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
4351. 1 db corresponds to_____________change in voltage or current level?
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A. 40%

B. 25%

C. 20%

D. 80%

4352. Transformer coupling is generally employed when load resistance is______________?
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A. None of the above

B. Small

C. Very large

D. Large

4353. _____________coupling provides the maximum voltage gain?
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A. Transformer

B. Direct

C. Impedance

D. RC

4354. The gain of an amplifier is expressed in db because_____________?
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A. Calculations become easy

B. It is a simple unit

C. None of the above

D. Human ear response is logarithmic
4355. The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is____________?
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A. 12.73 V peak-to-peak

B. zero

C. 18 V peak-to-peak

D. 9 V peak-to-peak

4356. A parallel resonant band-pass filter consists of a 6.8 ? resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 ?. What is the center frequency of the filter?
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A. 514 kHz

B. 5.03 MHz

C. 503 kHz

D. 5.14 MHz
4357. In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
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A. 3.5 kHz

B. 7 kHz

C. 0 Hz to 3.5 kHz

D. 0 Hz

4358. In a certain low-pass filter, fc = 3.5 kHz. Its passband is____________?
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A. 7 kHz

B. 0 Hz

C. 0 Hz to 3.5 kHz

D. 3.5 kHz

4359. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency_____________?
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A. is 7 kHz

B. cannot be determined

C. is 10 kHz

D. is 12 kHz
4360. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V.the filters bandwidth is____________?
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A. 11.5 Hz

B. 53 Hz

C. 530 Hz

D. 106 Hz

4361. An RC high-pass filter consists of a 0.2 F capacitor and a 220 ? resistor. The output is taken across the resistor. The circuits critical frequency is_____________?
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A. 7,234 Hz

B. 723 Hz

C. 362 Hz

D. 3,617 Hz
4362. An RL high-pass filter consists of a 470 ? resistor and a 600 mH coil. The output is taken across the coil. The circuits critical frequency is___________?
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A. 1,250 Hz

B. 5,644 Hz

C. 125 Hz

D. 564 Hz

4363. A series resonant band-stop filter consists of a 68 ? resistor, a 110 mH coil, and a 0.02 F capacitor. The internal resistance, RW, of the coil is 4 ?. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?
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A. 200 mV

B. 111 mV

C. 11.1 mV

D. 1.1 mV

4364. In a certain low-pass filter, fc = 3.5 kHz.if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
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A. 597 mV

B. 6 V

C. 5.97 V

D. 0 V

4365. An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k? resistor. The output voltage is taken across the resistor. The circuits critical frequency is______________?
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A. 86.12 kHz

B. 93.8 Hz

C. 93.8 kHz

D. 861 Hz

4366. In a series resonant band-pass filter, a lower value of Q results in______________?
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A. a higher resonant frequency

B. a smaller bandwidth

C. a higher impedance

D. a larger bandwidth
4367. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?
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A. 15 V

B. 21.21 V

C. 0 V

D. 10.60 V
4368. An RC high-pass filter consists of an 820 ? resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?
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A. 161 F

B. 220 F

C. 0.161 F

D. 81 F

4369. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is_____________?
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A. 6.02 dB

B. 12.04 dB

C. -12.04 dB

D. -6.02 dB
4370. An RC low-pass filter consists of a 120 ? resistor and a 0.002 F capacitor. The output is taken across the capacitor. The circuits critical frequency is___________?
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A. 60 kHz

B. 333 kHz

C. 633 kHz

D. 331 kHz

4371. Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is__________?
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A. -8.30 dB

B. 0 dB

C. 0.8 dB

D. 8.30 dB

4372. A parallel resonant band-pass filter consists of a 90 ? resistor in series with a parallel network made up of a 60 mH coil and a 0.02 F capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 ?. What is the center frequency of the filter?
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A. 459 Hz

B. 999 Hz

C. 4,591 Hz

D. 2,176 Hz

4373. A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is____________?
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A. 18 V peak-to-peak

B. 9 V peak-to-peak

C. zero

D. 12.74 V peak-to-peak

4374. In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
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A. 5.97 V

B. 597 mV

C. 0 V

D. 6 V

4375. A series resonant band-pass filter consists of a 2 mH coil, a 0.005 F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
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A. 12 V

