electrical engineering MCQs – Page 304

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 Review each marked answer and report any item that may be outdated or unclear.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
6061. A n-channel D-MOSFET with a positive VGS is operating in _______________?
comments icon0
A. the enhancement-mode

B. cut off

C. saturation

D. the depletion-mode

6062. A MOSFET can be operated with________________?
comments icon0

A. negative gate voltage only

B. positive gate voltage only

C. none of the above

D. positive as well as negative gate voltage
6063. A JFET is also called____________ transistor?
comments icon0

A. bipolar

B. unipolar

C. unijunction

D. none of the above

6064. A JFET has three terminals, namely________________?
comments icon0

A. emitter, base, collector

B. none of the above

C. cathode, anode, grid

D. source, gate, drain
6065. A MOSFET uses the electric field of a _______________to control the channel current?
comments icon0

A. battery

B. none of the above

C. generator

D. capacitor
6066. n a common-source JFET amplifier, the output voltage is _____________?
comments icon0

A. taken at the source

B. in phase with the input

C. 180o out of phase with the input

D. 90o out of phase with the input

6067. If load resistance in the above question (Q.49) is removed, the output voltage will_____________?
comments icon0
A. increase

B. stay the same

C. decrease

D. be zero

6068. If the gate of a JFET is made less negative, the width of the conducting channel__________________?
comments icon0

A. remains the same

B. is increased

C. none of the above

D. is decreased

6069. In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ______________?
comments icon0

A. none of the above

B. have moderate gap

C. almost touch each other

D. have large gap

6070. The input impedance of a MOSFET is of the order of______________?
comments icon0

A. kO

B. several MO

C. O

D. a few hundred O

6071. In a FET, there are _____________pn junctions at the sides?
comments icon0

A. four

B. three

C. two

D. five

6072. In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is_______________?
comments icon0

A. 8.75

B. 11.4

C. 1

D. 3.2

6073. A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ______________?
comments icon0

A. the voltage gain will increase

B. the Q-point will shift

C. the voltage gain will decrease

D. the transconductance will increase

6074. The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube?
comments icon0

A. none of the above

B. anode

C. cathode

D. grid cut off
6075. A MOSFET has______________ terminals?
comments icon0
A. three

B. four

C. two

D. five

6076. If the cross-sectional area of the channel in n-channel JEFT increases, the drain current _____________?
comments icon0

A. is decreased

B. remains the same

C. is increased

D. none of the above

6077. A CS JFET amplifier has a load resistance of 10 kO , RD= 820O . If gm= 5mS and Vin= 500 mV, the output signal voltage is__________________?
comments icon0

A. 25 V

B. 1.89 V

C. 2.05 V

D. 0.5 V

6078. Which of the following devices has the highest input impedance ?
comments icon0

A. ordinary transistor

B. Crystal diode

C. JFET

D. MOSFET
6079. A JFET has ____________ power gain?
comments icon0

A. very small

B. small

C. very high

D. none of the above

6080. The input control parameter of a JFET is __________________?
comments icon0

A. drain voltage

B. source voltage

C. gate voltage

D. gate current