JE Electrical Question Answer For HPSSC Hamirpur Exam Set-2
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11. An npn BJT has gm=38mA/v, cµ =10¯14 F, cÏ€ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are
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
12. In a CB amplifier the maximum efficiency could be
A. 99%
B. 85%
C. 50%
D. 25%
13. The action of JFET in its equivalent circuit can best be represented as a
A. Current controlled Current source
B. Current controlled voltage source
C. Voltage controlled voltage source
D. voltage controlled current source
14. In a p⁺n junction diode under reverse bias , the magnitude of electric field is maximum at
A. The edge of the depletion region on the p-side
B. The edge of the depletion region on the n-side
C. The p⁺n junction
D. The center of the depletion region on the n-side
15. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ. At the frequency of 4KHZ,the o/p voltage will be
A. 1v
B. 2v
C. 1.4v
D. 2.8v
16. To prevent a DC return between source and load, it is necessary to use
A. Resistor between source and load
B. Inductor between source and load
C. Capacitor between source and load
D. Either A or B
17. Which of the following is not associated with a p-n junction
A. Junction capacitance
B. Charge storage capacitance
C. Depletion capacitance
D. Channel length modulation
18. If=0.98, Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be
A. 2.3mA
B. 3.2mA
C. 4.6mA
D. 5.2mA
19. The cascade amplifier is a multistage configuration of
A. CC-CB
B. CE-CB
C. CB-CC
D. CE-CC
20. Negative feedback in an amplifier
A. Reduces gain
B. Increase frequency &phase distortion
C. Reduces bandwidth
D. Increases noise
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