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Electric Circuits and Fields

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Electric Circuits and Fields

shape Introduction

Electric Circuits and Fields is a core course in every Electrical Engineering curriculum, with a wide range of applications to a variety of problems related to electrical in general. The chapter includes some of basic fundamental questions of Electric Circuits and Fields primarily instrumental for aspirants of recruitment exams in India and also for aspirants of The Graduate Aptitude Test in Engineering [GATE] in India.

shape Quiz

Q1. Coulomb’s law is true for
    A. atomic distances ([latex]= {10}^{–11m}[/latex]) B. nuclear distances ([latex]= {10}^{–15m}[/latex]) C. charged as well as uncharged particles D. all the distances Answer: D

Q2. Electric flux at a point in an electric field is
    A. positive B. negative C. zero D. none of these Answer: C

Q3. As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity
    A. increases B. decreases C. remains constant D. may increase or decrease depending on the actual temperature. Answer: C

Q4. The unit of capacitance of a capacitor is
    A. joule B. henry C. farad D. ampere Answer: C

Q5. Consider the following two statements.
    1. Kirchoff’s junction law follows from conservation of charge. 2. Kirchoff’s loop law follows from conservative nature of electric field. A. Both A and B are correct B. A is correct but B is wrong C. B is correct but A is wrong D. Both A and B are wrong Answer: B

Q6. The unit of specific resistance is
    A. [latex]{m}^{–1}[/latex] B. [latex]{m}^{1}[/latex] C. m D. 2.5m Answer: C

Q7. The example of non-ohmic resistance is
    A. diode B. copper wire C. filament lamp D. carbon resistor Answer: A

Q8. Kirchoff’s first law, i.e., S i = 0 at a junction, deals with the conservation of
    A. charge B. energy C. momentum D. angular momentum Answer: A

Q9. One Kilowatt hour is equal to
    A. 36 × 105joule B. 36 × 103joule C. 103joule D. 105joule Answer: A

Q10. The capacitance between points PandQ in circuit shown in fig is
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    A. 1mF B. 1.5mF C. 9 D. 6.75mF Answer: A
Q11. Specific resistance of a conductor depends upon:
    A. composition of the conductor B. length of the conductor C. area of cross-section of the conductor D. resistance of the conductor Answer: A

Q12. With increase in temperature, the resistance of copper:
    A. decreases B. increases C. becomes zero D. remains constant Answer: D

Q13. Specific resistance of a substance is measured in:
    A. ohm/m B. m/ohm C. mho/m D. mho Answer: C

Q14. One Kilowatt hour of electrical energy is the same as
    A. 36 × 105 Watts B. 36 × 105 ergs C. 36 × 105 Joules D. 36 × 105 B.T.V Answer: C

Q15. Krichoff current laws is applicable to only:
    A. closed loops in a network B. electronic circuits C. junctions in a network D. electric circuits Answer: D

Q16. Filaments of electric bulbs are usually made of:
    A. nichrome B. carbon C. tungsten D. copper Answer: C

Q17. Ohms law is not applicable to:
    A. D.c. circuits B. High currents C. Small resistors D. Semiconductors Answer: D

Q18. The element of electric heater is made of:
    A. copper B. carbon C. steel D. nichrome Answer: D

Q19. In the SI system of units, the unit of force is:
    A. kg wt B. newton C. joule D. N-m Answer: D

Q20. A light dependent resistors is basically a:
    A. power resistor B. non-metallic resistor C. carbon resistor D. variable resistor Answer: B
Q21. In MKS system one Kilowatt is equal to
    A. 1.36 HP B. 1.34 HP C. 1.5 HP D. 1.6 HP Answer: C

Q22. Voltage dependent resistors are used as:
    A. current stabilizers B. as heating elements C. for inductive circuits D. to suppress surges Answer: B

Q23. In which of the following the resistance decreases with rise in temperature?
    A. LDR B. NTC thermistors C. Nichrome conductors D. ACSR conductors Answer: D

Q24. An uncharged metal ball is placed in the uniform electric field of a plane capacitor. Which of them correctly represents the field lines on the ball ?
    A.
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    B.
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    C.
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    D. None of the above Answer: B

Q25. There is a point charge +q inside a hollow sphere and a point charge –q just outside its surface. The total flux passing through the sphere
    A. [latex]\frac {q}{0}[/latex] B. [latex]\frac {0}{q}[/latex] C. [latex]\frac {2q}{0}[/latex] D. Zero Answer: C

Q26. Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero.
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    A. 1 B. 2 C. 3 D. 4 Answer: D

Q27. For a given surface the Gauss's law is stated as[latex]O \overrightarrow{E} .D \overrightarrow{A}[/latex]From this we can conclude that
    A. E is necessarily zero on the surface B. E is perpendicular to the surface at every point C. The total flux through the surface is zero D. The flux is only going out of the surface Answer: B

