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
3601. Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________?
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A. negatively charged

B. positively and negatively charged

C. positively charged

D. electrically neutral
3602. If the collector supply is 10V, then collector cut off voltage under d.c. conditions is _______________?
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A. 20 V

B. 2 V

C. 5 V

D. 10 V
3603. Transformer coupling is used for__________amplification?
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A. Voltage

B. Power

C. Current

D. None of the above

3604. The point of intersection of d.c. and a.c. load lines is called________________?
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A. None of the above

B. Cut off point

C. Saturation point

D. Operating point
3605. A transistor amplifier has high output impedance because ______________?
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A. Emitter is heavily doped

B. Collector has reverse bias

C. Collector is wider than emitter or base

D. None of the above

3606. The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?
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A. Avoid voltage gain drop

B. None of the above

C. Forward bias the emitter

D. Reduce noise in the amplifier

3607. The most costly coupling is _______________ coupling?
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A. Direct

B. RC

C. Impedance

D. Transformer
3608. A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
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A. 20 kO

B. 10 kO

C. 100 kO

D. 5 kO

3609. An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?
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A. Eddy current

B. Back emf

C. None of the above

D. Induced current

3610. Electric flux due to a point charge +q is______________?
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A. q/?0

B. 1/4II?0. q/r2

C. 4II?0

D. 1/4II? q/r

3611. A power amplifier has comparatively __________________ ?
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A. None of the above

B. Small

C. Very large

D. Large

3612. A.C cannot be used for________________?
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A. producing heat

B. producing light

C. magnetizing and electroplating

D. all the above

3613. With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?
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A. 600 mA

B. 400 mA

C. 200 mA

D. 800 mA

3614. In RC coupling, the value of coupling capacitor is about_______________?
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A. 100 pF

B. 10 F

C. 0.01 F

D. 0.1 F

3615. Transformer coupling provides high efficiency because___________?
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A. collector voltage is stepped down

B. Collector voltage is stepped up

C. none of the above

D. resistance is low
3616. Two 1.2 k? resistors are in series and this series combination is in parallel with a 3.3 k? resistor. The total resistance is____________?
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A. 1,389 ?

B. 138 ?

C. 880 ?

D. 5,700 ?

3617. The electric charge of 100 C is 13cm apart from another charge 16.9C electric force between them is_____________?
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A. 9x105N

B. 9x106N

C. 900N

D. 9x107N

3618. Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?
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A. Flux

B. Hysteresis

C. Permeability

D. Retaintivity

3619. In an RC coupling scheme, the coupling capacitor CC must be large enough______________?
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A. To pass d.c. between the stages

B. Not to attenuate the low frequencies

C. None of the above

D. To dissipate high power

3620. A 6 V battery output is divided down to obtain two output voltages. Three 2.2 k? resistors are used to provide the two taps. The two output voltages are___________?
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A. 2 V, 4 V

B. 2 V, 2 V

C. 4 V, 6 V

D. 2 V, 6 V

3621. RC coupling is not used to amplify extremely low frequencies because____________?
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A. There is hum in the output

B. None of the above

C. There is considerable power loss

D. Electrical size of coupling capacitor becomes very large
3622. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
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A. Power loss in the coupling device

B. Loading effect of the next stage

C. use of many capacitors

D. The use of many transistors

3623. 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. is 12 kHz

C. cannot be determined

D. is 10 kHz

3624. 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. 9 V peak-to-peak

B. 18 V peak-to-peak

C. zero

D. 12.73 V peak-to-peak

3625. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
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A. Frequency

B. None of the above

C. Amplitude

D. Intermodulation

3626. Transformer coupling is generally employed when load resistance is______________?
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A. Large

B. Very large

C. Small

D. None of the above

3627. It is generally desired that a transistor should have_____________________ input impedance?
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A. Very high

B. High

C. Low

D. Very low

3628. The lower and upper cut off frequencies are also called_____________frequencies?
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A. Sideband

B. Resonant

C. Half-power

D. Half-resonant

3629. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?
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A. 5 db

B. 8 db

C. 4 db

D. 6 db

3630. In a seriesparallel circuit, individual component power dissipation are calculated using_____________?
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A. total current squared multiplied by the resistor values

B. a percent of the voltage division ratio squared

C. individual component parameters

D. a percent of the total power depending on resistor ratios

3631. Transformer coupling can be used in______________amplifiers?
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A. None of the above

B. Only voltage

C. Either power or voltage

D. Only power

3632. The output stage of a multistage amplifier is also called _________________-?
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A. Power stage

B. Mixer stage

C. Detector stage

D. F stage

3633. A transistor converts __________________?
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A. none of the above

B. c. power into d.c. power

C. c. power into a.c. power

D. high resistance into low resistance

3634. If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?
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A. 165

B. None of the above

C. 165 x 104

D. 100

3635. Power amplifiers handle ______________ signals compare to voltage amplifiers?
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A. None of the above

B. Large

C. Small

D. Very small

3636. The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?
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A. 2 W

B. 6 W

C. 68 W

D. None of the above

3637. If the input capacitor of a transistor amplifier is short-circuited, then_________________?
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A. Signal will not reach the base

B. Transistor will be destroyed

C. None of the above

D. Biasing conditions will change
3638. The value of emitter capacitor CE in a multistage amplifier is about____________?
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A. 1 F

B. 50 F

C. 100 pF

D. 0.01 F

3639. A voltage divider consists of two 68 k? resistors and a 24 V source. The unknown output voltage is______________?
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A. 24 V

B. 12 V

C. 0 V

D. 6 V

3640. Three 10 k? resistors are connected in series. A 20 k? resistor is connected in parallel across one of the 10 k? resistors. The voltage source is 24 V. The total current in the circuit is___________?
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A. 90 mA

B. 9 mA

C. 800 ?A

D. 900 ?A
3641. If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?
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A. RC

B. RL + RC

C. RL RC

D. RC || RL
3642. What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
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A. 7

B. None of the above

C. 2

D. 3

3643. In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________?
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A. None of the above

B. Short

C. Open

D. Partially short

3644. 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. 93.8 kHz

B. 861 Hz

C. 86.12 kHz

D. 93.8 Hz

3645. 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. 12.74 V peak-to-peak

D. zero
3646. A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?
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A. 103 C

B. 4 x 103 C

C. 2.5 x 10-8 C

D. 10-5 C
3647. In practice, voltage gain is expressed______________?
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A. None of the above

B. In volts

C. As a number

D. In db
3648. For highest power gain, one would use _________________configuration?
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A. none of the above

B. CC

C. CE

D. CB

3649. A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?
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A. RC || RE

B. RC

C. RC RE

D. RC + RE
3650. A device able to supply electrical energy is a __________?
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A. battery

B. microwave

C. nonconductor

D. conductor