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
3651. The upper or lower cut off frequency is also called______________frequency?
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A. Sideband

B. 3 db

C. Resonant

D. None of the above

3652. In a CE amplifier, voltage gain =____________________ x RAC/Rin?
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A. ?

B. (1 + ?)

C. (1+ ?)

D. ?

3653. A class A power amplifier uses _________________?
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A. Three transistors

B. None of the above

C. Two transistors

D. One transistor
3654. A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?
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A. negative

B. data is insufficient

C. zero

D. positive

3655. In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
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A. Is constant

B. None of the above

C. Changes abruptly with frequency

D. Changes uniformly with frequency

3656. In a seriesparallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2s voltage will:___________?
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A. decrease

B. cannot tell

C. increase

D. remain the same

3657. When the motor is at its maximum speed then back emf will be______________?
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A. No back emf

B. Intermediate values

C. Maximum

D. Zero

3658. The minimum charge on any object cannot be less than_______________?
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A. 9.1 x 109C

B. 1.6 x 10-19C

C. 3.2 x 10-19C

D. no definite value exist

3659. Magnetic compass needle will be deflecting if it is kept near________________?
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A. Static charge

B. Semi-conductor

C. Soft iron

D. Accelerating charge
3660. The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?
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A. The same as

B. More than

C. Less than

D. None of the above

3661. In obtaining the frequency response curve of an amplifier, the______________?
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A. Amplifier level output is kept constant

B. Generator output level is held constant

C. Generator frequency is held constant

D. Amplifier frequency is held constant

3662. In a certain low-pass filter, fc = 3.5 kHz. Its passband is____________?
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A. 0 Hz

B. 7 kHz

C. 3.5 kHz

D. 0 Hz to 3.5 kHz
3663. For long distance transmission the transformer used is_____________?
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A. Step up

B. Input voltage and output voltage remain same

C. Step down

D. Amplifier is used

3664. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________?
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A. depends upon composition of dielectric

B. remain constant

C. decrease

D. increase

3665. Electric intensity being a vector quantity always points_______________?
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A. any of above

B. along the direction of force experienced by a unit positive charge

C. opposite to the direction of force experienced by a unit positive charge

D. perpendicular to the direction of force experienced by a uit positive charge

3666. In the initial stages of a multistage amplifier, we use______________?
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A. Direct coupling

B. Transformer coupling

C. None of the above

D. RC coupling
3667. The value of the capacitance depends upon the________________?
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A. voltage applied

B. dinsity of the capacitor plates

C. thickness of the capacitor plates

D. geometry of the capacitor
3668. The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?
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A. 3

B. 3-Jan

C. 6

D. 1

3669. A certain Wheatstone bridge has the following resistor values: R1 = 10 k?, R2 = 720 ?, and R4 = 2.4 k?. The unknown resistance is_____________?
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A. 3,000 ?

B. 300 ?

C. 24 ?

D. 2.4 ?

3670. A radio receiver has____________of amplification?
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A. More than one stages

B. Two stages

C. One stage

D. Three stages

3671. 1 db corresponds to_____________change in power level?
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A. 50%

B. 26%

C. 22%

D. 35%

3672. A capacitor is a perfect insulator for______________?
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A. direct current

B. alternating current

C. both for the direct and alternating current

D. none of above

3673. The purpose of d.c. conditions in a transistor is to___________________?
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A. Reverse bias the emitter

B. None of the above

C. Set up operating point

D. Forward bias the collector

3674. Which one of the following functions like a motor ?
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A. voltmeter

B. galvanometer

C. ammeter

D. all of above
3675. In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?
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A. Thin base

B. None of the above

C. Wide emitter

D. Thin collector

3676. A 12 k? resistor, a 15 k? resistor, and a 22 k? resistor are in series with two 10 k? resistors that are in parallel. The source voltage is 75 V. Current through the 15 k? resistor is approximately___________?
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A. 5 mA

B. 14 mA

C. 1.4 mA

D. 50 mA

3677. The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?
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A. Reduces the effect of eddy current

B. Decreases the resistance of the solenoid

C. Improves the flux linkage between the turns of the coil

D. Increases the mutual inductance between the solenoid and the core

3678. The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ?
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A. 1 W

B. 2 W

C. None of the above

D. 4 W

3679. If the coil is wound on an iron core the flux through it will_______________?
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A. become zero

B. increase

C. decrease

D. remain the same

3680. The parallel combination of a 6.8 k? resistor and a 10 k? resistor is in series with the parallel combination of a 2.2 k? resistor and a 1 k? resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________?
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A. 6.8 k?

B. 2.2 k?

C. 2.2 k? and 1 k?

D. 6.8 k? and 10 k?
3681. Electric flux linked with a surface will be maximum when____________?
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A. All of the above

B. The surface makes an angle of 45with the field

C. The surface is held parallel to the electric field

D. The surface is held perpendicular to the electric field
3682. If two charges are increased by two times then force_____________?
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A. Decreases 9 times

B. Increases 9 times

C. Increases 4 times

D. Decreases 4 times

3683. Current produced by moving the loop of wire across a magnetic field is called_____________?
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A. mean square current

B. D.C current

C. induced current

D. A.C current

3684. The noise factor of an ideal amplifier expressed in db is_____________?
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A. 1

B. 0

C. 1

D. 10

3685. The maximum collector efficiency of class B operation is ________________?
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A. 50%

B. 5%

C. 90%

D. 5%
3686. The slope of a.c. load line is ______________ that of d.c. load line?
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A. More than

B. None of the above

C. The same as

D. Less than

3687. A dynamo converts______________?
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A. mechanical energy into electrical energy

B. electrical energy into mechanical energy

C. magnetic energy into electrical energy

D. magnetic energy into mechanical energy

3688. If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?
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A. High

B. Very high

C. Low

D. Moderate

3689. A.C and D.C have the same______________?
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A. effect in charging a battery

B. heating effect through a resistance

C. effect while passing through an inductance

D. effect in charging a capacitor

3690. The final stage of a multistage amplifier uses______________?
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A. Direct coupling

B. Impedance coupling

C. Transformer coupling

D. RC coupling

3691. When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?
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A. Direct

B. RC

C. Transformer

D. None of the above

3692. capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?
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A. 2 volts

B. 9 volts

C. 1 vol

D. 4 volts

3693. In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?
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A. 270o

B. 0o

C. 180o

D. 90o

3694. If the power level of an amplifier reduces to half, the db gain will fall by___________?
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A. 5 db

B. 2 db

C. 10 db

D. 3 db
3695. The only difference between construction of D.C generator and A.C generator is that of_______________?
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A. commutator

B. magnetic field

C. coil

D. carbon brushes

3696. A class A power amplifier is sometimes called______________amplifier?
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A. Symmetrical

B. Reciprocating

C. Single-ended

D. Differential

3697. Power amplifiers generally use transformer coupling because transformer permits______________?
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A. Distortionless output

B. Cooling of the circuit

C. Good frequency response

D. Impedance matching
3698. 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. 8.30 dB

D. 0.8 dB

3699. A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
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A. A torque about horizontal axis

B. An upward force along the axis

C. No resultant force

D. A torque about vertical axis

3700. If free space between the plates of a capacitor is replaced by a dielectric_____________?
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A. The potential difference remains constant capacittance and energy stored increases

B. The potential difference remains constant capacittance decreases and energy increases

C. The potential difference decreases but both capacitance and energy increase

D. both potential difference and capacitance decrease but energy increases