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
2401. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______________?
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A. 1000:01:00

B. 40,000 : 1

C. 100:01:00

D. 1:01

2402. An emitter follower has ______________input impedance?
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A. Zero

B. None of the above

C. Low

D. High
2403. The total resistance of a parallel circuit is 50 ?. If the total current is 120 mA, the current through the 270 ? that makes up part of the parallel circuit is approximately_______________?
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A. 50 mA

B. 22 mA

C. 220 mA

D. 120 mA

2404. If the value of a is 0.9, then value of is___________?
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A. 9

B. 0.9

C. 90

D. 900

2405. When a negative voltage feedback is applied to an amplifier, its bandwidth_____________?
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A. Is increased

B. Is decreased

C. Remains the same

D. Insufficient data

2406. In a phase shift oscillator, the frequency determining elements are _______________?
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A. None of the above

B. L and C

C. R and C

D. R, L and C

2407. The temperature inside a furnace is usually measured by which of the following ?
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A. Mercury thermometer

B. Any of the above

C. Optical pyrometer

D. Alcohol thermometer

2408. The material of the heating element for a furnace should have___________?
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A. high specific resistance

B. lower melting point

C. all of the above

D. higher temperature coefficient

2409. Hysteresis loss and eddy current loss are used in____________?
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A. induction heating of brass

B. dielectric heating

C. induction heating of steel

D. resistance heating

2410. Which of the following devices is necessarily required for automatic temperature control in a furnace ?
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A. Thermocouple

B. Heating elements of variable resis-tance material

C. Thermostat

D. Auto-transformer

2411. The voltage gain of an emitter follower is _____________?
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A. Approximately equal to 1

B. None of the above

C. Greater than 1

D. Much less than 1

2412. An oscillator produces___________oscillations?
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A. Modulated

B. Damped

C. None of the above

D. Undamped
2413. When earth fault occurs______________?
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A. voltage potential at the earth mat decreases due to grounding

B. voltage potential at the earth mat remains zero irrespective of fault

C. voltage potential at the earth mat increases due to grounding

D. none of the above

2414. Generally grounding is provided for
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A. only for the safety of the equipment

B. only for the safety of the operating personnel

C. both (A) and (B)

D. none of the above

2415. In a transistor if = 100 and collector current is 10 mA, then IE is___________?
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A. 100 mA

B. 110 mA

C. 100.1 mA

D. none of the above

2416. A heat sink is generally used with a transistor to______________?
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A. decrease the forward current

B. increase the forward current

C. prevent excessive temperature rise

D. compensate for excessive doping

2417. Three lights are connected in parallel across a 120 volt source. If one light burns out_____________?
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A. the remaining two will glow dimmer

B. the remaining two will glow with the same brightness as before

C. the remaining two will not light

D. the remaining two will glow brighter

2418. The PIV rating of each diode in a bridge rectifier is ___________that of the equivalent center-tap rectifier?
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A. one-half

B. four times

C. the same as

D. twice

2419. Five 100 ? resistors are connected in parallel. If one resistor is removed, the total resistance is______________?
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A. 25 ?

B. 500 ?

C. 100 ?

D. 20 ?

2420. Induction heating takes place it which of the following ?
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A. Insulating materials

B. Conducting materials which are non-magnetic

C. Conducting materials which are magnetic

D. Conducting materials which may or may not be magnetic
2421. Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
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A. Sine wave

B. Square wave

C. Parabolic wave

D. Triangular wave

2422. The voltage gain of a transistor connected in common collector arrangement is____________?
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A. more than 10

B. less than 1

C. equal to 1

D. more than 100

2423. Which of the following methods of heating is not dependent on the frequency of supply ?
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A. Dielectric heating

B. All of the above

C. Induction heating

D. Electric resistance heating
2424. Voltage Series feedback also called series-shunt feedback) results in__________?
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A. Increase in both input & output impedances

B. Decreases in both input & output impedances

C. Increase in input impedance & decreases in output impedance

D. Decrease in input impedance & increase in output impedance

2425. Heat is transferred simultaneously by condition, convection and radiation_____________?
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A. inside boiler furnaces

B. through the surface of the insulted pipe carrying steam

C. from refrigerator coils to freezer of a refrigerator

D. during melting of ice

2426. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?
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A. 200 ?

