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
3451. An electric charge at rest produces_______________?
comments icon0

A. only a magnetic field

B. only an electric field

C. neither electric field nor magnetic field

D. both electric and magnetic fields

3452. The gain of an amplifier is expressed in db because_____________?
comments icon0
A. Human ear response is logarithmic

B. Calculations become easy

C. None of the above

D. It is a simple unit

3453. When a transistor amplifier is operating, the current in any branch is _______________?
comments icon0

A. c. only

B. Sum of a.c. and d.c.

C. difference of a.c. and d.c.

D. c. only

3454. Weber is the unit of_____________?
comments icon0

A. Magnetic field intensity

B. magnetic induction

C. self-inductance

D. magnetic flux
3455. A balanced Wheatstone bridge consists of an RV of 3,500 ?, an R2 of 200 ?, and an R3 of 680 ?. The value of RUNK is____________?
comments icon0

A. 200 ?

B. 680 ?

C. 1,029 ?

D. 880 ?

3456. Self-inductance of a long solenoid is______________?
comments icon0

A. ?oN2

B. BA

C. ?oN2A

D. ?oN2/A

3457. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
comments icon0

A. 8 W

B. None of the above

C. 10 W

D. 4 W
3458. Energy stored in a magnetic field is given by______________?
comments icon0

A. L2I/2

B. IL2

C. LI2/2

D. LI2

3459. A Wheatstone bridge can be used to determine an unknown_____________?
comments icon0
A. resistance

B. power

C. voltage

D. current

3460. The purpose of RC or transformer coupling is to_____________?
comments icon0

A. Increase thermal stability

B. e of the above

C. Block a.c.

D. Separate bias of one stage from another
3461. The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?
comments icon0

A. 10000

B. 100

C. 1000

D. A million
3462. 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?
comments icon0

A. 999 Hz

B. 459 Hz

C. 2,176 Hz

D. 4,591 Hz
3463. A single stage transistor amplifier contains______________ and associated circuitry?
comments icon0

A. Two transistors

B. One transistor

C. None of the above

D. Three transistor

3464. A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________?
comments icon0

A. 900 volts

B. 90 volts

C. zero

D. 9000 volts
3465. The parallel combination of a 470 ? resistor and a 1.2 k? resistor is in series with the parallel combination of three 3 k? resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of____________?
comments icon0

A. 1.2 k?

B. 3 k?

C. 470 ? or 1.2 k?

D. 470 ?
3466. In transistor amplifiers, we use_____________transformer for impedance matching?
comments icon0

A. Same turn ratio

B. Step up

C. e of the above

D. Step down
3467. Equipotential planes are_______________?
comments icon0
A. parallel to one another

B. intersecting

C. non parallel to one another

D. circular

3468. If a charged rod is brought closer to a gas filled balloon then______________?
comments icon0

A. Radius decreases

B. Balloon bursts

C. Radius increase

D. Balloon squeezes

3469. Selenium becomes a conductor in light so it behaves like____________?
comments icon0

A. Light emitting diode

B. Photodiode

C. Capacitor

D. Semiconductor

3470. Which instrument is used to measure the power of electric circuit ?
comments icon0

A. None of these

B. Wattmeter

C. Viscometer

D. Wavemeter

3471. An AF amplifier is shielded to ________________?
comments icon0

A. Keep the amplifier cool

B. None of the above

C. Prevent induction due to stray magnetic fields

D. Protect from rusting

3472. The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?
comments icon0

A. Mutual induction

B. Torque

C. Magnetic flux density

D. Motional emf

3473. In the zero signal conditions, a transistor sees _____________ load?
comments icon0
A. c.

B. c.

C. both d.c. and a.c.

D. none of the above

3474. Transformer works on the principle of________________?
comments icon0

A. Lenzs law

B. Mutual induction

C. Faradays law

D. Law of conservation of power

3475. The parallel combination of a 470 ? resistor and a 680 ? resistor is in series with the parallel combination of four 2 k? resistors. The total resistance is___________?
comments icon0

