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MCQs

Total Questions : 82 | Page 7 of 9 pages
Question 61.  If a Wheatstone bridge is balanced, a voltmeter in the center of the bridge will read:
  1.    the same as the source voltage
  2.    half the source voltage
  3.    zero volts
  4.    twice the source voltage
 Discuss Question
Answer: Option C. -> zero volts
Question 62. . If a series–parallel circuit has all 30-ohm resistors, what is the total resistance when R1 is in series with a parallel circuit consisting of R2 and R3?
  1.    10 ohms
  2.    20 ohms
  3.    45 ohms
  4.    90 ohms
 Discuss Question
Answer: Option C. -> 45 ohms
Question 63. . If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
  1.    increases
  2.    decreases
  3.    remains the same
  4.    cannot tell
 Discuss Question
Answer: Option B. -> decreases
Question 64. . Components or combinations of components with common currents, in a series–parallel circuit, are in:
  1.    parallel with each other
  2.    series with each other
  3.    either series or parallel with each other
  4.    none of the above
 Discuss Question
Answer: Option C. -> either series or parallel with each other
Question 65. . The first goal(s) to accomplish in analyzing a complex series–parallel circuit is to:
  1.    equate all parallel components
  2.    equate all series components
  3.    solve for all the voltage drops
  4.    solve for the total current and resistance
 Discuss Question
Answer: Option D. -> solve for the total current and resistance
Question 66. . What determines if resistor connections are in series, parallel, or series–parallel?
  1.    the voltage source
  2.    the power source
  3.    resistance
  4.    current flow
 Discuss Question
Answer: Option D. -> current flow
Question 67. . If R1 is in series with a parallel combination of R2, R3, and R4, when the resistance value of R2 increases, the voltage across R3 will
  1.    increase
  2.    decrease
  3.    remain the same
  4.    Cannot tell
 Discuss Question
Answer: Option A. -> increase
Question 68. . 
With 6 V applied, what is the voltage across R2 of a parallel combination of R2 (1 k omega.gif), R3 (2 k omega.gif), and R4 (1 k omega.gif) in series with R1, whose value is 2 k omega.gif?
  1.    1 V
  2.    3 V
  3.    5 V
  4.    6 V
 Discuss Question
Answer: Option A. -> 1 V
Question 69. . A Thevenin equivalent circuit contains _____.
  1.    a voltage source in series with a resistance
  2.    a current source in series with a resistance
  3.    resistors in a series-parallel configuration
  4.    many voltage sources
 Discuss Question
Answer: Option A. -> a voltage source in series with a resistance
Question 70. . A Wheatstone bridge can be used to determine an unknown
  1.    current
  2.    resistance
  3.    power
  4.    voltage
 Discuss Question
Answer: Option B. -> resistance

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