If i had tuberculosis. would my doc be able to tell just by listening to lungs?

Not always.: With latent tb, there can be no symptoms at all. You might just have a positive PPD (skin test). With active TB (of the lung), there's still a chance a lung exam could be normal. You would have other symptoms like fevers, coughing, sweats, and an abnormal chest xray.

No: No one could diagnose tuberculosis by listening to lungs alone. The right clinical history and exam could help make the diagnosis. But you would need a culture typically from your sputum sample to grow the bacteria, mycobacterium tuberculosis, for a definitive diagnosis.