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
1501. Which of the following coil will have large resonant frequency __________?
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A. A coil with large distributed capacitance

B. A coil with low distributed capacitance

C. A coil with large resistance

D. A coil with low resistance

1502. Electrolyte used in a lead-acid cell is__________?
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A. only water

B. onlyH2S04

C. dilute H2SO4

D. NaOH

1503. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________ ?
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A. 180

B. 90

C. 0

D. 45

1504. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?
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A. reducing time of charging

B. increasing cell capacity

C. both (A) and (B)

D. avoiding excessive gassing

1505. The breakdown voltage of a cable depends on_____________?
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A. time of application of the voltage

B. all of the above

C. presence of moisture

D. working temperature

1506. Which of the following statements pertains to resistors only _____________?
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A. connecting them in parallel increases the total value

B. can act as energy storage devices

C. oppose sudden changes in voltage

D. can dissipate considerable amount of power
1507. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
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A. the current through the resistance is more

B. the current through the resistance is less

C. both resistance and inductance carry equal currents

D. none of the above

1508. Persons preparing electrolyte should wear___________?
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A. goggles or other face shield

B. all above safety devices

C. rubber

D. rubber boots and gloves

1509. Inductance of coil___________?
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A. decreases with the increase in supply frequency

B. becomes zero with the increase in supply frequency

C. is unaffected by the supply frequency

D. increases with the increase in supply frequency
1510. The minimum dielectric stress in a cable is at_____________?
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A. armour

B. lead sheath

C. conductor surface

D. bedding

1511. The open circuit voltage of any storage cell depends wholly upon___________?
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A. all above

B. on the strength of its electrolyte

C. its temperature

D. its chemical constituents

1512. In case of three core flexible cable the colour of the neutral is_________?
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A. blue

B. none of the above

C. black

D. brown

1513. The inductance of a coil can be increased by_________?
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A. choosing core material having high relative permeability

B. decreasing the number of turns

C. decreasing the diameter of the former

D. increasing core length

1514. In a sine wave the slope is constant_______?
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A. between 90 and 180

B. between 0 and 90

C. no where

D. between 180 and 270

1515. In a R-L-C circuit_________?
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A. power is consumed in resistance and is equal to I R

B. exchange of power takes place between inductor and supply line

C. exchange of power does not take place between resistance and the supply line

D. exchange of power takes place between capacitor and supply line

E. all above are correct
1516. In ________ system the charging current is intermittently controlled at either a maximum or minimum value
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A. two rate charge control

B. floating charge

C. an equalizing charge

D. trickle charge

1517. Trickle charging of a storage battery helps to___________?
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A. maintain proper electrolyte level

B. increase its reserve capacity

C. keep it fresh and fully charged

D. prevent sulphation

1518. A dead storage battery can be revived by___________?
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A. none of the above

B. adding distilled water

C. adding so-called battery restorer

D. a dose of H2SO4

1519. The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?
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A. 0

B. 90

C. 60

D. 180?

1520. Skin effect occurs when a conductor carries current at_______ frequencies
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A. medium

B. high

C. very low

D. low

1521. The breakdown of insulation of the cable can be avoided economically by the use of___________?
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A. inter-sheaths

B. insulating materials with different dielectric constants

C. both (A) and (B)

D. none of the above

1522. Excessive formation of lead sulphate on the surface of the plates happens because of___________?
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A. low level of electrolyte

B. topping up with electrolyte

C. allowing a battery to stand in discharged condition for a long time

D. all above

E. persistent undercharging

1523. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
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A. all H2S04

B. two parts H2O, two parts H2SO4

C. one part H2O, three parts H2SO4

D. three parts H2O, one part H2SO4
1524. Capacitive reactance is more when_______?
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A. capacitance is more and frequency of supply is less

