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We have carried out detailed time-resolved timing analyses of threecataclysmic variables (CVs) namely LS Cam, V902 Mon, and SWIFT J0746.3-1608,using the long-baseline, high-cadence optical photometric data from theTransiting Exoplanet Survey Satellite (TESS). Our analysis of LS Camobservations hints the presence of a superorbital period of $\sim$4.025$\pm$0.007 d along with negative and positive superhump periods of $\sim$3.30 h and 3.70 h, respectively. These results can be explained as aninteraction of nodal and apsidal precession of the accretion disc with orbitalmotion. For the other two sources, V902 Mon and SWIFT J0746.3-1608, we havefound evidence of a beat period of 2387.0$\pm$0.6 s and 2409.5$\pm$0.7 s,respectively, which were not found in earlier studies. Our results presented inthis study indicate the change in the accretion mode during the entireobserving period for both sources. For V902 Mon, an apparent orbital periodderivative of (6.09 $\pm$ 0.60) $\times 10^{-10}$ was also found. Moreover, thesecond harmonic of orbital frequency dominates the power spectrum of SWIFTJ0746.3-1608, suggestive of ellipsoidal modulation of the secondary star.Present analyses suggest that LS Cam could be a superhumping CV whereas V902Mon and SWIFT J0746.3-1608 are likely to be variable disc-overflow accretingintermediate polars.

A Step towards Unveiling the Nature of Three Cataclysmic Variables: LS Cam, V902 Mon, and SWIFT J0746.3-1608