B. 10.9 V

C. 1.09 V

D. 1.1 V

4376. In Thevenins theorem, to find Z
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A. all independent voltage and current sources are short circuited

B. all independent voltage sources are short circuited and all independent current sources are open circuited

C. all independent voltage sources are open circuited and all independent current sources are short circuited

D. all independent current sources are short circuited and independent voltage sources are open circuited

4377. A closed path made by several branches of the network is known as____________?
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A. branch

B. junction

C. loop

D. circuit

4378. A capacitor is generally a____________?
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A. linear and bilateral component

B. bilateral and active component

C. non-linear and active component

D. active, passive, linear and nonlinear component

4379. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be___________?
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A. a voltage source

B. a current source

C. both of above

D. none of the above

4380. Which of the following is a bilateral element?
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A. Constant current source

B. Capacitance

C. None of the above

D. Constant voltage source

4381. The circuit whose properties are same in either direction is known as__________?
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A. reversible circuit

B. unilateral circuit

C. irreversible circuit

D. bilateral circuit
4382. Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load. The above statement is associated with____________?
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A. Thevenins theorem

B. Maximum power transfer theorem

C. Millmans theorem

D. Superposition theorem

4383. A non-linear network does not satisfy__________?
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A. superposition condition

B. homogeneity condition

C. both homogeneity as well as superposition condition

D. homogeneity, superposition and associative condition

4384. Kirchhoff s current law states that
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A. total sum of currents meeting at the junction is zero

B. net current flow at the junction is positive

C. no current can leave the junction without some current entering it.

D. Hebraic sum of the currents meeting at the junction is zero
4385. In a series parallel circuit, any two resistances in the same current path must be in___________?
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A. parallel with each other

B. series with the voltage source

C. parallel with the voltage source

D. series with each other
4386. Application of Nortons theorem to a circuit yields:________________?
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A. equivalent current source and impedance in parallel

B. equivalent current source and impedance in series

C. equivalent impedance

D. equivalent current source

4387. An ideal voltage source has__________?
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A. terminal voltage in proportion to current

B. zero internal resistance

C. open circuit voltage equal to the voltage on full load

D. terminal voltage in proportion to load

4388. Kirchhoff s voltage law applies to circuits with____________?
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A. linear, non-linear, active and passive elements

B. linear elements only

C. nonlinear elements only

D. linear, non-linear, active, passive, time varying as wells as time-in-variant elements
4389. Choose the incorrect statement: A branch formed by the parallel connection
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A. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

B. A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

C. A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

D. A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

4390. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is____________?
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A. 30 Q

B. 40 Q

C. 20 Q

D. 10 Q

4391. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always____________?
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A. zero

B. determined by battery e.m.fs.

C. negative

D. positive

4392. Kirchhoff s law is applicable to____________?
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A. passive networks only

B. a.c. circuits only

C. d.c. circuits only

D. both a.c. as well d.c. circuits
4393. An ideal voltage source should have______________?
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A. small value of e.m.f.

B. zero source resistance

C. infinite source resistance

D. large value of e.m.f.

4394. For high efficiency of transfer of power, internal resistance of the source should be____________?
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A. less than the load resistance

B. more than the load resistance

C. none of the above

D. equal to the load resistance

4395. Between the branch voltages of a loop the Kirchhoff s voltage law imposes_____________?
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A. none of the above

B. linear constraints

C. non-linear constraints

D. no constraints

4396. While calculating Rth in Thevenins theorem and Norton equivalent
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A. only voltage sources are made dead

B. all voltage and current sources are made dead

C. only current sources are made dead

D. all independent sources are made dead
4397. For a voltage source:
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A. None

B. terminal voltage is always lower than source e.m.f.

C. terminal voltage cannot be higher than source e.m.f.

D. the source e.m.f. and terminal voltage are equal

4398. The superposition theorem requires as many circuits to be solved as there are____________?
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A. sources, nodes and meshes

B. sources and nodes

C. sources

D. nodes

4399. The superposition theorem is applicable to____________?
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A. linear responses only

B. none of the above

C. linear, non-linear and time variant responses

D. linear and non-linear resistors only

4400. In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch.
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A. above statement is associated with

B. compensation theorem

C. reciprocity theorem

D. none of the above

E. superposition theorem