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MCQs

Total Questions : 227 | Page 8 of 23 pages
Question 71. The rotating coil of wire in an electric motor is called the:
  1.    commutator
  2.    None of these
  3.    armature
  4.    brush
  5.    loop
 Discuss Question
Answer: Option C. -> armature
Question 72. The north pole of a magnet is the one:
  1.    that would be attracted to the earth's south magnetic pole
  2.    that would be repelled by the south pole of another magnet
  3.    that has its molecules arranged in a random pattern
  4.    that would be attracted to the earth's north magnetic pole
  5.    None of these
 Discuss Question
Answer: Option D. -> that would be attracted to the earth's north magnetic pole
Question 73. Silicon atoms combine into an orderly pattern called a
  1.    Semiconductor
  2.    Crystal
  3.    None of these
  4.    Valence orbit
  5.    Covalent bond
 Discuss Question
Answer: Option B. -> Crystal
Question 74. The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
  1.    7.8 µA
  2.    7.75 µA
  3.    None of these
  4.    14.8 µA
  5.    10.3 µA
 Discuss Question
Answer: Option D. -> 14.8 µA
Question 75. Current and voltage are said to be in phase when:
  1.    their waveforms are both ac or both dc
  2.    they have the same amplitude and frequency
  3.    their waveforms cross through zero and reach positive and negative peaks at the same time
  4.    All of these
  5.    None of these
 Discuss Question
Answer: Option C. -> their waveforms cross through zero and reach positive and negative peaks at the same time
Question 76. When a parallel RLC circuit is operating at its resonant frequency:
  1.    capacitive reactance is greater than the inductive reactance
  2.    the difference between inductive and capacitive reactance is equal to the resistance
  3.    None of these
  4.    inductive reactance is greater than the capacitive reactance
  5.    inductive reactance is equal to the capacitive reactance
 Discuss Question
Answer: Option E. -> inductive reactance is equal to the capacitive reactance
Question 77. A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?
  1.    None of these
  2.    90 Ohm - 101 ohm
  3.    98 Ohm - 100.1 ohm
  4.    90 Ohm - 110 ohm
  5.    99 Ohm - 102 ohm
 Discuss Question
Answer: Option D. -> 90 Ohm - 110 ohm
Question 78. In a step-down transformer, which is larger?
  1.    Secondary voltage
  2.    Neither
  3.    None of these
  4.    Primary voltage
  5.    Impossible to say
 Discuss Question
Answer: Option D. -> Primary voltage
Question 79. What is the barrier potential of a silicon diode at room temperature?
  1.    0.3V
  2.    1 V
  3.    0.7V
  4.    2 m V per degree Celsius
  5.    None of these
 Discuss Question
Answer: Option C. -> 0.7V
Question 80. For normal operation of the transistor, the collector diode has to be
  1.    Reverse-biased
  2.    Nonconducting
  3.    Operating in the breakdown region
  4.    None of these
  5.    Forward-biased
 Discuss Question
Answer: Option A. -> Reverse-biased

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