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MCQs

Total Questions : 330 | Page 15 of 33 pages
Question 141. The free electrons in practical dielectrics are due to ________
  1.    There are no free electrons
  2.    Conductors
  3.    Impurities
  4.    Displacement currents
 Discuss Question
Answer: Option C. -> Impurities
Answer: (c).Impurities
Question 142. Magnetic fields between the parallel plates of a capacitor are due to?
  1.    Displacement current
  2.    Conduction current
  3.    Both conduction and displacement current
  4.    Neither conduction nor displacement current
 Discuss Question
Answer: Option A. -> Displacement current
Answer: (a).Displacement current
Question 143. Capacitance is directly proportional to__________
  1.    Area of cross section between the plates
  2.    Distance of separation between the plates
  3.    Both area and distance
  4.    Neither area nor distance
 Discuss Question
Answer: Option A. -> Area of cross section between the plates
Answer: (a).Area of cross section between the plates
Question 144. What is the total capacitance when three capacitors, C1, C2 and C3 are connected in parallel?
  1.    C1/(C2+C3)
  2.    C1+C2+C3
  3.    C2/(C1+C3)
  4.    1/C1+1/C2+1/C3
 Discuss Question
Answer: Option B. -> C1+C2+C3
Answer: (b).C1+C2+C3
Question 145. When capacitors are connected in parallel, what happens to the effective plate area?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 146. When capacitors are connected in parallel, the total capacitance is always __________ the individual capacitance values.
  1.    Greater than
  2.    Less than
  3.    Equal to
  4.    Cannot be determined
 Discuss Question
Answer: Option A. -> Greater than
Answer: (a).Greater than
Question 147. Three capacitors having a capacitance equal to 2F, 4F and 6F are connected in parallel. Calculate the effective parallel.
  1.    10F
  2.    11F
  3.    12F
  4.    13F
 Discuss Question
Answer: Option C. -> 12F
Answer: (c).12F
Question 148. Two capacitors having capacitance value 4F, three capacitors having capacitance value 2F and 5 capacitors having capacitance value 1F are connected in parallel, calculate the equivalent capacitance.
  1.    20F
  2.    19F
  3.    18F
  4.    17F
 Discuss Question
Answer: Option B. -> 19F
Answer: (b).19F
Question 149. N capacitors having capacitance C are connected in series, calculate the equivalent capacitance.
  1.    C/N
  2.    C
  3.    CN
  4.    N/C
 Discuss Question
Answer: Option D. -> N/C
Answer: (d).N/C
Question 150. What is the total capacitance when two capacitors C1 and C2 are connected in series?
  1.    (C1+C2)/C1C2
  2.    1/C1+1/C2
  3.    C1C2/(C1+C2)
  4.    C1+C2
 Discuss Question
Answer: Option C. -> C1C2/(C1+C2)
Answer: (c).C1C2/(C1+C2)

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