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
5801. Varistors are______________?
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A. resistors with zero temperature coefficient

B. carbon resistors

C. non-linear resistors

D. insulators

5802. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?
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A. 4.6 A, 6.9 A

B. 6.4 A, 6.9 A

C. 4.6 A, 9.6 A

D. 6.4 A, 9.6 A
5803. Electric pressure is also called________?
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A. power

B. energy

C. voltage

D. resistance

5804. Which of the following statement is true both for a series and a parallel D. C. circuit?
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A. Currents are additive

B. Power are additive

C. Elements have individual currents

D. Voltages are additive

5805. Conductance is reciprocal of____________?
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A. reluctance

B. resistance

C. inductance

D. capacitance

5806. Inductor does not allow the sudden change of
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A. voltage

B. current

C. power

D. None of the above

5807. The hot resistance of the bulbs filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
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A. positive

B. about 2 ohms per degree

C. zero

D. negative

5808. The rating of a fuse wire is always expressed in________________?
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A. kWh

B. ampere-hours

C. amperes

D. ampere-volts

5809. The resistivity of the conductor depends on
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A. type of material.

B. length of the conductor.

C. area of the conductor.

D. none of these.

5810. Which of the following material has nearly zero temperature co-efficient of resistance_________?
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A. Carbon

B. Copper

C. Porcelain

D. Manganin
5811. A resistance having rating 10 ohms, 10 W is likely to be a__________?
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A. variable resistor

B. wire wound resistor

C. metallic resistor

D. carbon resistor

5812. All of the following are equivalent to watt except_____________?
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A. joules/seC.

B. amperes x volts

C. amperes/volt

D. (amperes) ohm

5813. Which of the following statement is true________________?
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A. A galvanometer with low resistance in series is an ammeter

B. A galvanometer with high resistance in series is an ammeter

C. A galvanometer with low resistance in parallel is a voltmeter

D. A galvanometer with high resistance in parallel is a voltmeter

5814. Which one of the following does not have negative temperature co-efficient ____________?
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A. Rubber

B. Paper

C. Mica

D. Aluminium
5815. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
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A. 300 ?

B. 100 ?

C. 400 ?

D. 200 ?

5816. Which of the following are the passive elements?
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A. Bulb

B. None of these.

C. Both

D. Resistor

5817. A 3 Q resistor having 2 A current will dissipate the power of_______________?
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A. 12 watts

B. 2 watts

C. 4 watts

D. 6 watts

5818. Internal resistance of ideal voltage source is ?
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A. zero

B. finite

C. 100 ohms

D. infinite

5819. The resistance of a conductor of diameter d and length l is R ?. If the diameter of the conductor is halved and its length is doubled, the resistance will be
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A. R ?

B. 2R ?

C. 4R ?

D. 8R ?
5820. With rise in temperature the resistance of pure metals______________?
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A. decreases

B. increases

C. remains constant

D. first increases and then decreases

5821. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
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A. 0.8 ohm

B. 1.0 ohm

C. 0.4 ohm

D. 0.6 ohm

5822. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
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A. 18 Q

B. 64 Q

C. 36 Q

D. 48 Q

5823. The property of a conductor due to which it passes current is called___________?
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A. reluctance

B. inductance

C. resistance

D. conductance
5824. Insulating materials have the function of___________?
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A. conducting very large currents

B. preventing an open circuit between the voltage source and the load

C. storing very high currents

D. preventing a short circuit between conducting wires

5825. The filament of an electric bulb is made of______________?
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A. tungsten

B. carbon

C. aluminium

D. nickel

5826. Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?
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A. none of them

B. Ri

C. Rl

D. either Rl or Ri

5827. In a series circuit with unequal resistances______________?
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A. the lowest resistance has the highest current

B. the highest resistance has the most of the current through it

C. the lowest resistance has the highest voltage drop

D. the highest resistance has the highest voltage drop
5828. Which of the following quantities consists of SI unit as WATT ?
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A. Power

B. Current

C. Charge

D. Force

5829. Out of the following which is an insulating material____________?
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A. Paper

B. Copper

C. Gold

D. Silver

5830. Current velocity through a copper conductor is___________?
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A. the same as propagation velocity of electric energy

B. independent of current strength

C. nearly 3 x 108 m/s

D. of the order of a few ^.s/m
5831. Insulating materials have the function of______________?
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A. preventing an open circuit between the voltage source and the load

B. conducting very large currents

C. preventing a short circuit between conducting wires

D. storing very high currents

5832. If P is the power of a star connected system then what will be power of an equivalent delta connected system?
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A. 3P

B. P/3

C. None of the above

D. P

5833. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open_________________?
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A. there will be heavy current in the main line

B. rest of the two bulbs will not light

C. the other two bulbs will light

D. all three bulbs will light

5834. A closed switch has a resistance of_____________?
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A. about 50 ohms

B. zero

C. about 500 ohms

D. infinity

5835. Which quantity should be measured by the voltmeter ?
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A. Current

B. Power

C. Speed

D. Voltage
5836. The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?
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A. 1.8 x 10?8 Q-m

B. 1.6 x 10?8 Q-m

C. 1.2 x 10~8 Q-m

D. 1.4 x 10~8 Q-m

5837. Capacitor does not allow the sudden change of ?
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A. None of the above

B. power

C. current

D. voltage
5838. If a parallel circuit is opened in the main line, the current_______________?
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A. is zero in all branches

B. increases in the branch of the lowest resistance

C. increases in each branch

D. is zero in the highest resistive branch

5839. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
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A. 9 times

B. 1/9 times

C. unchanged

D. 3 times

5840. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
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A. remain constant

B. none of the above

C. decrease

D. increase
5841. Bulbs in street lighting are all connected in_____________?
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A. series

B. parallel

C. series-parallel

D. end-to-end

5842. are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?
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A. Thermistor

B. Variable resistors

C. Semi-conductors

D. Varistors

5843. Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?
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A. arcs across separating contacts

B. mechanical noise of high intensity

C. both mechanical noise and arc between contacts

D. none of the above

5844. For testing appliances, the wattage of test lamp should be_____________?
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A. any value

B. low

C. very low

D. high
5845. Which of the following can have negative temperature coefficient _____________?
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A. Metallic alloys

B. Liquid metals

C. Compounds of silver

D. Electrolytes
5846. A thermistor has_____________?
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A. zero temperature coefficient

B. positive temperature coefficient

C. negative temperature coefficient

D. variable temperature coefficient

5847. Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?
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A. Capacitor

B. Resistor

C. Inductor

D. Reactor

5848. When one leg of parallel circuit is opened out the total current will______________?
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A. become zero

B. reduce

C. decrease

D. increase

5849. A nichrome wire used as a heater coil has the resistance of 2 2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?
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A. 60 m

B. 80 m

C. 40 m

D. 20 m
5850. Voltage dependent resistors are used_____________?
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A. for inductive circuits

B. to supress surges

C. as heating elements

D. as current stabilizers