## Lakshya Education MCQs

Question: 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
Options:
 A. fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz B. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz C. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz D. fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

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## More Questions on This Topic :

Question 1. 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
Question 2. Negative feedback in an amplifier
1.     Reduces gain
2.     Increase frequency &phase distortion
3.     Reduces bandwidth
4.     Increases noise
Question 3. Which of the following is not associated with a p-n junction
1.     Junction capacitance
2.     Charge storage capacitance
3.     Depletion capacitance
4.     Channel length modulation
Question 4. Which of the following is not associated with a p-n junction
1.     Junction capacitance
2.     Charge storage capacitance
3.     Depletion capacitance
4.     Channel length modulation
Question 5. 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
Explanation :
Question 6. Which of the following is not associated with a p-n junction
1.     Junction capacitance
2.     Charge storage capacitance
3.     Depletion capacitance
4.     Channel length modulation