electrical engineering MCQs – Page 305

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 Review each marked answer and report any item that may be outdated or unclear.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
6081. The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve?
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A. tetrode

B. triode

C. diode

D. pentode
6082. A MOSFET differs from a JFET mainly because _________________?
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A. the MOSFET has two gates

B. none of the above

C. the JFET has a pn junction

D. of power rating

6083. A certain p-channel E-MOSFET has VGS(th) = -2V. If VGS= 0V, the drain current is ____________?
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A. ID(on)

B. IDSS

C. 0 mA

D. maximum

6084. In class A operation, the input circuit of a JFET is ____________ biased?
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A. reverse

B. forward

C. not

D. none of the above

6085. The transconductance of a JFET ranges from ________________?
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A. above 1000 mA/V

B. 100 to 500 mA/V

C. 0.5 to 30 mA/V

D. 500 to 1000 mA/V

6086. The channel of a JFET is between the ________________?
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A. input and output

B. gate and source

C. gate and drain

D. drain and source
6087. The source terminal of a JEFT corresponds to _____________ of a vacuum tube?
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A. grid

B. plate

C. cathode

D. none of the above

6088. If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ______________?
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A. is decreased

B. none of the above

C. is increased

D. remains the same

6089. The gate voltage in a JFET at which drain current becomes zero is called ______________ voltage?
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A. cut-off

B. active

C. pinch-off

D. saturation

6090. For VGS = 0 V, the drain current becomes constant when VDS exceeds ________________?
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A. cut off

B. V

C. VDD

D. VP
6091. A common base configuration of a pnp transistor is analogous to _____________?of a JFET
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A. common gate configuration

B. common source configuration

C. common drain configuration

D. none of the above

6092. At cut-off, the JFET channel is _____________?
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A. at its widest point

B. completely closed by the depletion region

C. reverse baised

D. extremely narrow

6093. The rate of rise of current through an inductive coil is maximum_____________?
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A. at 63.2% of its maximum steady value

B. at the start of the current flow

C. after one time constant

D. near the final maximum value of current

6094. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?
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A. large

B. small

C. zero

D. none of the above

6095. A material for good magnetic memory should have____________?
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A. low hysteresis loss

B. high retentivity

C. low retentivity

D. high permeability

6096. The unit of retentivity is____________?
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A. ampere turn/meter

B. weber/sq. m

C. ampere turn

D. weber

6097. Hysteresis loss least depends on____________?
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A. steinmetz coefficient of material

B. ambient temperature

C. frequency

D. volume of material

6098. An air gap is usually inserted in magnetic circuits to____________?
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A. prevent saturation

B. increase the flux

C. none of the above

D. increase m.m.f.

6099. Laminated cores, in electrical machines, are used to reduce____________?
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A. all of the above

B. eddy current loss

C. hysteresis loss

D. copper loss

6100. The unit of magnetic flux is______________?
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A. ampereturn/weber

B. ampere/metre

C. weber

D. henry