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
5851. 74. Sparking occurs when a load is switched off because the circuit has high_________?
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A. inductance

B. resistance

C. capacitance

D. impedance

5852. Resistance of a material always decreases if___________?
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A. number of free electrons available become more

B. temperature of material is decreased

C. temperature of material is increased

D. none of the above is correct

5853. Nichrome wire is an alloy of_____________?
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A. copper and silver

B. lead and zinc

C. nickel and chromium

D. chromium and vanadium

5854. Conductance : mho :: ____________?
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A. capacitance : henry

B. inductance : farad

C. resistance : ohm

D. lumen : steradian

5855. A glass rod when rubbed with silk cloth is charged because__________?
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A. it takes in proton

B. it gives away positive charge

C. its atoms are removed

D. it gives away electrons
5856. International ohm is defined in terms of the resistance of________________?
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A. the unit length of wire

B. a cube of copper

C. a cube of carbon

D. a column of mercury
5857. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
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A. 100 W lamp will glow brighter

B. 40 W lamp will glow brighter

C. Both lamps will glow equally bright

D. 40 W lamp will fuse

5858. A field of force can exist only between_____________?
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A. two metal particles

B. two molecules

C. two atoms

D. two ions
5859. The thickness of insulation provided on the conductor depends on_____________?
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A. the magnitude of voltage on the conductor

B. the magnitude of current flowing through it

C. both A. and (b)

D. none of the above

5860. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________
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A. increase

B. remain same

C. decrease

D. heater will burn out

5861. In the case of direct current____________?
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A. magnitude and direction of current remains constant

B. magnitude and direction of current changes with time

C. magnitude of current remains constant

D. magnitude of current changes with time

5862. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?
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A. 160 ohms

B. 80 ohms

C. 20 ohms

D. 10 ohms
5863. If/, R and t are the current, resistance and time respectively, then according to Joules law heat produced will be proportional to_______________?
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A. I2R2t

B. I2Rf

C. I2R2t*

D. I2Rt
5864. Which of the following quantities remain the same in all parts of a series circuit ____________?
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A. Current

B. Voltage

C. Power

D. Resistance

5865. Temperature co-efficient of resistance is expressed in terms of___________?
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A. ohms/C

B. mhos/ohmC

C. mhos/C

D. ohms/ohmC
5866. The insulation on a current carrying conductor is provided__________?
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A. to prevent leakage of current

B. to prevent shock

C. both of above factors

D. none of above factors

5867. It becomes more difficult to remove_________________?
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A. third electron from the orbit

B. any electron from the orbit

C. second electron from the orbit

D. first electron from the orbit

5868. Ohms law is not applicable to__________?
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A. small resistors

B. D. C. circuits

C. semi-conductors

D. high currents

5869. In a lamp load when more than one lamp are switched on the total resistance of the load_____________?
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A. remains same

B. increases

C. decreases

D. none of the above

5870. A substance whose molecules consist of dissimilar atoms is called____________?
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A. compound

B. super-conducto

C. semi-conductor

D. insulator

5871. Which of the following statement is correct_______________?
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A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

B. A semi-conductor is a material made of alternate layers of conducting material and insulator

C. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator

D. A semi-conductor is one which conducts only half of the applied voltage

5872. When electric current passes through a metallic conductor, its temperature rises. This is due to__________?
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A. mutual collisions between metal atoms

B. mutual collisions between conducting electrons

C. the release of conduction electrons from parent atoms

D. collisions between conduction electrons and atoms
5873. When current flows through heater coil it glows but supply wiring does not glow because______________?
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A. current through supply line flows at slower speed

B. supply wires are made of superior material

C. resistance of heater coil is more than the supply wires

D. supply wiring is covered with insulation layer

5874. One newton meter is same as_____________?
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A. one watt

B. one joule second

C. five joules

D. one joule
5875. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?
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A. 25:04:00

B. 2 : 5

C. 5:02

D. 4:25

5876. 1 angstrom is equal to______________?
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A. 10-8 mm

B. 10?10 m

C. 10?6 cm

D. 10~14 m

5877. An open resistor, when checked with an ohm-meter reads_____________?
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A. low but not zero

B. zero

C. infinite

D. high but within tolerance

5878. The condition for the validity under Ohms law is that_______________?
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A. current should be proportional to the size of the resistance

B. resistance must be wire wound type

C. temperature at positive end should be more than the temperature at negative end

D. resistance must be uniform
5879. A rheostat differs from potentiometer in the respect that it_____________?
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A. offers large number of tapping

B. has large number of turns

C. has higher wattage rating

D. has lower wattage rating

5880. Which method can be used for absolute measurement of resistances _______________?
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A. Lorentz method

B. Releigh method

C. Ohms law method

D. Wheatstone bridge method

5881. All good conductors have high____________?
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A. conductance

B. resistance

C. reluctance

D. thermal conductivity

5882. An electric filament bulb can be worked from____________?
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A. All above

B. Battery supply only

C. A. C. supply only

D. D. C. supply only

5883. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?
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A. 9 times

B. 3 times

C. 1/9 times

D. 1/3 times

5884. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is___________?
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A. 106 mho

B. 1 n-mho

C. none of the above

D. 1 milli-mho

5885. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?
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A. 8/3 Q

B. 6 Q

C. 3/2 Q

D. 4 Q
5886. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
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A. length of heating element should be decreased

B. length of heating element should be increased

C. length of heating element has no effect on heating if water

D. none of the above

5887. The ratio of mass of proton to that of electron is nearly_____________?
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A. 1840

B. 4

C. 1840

D. 30

5888. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
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A. 20 W

B. 40 W

C. 60 W

D. 10 W

5889. If the efficiency of a machine is to be high, what should be low __________?
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A. Ratio of output to input

B. Losses

C. kWh consumed

D. Input power

E. True component of power

5890. Voltage dependent resistors are usually made from________________?
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A. Nichrome

B. Graphite

C. Charcoal

D. Silicon Carbide
5891. Electric current passing through the circuit produces_____________?
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A. luminous effect

B. all above effects

C. chemical effect

D. thermal effect

E. magnetic effect

5892. The number of electrons in the outer most orbit of carbon atom is___________?
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A. 3

B. 7

C. 4

D. 6

5893. When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
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A. D. C.

B. any of above two

C. A. C.

D. none of the above

5894. Two multimeters A and B have sensitivities of 10 kO/V and 30 kO/V respectively. Then ______________?
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A. Multimeter A is more sensitive

B. Multimeter B is more sensitive

C. Both are equally sensitive

D. None of the above

5895. A VTVM is never used to measure ______________?
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A. None of the above

B. Resistance

C. Voltage

D. Current
5896. Which of the following is likely to have the largest resistance ?
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A. Moving coil galvanometer

B. A copper wire of length 1 m and diameter 3 mm

C. Ammeter of range 1 A

D. Voltmeter of range 10 V
5897. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement ?
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A. 3 kO

B. kO

C. 6 kO

D. kO

5898. A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is________________?
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A. (n-1)G

B. G/(n-1)

C. nG

D. G/n

5899. The most accurate device for measuring voltage is ____________?
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A. Voltmeter

B. VTVM

C. CRO

D. Multimeter

5900. The resistance of an ideal voltmeter is ______________?
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A. Low

B. Infinite

C. High

D. Zero