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
3551. Electric intensity at infinite distance from the point charge is_____________?
comments icon0

A. negative

B. infinite

C. zero

D. positive

3552. The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
comments icon0

A. 1.5Hzs

B. 106sec

C. 1sec

D. 1Hzs
3553. A.C cannot be used for_______________?
comments icon0

A. all the above

B. producing light

C. producing heat

D. magnetizing and electroplating
3554. The purpose of capacitors in a transistor amplifier is to___________________?
comments icon0

A. Protect the transistor

B. Couple or bypass a.c. component

C. Cool the transistor

D. Provide biasing

3555. A current amplification of 2000 is a gain of_________________?
comments icon0

A. 3 db

B. 20 db

C. 200 db

D. 66 db
3556. The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?
comments icon0

A. 200,000 ?

B. 20,000 ?

C. 100,000 ?

D. 1,000,000 ?

3557. 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?
comments icon0
A. 5.97 V

B. 6 V

C. 597 mV

D. 0 V

3558. A certain circuit is composed of two parallel resistors. The total resistance is 1,403 ?. One of the resistors is 2 k?. The other resistor value is____________?
comments icon0
A. 4.7 k?

B. 2 k?

C. 1,403 ?

D. 3,403 ?

3559. 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_____________?
comments icon0
A. 3,617 Hz

B. 362 Hz

C. 723 Hz

D. 7,234 Hz

3560. In class A operation, the operating point is generally located_____________of the d.c. load line?
comments icon0

A. At cut off point

B. At the middle

C. At saturation point

D. None of the above

3561. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V.the filters bandwidth is____________?
comments icon0
A. 53 Hz

B. 530 Hz

C. 106 Hz

D. 11.5 Hz

3562. Class C amplifiers are used as ___________________?
comments icon0

A. AF amplifiers

B. Detectors

C. None of the above

D. amplifiers
3563. Potential difference is the work done in moving unit positive charge form one point to another________________?
comments icon0

A. in any direction

B. against electric intensity

C. in the direction of electric flux

D. in the direction of electric intensity

3564. 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?
comments icon0
A. 5.97 V

B. 597 mV

C. 0 V

D. 6 V

3565. On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
comments icon0
A. 1,000 V

B. 500 V

C. 1 V

D. 50 V

3566. The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?
comments icon0
A. 5 mV

B. 2 mV

C. 5 mV

D. 8 mV

3567. The number of stages that can be directly coupled is limited because___________?
comments icon0
A. Changes in temperature cause thermal instability

B. It becomes difficult to bias the circuit

C. None of the above

D. Circuit becomes heavy and costly

3568. The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?
comments icon0

A. Less than

B. More than

C. Data insufficient

D. The same as

3569. A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?
comments icon0

A. 100 eV

B. 200J

C. 100J

D. 1000J

3570. In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________?
comments icon0
A. Short

B. Partially open

C. Open

D. None of the above

3571. The frequency response of transformer coupling is___________?
comments icon0

A. Very good

B. Excellent

C. Poor

D. Good

3572. The disadvantage of impedance matching is that it _______________?
comments icon0

A. Requires a transformer

B. Gives distorted output

C. None of the above

D. Gives low power output

3573. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?
comments icon0

A. 5 W

B. 75 W

C. 33 W

D. 1 W
3574. Which one of the following devices does not function like an electric motor ?
comments icon0
A. Transformer

B. Ammeter

C. Galvanometer

D. Voltmeter

3575. An amplifier has a power gain of 100. Its db gain is ________________?
comments icon0

A. None of the above

B. 20 db

C. 40 db

D. 10 db

3576. If the distance between the two point charges become half then force between them becomes______________?
comments icon0

A. remains same

B. half

C. double

D. four times
3577. A certain voltage divider consists of two 12 k? resistors in series. Which of the following load resistors will have the most effect on the output voltage?
comments icon0

A. 18 k?

B. 24 k?

C. 1 M?

D. 12 k?
3578. For electroplating we use_________________?
comments icon0

A. an A.C source

B. all of the above

C. any source

D. A D.C source
3579. 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___________?
comments icon0
A. 125 Hz

B. 564 Hz

C. 5,644 Hz

D. 1,250 Hz

3580. Which of the following uses electric energy and does not convert it into any other form ?
comments icon0
A. transformer

B. D.C generator

C. A.C generator

D. motor

3581. 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)?
comments icon0
A. 10.9 V

B. 1.09 V

C. 12 V

D. 1.1 V

3582. When an a.c. signal is applied to an amplifier, ,the operating point moves along_________________?
comments icon0

A. c. load line

B. c. load line

C. both d.c. and a.c. load lines

D. none of the above

3583. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?
comments icon0
A. 20 W

B. 80 W

C. 40 W

D. 10 W

3584. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ______________ operation?
comments icon0

A. Class B

B. Class A

C. None of the above

D. Class C
3585. 1 db corresponds to_____________change in voltage or current level?
comments icon0

A. 80%

B. 40%

C. 25%

D. 20%

3586. Photocopier and inject printer are dealt in________________?
comments icon0

A. Charges in motion

B. Capacitors

C. Electrostatics

D. Electric fields

3587. If metallic conductor is charged negatively then its weight______________?
comments icon0

A. First increases then decreases

B. Increases for a while

C. Remains same

D. Decreases then increases

3588. The most important consideration in power amplifier is __________________?
comments icon0
A. Collector efficiency

B. None of the above

C. Biasing the circuit

D. To keep the transformer cool

3589. Power loss in actual transformer is due to_________________?
comments icon0

A. Soft iron core

B. Back emf

C. Small output

D. Eddy currents and magnetic hysterias
3590. The best frequency response is of_____________coupling?
comments icon0

A. RC

B. None of the above

C. Transformer

D. Direct
3591. The current flowing through an unloaded voltage divider is called the____________?
comments icon0

A. resistor current

B. bleeder current

C. voltage current

D. load current

3592. A voltage divider consists of two 100 k? resistors and a 12 V source. What will the output voltage be if a load resistor of 1 M? is connected to the output?
comments icon0

A. 6 V

B. 0.57 V

C. 5.7 V

D. 12 V

3593. When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read_____________?
comments icon0

A. half the source voltage

B. the same as the source voltage

C. zero volts

D. twice the source voltage

3594. 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?
comments icon0

A. 111 mV

B. 200 mV

C. 11.1 mV

D. 1.1 mV

3595. A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
comments icon0
A. 0.03125 volt

B. 3.125 volt

C. 31.25 volt

D. 0 volt

3596. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
comments icon0
A. 20 W

B. 10 W

C. 15 W

D. 5 W

3597. If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
comments icon0

A. cannot tell

B. decreases

C. increases

D. remains the same

3598. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?
comments icon0

A. RL

B. RC + RL

C. RC

D. RC || RL

3599. The input capacitor in an amplifier is the______________ capacitor?
comments icon0

A. None of the above

B. Bypass

C. Coupling

D. Leakage

3600. The ratio of output impedance of a CE amplifier is _______________?
comments icon0

A. About 1

B. Low

C. High

D. Moderate