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
3501. 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 higher impedance

C. a smaller bandwidth

D. a larger bandwidth
3502. ________________ coupling is generally employed in power amplifiers?
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A. Transformer

B. direct

C. Impedance

D. RC

3503. The practical illustration of the phenomenon of mutual induction is____________?
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A. D.C dynamo

B. transformer

C. induction coil

D. A.C generator

3504. A 2-transistor class B power amplifier is commonly called ______________ amplifier?
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A. Differential

B. Symmetrical

C. Push-pull

D. Dual

3505. The ear is not sensitive to___________?
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A. Frequency distortion

B. Amplitude distortion

C. e of the above

D. Frequency as well as amplitude distortion

3506. In transistor amplifiers, we generally use______________ capacitors?
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A. Mica

B. Paper

C. Electrolytic

D. Air

3507. The value of collector load RC in a transistor amplifier is _______________the output impedance of the transistor?
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A. Less than

B. The same as

C. More than

D. None of the above

3508. The push-pull circuit must use ______________ operation?
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A. Class C

B. Class AB

C. Class B

D. Class A

3509. 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. 333 kHz

B. 331 kHz

C. 60 kHz

D. 633 kHz
3510. Low efficiency of a power amplifier results in_________________?
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A. More battery consumption

B. Low forward bias

C. None of the above

D. Less battery consumption

3511. A gain of 1000 times in voltage is expressed by_______________?
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A. 120 db

B. 60 db

C. 30 db

D. 600 db

3512. In a certain five-step R/2R ladder network, the smallest resistor value is 1 k?. The largest value is___________?
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A. 10 k?

B. Indeterminable

C. 2 k?

D. 20 k?

3513. The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8C. If the spheres are connected by a copper wire_______________?
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A. charge will flow from A to B

B. charge will flow from B to A

C. no flow of charge will occur

D. both a and b are possible

3514. RC coupling is generally confined to low power applications because of____________?
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A. Large value of coupling capacitor

B. None of the above

C. Low efficiency

D. Large number of components

3515. An electric field can deflect_______________?
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A. Neutrons

B. X-rays

C. Both glass rod and silk acquire a negative charge

D. None
3516. When we rub a glass rod with a silk cloth then________________?
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A. glass rod acquires negative charge while silk acquires positive charge

B. glass rod acquires positive charge while silk acquires negative charges

C. both glass rod and silk acquire negative charge

D. both glass rod and silk acquire positive charge

3517. The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
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A. Collector supply VCC

B. None of the above

C. Biasing circuit

D. Transistor

3518. A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil ?
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A. ?B(r22-r12)/?t

B. ?B(r2-r1)2/?t

C. ?B/r22-r12/?t

D. ?B(r22+r12)/?t

3519. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?
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A. 20%

B. 50%

C. 40%

D. 80%

3520. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?
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A. 14 db

B. 24 db

C. 600 db

D. 27 db
3521. The output transformer used in a power amplifier is a _____________ transformer?
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A. Step-up

B. None of the above

C. 1:1 ratio

D. Step-down
3522. 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. -12.04 dB

B. -6.02 dB

C. 12.04 dB

D. 6.02 dB

3523. The purpose of a coupling capacitor in a transistor amplifier is to ___________________?
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A. Pass a.c. and block d.c.

B. Protect the transistor

C. Increase the output impedance of transistor

D. Provide biasing

3524. The pulsating d.c. applied to power amplifier causes________________?
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A. Burning of transistor

B. Excessive forward voltage

C. Hum in the circuit

D. None of the above

3525. A certain voltage divider consists of three 1 k? resistors in series. Which of the following load resistors will have the least effect on the output voltage?
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A. 1 M?

B. 330 ?

C. 100 k?

D. 1 k?

3526. The phase difference between the output and input voltages of a CE amplifier is _____________?
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A. 90o

B. 180o

C. 0o

D. 270o

3527. _____________coupling provides the maximum voltage gain?
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A. Transformer

B. Impedance

C. RC

D. Direct

3528. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
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A. 1/4th of its original value

B. 1/8th of its original value

C. 4 times of its original value

D. 8 times of its original value

3529. If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?
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A. 5 k?

B. 10 k?

C. 20 k?

D. 2 k?

3530. The first goal to accomplish in analyzing a complex series-parallel circuit is to____________?
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A. solve for the total current and resistance

B. equate all parallel components

C. solve for all the voltage drops

D. equate all series components

3531. If mica sheet is placed between the plates of a capacitor the capacity_______________?
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A. increases then decreases

B. decreases then increases

C. increases

D. decreases

3532. Inductors acts as a short circuit for_______________?
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A. AC

B. DC

C. Both A and B

D. none of these

3533. The size of a power transistor is made considerably large to________________?
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A. Facilitate connections

B. Provide easy handling

C. Dissipate heat

D. None of the above

3534. A CE amplifier is also called _______________ circuit?
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A. None of the above

B. Grounded emitter

C. Grounded base

D. Grounded collector

3535. The force per unit charge is know as__________________?
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A. electric flux

B. all of above are same

C. electric potential

D. electric intensity
3536. Long distance transmission is easy for________________?
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A. A.C voltage

B. Half D.C voltage

C. Half A.C voltage

D. D.C voltage

3537. The number of electrons in one coulomb charge is equal to_______________?
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A. 1.6 x 1019

B. 6.2 x 1021

C. 6.2 x 1018

D. 1.6 x 10-27

3538. An alternating current or voltage________________?
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A. changes its direction again and again

B. fluctuates off and on

C. varies in magnitude alone

D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.
3539. The emf induced in a coil by a changing magnetic flux may have unit as______________?
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A. kgms2A-1

B. kgm2s-1A-1

C. ms-1A

D. ms-2A-1

3540. The maximum efficiency of resistance loaded class A power amplifier is _________________?
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A. 50%

B. 5%

C. 30%

D. 25%
3541. Class_____________ power amplifier has the highest collector efficiency ?
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A. B

B. A

C. C

D. AB

3542. 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. 81 F

C. 220 F

D. 0.161 F
3543. Equivalent capacitance is greater than individual capacitances in_____________?
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A. series combination

B. parallel combination

C. both series and parallel combinations

D. none of above

3544. If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?
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A. Spiral path

B. Circular path

C. Curved path

D. Straight line
3545. CC configuration is used for impedance matching because its ________________?
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A. Input impedance is very high

B. Output impedance is very low

C. Input impedance is low

D. None of the above

3546. A gain of 1,000,000 times in power is expressed by_____________?
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A. 120 db

B. 600 db

C. 30 db

D. 60 db
3547. An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 410-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
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A. 38.4msec-1

B. 384msec-1

C. 150msec-1

D. 200msec-1

3548. The driver stage usually employs_________________?
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A. Push-pull amplifier

B. None of the above

C. Class C amplifier

D. Class A power amplifier
3549. RC coupling is used for_____________amplification?
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A. Current

B. None of the above

C. Voltage

D. Power

3550. A.C can not be used for_______________?
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A. producing light

B. Magnetizing iron

C. producing heat

D. Producing magnetic field