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
2251. When an additional resistor is connected across an existing parallel circuit, the total resistance____________?
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A. remains the same

B. decreases by the value of the added resistor

C. decreases

D. increases by the value of the added resistor

2252. The h parameter approach gives correct results for_______________?
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A. Large signals only

B. Small signals only

C. Both small and large signals

D. None of the above

2253. In a phase shift oscillator, we use____________RC sections?
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A. Four

B. Two

C. None of the above

D. Three
2254. When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?
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A. passive

B. active

C. linear

D. nonlinear

2255. Heat transfer by condition will not occur when____________?
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A. temperatures of the two bodies are identical

B. bodies are kept in vacuum

C. bodies are immersed in water

D. bodies are exposed to thermal radiations

2256. An oscillator differs from an amplifier because it_____________?
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A. Requires no d.c. supply

B. Always has the same input

C. Requires no input signal

D. Has more gain

2257. The most widely used rectifier is ________________?
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A. half-wave rectifier

B. bridge full-wave rectifier

C. none of the above

D. centre-tap full-wave rectifier

2258. The knee voltage of a crystal diode is approximately equal to ________________?
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A. forward voltage

B. applied voltage

C. breakdown voltage

D. barrier potential
2259. When a body reflects entire radiation incident on it, then it is known as____________?
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A. transparent body

B. black body

C. white body

D. grey body

2260. The element that has the biggest size in a transistor is____________?
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A. collector

B. base

C. emitter

D. collector-base-junction

2261. In arc furnace the function of choke is______________?
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A. to stabilize the arc

B. to imprpve, power factor

C. none of the above

D. to reduce severity of the surge

2262. An ammeter has an internal resistance of 50 ?. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately___________?
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A. 55 ?

B. 9 ?

C. 5.5 ?

D. 50 ?

2263. The current gain of a BJT is__________?
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A. gm r0

B. gm /r?

C. gm r?

D. gm / r0

2264. When voltage feedback (negative) is applied to an amplifier, its input impedance _______________?
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A. None of the above

B. Is increased

C. Remains the same

D. Is decreased

2265. For the same secondary voltage, the output voltage from a centre-tap rectifier is___________ than that of bridge rectifier?
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A. thrice

B. four time

C. twice

D. one-half
2266. For heating element high resistivity material is chosen to______________?
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A. reduce the length of heating element

B. reduce the effect of oxidation

C. increase the life of the heating element

D. produce large amount of heat

2267. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?
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A. 1

B. 0

C. 2

D. 2-Jan

2268. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
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A. 50dB

B. 23dB

C. 46dB

D. 25dB

2269. In heating the ferromagnetic material by induction heating, heat is produced due to_____________?
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A. none of the above factors

B. induced current flow through the charge

C. due to hysteresis loss as well as eddy current loss takingplace in the charge

D. hysteresis loss taking place below curie temperature

2270. Average resistance of human body is____________?
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A. 2000 ohms

B. 1000 ohms

C. 1500 ohms

D. 500 ohms

2271. The parameter hie stands for input impedance in _____________?
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A. CE arrangement with output shorted

B. CB arrangement with output shorted

C. None of the above

D. CC arrangement with output shorted

2272. If one of the resistors in a parallel circuit is removed, the total resistance_____________?
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A. decreases

B. doubles

C. remains the same

D. increases
2273. The bandwidth of an RF tuned amplifier is dependent on____________?
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A. Q factor of the tuned o/p circuit

B. Q factor of the tuned i/p circuit

C. Q-factor of the o/p and i/p circuits as well as quiescent operating point

D. Quiescent operating point

2274. A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately___________?
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A. 61 mA

B. 110 mA

C. 610 mA

D. 18 mA

2275. An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?
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A. 5 volts

B. 5/ volts

C. 10 volts

D. 5/2 volts
2276. Four 8 ? speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?
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A. 1.5 W

B. 18 W

C. 48 W

D. 72 W
2277. A transistor behaves as a linear device for _____________?
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A. Small signals only

B. Large signals only

C. Both small and large signals

D. None of the above

2278. In Colpitts oscillator, feedback is obtained___________?
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A. By a tickler coil

B. None of the above

C. From the centre of split capacitors

D. A. By magnetic induction

2279. ____________ rectifier has the lowest forward resistance?
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A. none of the above

B. solid state

C. gas tube

D. vacuum tube

2280. A zener diode is________________ device?
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A. an amplifying

B. none of the above

C. a non-linear

D. a linear

2281. A change in the value of the emitter resistance Re in a differential amplifier?
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A. affects the difference mode gain Ad

B. affects the common mode gain Ac

C. ffects both Ad and Ac

D. does not effect either Ad and Ac

2282. A non-dimensional number generally associated with natural convection heat transfer is____________?
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A. Pecelet number

B. Nusselt number

C. Grashoff number

D. Prandtl number

2283. Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?
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A. 2.2 A

B. 1.8 A

C. 9.09 A

D. 137 mA

2284. Six resistors are in parallel. The two lowest-value resistors are both 1.2 k?. The total resistance_____________?
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A. is less than 6 k?

B. is less than 1.2 k?

C. is less than 600 ?

D. is greater than 1.2 k?

2285. IC = [a / (1 a )] IB + [___________ / (1 a )?
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A. ICBO

B. IE

C. ICEO

D. IC

2286. Emitter follower is a _______________circuit?
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A. Voltage feedback

B. Current feedback

C. Both voltage and current feedback

D. None of the above

2287. Emitter follower is used for ________________?
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A. Impedance matching

B. Voltage gain

C. None of the above

D. Current gain

2288. BC 147 transistor indicates that it is made of____________?
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A. carbon

B. silicon

C. none of the above

D. germanium

2289. When a 1.6 k? resistor and a 120? resistor are connected in parallel, the total resistance is____________?
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A. greater than 120 but less than 1.6 k?

B. greater than 1.6 k?

C. less than 120 but greater than 100 ?

D. less than 100 ?

2290. When a crystal diode is used as a rectifier, the most important consideration is ____________?
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A. doping level

B. forward characteristic

C. reverse characteristic

D. PIC rating
2291. If the a.c. input to a half-wave rectifier is an r.m.s value of 400/?2 volts, then diode PIV rating is__________________?
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A. none of the above

B. 400 x ?2 V

C. 400 V

D. 400/?2 V

2292. A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will____________?
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A. decrease

B. none of the above

C. remain the same

D. increase

2293. Which of the following is not associated with a p-n junction?
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A. junction capacitance

B. depletion capacitance

C. charge storage capacitance

D. channel length modulation
2294. The input impedance of a transistor is___________?
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A. high

B. very high

C. almost zero

D. low
2295. The Q of the crystal is of the order of____________?
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A. 50

B. More than 10,000

C. 100

D. 1000

2296. In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is_______________?
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A. 3 mA

B. 12:00 AM

C. 12 mA

D. 48 mA

2297. The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode
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A. none of the above

B. more than

C. the same as

D. lower than
2298. If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?
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A. 15

B. 10

C. 1

D. 01
2299. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is_____________?
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A. the larger of the two

B. 7 A

C. unknown

D. 1:00 AM

2300. A 470 ? resistor, a 220 ? resistor, and a 100 ? resistor are all in parallel. The total resistance is approximately________________?
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A. 60 ?

B. 30 ?

C. 470 ?

D. 790 ?