electrical engineering MCQs – Page 248

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 Review each marked answer and report any item that may be outdated or unclear.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

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_____________?
0

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

4951. The use of permanent magnets is. not made in_____________?
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A. energy meters

B. loud-speakers

C. transformers

D. magnetoes

4952. The uniform magnetic field is______________?
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A. the field in which all lines of magnetic flux are parallel and equidistant

B. the field of a set of parallel conductors

C. none of the above

D. the field of a single conductor

4953. The unit of relative permeability is_____________?
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A. it is dimensionless

B. henry/sq. m

C. henry/metre

D. henry

4954. Which of the following is expected to have the maximum permeability ?
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A. Ebonite

B. Copper

C. Brass

D. Zinc

4955. Which of the following statements is correct ?
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A. The magnetic flux inside the exciting coil is same as on its outside surface

B. The magnetic flux inside an exciting coil is zero

C. The magnetic flux inside an exciting coil is lower than its outside surface

D. The magnetic flux inside the exciting coil is greater than its outside surface

4956. Which of the following materials are diamagnetic ?
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A. Silver

B. Copper

C. Iron

D. Silver and copper

4957. The force between two long parallel conductors is inversely proportional to_____________?
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A. radius of conductors

B. current in one conductor

C. distance between the conductors

D. product of current in two conductors

4958. One maxwell is equal to____________?
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A. 10 webers

B. 10 webers

C. 10 webers

D. 10 webers

4959. he retentivity (a property) of material is useful for the construction of_______________?
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A. electromagnets

B. permanent magnets

C. non-magnetic substances

D. transformers

4960. The magnetic reluctance of a material______________?
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A. decreases with increasing cross sectional area of material

B. does not vary with increasing cross-sectional area of material

C. any of the above

D. increases with increasing cross-sec-tional area of material

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