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MCQs

Total Questions : 99 | Page 3 of 10 pages
Question 21. To determine the polarity of the voltage drop across a resistor, it is necessary to know
  1.    Value of current through the resistor
  2.    Direction of current through the resistor
  3.    Value of resistor
  4.    E.m.f. in the circuit
 Discuss Question
Answer: Option B. -> Direction of current through the resistor
Question 22. Thevenin resistance Rth is found
  1.    by removing voltage sources along with their internal resistances
  2.    by short-circuiting the given two terminals
  3.    between any two ‘open’ terminals
  4.    between same open terminals as for Etk
 Discuss Question
Answer: Option D. -> between same open terminals as for Etk
Question 23. An ideal voltage source has
  1.    Zero internal resistance
  2.    Open circuit voltage equal to the voltage on full load
  3.    Terminal voltage in proportion to current
  4.    Terminal voltage in proportion to load
 Discuss Question
Answer: Option A. -> Zero internal resistance
Question 24. Kirchhoff’s law is applicable to
  1.    Passive networks only
  2.    A.C. circuits only
  3.    D.C. circuits only
  4.    Both A.C. as well D.C. circuits
 Discuss Question
Answer: Option D. -> Both A.C. as well D.C. circuits
Question 25. A star circuit has element of resistance R/2. The equivalent delta elements will be
  1.    R/6
  2.    RIG
  3.    3/2R
  4.    4R
 Discuss Question
Answer: Option C. -> 3/2R
Question 26. Millman’s theorem yields
  1.    Equivalent resistance
  2.    Equivalent impedance
  3.    Equivalent voltage source
  4.    Equivalent voltage or current source
 Discuss Question
Answer: Option D. -> Equivalent voltage or current source
Question 27. While calculating Rth in Thevenin’s theorem and Norton equivalent
  1.    All independent sources are made dead
  2.    Only current sources are made dead
  3.    Only voltage sources are made dead
  4.    All voltage and current sources are made dead
 Discuss Question
Answer: Option A. -> All independent sources are made dead
Question 28. A nonlinear network does not satisfy
  1.    Superposition condition
  2.    Homogeneity condition
  3.    Both homogeneity as well as superposition condition
  4.    Homogeneity, superposition and associative condition
 Discuss Question
Answer: Option C. -> Both homogeneity as well as superposition condition
Question 29. Which of the following is non-linear circuit parameter?
  1.    Inductance
  2.    Condenser
  3.    Wire wound resistor
  4.    Transistor
 Discuss Question
Answer: Option A. -> Inductance
Question 30. Efficiency of power transfer when maximum transfer of power c xerosis
  1.    100%
  2.    80%
  3.    75%
  4.    50%
 Discuss Question
Answer: Option D. -> 50%

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