B. capacitance is less and frequency of supply is more

C. capacitance is more and frequency of supply is more

D. capacitance is less and frequency of supply is less
1525. Specific gravity of electrolyte in Edison cell is_____________?
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A. 1.21

B. 1.1

C. 0.8

D. 0.95

1526. In capacitance grading a homogeneous dielectric is used
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A. Yes

B. No
1527. The insulation of the cable decreases with__________?
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A. the decrease in the length of the insulation

B. none of the above

C. either A. or (b)

D. the increase in length of the insulation
1528. For a cell to work, which of the following condition(s) become necessary ___________?
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A. All above three conditions are necessary

B. Electrolyte liquid or paste should be conducting

C. Electrolyte must chemically react with one of the electrodes

D. Two electrodes of different metas should be inserted in the electrolyte, not touching each other

1529. The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?
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A. none of the above

B. lead peroxide and lead

C. lead and lead peroxide

D. lead sulphate and lead

1530. In the cables, sheaths are used to___________?
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A. none of the above

B. provide proper insulation

C. prevent the moisture from entering the cable

D. provide enough strength

1531. In a loss-free R-L-C circuit the transient current is__________?
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A. non-oscillating

B. square wave

C. oscillating

D. sinusoidal
1532. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
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A. the capacitive reactance in ohms

B. the statement is incorrect

C. the current flowing in capacitor

D. the size of the capacitor being quite big

1533. The material for armouring on cable is usually__________?
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A. steel tape

B. any of the above

C. galvanised steel wire

D. none of the above

1534. Wire-wound resistors are unsuitable for use at high frequencies because they_______?
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A. create more electrical noise

B. exhibit unwanted inductive and capacitive effects

C. are likely to melt under excessive eddy current heat

D. consume more power

1535. Life of the batteries is in the following ascending order____________?
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A. Lead-acid cell, Nickel-cadmium cell, Edison cell

B. Nickel-cadmium cell, Edison cell, lead-acid cell

C. Edison cell, Nickel-cadmium cell, lead-acid cell

D. Lead-acid cell, Edison cell, Nickel cadmium cell
1536. It is difficult to maintain oil filled cables____________?
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A. No

B. Yes
1537. Internal resistance of a cell is due to___________?
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A. surface contact resistance between electrode and electrolyte

B. electrode resistance

C. resistance of electrolyte

D. all above
1538. When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?
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A. brown

B. none of above

C. dark brown

D. dark grey

1539. In a pure resistive circuit__________?
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A. current can lead or lag the voltage by 90

B. current is in phase with the voltage

C. current lags behind the voltage by 90

D. current leads the voltage by 90

1540. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?
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A. 60 sin 25 t

B. 84.84 sin 25 t

C. 30 sin 50 t

D. 42.42 sin 3141
1541. The capacity of a lead-acid cell is measured in_____________?
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A. watts

B. watt-hours

C. amperes

D. ampere-hours
1542. In a cable, the maximum stress under operating conditions is at___________?
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A. insulation layer

B. sheath

C. armour

D. conductor surface
1543. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
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A. 45

B. 60

C. 90

D. 30

1544. The body of Edison cell is made of___________?
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A. nickel plated steel

B. aluminium

C. rubber

D. bakelite

1545. The r.m.s. value of pure cosine function is_________?
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A. zero

B. 0.5 of peak value

C. 0.707 of peak value

D. same as peak value

1546. Rubber is most commonly used insulation in cables
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A. No

B. Yes
1547. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
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A. 100 s

B. 10 s

C. 0.1 s

D. 0.001 s

1548. In constant voltage charging method, the charging current from discharged to fully charged condition_____________?
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A. none of the above

B. remains constant

C. decreases

D. increases

1549. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?
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A. iron loss in core

B. capacitive effect between adjacent coil turns

C. skin effect

D. increase in temperature

1550. The capacity of a lead-acid cell does not depend on its___________?
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A. rate of charge

B. quantity of active material

C. rate of discharge

D. temperature