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MCQs

Total Questions : 227 | Page 23 of 23 pages
Question 221. A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?
  1.    None of these
  2.    651 V
  3.    707 V
  4.    700 V
  5.    208 V
 Discuss Question
Answer: Option B. -> 651 V
Question 222. What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?
  1.    None of these
  2.    220 ohm
  3.    690 ohm
  4.    150 ohm
  5.    445 ohm
 Discuss Question
Answer: Option D. -> 150 ohm
Question 223. The equivalent of 1 kV is:
  1.    None of these
  2.    1000 V
  3.    100 mV
  4.    1.00 V
  5.    1000 mV
 Discuss Question
Answer: Option B. -> 1000 V
Question 224. Which one of the following principles best describes the basic operation of a generator?
  1.    Like magnetic poles attract; unlike poles repel
  2.    Like magnetic poles repel; unlike poles attract
  3.    Current flowing through a conductor generates a magnetic field
  4.    None of these
  5.    Current is induced in a conductor that is moving through a magnetic field
 Discuss Question
Answer: Option E. -> Current is induced in a conductor that is moving through a magnetic field
Question 225. The current gain of a transistor is defined as the ratio of the collector current to the
  1.    None of these
  2.    supply current
  3.    emitter current
  4.    base current
  5.    collector current
 Discuss Question
Answer: Option D. -> base current
Question 226. The period of a waveform is:
  1.    the time required for the voltage to rise from 10% to 90% of the peak amplitude
  2.    None of these
  3.    the time required to complete one full cycle
  4.    equal to 0.707 times the peak amplitude
  5.    the number of cycles completed in one second
 Discuss Question
Answer: Option C. -> the time required to complete one full cycle
Question 227. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
  1.    None of these
  2.    3.75 mA
  3.    3.2 mA
  4.    13 mA
  5.    0.05 mA
 Discuss Question
Answer: Option B. -> 3.75 mA

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