electrical engineering MCQs – Page 246

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4901. The change of cross-sectional area of conductor in magnetic field will affect______________?
0

A. reluctance of conductor

B. resistance of conductor

C. A. and B. both in the same way

D. none of the above

4902. The attraction capacity of electromagnet will increase if the_______________?
0

A. flux density decreases

B. flux density increases

C. core length increases i

D. core area increases

4903. A permeable substance is one_____________?
0

A. which is a good conductor

B. through which the magnetic lines of force can pass very easily

C. which is a strong magnet

D. which is a bad conductor

4904. When an iron piece is placed in a magnetic field_____________?
0

A. the magnetic field will not be affected

B. the magnetic lines of force will bend away from their usual paths in order to go away from the piece

C. the magnetic lines of force will bend away from their usual paths in order to pass through the piece

D. the iron piece will break

4905. Magnetism of a magnet can be destroyed by_____________?
0

A. hammering

B. by inductive action of another magnet

C. heating

D. by all above methods

4906. The magneto-motive force is______________?
0

A. the voltage across the two ends of exciting coil

B. the passage of magnetic field through an exciting coil

C. the sum of all currents embraced by one line of magnetic field

D. the flow of an electric current

4907. Susceptibility is positive for______________?
0

A. diamagnetic substances

B. none of the above

C. non-magnetic substances

D. ferromagnetic substances

4908. Materials subjected to rapid reversal of magnetism should have______________?
0

A. high co-ercivity and high retentivity

B. high co-ercivity and low density

C. large area oiB-H loop

D. high permeability and low hysteresis loss

4909. Unit for quantity of electricity is_____________?
0

A. joule

B. watt

C. ampere-hour

D. coulomb

4910. The relative permeability of materials is not constant
0

A. diamagnetic

B. insulating

C. ferromagnetic

D. paramagnetic

4911. 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______________?
0

A. a plastic shielding is provided

B. meter is surrounded by strong magnetic fields

C. a soft iron shielding is used

D. a shielding of anon-magnetic material is used

4912. Magnetic moment is a_____________?
0

A. vector quantity

B. scalar quantity

C. universal constant

D. pole strength

4913. The direction of magnetic lines of force is________________?
0

A. from one end of the magnet to another

B. none of the above

C. from south pole to north pole

D. from north pole to south pole

4914. A material which is slightly repelled by a magnetic field is known as_____________?
0

A. paramagnetic material

B. diamagnetic material

C. conducting material

D. ferromagnetic material

4915. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
0

A. Decreases

B. Increases

C. Remains same

D. First increases and then decreases depending on the depth of iron insertion

4916. How does the magnetic compass needle behave in a magnetic field ?
0

A. None of the above

B. It assures a position which follows a line of magnetic flux

C. It assures a position right angle to magnetic field

D. It starts rotating

4917. The ratio of intensity of magnetisation to the magnetisation force is known as_____________?
0

A. none of the above

B. susceptibility

C. relative permeability

D. flux density

4918. The stray line of magnetic flux is defined as_____________?
0

A. a line of magnetic flux in a non-uniform field

B. a line of magnetic flux which does not follow the designed path

C. a line vertical to the flux lines

D. the mean length of a ring shaped coil

4919. The relative permeability is less than unity is case of_____________?
0

A. ferrites

B. non-ferrous materials

C. ferromagnetic materials

D. diamagnetic materials

4920. In the left hand rule, forefinger always represents______________?
0

A. direction of force on the conductor

B. voltage

C. current

D. magnetic field

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