electrical engineering MCQs – Page 116

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 Review each marked answer and report any item that may be outdated or unclear.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
2301. Negative feedback is employed in __________________?
comments icon0

A. Rectifiers

B. Amplifiers

C. None of the above

D. Oscillators

2302. An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
comments icon0

A. 5K?

B. 1/5K?

C. 11K?

D. 1/11K?
2303. An ideal OP-AMP is an ideal___________?
comments icon0

A. voltage controlled current source

B. Voltage controlled voltage source

C. Current controlled voltage source

D. Current controlled Current source

2304. In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?
comments icon0

A. R2 is open

B. the circuit is operating properly

C. R3 is open

D. R1 is open

2305. A crystal diode utilises .. characteristic for rectification
comments icon0

A. reverse

B. forward

C. none of the above

D. forward or reverse

2306. In a transistor ______________?
comments icon0

A. IC = IE + IB

B. IE = IC + IB

C. IB = IC + IE

D. IE = IC IB

2307. The relation between and a is______________?
comments icon0

A. = 1 / (1 a )

B. = a / (1 + a )

C. = (1 a ) / a

D. = a / (1 a )
2308. The values of h parameter of a transistor in CE arrangement are ____________ arrangement?
comments icon0

A. None of the above

B. Different from that in CB

C. The same as for CC

D. The same as for CB

2309. Hybrid means_____________?
comments icon0

A. None of the above

B. Unique

C. Mixed

D. Single

2310. In an electric room heat convector the method of heating used is______________?
comments icon0

A. arc heating

B. dielectric heating

C. induction heating

D. resistance heating
2311. In an LC circuit, when the capacitor is maximum, the inductor energy is____________?
comments icon0

A. Maximum

B. Half-way between maximum and minimum

C. Minimum

D. None of the above

2312. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________________?
comments icon0
A. 4.8 W

B. 0.3 W

C. 1.2 W

D. 12 W

2313. The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is____________?
comments icon0

A. 200 mA

B. 900 mA

C. 540 mA

D. 1.24 A
2314. If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is_________________?
comments icon0

A. 120 mA

B. 40 mA

C. 50 mA

D. 70 mA
2315. The ripple factor of a half-wave rectifier is_________________?
comments icon0
A. 0.48

B. 2.5

C. 2

D. 1.21

2316. The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is___________?
comments icon0

A. 90o

B. 270o

C. 0o

D. 180o
2317. In a domestic cake baking oven the temperature is controlled by________________?
comments icon0
A. series-parallel operation

B. voltage variation

C. auto-transformer

D. thermostat

2318. The input impedance of a transistor connected in___________arrangement is the highest?
comments icon0

A. none of the above

B. common base

C. common emitter

D. common collector
2319. The value of for a transistor is generally____________?
comments icon0

A. less than 1

B. between 20 and 500

C. above 500

D. 1

2320. One condition for oscillation is_____________?
comments icon0
A. A phase shift around the feedback loop of 0o

B. A gain around the feedback loop of one-third

C. A phase shift around the feedback loop of 180o

D. A gain around the feedback loop of less than 1