Question

The current gain in transistor in common base mode is 0.99. To change the emitter current by 5 mA, the necessary change in collector will be(a) 0.196 mA(b) 2.45 mA(c) 4.95 mA(d) 5.1 mA

Answer 1

Three- phase AC Regulators

There are many types of circuits used for the three-phase ac regulators (ac to ac voltage converters), unlike single-phase ones. The three-phase loads (balanced) are connected in star or delta. Two thyristors connected back to back, or a triac, is used for each phase in most of the circuits as described. Two circuits are first taken up, both with balanced resistive (R) load

Answer 2

Answer:

4.95mA

Explanation:

Current gain in transistor in common base mode = a = 0.99 (Given)

Current emitter change = Ie = 5mA (Given)

Current gain -

α =Ic / Ie ,

where 'Ic' is the current through the collector and ' Ie' is the current through emitter

Thus, α = 0.99 and Ie = 5mA

Therefore,

Ic = α x Ie

Ic = 0.99 × 5mA

Ic = 4.95

Thus, the necessary change in collector will be 4.95mA