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
5751. For germanium transistor amplifier, VCE should_______________for faithful amplification?
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A. None of the above

B. Be zero

C. Be 0.2 V

D. Not fall below 0.7 V
5752. The operating point ________________ on the a.c. load line?
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A. Also line

B. May or may not lie

C. Data insufficient

D. Does not lie

5753. In the above question (Q38.) , what is the collector voltage ?
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A. 6 V

B. 8 V

C. 3 V

D. 7 V

5754. If the value of collector current IC increases, then the value of VCE ______________?
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A. Remains the same

B. None of the above

C. Increases

D. Decreases
5755. The voltage gain of an emitter follower is _____________?
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A. Approximately equal to 1

B. Greater than 1

C. None of the above

D. Much less than 1

5756. The gain of an amplifier with feedback is known as____________gain?
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A. Open loop

B. None of the above

C. Closed loop

D. Resonant

5757. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately________________?
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A. 5000

B. 1000

C. 100

D. 500

5758. Negative feedback is employed in __________________?
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A. Rectifiers

B. None of the above

C. Oscillators

D. Amplifiers
5759. The output impedance of an emitter follower is______________?
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A. Almost zero

B. Very high

C. Low

D. High

5760. When current feedback (negative) is applied to an amplifier, its output impedance ________________?
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A. Remains the same

B. None of the above

C. Is increased

D. Is decreased

5761. When negative voltage feedback is applied to an amplifier, its voltage gain ____________?
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A. Is increased

B. Is reduced

C. Remains the same

D. None of the above

5762. A feedback circuit usually employs _________________ network?
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A. None of the above

B. Capacitive

C. Resistive

D. Inductive

5763. When voltage feedback (negative) is applied to an amplifier, its input impedance _______________?
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A. Is decreased

B. Is increased

C. Remains the same

D. None of the above

5764. When a negative voltage feedback is applied to an amplifier, its bandwidth_____________?
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A. Is increased

B. Insufficient data

C. Is decreased

D. Remains the same

5765. If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?
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A. 10

B. 1

C. 01

D. 15

5766. The value of negative feedback fraction is always _______________?
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A. More than 1

B. None of the above

C. Less than 1

D. Equal to 1

5767. Emitter follower is a _______________circuit?
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A. Voltage feedback

B. Current feedback

C. Both voltage and current feedback

D. None of the above

5768. If voltage feedback (negative) is applied to an amplifier, its output impedance ______________?
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A. Is decreased

B. Remains the same

C. Is increased

D. None of the above

5769. When current feedback (negative) is applied to an amplifier, its input impedance _____________?
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A. None of the above

B. Is decreased

C. Is increased

D. Remains the same

5770. The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become______________?
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A. 103 db

B. 300 db

C. 5 db

D. 97 db</strong>

5771. Emitter follower is used for ________________?
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A. None of the above

B. Voltage gain

C. Impedance matching

D. Current gain

5772. An emitter follower has ______________input impedance?
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A. None of the above

B. High

C. Zero

D. Low

5773. Emitter follower is used for________________?
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A. Current gain

B. Voltage gain

C. Impedance matching

D. None of the above

5774. How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
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A. 1200

B. 10

C. 600

D. 60

5775. Which quantity consists of a unit 1KWh ?
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A. Time

B. Charge

C. Power

D. Energy
5776. The resistance of a few meters of wire conductor in closed electrical circuit is____________?
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A. practically zero

B. high

C. low

D. very high

5777. Instantaneous power in inductor is proportional to the
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A. square of the rate of change of current.

B. emperature of the inductor.

C. square of instantaneous current.

D. product of the instantaneous current and rate of change of current.
5778. Power dissipation in ideal inductor is
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A. Minimum

B. A finite value

C. Zero

D. Maximum

5779. Which is the best conductor of electricity _______________?
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A. Iron

B. Silver

C. Copper

D. Carbon

5780. With rise in temperature the resistance of semi-conductors_________________?
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A. decreases

B. increases

C. remains constant

D. first increases and then decreases

5781. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
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A. 800 Q

B. 600 Q

C. 400 Q

D. 1000 Q

5782. For which of the following ampere second could be the unit ?
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A. Charge

B. Energy

C. Reluctance

D. Power

5783. An instrument which detects electric current is known as_____________?
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A. wattmeter

B. rheostat

C. voltmeter

D. galvanometer
5784. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
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A. The current through each bulb in same

B. None of the above

C. The power dissipation in each bulb is not same

D. The voltage across each bulb is not same

5785. The unit of resistivity is
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A. ? metre.

B. ? / m.

C. ? / metre.

D. ?.

5786. The substances which have a large number of free electrons and offer a low resistance are called____?
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A. conductors

B. insulators

C. semi-conductors

D. inductors

5787. Internal resistance of ideal current source is ?
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A. infinite

B. zero

C. 100 ohms

D. finite

5788. The resistance of a conductor varies inversely as___________?
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A. length

B. area of cross-section

C. temperature

D. resistivity

5789. If 1 A current flows in a circuit, the number of electrons flowing through this circuit is
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A. 0.625 10-<sup>19</sup>

B. 0.625 1019

C. 1.6 10<sup>19</sup>

D. 1.6 10-<sup>19</sup>

5790. Ohms law is not applicable to____________?
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A. circuits with low current densities

B. high voltage circuits

C. vacuum tubes

D. carbon resistors

5791. The voltage induced in an inductor is represented as,
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A. product of its inductance and current through it.

B. product of its inductance and rate of change of current through it.

C. ratio of its inductance to the current through it.

D. ratio of the current through it to its inductance.

5792. Out of the following which is not a poor conductor__________?
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A. Cast iron

B. Tungsten

C. Carbon

D. Copper
5793. Two resistors are said to be connected in series when___________?
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A. same current passes in turn through both

B. both carry the same value of current

C. total current equals the sum of branch currents

D. sum of IR drops equals the applied e.m.f.

5794. Which of the following has no units?
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A. Moment of a magnet

B. Magnetic susceptibility

C. ermittivity

D. Permeability

5795. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
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A. 80 V

B. 132 V

C. 66 v

D. 33 V

5796. Magnetic flux has the unit of
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A. Weber

B. Newton

C. Tesla

D. Ampere-turn

5797. Which of the followings is/are active element?
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A. Current source

B. None of these.

C. Voltage source

D. Both
5798. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
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A. two in parallel

B. three in series

C. two in parallel and one in series

D. three in parallel

5799. The minimum charge on an ion is______________?
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A. equal to the charge of an electron

B. equal to the atomic number of the atom

C. equal to the charge of the number of electrons in an atom (#) zero

5800. Which of the following materials has a negative temperature co-efficient of resistance?
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A. Brass

B. Carbon

C. Aluminum

D. Copper