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MCQs

Total Questions : 162 | Page 13 of 17 pages
Question 121. A series circuit consists of three resistors with values of 120 , 270 , and 330 . The total resistance is
  1.    120
  2.    720
  3.    less than 120
  4.    the average of the values
 Discuss Question
Answer: Option B. -> 720
Question 122. Which of the following series combinations dissipates the most power when connected across a 120 V source?
  1.    three 220 resistors
  2.    four 220 resistors
  3.    two 220 resistors
  4.    one 220 resistor
 Discuss Question
Answer: Option D. -> one 220 resistor
Question 123.  If the resistance total in a series circuit doubles, current will:
  1.    be the same
  2.    be doubled
  3.    reduce source voltage
  4.    be halved
 Discuss Question
Answer: Option D. -> be halved
Question 124.  One of the most common applications of a potentiometer is as an adjustable voltage divider, also known as
  1.    voltage control
  2.    current control
  3.    volume control
  4.    divider control
 Discuss Question
Answer: Option C. -> volume control
Question 125.  With a total resistance of 3300 ohms and a 45 V source, if R3 is 1200 ohms, what will be its voltage drop?
  1.    16.36 V
  2.    32.72 V
  3.    10.90 V
  4.    15.00 V
 Discuss Question
Answer: Option A. -> 16.36 V
Question 126.  Kirchhoff’s voltage law states that:
  1.    the sum of the voltage drops in a series circuit is equal to the total applied voltage
  2.    the algebraic sum of the resistances is equal to the sum of the voltages
  3.    the algebraic sum of the individual currents around a closed loop is zero
  4.    the voltages developed across each element in a series circuit are identical
 Discuss Question
Answer: Option A. -> the sum of the voltage drops in a series circuit is equal to the total applied voltage
Question 127.  
An 8-ohm resistor is in series with a lamp. The circuit current is 1 A. With 20 V applied, what voltage is being allowed for the lamp?
  1.    4 V
  2.    8 V
  3.    12 V
  4.    20 V
 Discuss Question
Answer: Option C. -> 12 V
Question 128.  If series current doubles, then:
  1.    resistance is halved
  2.    voltage is doubled
  3.    voltage is reduced
  4.    resistance is doubled
 Discuss Question
Answer: Option A. -> resistance is halved
Question 129.  Power is defined as:
  1.    the rate at which work is done
  2.    work
  3.    the conversion of energy
  4.    joules
 Discuss Question
Answer: Option A. -> the rate at which work is done
Question 130.  A short circuit has:
  1.    too much resistance
  2.    no conductance
  3.    no resistance
  4.    low current
 Discuss Question
Answer: Option C. -> no resistance

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