electrical engineering MCQs – Page 306

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 Review each marked answer and report any item that may be outdated or unclear.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
6101. Conductance is analogous to_____________?
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A. reluctance

B. permeance

C. inductance

D. flux

6102. When both the inductance and resistance of a coil are doubled the value of________________?
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A. time constant is halved

B. time constant remains unchanged

C. final steady current is doubled

D. initial rate of rise of current is doubled

6103. Energy stored by a coil is doubled when its current is increased by percent___________?
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A. 41.4

B. 100

C. 50

D. 25

6104. Relative permeability of vacuum is__________?
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A. 4n x 10- H/m

B. 1

C. 1/4JI

D. 1 H/m

6105. In a magnetic material hysteresis loss takes place primarily due to___________?
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A. molecular friction

B. rapid reversals of its magnetisation

C. it high retentivity

D. flux density lagging behind magnetising force

6106. Silicon steel is used in electrical machines because it has_____________?
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A. low coercivity

B. low retentivity

C. high coercivity

D. low hysteresis loss
6107. The property of a material which opposes the creation of magnetic flux in it is known as_____________?
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A. reluctivity

B. permeance

C. reluctance

D. magnetomotive force

6108. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs
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A. 50

B. 20

C. 500

D. 0.05

6109. Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss
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A. low, low

B. low, high

C. high, low

D. high, high

6110. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
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A. E.m.f.

B. Conductivity

C. Current density

D. Current
6111. The relative permeability of a ferromagnetic material is_____________?
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A. more than 100 or 1000

B. less than one

C. more than 10

D. more than one

6112. Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
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A. high, high

B. low, low

C. low, high

D. high, low

6113. The unit of reluctance is_____________?
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A. metre/henry

B. 1/henry

C. henry/metre

D. henry

6114. Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
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A. produces fringing

B. leads to their increased weight

C. lowers their power efficiency

D. increases their cost of manufacture

6115. Permeability in a magnetic circuit corresponds to________ in an electric circuit
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A. resistance

B. conductivity

C. resistivity

D. conductance

6116. A ferrite core has less eddy current loss than an iron core because_______________?
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A. ferrites are magnetic

B. ferrites have high resistance

C. ferrites have high hysteresis

D. ferrites have low permeability

6117. Hard steel is suitable for making permanent magnets because_____________?
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A. it has good residual magnetism

B. its mechanical strength is high

C. its hysteresis loop has large area

D. its mechanical strength is low

6118. Conductivity is analogous to____________?
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A. resistivity

B. permeability

C. inductance

D. retentivity

6119. Permanent magnets are normally made of_____________?
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A. alnico alloys

B. aluminium

C. wrought iron

D. cast iron

6120. Reciprocal of reluctance is_______________?
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A. reluctivity

B. permeance

C. permeability

D. susceptibility