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MCQs

Total Questions : 71 | Page 6 of 8 pages
Question 51. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
  1.    23
  2.    97
  3.    230
  4.    9.7
 Discuss Question
Answer: Option C. -> 230
Question 52. A resistance of 3.3 M is connected across a 500 V source. The resulting current is approximately
  1.    151 µA
  2.    15.1 µA
  3.    660 mA
  4.    66 mA
 Discuss Question
Answer: Option A. -> 151 µA
Question 53. The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately
  1.    11.2
  2.    18
  3.    112
  4.    1.2
 Discuss Question
Answer: Option C. -> 112
Question 54. If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
  1.    8 V
  2.    3.2 V
  3.    320 V
  4.    32 V
 Discuss Question
Answer: Option D. -> 32 V
Question 55. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
  1.    22 k
  2.    220
  3.    2.2 k
  4.    220 k
 Discuss Question
Answer: Option C. -> 2.2 k
Question 56. You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
  1.    0 V
  2.    9 V
  3.    900 mV
  4.    18 V
 Discuss Question
Answer: Option B. -> 9 V
Question 57. How much resistance is needed to draw 17.6 mA from a 12 volt source?
  1.    68
  2.    6.8 k
  3.    680
  4.    212
 Discuss Question
Answer: Option C. -> 680
Question 58. Four amperes of current are measured through a 24 resistor connected across a voltage source. How much voltage does the source produce?
  1.    9.6 V
  2.    8 V
  3.    960 V
  4.    96 V
 Discuss Question
Answer: Option D. -> 96 V
Question 59. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
  1.    4.4
  2.    4
  3.    4 k
  4.    400
 Discuss Question
Answer: Option C. -> 4 k
Question 60. How much current is produced by a voltage of 18 kV across a 15 k resistance?
  1.    1.2 A
  2.    120 mA
  3.    12 mA
  4.    12 A
 Discuss Question
Answer: Option A. -> 1.2 A

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