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MCQs

Total Questions : 71 | Page 3 of 8 pages
Question 21. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
  1.    40 Ω
  2.    4 Ω
  3.    2 Ω
  4.    20 Ω
 Discuss Question
Answer: Option D. -> 20 Ω
Question 22. When 12 V are applied across a 68 Ω resistor, the current is
  1.    816 mA
  2.    17.6 mA
  3.    176 mA
  4.    8.16 mA
 Discuss Question
Answer: Option C. -> 176 mA
Question 23. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
  1.    220 kΩ
  2.    22 kΩ
  3.    2.2 kΩ
  4.    220 Ω
 Discuss Question
Answer: Option C. -> 2.2 kΩ
Question 24. Ohm's law describes how current is related to voltage and resistance.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 25. 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.    9 V
  2.    900 mV
  3.    0 V
  4.    18 V
 Discuss Question
Answer: Option A. -> 9 V
Question 26. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
  1.    1.8 V
  2.    18 V
  3.    7.2 V
  4.    72 V
 Discuss Question
Answer: Option D. -> 72 V
Question 27. 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.    112 Ω
  2.    11.2 Ω
  3.    1.2 Ω
  4.    18 Ω
 Discuss Question
Answer: Option A. -> 112 Ω
Question 28. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
  1.    3.3 kΩ
  2.    33 kΩ
  3.    2.2 kΩ
  4.    22 kΩ
 Discuss Question
Answer: Option A. -> 3.3 kΩ
Question 29. The formula to find I when the values of V and R are known is
  1.    I = VR
  2.    I = R/V
  3.    V = IR
  4.    I = V/R
 Discuss Question
Answer: Option D. -> I = V/R
Question 30. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
  1.    9.7 Ω
  2.    97 Ω
  3.    23 Ω
  4.    230 Ω
 Discuss Question
Answer: Option D. -> 230 Ω

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