Transistor Circuit help

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jani jani

Joined Nov 2, 2015
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Can someone help me with this
Transistor Circuit problem thanks in advance

The question can be found here:
http://postimg.org/image/zddyfi17p/

Thanks in advance

I'd done A, but no idea about b,c and d. I've tried looking for 4 hours now but still no luck.
 

Dodgydave

Joined Jun 22, 2012
8,375
The transistors are used as switches,

base / emmiter voltage is approx 0.7V for silicon, gate voltage -5v,

the diode is for back emf suppression from the relay.
 
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