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Exam Questions Papers - Engineering

Q1:

The figure shown below is designed to act as a constant current source across the load resistor. The β of transistor is 50. What is the value of load current?

A 1.96 mA

B 2 mA

C 2.04 mA

D None

ANS:A - 1.96 mA

Voltage at base = 12 - 5 = 7 v Voltage at emitter = 7 + 0.7 = 7.7 v Current through R1 = 2 mA Thus current through load = = 1.96 mA.