Sail E0 Webinar

MCQs

Analog Electronics

Total Questions : 482 | Page 1 of 49 pages
Question 1. In a p⁺n junction diode under reverse bias , the magnitude of electric field is maximum at
  1.     The edge of the depletion region on the p-side
  2.     The edge of the depletion region on the n-side
  3.     The p⁺n junction
  4.     The center of the depletion region on the n-side
 Discuss Question
Answer: Option C. ->  The p⁺n junction
Question 2. An npn bjt has gm=38ma/v, cµ =10¯14 f, cπ =10¯13f and dc current gain β0=90.for this transistor ft & fβ are
  1.     fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz
  2.     fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
  3.     fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
  4.     fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
 Discuss Question
Answer: Option B. ->  fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
Question 3. If=0.98, ico=6µa and iβ=100µa for a transistor,then the value of ic will be
  1.     2.3mA
  2.     3.2mA
  3.     4.6mA
  4.     5.2mA
 Discuss Question
Answer: Option D. ->  5.2mA
Explanation :
Question 4. The current gain of a bjt is
  1.     gm r0
  2.     gm / r0
  3.     gm rπ
  4.     gm /rπ
 Discuss Question
Answer: Option C. ->  gm rπ
Question 5. Mosfet can be used as a
  1.     Current controlled capacitor
  2.     Voltage controlled capacitor
  3.     Current controlled inductor
  4.     Voltage controlled inductors
 Discuss Question
Answer: Option B. ->  Voltage controlled capacitor
Question 6. Generally, the gain of a transistor amplifier falls at high frequencies due to the
  1.     Internal Capacitance of the device
  2.     Coupling capacitor at the input
  3.     Skin effect
  4.     Coupling capacitor at the output
 Discuss Question
Answer: Option A. ->  Internal Capacitance of the device
Question 7. The early effect in a bipolar junction transistor is caused by
  1.     Fast turn-on
  2.     Fast turn-off
  3.     Large collector-base reverse bias
  4.     Large emitter-base forward bias
 Discuss Question
Answer: Option C. ->  Large collector-base reverse bias
Question 8. Asource follower using an fet usually has a voltage gain which is
  1.     Greater than +100
  2.     Slightly less than unity but positive
  3.     Exactly unity but negative
  4.     About -10
 Discuss Question
Answer: Option A. ->  Greater than +100
Question 9. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1kΩ & output resistance of 250, are cascaded. the open circuit voltage gain of combined amplifier is
  1.     49dB
  2.     51dB
  3.     98dB
  4.     102dB
 Discuss Question
Answer: Option C. ->  98dB
Question 10. To prevent a dc return between source and load, it is necessary to use
  1.     Resistor between source and load
  2.     Inductor between source and load
  3.     Capacitor between source and load
  4.     Either A or B
 Discuss Question
Answer: Option C. ->  Capacitor between source and load

Latest Videos

Latest Test Papers