The current gain of a bipolar transistor drops at high frequencies because of
A. Transistor capacitances
B. High current effects in the base
C. Parasitic inductive elements
D. The early effect
Answer: Option A
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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
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
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
The gain of a bipolar transistor drops at high frequencies because of the inter-electrode capacitances. It increases the base current of the transistor due to which the current gain (β) reduces. Hence the voltage gain rolls at high frequencies.