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MCQs

Total Questions : 257 | Page 1 of 26 pages
Question 1.  When transistors are used in digital circuits they usually operate in the:
  1.    active region
  2.    breakdown region
  3.    saturation and cutoff regions
  4.    linear region
 Discuss Question
Answer: Option C. -> saturation and cutoff regions
Question 2.  A transistor has a mca12_1001a1.gif of 250 and a base current, IB, of 20 mu.gif A. The collector current, IC, equals:
  1.    500 mu.gif A
  2.    5 mA
  3.    50 mA
  4.    5 A
 Discuss Question
Answer: Option B. -> 5 mA
Question 3.  Three different Q points are shown on a dc load line. The upper Q point represents the:
  1.    minimum current gain
  2.    intermediate current gain
  3.    maximum current gain
  4.    cutoff point
 Discuss Question
Answer: Option C. -> maximum current gain
Question 4.  Voltage-divider bias provides:
  1.    an unstable Q point
  2.    a stable Q point
  3.    a Q point that easily varies with changes in the transistor's current gain
  4.    a Q point that is stable and easily varies with changes in the transistor’s current gain
 Discuss Question
Answer: Option B. -> a stable Q point
Question 5.  A current ratio of IC/IE is usually less than one and is called:
  1.    beta
  2.    theta
  3.    alpha
  4.    omega
 Discuss Question
Answer: Option C. -> alpha
Question 6.  In a C-E configuration, an emitter resistor is used for:
  1.    stabilization
  2.    ac signal bypass
  3.    collector bias
  4.    higher gain
 Discuss Question
Answer: Option A. -> stabilization
Question 7.  With the positive probe on an NPN base, an ohmmeter reading between the other transistor terminals should be:
  1.    open
  2.    infinite
  3.    low resistance
  4.    high resistance
 Discuss Question
Answer: Option C. -> low resistance
Question 8.  
To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?
  1.    collector-emitter
  2.    base-collector
  3.    base-emitter
  4.    collector-base
 Discuss Question
Answer: Option D. -> collector-base
Question 9.  The ends of a load line drawn on a family of curves determine:
  1.    saturation and cutoff
  2.    the operating point
  3.    the power curve
  4.    the amplification factor
 Discuss Question
Answer: Option A. -> saturation and cutoff
Question 10. . If VCC = +18 V, voltage-divider resistor R1 is 4.7 komega.gif, and R2 is 1500omega.gif, what is the base bias voltage?
  1.    8.70 V
  2.    4.35 V
  3.    2.90 V
  4.    0.7 V
 Discuss Question
Answer: Option B. -> 4.35 V

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