When the circuit is switched on, one of the transistor will be more conducting than the other due imbalance in the circuit or difference in the parameters of the transistor. The OFF time of transistor is determined by RC time constant. When one transistor is ON the other will be OFF. So in the above circuit when a transistor is in OFF state its collector will have the voltage Vcc and when it is ON its collector will be grounded. But when it is OFF they acts as open circuit. When a transistor is ON, its collector and emitter act as a short circuit. Please do read the article Transistor as A Switch. In the above diagram we can find two transistors which is wired as a switch.
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