electrical engineering MCQs – Page 245

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 Review each marked answer and report any item that may be outdated or unclear.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 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
4881. A thyristor equivalent of a thyratron tube is a _________?
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A. None of above

B. Diac

C. Silicon controlled-rectifier SCR

D. Triac

4882. In a three phase voltage source inverters____________?
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A. Only amplitude of voltage is controllable

B. Only phase is controllable

C. Both amplitude and phase is controllable

D. Amplitude, phase and frequency of voltages should always be controllable
4883. Which of the following is used in SCR to protect from high dV / dt__________________?
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A. Snubber circuit

B. Circuit breaker

C. Equalizing circuit

D. Fuse

4884. In rectifiers, load current flow is_________?
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A. Either (a) or (b)

B. Bidirectional

C. Non directional

D. Unidirectional
4885. Anode of an operational SCR is _______________?
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A. Always negative w.r.t cathode

B. Always negative w.r.t anode

C. Always positive w.r.t cathode

D. Always positive w.r.t anode

4886. For series connected SCRaEURs dynamic equalising circuit consists of___________?
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A. R and C in series but with diode across C

B. R and C in series but with diode across R

C. Series R and diode with C across R

D. Series R and diode with C across R

4887. Ferrites are materials
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A. diamagnetic

B. none of the above

C. paramagnetic

D. ferromagnetic
4888. The bar magnet has____________?
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A. monopole moment

B. the dipole moment

C. none of the above

D. A. and B. both

4889. Which of the following is a vector quantity ?
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A. Flux density

B. Magnetic potential

C. Magnetic field intensity

D. Relative permeability

4890. Tesla is a unit of_____________?
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A. flux density

B. flux

C. field strength

D. inductance

4891. The materials having low retentivity are suitable for making_____________?
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A. temporary magnets

B. weak magnets

C. none of the above

D. permanent magnets

4892. A magnetic field exists around____________?
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A. copper

B. iron

C. aluminium

D. moving charges
4893. In a simple magnetic field the strength of magnet flux_______________?
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A. is constant and has same value in energy part of the magnetic field

B. increases continuously from initial value to final value

C. first increases and then decreases till it becomes zero

D. decreases continuously from initial value to final value

4894. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?
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A. 4

B. 6

C. 2

D. 8

4895. The materials are a bit inferior conductors of magnetic flux than air
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A. paramagnetic

B. diamagnetic

C. dielectric

D. ferromagnetic

4896. A permanent magnet______________?
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A. attracts only ferromagnetic substances

B. attracts ferromagnetic substances and repels all others

C. attracts all paramagnetic substances and repels others

D. attracts some substances and repels others
4897. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
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A. 63.38 N/Wb

B. 633.8 N/Wb

C. 63380 N/Wb

D. 6338 N/Wb
4898. Reciprocal of permeability is____________?
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A. permittivity

B. susceptibility

C. reluctivity

D. conductance

4899. 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______________?
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A. BLI2

B. BLI

C. zero

D. B2LI

4900. Which of the following is the unit of magnetic flux density ?
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A. tesla

B. none of the above

C. weber

D. lumens