How is this transistor been killed?

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SUMMARY

The discussion centers on the failure of a transistor subjected to three specific tests. Tests 1 and 3, particularly when voltages are applied without current limiting, can lead to transistor damage. Test 3 is identified as the most likely cause of failure due to the absence of current control. The term "pump in correct voltage" refers to connecting the transistor to a supply voltage with low output impedance, which is crucial for understanding the conditions that lead to damage.

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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.
 
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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?
 
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).
 

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