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MCQs

Total Questions : 227 | Page 18 of 23 pages
Question 171. How much current flows through a 60-W light bulb that is operating at 120 V?
  1.    0.5A
  2.    180 A
  3.    7200 A
  4.    None of these
  5.    0.083333333333333
 Discuss Question
Answer: Option A. -> 0.5A
Question 172. What is the power dissipation of a resistance that has 24 V dropped across it and 0.25 A flowing through it?
  1.    6 W
  2.    3 W
  3.    None of these
  4.    64 W
  5.    122 W
 Discuss Question
Answer: Option A. -> 6 W
Question 173. A device that converts light energy to electrical energy is called a:
  1.    thermocouple
  2.    photodiode
  3.    solar cell
  4.    photo transistor
  5.    None of these
 Discuss Question
Answer: Option C. -> solar cell
Question 174. Which one of the following equations most directly determines the power dissipation of a resistance when you know the power dissipation of a resistance when you know the voltage drop and current?
  1.    P = E2/R
  2.    I = P/E
  3.    P = I2R
  4.    None of these
  5.    P = IE
 Discuss Question
Answer: Option E. -> P = IE
Question 175. If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?
  1.    None of these
  2.    60 V
  3.    40 V
  4.    36 V
  5.    0 V
 Discuss Question
Answer: Option B. -> 60 V
Question 176. An ideal voltage source has
  1.    A load dependent voltage
  2.    Zero internal resistance
  3.    None of these
  4.    A load-dependent current
  5.    Infinite internal resistance
 Discuss Question
Answer: Option B. -> Zero internal resistance
Question 177. A transistor has how many doped regions?
  1.    3
  2.    1
  3.    None of these
  4.    4
  5.    2
 Discuss Question
Answer: Option A. -> 3
Question 178. What is the difference between the kinds of charges for an electron and a proton?
  1.    An electron has a positive charge and a proton has a negative charge
  2.    None of these
  3.    An electron has a negative charge and a proton has a positive charge
  4.    An electron has a positive charge and a proton has no charge
  5.    An electron has a negative charge and a proton has no charge
 Discuss Question
Answer: Option C. -> An electron has a negative charge and a proton has a positive charge
Question 179. Which one of the following kinds of materials has the highest permeability?
  1.    A paramagnetic material
  2.    A ferromagnetic material
  3.    All of these
  4.    None of these
  5.    A diamagnetic material
 Discuss Question
Answer: Option B. -> A ferromagnetic material
Question 180. Inductive reactance is measured in units of:
  1.    amperes per second
  2.    None of these
  3.    Ohm
  4.    henrys
  5.    volts per second
 Discuss Question
Answer: Option C. -> Ohm

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