[Solved] Any device with negative impedance as its characteristic property can be called:

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Q.	Any device with negative impedance as its characteristic property can be called:
A.	energy source
B.	energy sink
C.	oscillator
D.	none of the mentioned
Answer» A. energy source
Explanation: a positive resistance implies energy dissipation while a negative resistance implies an energy source. the negative resistance device used in the microwave oscillator, thus acts as a source. the condition xin+ xl=0 controls the frequency of oscillation. xin is the impedance of the negative resistance device.

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