Q28. The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by
    A. electric field is zero but potential is not zero B. electric field is not zero but potential is zero C. neither electric field nor potential is zero Answer: C

Q29. Two charges are at a distance d apart. If a copper plate (conducting medium) of thickness[latex]d^{2}[/latex]is placed between them, the effective force will be
    A. 2F B. [latex]\frac {F}{2}[/latex] C. 0 D. [latex]\sqrt{2}F[/latex] Answer: A

Q30. Electric potential at any point is 5x+3x+[latex]\sqrt{15}z[/latex] then the magnitude of the electric field is
    A. [latex]{3}\sqrt{2}[/latex] B. [latex]{4}\sqrt{2}[/latex] C. [latex]{5}\sqrt{2}[/latex] D. 7 Answer: D
Q31. The RMS value of the voltage u(t)=3+4cos(3t)is
    A. [latex]\sqrt{17}V[/latex] B. 5V C. 7V D. ([latex]3+2\sqrt{2}V[/latex] Answer: A

Q32. If E is the Electric Field intensity, then π . (π × E) is Equal to
    A. [latex]O \overrightarrow{E}[/latex] B. E C. Null Vector D. Zero Answer: C

Q33. A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of the electric field intensity, E, at a distance r (0 < r < R) inside the sphere?
    A. [latex]\frac {3}{4{\pi}_{o}} \frac {{q}_{r}}{{R}^{3}}[/latex] B. [latex]\frac {4}{3{\pi}_{o}} \frac {{q}_{r}}{{R}^{3}}[/latex] C. [latex]\frac {3}{2{\pi}_{o}} \frac {{q}_{r}}{{R}^{2}}[/latex] D. [latex]\frac {3}{4{\pi}_{o}} \frac {{q}_{r}}{{R}^{4}}[/latex] Answer: A

Q34. The number of chords in the graph of the given circuit will be
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    A. 3 B. 4 C. 5 D. 6 Answer: A

Q35. The current through the 2 kW resistance in the circuit shown is
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    A. zero B. 1 mA C. 2 mA D. 6 mA Answer: A

Q36. Which of the following statements associated with capacitors is wrong?
    A. A capacitor resists an abrupt change in the voltage across it in a manner analogous to the way a spring resists abrupt change in the current flowing through it. B. A capacitor resists an abrupt change in the current flowing through it. C. It is impossible to change the voltage across a capacitor by a finite amount in zero time, for this requires infinite current through the capacitor. D. A finite amount of energy can be stored in a capacitor even if the current through the capacitor is zero, such as when the voltage across it is a constant. Answer: B

Q37. To a highly inductive circuit, a small capacitance is added in series. The angle between voltage and current will
    A. increase B. Decrease C. remain nearly the same D. become in determinant Answer: B

Q38. The resistivity of the conductor depends on
    A. Area of the conductor. B. Length of the conductor. C. Type of material. D. None of these. Answer: A

Q39. A capacitor carries a charge of 0.1 C at 5 V. Its capacitance is
    A. 0.02 F B. 0.5 F C. 0.05 F D. 0.2 F Answer: C

Q40. 1F is theoretically equal to
    A. 1ohm of resistance B. Ratio of 1 V to 1 C C. Ratio of 1 C to 1 V D. None of these Answer: C
Q41. Which of the followings is/are active element?
    A. Voltage source B. Current source C. Both D. None of these. Answer: C

Q42. Power dissipation in ideal inductor is
    A. Maximum B. Minimum C. Zero D. A finite value Answer: C

Q43. Which of the following are the passive elements?
    A. Resistor B. Bulb C. Both D. None of these. Answer: C

Q44. Internal resistance of ideal voltage source is
    A. Zero B. Infinite C. Finite D. 100 ohms Answer: A

Q45. Mesh analysis is applicable for
    A. Planar networks B. Non planar networks C. Both planar & non-planar networks. D. Neither planar nor non planar networks Answer: A

Q46. KCL works on the principle of which of the following
    A. Law of conservation of charge B. Law of conservation of energy C. Both D. None of the above Answer: A

Q47. Average power taken by the pure capacitor is
    A. Zero B. Minimum C. Maximum D. Any of the above Answer: A

Q48. KVL works on the principle of
    A. Law of conservation of charge B. Law of conservation of energy C. Both D. None of the above Answer: B

Q49. Super position theorem is not applicable for
    A. Current calculations B. Voltage calculations C. Power calculations D. None of the above Answer: C

Q50. Internal resistance of ideal current source is
    A. Zero B. Infinite C. Finite D. 100 ohms Answer: B
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