electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
4901. The change of cross-sectional area of conductor in magnetic field will affect______________?
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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_______________?
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A. flux density decreases

B. flux density increases

C. core length increases i

D. core area increases

4903. A permeable substance is one_____________?
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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_____________?
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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_____________?
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A. hammering

B. by inductive action of another magnet

C. heating

D. by all above methods
4906. The magneto-motive force is______________?
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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______________?
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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______________?
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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_____________?
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A. joule

B. watt

C. ampere-hour

D. coulomb
4910. The relative permeability of materials is not constant
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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______________?
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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_____________?
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A. vector quantity

B. scalar quantity

C. universal constant

D. pole strength

4913. The direction of magnetic lines of force is________________?
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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_____________?
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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 ?
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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 ?
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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_____________?
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A. none of the above

B. susceptibility

C. relative permeability

D. flux density

4918. The stray line of magnetic flux is defined as_____________?
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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_____________?
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A. ferrites

B. non-ferrous materials

C. ferromagnetic materials

D. diamagnetic materials
4920. In the left hand rule, forefinger always represents______________?
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A. direction of force on the conductor

B. voltage

C. current

D. magnetic field
4921. Which of the following is not a unit of flux?
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A. Telsa

B. All of the above

C. Maxwell

D. Weber

4922. The initial permeability of an iron rod is________________?
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A. the permeability at the end of the iron rod

B. the lowest permeability of the iron rod

C. the permeability almost in non-magnetised state

D. the highest permeability of the iron rod

4923. One telsa is equal to___________?
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A. 1 Wb/m2

B. 1 Wb/mm2

C. 1 Wb/m

D. 1 mWb/m2

4924. 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_________________?
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A. 2 x KT3 N/m

B. 2 x 1(T2 N/m)

C. 2x 1(T7 N/m)

D. 2 x 10?5 N/m

4925. he retentivity (a property) of material is useful for the construction of__________?
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A. electromagnets

B. transformers

C. non-magnetic substances

D. permanent magnets
4926. For which of the following materials the saturation value is the highest ?
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A. Ferromagnetic materials

B. Paramagnetic materials

C. Ferrites

D. Diamagnetic materials

4927. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is________________?
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A. proportional to 7

B. proportional to distance between the conductors

C. inversely proportional to I

D. proportional to X
4928. Gilbert is a unit of_______________?
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A. electromotive force

B. permittivity

C. conductance

D. magnetomotive force
4929. Which of the following type of materials are not very important for engineering applications ?
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A. None of the above

B. Diamagnetic

C. Ferromagnetic

D. Paramagnetic

4930. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?
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A. M/4

B. M/2

C. 2 M

D. M

4931. Out of the following statements, concerning an electric field, which statement is not true ?
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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. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

D. An electric field is defined as a point in space at which an electric charge would experience a force

4932. Substances which have permeability less than the permeability of free space are known as_____________?
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A. paramagnetic

B. ferromagnetic

C. bipolar

D. diamagnetic
4933. Temporary magnets are used in______________?
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A. loud-speakers

B. all of the above

C. motors

D. generators

4934. 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_____________?
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A. 1 N

B. 10 N

C. 0.1 N

D. 100 N

4935. Air gap has_________eluctance as compared to iron or steel path?
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A. little

B. lower

C. zero

D. higher

4936. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?
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A. equal to that of disc and in the same direction

B. less than 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 but in opposite direction

4937. The Biot-savarts law is a general modification of_______________?
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A. Faradays laws

B. Kirchhoffs law

C. Amperes law

D. Lenzs law

4938. A keeper is used to_____________?
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A. provide a closed path for flux

B. restore lost flux

C. amplify flux

D. change the direction of magnetic lines

4939. Core of an electromagnet should have____________?
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A. low coercivity

B. high susceptibility

C. both of the above

D. none of the above

4940. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
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A. 22 x 10-6 N

B. 22 x 10?5 N

C. 22 x 10?8 N

D. 22 x 10?7 N

4941. Which of the following statements is correct ?
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A. The conductivity of ferrites is better than ferromagnetic materials

B. The conductivity of ferrites is very high

C. The conductivity of ferrites is same as that of ferromagnetic materials

D. The conductivity of ferromagnetic materials is better than ferrites

4942. Magnetising steel is normals difficult because____________?
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A. it has low permeability

B. it has high specific gravity

C. it corrodes easily

D. it has high permeability

4943. The main constituent of permalloy is_____________?
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A. chromium

B. nickel

C. cobalt

D. tungsten

4944. Indicate which of the following material does not retain magnetism permanently
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A. None of the above

B. Hardened steel

C. Stainless steel

D. Soft iron
4945. 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 ?
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A. 2.5 AT/m

B. 2500 AT/m

C. 250 AT/m

D. 25 AT/m

4946. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?
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A. will depend on the amount of e.m.f. applied

B. will be zero

C. will be infinite

D. will depend on the radius of the circle
4947. The commonly used material for shielding or screening magnetism is____________?
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A. aluminium

B. copper

C. soft iron

D. brass

4948. The magnetism left in the iron after exciting field has been removed is known as____________?
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A. susceptance

B. reluctance

C. permeance

D. residual magnetism
4949. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?
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A. 0.0048 N-m

B. 0.048 N-m

C. 0.48 N-m

D. 8 N-m

4950. The left hand rule correlates to______________?
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A. self induction, mutual induction and direction of force on a conductor

B. current, magnetic field and direction of force on a conductor

C. magnetic field, electric field and direction of force on a conductor

D. current, induced e.m.f. and direction of force on a conductor