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
3851. An ideal OP-AMP is an ideal___________?
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A. voltage controlled current source

B. Current controlled Current source

C. Current controlled voltage source

D. Voltage controlled voltage source

3852. Which of the following is not associated with a p-n junction?
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A. junction capacitance

B. depletion capacitance

C. channel length modulation

D. charge storage capacitance

3853. Thermal runaway is not possible in FET because as the temperature of FET increases_________________?
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A. the transconductance increases

B. the drain current increases

C. the mobility decreases

D. none of the above

3854. A bistable multivibrator has _________________?
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A. Two stable states

B. None of the above

C. No stable state

D. One stable state

3855. One would find a clamping circuit in ___________________?
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A. Receiving antenna

B. Television receiver

C. Radio receiver

D. Radio transmitter

3856. The multivibrator which generates square wave of its own is the ____________multivibrator?
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A. Monostable

B. None of the above

C. Astable

D. Bistable

3857. If a square wave is fed to a differentiating circuit, the output will be _____________?
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A. Sharp narrow pulses

B. Triangular wave

C. Rectangular wave

D. Sine wave

3858. The main disadvantage of a mechanical switch is that it_______________?
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A. Is operated mechanically

B. None of the above

C. Has high inertia

D. Is costly

3859. A relay is ___________switch?
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A. A mechanical

B. An electronic

C. An electromechanical

D. None of the above

3860. The most inexpensive switch is _____________ switch?
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A. Electronic

B. Electromechanical

C. None of the above

D. Mechanical

3861. The switch that has the fastest speed of operation is ____________ switch?
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A. Electronic

B. Electromechanical

C. Mechanical

D. None of the above

3862. When a transistor is used as an amplifier, it is operated in the _____________ region?
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A. None of the above

B. Saturation

C. Off

D. Active
3863. When a transistor is driven to saturation, ideally the output is _____________?
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A. 2VCC

B. 0

C. VCC

D. VCC/2

3864. ______________ multivibrator is a square wave oscillator?
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A. Monostable

B. Astable

C. Bistable

D. None of the above

3865. A relay is superior to a mechanical switch because it _______________?
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A. Is relatively inexpensive

B. Combines control with power amplification

C. None of the above

D. Does not require moving contacts

3866. When a transistor is driven to cut off, ideally the output is _______________?
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A. 0

B. VCC/3

C. VCC

D. VCC/2

3867. When the transistor (CE arrangement) is in the cut off region, the collector current is ______________?
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A. ICBO

B. ( + 1) ICEO

C. IC(sat)

D. ICEO
3868. For an integrating circuit to be effective , the RC product should be____________ the time period of the input wave?
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A. 5 times smaller than

B. At least 10 times greater than

C. 5 times greater than

D. Equal to

3869. For a differentiating circuit to be effective, the RC product should be ___________ the time period of the input wave?
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A. 5 times greater than

B. At least 10 times greater than

C. 5 times smaller than

D. Equal to

3870. A monostable vibrator has_____________
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A. None of the above

B. Two stable states

C. One stable state

D. No stable state

3871. When a rectangular voltage waveform is applied to a capacitor, then the current waveform is ______________?
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A. Rectangular

B. Sinusoidal

C. Sawtooth

D. Square

3872. A differentiating circuit is a simple RC circuit with output taken across ____________?
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A. R

B. C

C. Both R and C

D. None of the above

3873. An astable multivibrator has ________________?
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A. No stable state

B. One stable state

C. Two stable states

D. None of the above

3874. An integrating circuit is a simple RC series circuit with output taken across ______________?
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A. Both R and C

B. R

C. C

D. None of the above

3875. If the input to a differentiating circuit is a saw-tooth wave, then output will be _____________?
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A. Triangular

B. Square

C. Sine

D. Rectangular
3876. If d.c. supply of 10 V is fed to a differentiating circuit, then output will be_______________?
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A. 0 V

B. 20 V

C. 10 V

D. None of the above

3877. If the input to an integrating circuit is a succession of alternating positive and negative pulses of very short duration, the output will be _____________wave A?
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A. ectangular

B. Sine

C. Triangular

D. Square
3878. The positive clipper is that which removes the ____________half-cycles of the input voltage?
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A. Negative

B. Positive

C. Both positive and negative

D. None of the above

3879. A switch has ______________?
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A. Two states

B. Three states

C. One state

D. None of the above

3880. In a multivibrator, we have___________ feedback?
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A. Negative

B. 100 % positive

C. Both positive and negative

D. None of the above

3881. A negative clipper removes the ______________half-cycles of the input voltage?
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A. Negative

B. Positive

C. Both positive and negative

D. None of the above

3882. The maximum speed of electronic switch can be _____________operations per second?
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A. 10

B. 1000

C. 104

D. 109
3883. 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____________?
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A. 540 mA

B. 200 mA

C. 900 mA

D. 1.24 A
3884. 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____________?
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A. R3 is open

B. the circuit is operating properly

C. R1 is open

D. R2 is open

3885. 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. 18 mA

C. 110 mA

D. 610 mA

3886. 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. 50 ?

B. 55 ?

C. 9 ?

D. 5.5 ?
3887. 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. an open resistor

C. an increase in source voltage

D. a drop in source voltage

3888. When a 1.6 k? resistor and a 120? resistor are connected in parallel, the total resistance is____________?
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A. less than 100 ?

B. greater than 1.6 k?

C. less than 120 but greater than 100 ?

D. greater than 120 but less than 1.6 k?

3889. 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 brighter

B. the remaining two will glow dimmer

C. the remaining two will not light

D. the remaining two will glow with the same brightness as before
3890. 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. 135 mA

B. 15 mA

C. 60 mA

D. 31.25 mA
3891. 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. 12.5 ?

B. 50 ?

C. 20 K?

D. 200 ?

3892. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________________?
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A. 4.8 W

B. 12 W

C. 0.3 W

D. 1.2 W

3893. 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. 72 W

B. 1.5 W

C. 18 W

D. 48 W

3894. Five 100 ? resistors are connected in parallel. If one resistor is removed, the total resistance is______________?
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A. 20 ?

B. 100 ?

C. 500 ?

D. 25 ?
3895. 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 mA

C. 12:00 AM

D. 48 mA

3896. 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 600 ?

B. is greater than 1.2 k?

C. is less than 6 k?

D. is less than 1.2 k?

3897. Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 ?, the current through each parallel resistor is____________?
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A. 6.25 mA

B. 25 mA

C. 100 mA

D. 200 mA

3898. 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. 310 mA

B. 800 mA

C. 490 mA

D. 12:00 AM

3899. A 470 ? resistor, a 220 ? resistor, and a 100 ? resistor are all in parallel. The total resistance is approximately________________?
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A. 790 ?

B. 470 ?

C. 30 ?

D. 60 ?
3900. 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. 120 mA

B. 220 mA

C. 50 mA

D. 22 mA