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
1701. The value of E within the field due to a point charge can be found with the help of___________?
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A. Kirchhoff s laws

B. none of the above

C. Faradays laws

D. Coulombs laws
1702. A conductor carries 125 amperes of current under 60 to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?
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A. 120 N

B. 240 N

C. 480 N

D. 50 N

1703. In a magnetic material hysteresis loss takes place primarily due to___________?
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A. flux density lagging behind magnetising force

B. it high retentivity

C. rapid reversals of its magnetisation

D. molecular friction

1704. Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ________?
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A. 50

B. 100

C. 150

D. 200

1705. Air capacitors are generally available in the range_________?
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A. 10 to 400 pF

B. 20 to 100 pF

C. 1 to 20 pF

D. 100 to 900 pF

1706. A capacitance of 100 fiF is connected in series with a resistance of 8000 2. The time constant of the circuit is______________?
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A. 0.4 s

B. 0.6 s

C. 0.8 s

D. 0.2 s

1707. For a purely inductive circuit which of the following is true ?
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A. Actual power of the circuit is zero

B. Apparent power is zero

C. Any capacitance even if present in the circuit will not be charged

D. Relative power is.zero

1708. Dielectric strength _________ with increasing thickness
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A. remains unaltered

B. increases

C. decreases

D. none of the above

1709. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?
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A. 150 joules

B. 200 joules

C. 250 joules

D. 50 joules

1710. at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ?
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A. Electric flux

B. Electric intensity

C. None of the above

D. Magnetic flux density

1711. Which of the following is not a unit of inductance ?
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A. Volt second per ampere

B. All of the above

C. Henry

D. Coulomb/volt ampere
1712. A field line and an equipotential surface are____________?
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A. always parallel

B. always at 90

C. inclined at any angle 0

D. none of the above

1713. Which of the following capacitors will have the least variation ____________?
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A. Paper capacitor

B. None of the above

C. Ceramic capacitor

D. Silver plated mica capacitor
1714. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
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A. No

B. Yes

1715. Copper oxide rectifier is usually designed not to operate above___________?
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A. 20C

B. 30C

C. 10C

D. 45C
1716. A capacitor consists of two____________?
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A. conductors separated by an insulator

B. insulators separated by a dielectric

C. silver-coated insulators

D. ceramic plates and one mica disc

1717. Which of the following is the loss within the mercury arc rectifier chamber ?
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A. Voltage drop at the anode

B. All of the above

C. Voltage drop in arc

D. Voltage drop at the cathode

1718. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
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A. 6 H

B. 24 H

C. 8 H

D. 12 H
1719. In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?
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A. to reduce evaporation of water from electrolyte

B. to exclude dirt and foreign matter from the electrolyte

C. to discharge both of the above functions

D. to discharge none of the above functions

1720. is that property of a capacitor which delays any change of voltage across it ?
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A. Potential gradient

B. Inductance

C. None of the above

D. Capacitance
1721. In case of an inductance, current is proportional to___________?
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A. voltage across the inductance

B. magnetic field

C. both A. and B.

D. neither (A) nor (B)

1722. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?
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A. 12 mH

B. 4 mH

C. 6 mH

D. 5 mH

1723. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?
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A. 48 mH

B. 24 mH

C. 14 mH

D. 6 mH

1724. 1 volt/meter is same as___________?
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A. 1 newton/meter

B. 1 newton meter

C. 1 joule/coulomb

D. 1 meter/coulomb

1725. An uncharged conductor is placed near a charged conductor, then_____________?
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A. the uncharged conductor gets charged by conduction

B. it remains as such

C. the uncharged conductor is attracted first and then charged by induction

D. the uncharged conductor gets charged by induction and then attracted towards the charging body
1726. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is___________?
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A. 0.12 F

B. 0.8 F

C. 0.024 F

D. 0.6 F

1727. The capacity of capacitor bank used in power factor correction is expressed in terms of____________?
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A. kVA

B. volts

C. kW

D. kVAR
1728. In a capacitor, the electric charge is stored in_________?
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A. metal plates

B. dielectric

C. none of the above

D. dielectric as well as metal plates

1729. Which of the following capacitors is marked for polarity ?
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A. Paper

B. Air

C. Mica

D. Electrolytic
1730. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be_____________?
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A. 1000 uF

B. 10 uF

C. 100 nF

D. 10 F

1731. Hard steel is suitable for making permanent magnets because_____________?
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A. its mechanical strength is low

B. it has good residual magnetism

C. its hysteresis loop has large area

D. its mechanical strength is high

1732. In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.
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A. any of the above

B. none of the above

C. decelerates

D. accelerates
1733. Which of the following statements is correct ___________?
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A. Electrolytic capacitor must be connected in the correct polarity

B. Air capacitors have a black band to indicate the outside foil

C. Ceramic capacitors must be connected in the correct polarity

D. Mica capacitors are available in capacitance value of 1 to 10 pF

1734. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?
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A. 20 Wb

B. 0.2 Wb

C. 2 Wb

D. 0.02 Wb
1735. When the dielectric is homogeneous,the potential gradient is_____________?
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A. any of the above

B. zero

C. non-uniform

D. uniform
1736. The total deficiency or excess of electrons in a body is known as____________?
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A. charge

B. voltage

C. potential gradient

D. current

1737. Dielectric strength of a medium is usually expressed in____________?
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A. kV/mm

B. N/mm

C. J/mm

D. C/m2

1738. Capacitance increases with_____________?
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A. reduction in plate area and distance between the plates

B. increase in plate area and decrease in distance between the plates

C. decrease in plate area and value of applied voltage

D. increase in plate area and distance between the plates

1739. The number of Faraday tubes of flux passing through a surface in an electric field is called____________?
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A. electric flux density

B. electric charge density

C. magnetic flux density

D. electric flux
1740. Electric displacement is a__________quantity
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A. scalar

B. vector

C. both of the above

D. none of the above

1741. Hysteresis loss least depends on____________?
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A. volume of material

B. ambient temperature

C. frequency

D. steinmetz coefficient of material

1742. Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
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A. high, low

B. low, high

C. high, high

D. low, low

1743. In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as______________?
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A. critical grid voltage

B. maximum grid voltage

C. any of the above

D. none of the above

1744. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
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A. Current density

B. Conductivity

C. E.m.f.

D. Current
1745. The units of volume charge density are___________?
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A. Coulomb/meter

B. Coulomb/meter

C. Coulomb/meter

D. Coulomb/meter
1746. Electric field intensity is a quantity_____________?
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A. scalar

B. vector

C. both A. and (6)

D. none of the above

1747. On which of the following factors the number of phases for which a rectifier should be designed depend ?
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A. The voltage regulation of the rectifier should be low

B. all of the above

C. In the output circuit there should be no harmonics

D. The rectifier supply transformer should be utilized to the best ad-vantage

E. The power factor of the system should be high

1748. Permeability in a magnetic circuit corresponds to________ in an electric circuit
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A. resistance

B. conductance

C. conductivity

D. resistivity

1749. A paper capacitor is usually available in the form of_____________?
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A. rolled foil

B. tubes

C. meshed plates

D. disc

1750. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?
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A. not be in equilibrium

B. move out of the field of influence of the two charges

C. remain in stable equilibrium

D. be in unstable equilibrium