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
2201. The output impedance of a transistor connected in_____________arrangement is the highest?
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A. common base

B. common collector

C. common emitter

D. none of the above

2202. The size of the earth or ground wire is based on the______________?
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A. maximum fault current carrying through the ground wire

B. rated current carrying capacity of the service line

C. depends on the soil resistance

D. both (A) and (C)
2203. The output impedance of an emitter follower is______________?
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A. Almost zero

B. Low

C. Very high

D. High

2204. Six resistors are in parallel. The two lowest-value resistors are both 1.2 k?. The total resistance______________?
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A. is greater than 1.2 k?

B. is less than 600 ?

C. is less than 6 k?

D. is less than 1.2 k?

2205. If the doping level in a crystal diode is increased, the width of depletion layer_____________?
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A. in increased

B. none of the above

C. remains the same

D. is decreased

2206. In a tansistor, IC = 100 mA and IE = 100.2 mA. The value of is____________?
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A. about 1

B. 200

C. 100

D. 50

2207. For intermittent work which of the following furnaces is suitable ?
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A. Either of the above

B. None of the above

C. Core less furnace

D. Indirect arc furnace

2208. A 1,000 V power supply would use_____________ as a filter capacitor?
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A. paper capacitor

B. mica capacitor

C. electrolytic capacitor

D. air capacitor

2209. If voltage feedback (negative) is applied to an amplifier, its output impedance ______________?
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A. Remains the same

B. Is decreased

C. Is increased

D. None of the above

2210. A sudden increase in the total current into a parallel circuit may indicate______________?
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A. either a drop in source voltage or an open resistor

B. a drop in source voltage

C. an open resistor

D. an increase in source voltage
2211. When negative voltage feedback is applied to an amplifier, its voltage gain ____________?
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A. Is reduced

B. Remains the same

C. Is increased

D. None of the above

2212. A crystal diode is a ________________device?
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A. linear

B. none of the above

C. non-linear

D. bilateral

2213. The dimensions of hie parameter are _______________?
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A. Mho

B. Ohm

C. None of the above

D. Farad

2214. When the crystal current diode current is large, the bias is ______________?
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A. poor

B. inverse

C. reverse

D. forward
2215. For the transmission of heat from one body to another__________?
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A. temperature of the two bodies must be different

B. both bodies must be solids

C. both bodies must be in contact

D. at least one of the bodies must have some source of heating

2216. Induction furnaces are employed for which of the following ?
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A. None of the above

B. Heat treatment of castings

C. Melting aluminium

D. Heating of insulators

2217. A zener diode utilizes ______________ characteristics for its operation?
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A. forward

B. reverse

C. both forward and reverse

D. none of the above

2218. If the operating point changes, the h parameters of transistor_____________?
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A. Also change

B. Do not change

C. None of the above

D. May or may not change

2219. An oscillator converts __________?
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A. power into a.c. power

B. mechanical power into a.c. power

C. none of the above

D. power into d.c. power

2220. A zener diode is used as ______________?
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A. an amplifier

B. a multivibrator

C. a rectifier

D. a voltage regulator
2221. The d.c. resistance of a crystal diode is ______________ its a.c. resistance?
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A. less than

B. none of the above

C. more than

D. the same as

2222. The collector-base junction in a transistor has___________?
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A. forward bias at all times

B. none of the above

C. reverse bias at all times

D. low resistance

2223. An LC oscillator cannot be used to produce ____________frequencies?
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A. Audio

B. High

C. Very low

D. Very high

2224. The signal generator generally used in the laboratories is___________oscillator?
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A. Wien-bridge

B. Phase shift

C. Hartely

D. Crystal

2225. A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?
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A. 1000/7.07 KHz

B. 100KHz

C. 1000/17 KHz

D. 50 KHz

2226. In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?
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A. 02

B. 1

C. 10

D. 1

2227. A feedback circuit usually employs _________________ network?
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A. Resistive

B. Inductive

C. None of the above

D. Capacitive

2228. The following resistors are in parallel across a voltage source: 220? , 470? , and 560? . The resistor with the least current is______________?
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A. 560 ?

B. 470 ?

C. 220 ?

D. impossible to determine without knowing the voltage

2229. If the PIV rating of a diode is exceeded,_______________?
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A. none of the above

B. the diode conducts poorly

C. the diode is destroyed

D. the diode behaves like a zener diode

2230. In a pnp transistor, the current carriers are______________?
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A. free electrons

B. donor ions

C. acceptor ions

D. holes
2231. A zener diode has ________________?
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A. one pn junction

B. three pn junctions

C. none of the above

D. two pn junctions

2232. Radiant heating is used for which of the following ?
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A. Heating of liquids in electric kettle

B. Annealing of metals

C. Drying of paints and varnishes

D. Melting of ferrous metals

2233. In a transistor, the base current is about_________of emitter current?
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A. 25%

B. 5%

C. 35%

D. 20%

2234. Which of the following methods is used to control temperature in resistance furnaces ?
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A. Variation of resistance

B. All of the above methods

C. Variation of voltage

D. Periodical switching on and off of the supply

2235. method has leading power factor____________?
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A. Dielectric heating

B. Resistance heating

C. Induction heating

D. Arc heating

2236. For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?
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A. to provide low impedance

B. to discharge the charging capacitance to ground

C. protection for operating personnel

D. both (B) and (C)
2237. The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earths atmosphere is known as_______________?
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A. irradiation

B. viscous dissipation

C. radiation

D. ablation
2238. Emitter follower is used for________________?
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A. Voltage gain

B. Impedance matching

C. None of the above

D. Current gain

2239. The doping level in a zener diode is______________ that of a crystal diode?
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A. more than

B. the same as

C. none of the above

D. less than

2240. To prevent a DC return between source and load, it is necessary to use___________?
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A. inductor between source and load

B. resistor between source and load

C. capacitor between source and load

D. either A. or B.

2241. A second condition for oscillations is____________?
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A. No gain around the feedback loop

B. The attention of the feedback circuit must be one-third

C. A gain of 1 around the feedback loop

D. The feedback circuit must be capacitive

2242. A series resistance is connected in the zener circuit to_______________?
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A. protect the zener

B. none of the above

C. properly forward bias the zener

D. properly reverse bias the zener

2243. In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?
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A. the p-n junction

B. the edge of the depletion region on the n-side

C. the edge of the depletion region on the p-side

D. the center of the depletion region on the n-side

2244. A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high______________?
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A. Slew rate

B. CMMR

C. Bandwidth

D. Open-loop gain

2245. Which of the following has the highest value of thermal conductivity ?
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A. Water

B. Sold ice

C. Steam

D. Melting ice

2246. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately________________?
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A. 500

B. 5000

C. 100

D. 1000

2247. ____________is a fixed frequency oscillator?
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A. Colpitts oscillator

B. Phase-shift oscillator

C. Crystal oscillator

D. Hartely-oscillator

2248. The maximum efficiency of a half-wave rectifier is _____________?
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A. 40.6 %

B. 81.20%

C. 25%

D. 50%

2249. For radiant heating around 2250C, the heating elements are made of____________?
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A. tungsten alloy

B. stainless steel alloy

C. carbon

D. copper alloy

2250. Ajax Wyatt furnace is started when____________?
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A. none of the above

B. it is filled below core level

C. it is filled above core level

D. it is fully empty