B. 50 ?

C. 12.5 ?

D. 20 K?
2427. The objective of earthing or grounding is_______________?
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A. to provide as low resistance possible to the ground

B. to provide as high resistance possible to the ground

C. to provide flow of positive, negative and zero sequence currents

D. none of the above

2428. The application where one would most likely find a crystal oscillator is____________?
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A. None of the above

B. Radio receiver

C. Radio transmitter

D. AF sweep generator

2429. In the indirect resistance heating method, maximum heat-transfer takes place by____________?
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A. radiation

B. convection

C. any of the above

D. conduction</strong>

2430. The leakage current in a crystal diode is due to _________________?
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A. junction capacitance

B. none of the above

C. minority carriers

D. majority carriers

2431. Which of the following is an advantage of eddy current heating ?
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A. The area of the surface over which heat is produced can be accurately controlled

B. The amount of heat generated can be controlled accurately

C. Heat at very high rate can be gene-rated

D. All of the above
2432. In direct arc furnace, which of the following has high value ?
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A. All of the above

B. Power factor

C. Voltage

D. Current
2433. In the breakdown region, a zener didoe behaves like a _______________source?
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A. constant current

B. none of the above

C. constant resistance

D. constant voltage
2434. The electrode of a direct arc furnace is made of____________?
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A. tungsten

B. silver

C. copper

D. graphite
2435. When current feedback (negative) is applied to an amplifier, its output impedance ________________?
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A. Is increased

B. Is decreased

C. Remains the same

D. None of the above

2436. In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?
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A. Decreased 2 times

B. Increased 4 times

C. Decreased 4 times

D. Increased 2 times

2437. Which of the following insulating materials was suitable for low temperature applications ?
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A. Diatomaceous earth

B. 80 percent magnesia

C. Cork

D. Asbestos paper

2438. A Wien bridge oscillator uses___________feedback?
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A. Only positive

B. Only negative

C. Both positive and negative

D. None of the above

2439. The value of a of a transistor is_____________?
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A. more than 1

B. 1

C. less than 1

D. none of the above

2440. By which of the following methods the temperature inside arc nace can be varied ?
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A. By any of the above method

B. By varying the operating voltage

C. By disconnecting some of the heating elements

D. By varying the current through heating elements

2441. It is desirable to operate the arc furnaces at power factor of_____________?
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A. zero

B. 0.707 lagging

C. 0.707 leading

D. unity

2442. If the temperature of a crystal diode increases, then leakage current ______________?
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A. remains the same

B. increases

C. becomes zero

D. decreases

2443. When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________?
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A. Decreases

B. Remains unaffected

C. Increases
2444. The collector of a transistor is____________doped?
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A. heavily

B. none of the above

C. lightly

D. moderately
2445. A transistor is a___________operated device?
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A. current

B. voltage

C. both voltage and current

D. none of the above

2446. For an oscillator to properly start, the gain around the feedback loop must initially be_________?
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A. Equal to attenuation of feedback circuit

B. Less than 1

C. 1

D. Greater than 1
2447. In a transistor leakage current mainly depends on__________?
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A. temperature

B. doping of base

C. size of emitter

D. rating of transistor

2448. A source follower using an FET usually has a voltage gain which is___________?
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A. about -10

B. greater than +100

C. exactly unity but negative

D. slightly less than unity but positive

2449. Double tuned circuits are used in ____________ stages of a radio receiver?
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A. Output

B. IF

C. Audio

D. None of the above

2450. The Q of a tuned circuit refers to the property of_______________?
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A. Fidelity

B. Sensitivity

C. Selectivity

D. None of the above