Electronic Devices and Circuits MCQs with answers Page - 26

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Q. "In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources". The above statement is associated with

  • (A) thevenins theorem
  • (B) nortons theorem
  • (C) superposition theorem
  • (D) none of the above

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Q. Kirchhoff s law is applicable to

  • (A) passive networks only
  • (B) a.c. circuits only
  • (C) d.c. circuits only
  • (D) both a.c. as well d.c. circuits

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Q. Kirchhoff s law is not applicable to circuits with

  • (A) lumped parameters
  • (B) passive elements
  • (C) distributed parameters
  • (D) non-linear resistances

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Q. The resistance LM will be

  • (A) 6.66 q
  • (B) 12 q
  • (C) 18q
  • (D) 20q

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Q. For high efficiency of transfer of power, internal resistance of the source should be

  • (A) equal to the load resistance
  • (B) less than the load resistance
  • (C) more than the load resistance
  • (D) none of the above

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Q. Efficiency of power transfer when maximum transfer of power c

  • (A) 100%
  • (B) 80%
  • (C) 75%
  • (D) 50%

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Q. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is

  • (A) 10 q
  • (B) 20 q
  • (C) 30 q
  • (D) 40 q

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Q. For maximum transfer of power, internal resistance of the source should be

  • (A) equal to load resistance
  • (B) less than the load resistance
  • (C) greater than the load resistance
  • (D) none of the above

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Q. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be

  • (A) a voltage source
  • (B) a current source
  • (C) both of above
  • (D) none of the above

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Q. The circuit whose properties are same in either direction is known as

  • (A) unilateral circuit
  • (B) bilateral circuit
  • (C) irreversible circuit
  • (D) reversible circuit

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