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MCQs

Total Questions : 227 | Page 4 of 23 pages
Question 31. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
  1.    75 degree
  2.    180 degree
  3.    30 degree
  4.    45 degree
  5.    None of these
 Discuss Question
Answer: Option D. -> 45 degree
Question 32. What form of energy is used for creating static electricity?
  1.    None of these
  2.    Chemical energy
  3.    Solar energy
  4.    Mechanical energy
  5.    Light energy
 Discuss Question
Answer: Option E. -> Light energy
Question 33. Molecule is
  1.    The smallest particle of a substance that retains the properties of that substance
  2.    A atom that flows whenever there is an imbalance of electrical charges between two points
  3.    A atom that has a shortage of electrons in its outer orbit
  4.    None of these
  5.    A atom that has an excessive number of electrons in its outer orbit
 Discuss Question
Answer: Option A. -> The smallest particle of a substance that retains the properties of that substance
Question 34. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
  1.    0.17 V
  2.    18.8 V
  3.    20 V
  4.    None of these
  5.    10.17 V
 Discuss Question
Answer: Option A. -> 0.17 V
Question 35. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
  1.    3.2 mA
  2.    None of these
  3.    13 mA
  4.    3.75 mA
  5.    0.05 mA
 Discuss Question
Answer: Option D. -> 3.75 mA
Question 36. A dielectric material is:
  1.    None of these
  2.    a poor conductor of electrostatic fields
  3.    a good insulator
  4.    a good conductor
  5.    a good conductor of magnetic fields
 Discuss Question
Answer: Option C. -> a good insulator
Question 37. A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
  1.    None of these
  2.    60 Ohm
  3.    50 Ohm
  4.    10 Ohm
  5.    100 Ohm or more
 Discuss Question
Answer: Option E. -> 100 Ohm or more
Question 38. A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
  1.    1000 A
  2.    0.41666666666667
  3.    0.1 A
  4.    100 A
  5.    None of these
 Discuss Question
Answer: Option A. -> 1000 A
Question 39. The number of free electrons and holes in intrinsic semiconductor increases when the temperature
  1.    Increases
  2.    Stays the same
  3.    None of these
  4.    Decreases
  5.    0oC
 Discuss Question
Answer: Option A. -> Increases
Question 40. If a load resistance is 1 kW, a stiff current source has a resistance of
  1.    Less than 10 Ohm
  2.    More than 100 k Ohm
  3.    At least 10 Ohm
  4.    None of these
  5.    Less than 100 k Ohm
 Discuss Question
Answer: Option B. -> More than 100 k Ohm

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