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MCQs

Total Questions : 480 | Page 16 of 48 pages
Question 151. Which one of the following statements regarding ac circuits is correct?
  1.    Current and voltages are in phase through a resistor
  2.    Current leads the voltage through a resistor
  3.    Current lags the voltage through a resistor
  4.    All of the above
  5.    None of the above
 Discuss Question
Answer: Option A. -> Current and voltages are in phase through a resistor
Question 152. Which one of the following statements most accurately describes the nature of inductive reactance?
  1.    Inductive reactance is an opposition to current flow in dc circuits
  2.    Inductive reactance is an opposition to current flow in ac circuits
  3.    Inductive reactance is another term for counter emf
  4.    Inductive reactance is a force that tends to overcome the effects of counter emf
  5.    None of the above
 Discuss Question
Answer: Option B. -> Inductive reactance is an opposition to current flow in ac circuits
Question 153. What are the main parts of an atom?
  1.    Protons only
  2.    Electrons, protons, and ions
  3.    Electrons, ions, and neutrons
  4.    Electrons, protons, and neutrons
  5.    None of the above
 Discuss Question
Answer: Option D. -> Electrons, protons, and neutrons
Question 154. Current is
  1.    The flow of charged particles through a material
  2.    An imbalance of electrical charges
  3.    The force that causes electrons to flow
  4.    The number of free electrons in an atom
  5.    None of the above
 Discuss Question
Answer: Option A. -> The flow of charged particles through a material
Question 155. A real voltage source has
  1.    Zero internal resistance
  2.    Infinite internal resistance
  3.    A small internal resistance
  4.    A large internal resistance
  5.    None of the above
 Discuss Question
Answer: Option C. -> A small internal resistance
Question 156. Which one of the following statements is true?
  1.    Current flows in a capacitor circuit only while ions are permitted to flow through the dielectric material
  2.    Current flows in a capacitor circuit only while the charge on the plates is large enough to force the dielectric to conduct electrons
  3.    Current can flow in a capacitor circuit, but not through the dielectric material itself
  4.    Power returned to the circuit is always greater than the power absorbed
  5.    None of the above
 Discuss Question
Answer: Option C. -> Current can flow in a capacitor circuit, but not through the dielectric material itself
Question 157. What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?
  1.    692.2 Ohm
  2.    844.5 Ohm
  3.    3890 Ohm
  4.    1234 Ohm
  5.    None of the above
 Discuss Question
Answer: Option A. -> 692.2 Ohm
Question 158. Holes act like:
  1.    Atoms
  2.    Crystals
  3.    Negative charges
  4.    Positive charges
  5.    None of the above
 Discuss Question
Answer: Option D. -> Positive charges
Question 159. How may valence electrons does a silicon atom have?
  1.    0
  2.    1
  3.    2
  4.    4
  5.    None of the above
 Discuss Question
Answer: Option D. -> 4
Question 160. Reducing the amount of current through an inductor:
  1.    reduces the value of inductance by one-half
  2.    multiplies the value of inductance by four
  3.    multiplies the value of inductance by two
  4.    has no effect on the inductance
  5.    None of the above
 Discuss Question
Answer: Option D. -> has no effect on the inductance

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