A. 1,078 ?

B. 778 ?

C. 77.8 ?

D. 1,650 ?

3476. The parallel combination of a 470 ? resistor and a 1.5 k? resistor is in series with the parallel combination of five 1 k? resistors. The source voltage is 50 V. The percentage of the load current through any single 1 K? resistor is__________?
comments icon0

A. 100%

B. 20 %

C. 50%

D. 25%

3477. In a charged capacitor the energy resides in________________?
comments icon0
A. electric field

B. magnetic hield

C. gravitational field

D. nuclear field

3478. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?
comments icon0

A. 20V

B. 1V

C. 10V

D. 100V

3479. The positive (+) and negative (-) ends of the battery are called ___________?
comments icon0

A. battery sides

B. circuit diagram

C. battery terminals

D. battery knobs

3480. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
comments icon0
A. Vs/Vp = Ns/Np

B. Vp/Vs = Ns/Np

C. Vs/Vp = Np/Ns

D. Vp/Vs = Np/Ns

3481. cmf generated by A.C dynamo depends upon_____________?
comments icon0

A. number of turns in the coil

B. magnetic field strength

C. frequency of rotation

D. all of above
3482. The electric lines of force are____________?
comments icon0

A. physically existing every where

B. physically existing near the charges

C. imaginary

D. depends upon case

3483. SI unit of the permittivity of free space is________________?
comments icon0
A. N-1m-2C2

B. Nm2C2

C. NmC-1

D. N-1mC-2

3484. Two 3.3 k? resistors are in series and this series combination is in parallel with a 4.7 k? resistor. The voltage across one of the 3.3 k? resistors is 12 V. The voltage across the 4.7 k? resistor is_________?
comments icon0

A. 12 V

B. 6 V

C. 0 V

D. 24 V
3485. When a transistor is cut off _________________?
comments icon0

A. Maximum current flows

B. None of the above

C. Maximum voltage appears across transistor

D. Maximum voltage appears across load

3486. 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?
comments icon0

A. 5.03 MHz

B. 5.14 MHz

C. 503 kHz

D. 514 kHz

3487. In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
comments icon0
A. 0 Hz to 3.5 kHz

B. 0 Hz

C. 3.5 kHz

D. 7 kHz

3488. N/C =_____________?
comments icon0

A. A/m

B. V/m

C. J/V

D. V/A

3489. The output stage of a multistage amplifier usually employs______________?
comments icon0

A. None of the above

B. Push-pull amplifier

C. Class A power amplifier

D. Preamplifier

3490. Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________?
comments icon0

A. 9 x 109N

B. 9 x 107N

C. 9.2 x 104N

D. 9 x 109N
3491. Which of the following works on torque on the current carrying conductor placed in magnetic field ?
comments icon0

A. galvanometer

B. all of the above

C. ammeter

D. voltmeter

3492. Self inductance of a coil depends upon________________?
comments icon0

A. number of turns per unit length

B. current flowing

C. all

D. voltage produce

3493. Non inductive resistances are used in decreasing______________?
comments icon0

A. Magnetic fields

B. Self inductance

C. Mutual inductance

D. Heating effect

3494. In a non-uniform electric field a polar molecule will experience____________?
comments icon0

A. Net torque

B. Net force

C. both series and parallel combinations

D. zero

3495. The maximum efficiency of transformer coupled class A power amplifier is _______________?
comments icon0
A. 50%

B. 45%

C. 80%

D. 30%

3496. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?
comments icon0

A. 21.21 V

B. 0 V

C. 10.60 V

D. 15 V

3497. Value of ?r for various dielectrics is always________________?
comments icon0

A. Less than unity

B. No hard and fast rule

C. Equal to the unit

D. Larger than unit
3498. A 25eV electron has a speed of______________?
comments icon0

A. 2 x 106m/sec

B. 4 x 106m/sec

C. 5 x 106m/sec

D. 3 x 106m/sec
3499. An advantage of RC coupling scheme is the___________?
comments icon0

A. High efficiency

B. Good impedance matching

C. Economy

D. None of the above

3500. emf induced in a circuit according to Faradays law depends on the_____________?
comments icon0

A. change in magnetic flux

B. initial magnetic flux

C. maximum magnetic flux

D. rate of change of magnetic flux