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MCQs

Total Questions : 96 | Page 6 of 10 pages
Question 51. A sudden increase in the total current into a parallel circuit may indicate
  1.    an increase in source voltage
  2.    a drop in source voltage
  3.    an open resistor
  4.    either a drop in source voltage or an open resistor
 Discuss Question
Answer: Option A. -> an increase in source voltage
Question 52. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is
  1.    310 mA
  2.    800 mA
  3.    0 A
  4.    490 mA
 Discuss Question
Answer: Option D. -> 490 mA
Question 53. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is
  1.    31.25 mA
  2.    15 mA
  3.    60 mA
  4.    135 mA
 Discuss Question
Answer: Option A. -> 31.25 mA
Question 54. If one of the resistors in a parallel circuit is removed, the total resistance
  1.    remains the same
  2.    decreases
  3.    doubles
  4.    increases
 Discuss Question
Answer: Option D. -> increases
Question 55. In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is
  1.    12 mA
  2.    48 mA
  3.    3 mA
  4.    0 A
 Discuss Question
Answer: Option A. -> 12 mA
Question 56. Six resistors are in parallel. The two lowest-value resistors are both 1.2 k. The total resistance
  1.    is less than 600
  2.    is less than 1.2 k
  3.    is greater than 1.2 k
  4.    is less than 6 k
 Discuss Question
Answer: Option A. -> is less than 600
Question 57. An ammeter has an internal resistance of 50 . The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately
  1.    5.5
  2.    9
  3.    55
  4.    50
 Discuss Question
Answer: Option A. -> 5.5
Question 58. The total resistance of a parallel circuit is 50 . If the total current is 120 mA, the current through the 270 resistor that makes up part of the parallel circuit is approximately
  1.    22 mA
  2.    120 mA
  3.    50 mA
  4.    220 mA
 Discuss Question
Answer: Option A. -> 22 mA
Question 59. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is
  1.    1 A
  2.    unknown
  3.    7 A
  4.    the larger of the two
 Discuss Question
Answer: Option C. -> 7 A
Question 60. When an additional resistor is connected across an existing parallel circuit, the total resistance
  1.    increases by the value of the added resistor
  2.    decreases
  3.    remains the same
  4.    decreases by the value of the added resistor
 Discuss Question
Answer: Option B. -> decreases

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