How is this transistor been killed?

[LavennzOsy]

This is a homemade failure and i need to find out how is the transistor damaged after summited to these 3 tests:

test 1. base: pump in correct Vbb
emitter: grounded
collector: open

test 2. base: open
emitter: open
collector: pump in correct Vcc

test 3. base: pump in correct Vbb
emitter: grounded
collector: pump in correct Vcc

Can any1 explain to me how is the transistor damage by these tests.

 

[uart]

Either of tests 1 and 3 could kill it if you just applied voltages without any respect to current levels. Test 3 is the most likely (almost garanteed to) kill it if nothing is provided to limit the current.

BTW. What was the value of Vbb that you used anyway?

 

[turin]

How could test 2 possibly kill it?

I don't understand what is meant by "pump in correct [voltage]". So, I just assume that means connect to some supply voltage (with low output impedance as alluded to by uart).