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
2351. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?
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A. 1.4v

B. 1 v

C. 2v

D. 2.8v

2352. As the temperature of a transistor goes up, the base-emitter resistance___________?
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A. increases

B. none of the above

C. remains the same

D. decreases
2353. _________ has the highest value of thermal conductivity?
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A. Steel

B. Copper

C. Brass

D. Aluminium

2354. IC = IB +__________?
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A. ICEO

B. IC

C. ICBO

D. aIE

2355. A zener diode has ______________ breakdown voltage?
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A. undefined

B. none of the above

C. zero

D. sharp
2356. Factors on which soil resistance depends_______________?
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A. all the above

B. moisture

C. Nacl

D. depth of the electrode

2357. The crystal oscillator frequency is very stable due to___________of the crystal?
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A. High Q

B. Low Q

C. Vibrations

D. Rigidity

2358. Resistance variation method of temperature control is done by connecting resistance elements in_____________?
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A. series-parallel connections

B. star-delta connections

C. parallel

D. all of the above ways

E. series

2359. The leakage current in CE arrangement is____________that in CB arrangement?
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A. none of the above

B. more than

C. the same as

D. less than

2360. Thermal runaway is not possible in FET because as the temperature of FET increases_________________?
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A. none of the above

B. the transconductance increases

C. the drain current increases

D. the mobility decreases
2361. Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
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A. high input resistance

B. input voltage dependent linear transfer characteristic

C. high voltage gain

D. high CMRR
2362. A crystal diode has forward resistance of the order of ________________?
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A. ?

B. M?

C. k?

D. none of the above

2363. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?
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A. Decreases

B. Remains the same

C. Increases

D. Insufficient data

2364. Moisture content in the soil __________ the earth soil resistance?
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A. does not affect

B. none of the above

C. increase

D. decrease
2365. is used for heating non-conducting materials?
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A. Arc heating

B. Eddy current heating

C. Dielectric heating

D. Induction heating

2366. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is______________?
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A. 490 mA

B. 12:00 AM

C. 800 mA

D. 310 mA

2367. An oscillator employs___________feedback?
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A. Positive

B. Negative

C. Data insufficient

D. Neither positive nor negative

2368. The output impedance of a transistor is____________?
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A. low

B. high

C. very low

D. zero

2369. If temperature changes, h parameters of a transistor ________________?
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A. Also change

B. Do not change

C. None of the above

D. May or may not change

2370. The base of a transistor is____________doped?
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A. none of the above

B. heavily

C. lightly

D. moderately

2371. The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become______________?
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A. 5 db

B. 97 db</strong>

C. 103 db

D. 300 db

2372. A zener diode is always_______________ connected?
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A. reverse

B. none of the above

C. forward

D. either reverse or forward

2373. A crystal diode is used as______________?
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A. an amplifier

B. a voltage regulator

C. an oscillator

D. a rectifier
2374. In an electric press mica is used_____________?
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A. for induction heating

B. for dielectric heating

C. as a device for power factor improvement

D. as an insulator
2375. An important limitation of a crystal oscillator is____________?
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A. Its low output

B. Its high output

C. Less availability of quartz crystal

D. Its high Q

2376. By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
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A. Coreless transformers

B. Motor-generator set

C. Current transformers

D. Multi-phase transformer

2377. A transistor has____________?
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A. four pn junctions

B. one pn junction

C. three pn junctions

D. two pn junctions
2378. In an LC oscillator, the frequency of oscillator is____________L or C?
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A. Inversely proportional to square root of

B. Proportional to square of

C. Directly proportional to

D. Independent of the values of

2379. Hartley oscillator is commonly used in______________?
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A. Radio receivers

B. None of the above

C. Radio transmitters

D. TV receivers

2380. IC = [a / (1 a )] IB +_____________?
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A. IC

B. ICEO

C. (1 a ) IB

D. ICBO

2381. IC = aIE +____________?
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A. ICBO

B. ICEO

C. IB

D. IB

2382. At the base-emitter junctions of a transistor, one finds___________?
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A. a reverse bias

B. none of the above

C. a wide depletion layer

D. low resistance
2383. The arrow in the symbol of a transistor indicates the direction of____________?
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A. electron current in the emitter

B. electron current in the collector

C. hole current in the emitter

D. donor ion current

2384. Quartz crystal is most commonly used in crystal oscillators because:____________?
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A. None of the above

B. It is easily available

C. It is quite inexpensive

D. It has superior electrical properties
2385. The most commonly used transistor arrangement is____________arrangement?
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A. common base

B. none of the above

C. common collector

D. common emitter
2386. The piezoelectric effect in a crystal is___________?
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A. A change in resistance because of temperature

B. None of the above

C. A change in frequency because of temperature

D. A voltage developed because of mechanical stress
2387. The forward voltage drop across a silicon diode is about _______________?
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A. 2.5 V

B. 10 V

C. 3 V

D. 0.7 V
2388. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
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A. 25 ? & 16.7 %

B. 5 ? & 20 %

C. 5 ? & 16.7 %

D. 25 ? & 20 %
2389. A 10 V power supply would use ____________ as filter capacitor?
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A. air capacitor

B. mica capacitor

C. paper capacitor

D. electrolytic capacitor
2390. The gain of an amplifier with feedback is known as____________gain?
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A. Open loop

B. Resonant

C. Closed loop

D. None of the above

2391. The hfe parameter is called ______________in CE arrangement with output shorted?
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A. Current gain

B. Input impedance

C. Voltage gain

D. None of the above

2392. The most commonly used semiconductor in the manufacture of a transistor is_____________?
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A. silicon

B. germanium

C. carbon

D. none of the above

2393. The value of negative feedback fraction is always _______________?
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A. None of the above

B. More than 1

C. Less than 1

D. Equal to 1

2394. Induction heating process is based on which of the following principles ?
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A. Resistance heating principle

B. Thermal ion release principle

C. Nucleate heating principle

D. Electro-magnetic induction principle
2395. Which of the following heating methods has maximum power factor ?
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A. Induction heating

B. Dielectric heating

C. Resistance heating

D. Arc heating

2396. The voltage gain in a transistor connected in___________arrangement is the highest?
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A. common emitter

B. common collector

C. common base

D. none of the above

2397. There is a need of transformer for__________________?
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A. centre-tap full-wave rectifier

B. half-wave rectifier

C. none of the above

D. bridge full-wave rectifier

2398. There are ______________ h parameters of a transistor?
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A. Three

B. None of the above

C. Four

D. Two

2399. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?
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A. 31.25 mA

B. 135 mA

C. 60 mA

D. 15 mA

2400. In an LC transistor oscillator, the active device is___________?
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A. Biasing circuit

B. LC tank circuit

C. Transistor

D. None of the above