Question

For an NPN transistor connected as shown in below, VBE=0.7V. Give that reverse saturation current of junction at room temperature is 10-13A, the emitter current is_________

(a) 30mA

(b) 39mA

(c) 29mA

(d) 49mA

I have been asked this question by my college director while I was bunking the class.

This interesting question is from Biasing Parameters topic in portion Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Right option is (d) 49mA

To explain I would say: When the collector and base are shorted, the transistor behaves as a normal diode. So, the diode equations imply. IE=IO(e^V/V0-1). We get, IE=49mA.