. | |
| 44. |
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. | |
| 45. |
Magnetic moment is a_____________? |
| A. | pole strength |
| B. | universal constant |
| C. | scalar quantity |
| D. | vector quantity |
| Answer» E. | |
| 46. |
Indicate which of the following material does not retain magnetism permanently |
| A. | Soft iron |
| B. | Stainless steel |
| C. | Hardened steel |
| D. | None of the above |
| Answer» B. Stainless steel | |
| 47. |
In the left hand rule, forefinger always represents______________? |
| A. | voltage |
| B. | current |
| C. | magnetic field |
| D. | direction of force on the conductor |
| Answer» D. direction of force on the conductor | |
| 48. |
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. | |
| 49. |
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. | |
| 50. |
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials |
| A. | circular |
| B. | triangular |
| C. | rectangular |
| D. | none of the above |
| Answer» D. none of the above | |