Section A
Q1.
(a) Define the American Petroleum Institute (API) unit of gamma radiation, by considering the master calibration of gamma ray tool. Given the bed resolution to be 1 ft and time constant to be 2 s, estimate the logging speed (ft/hr) of a radiation/radioactivity logging tool.
(b) (i) State the reason for not applying elevation correction usually to total magnetic intensity (TMI) data. (ii) State the basic premise of radiocarbon dating method.
(c) State the basic heat flow equation with appropriate units for its entities.
(d) Name any three non-explosive offshore seismic sources and two seismic receivers.
(e) Can we digitize all signals properly ? State your answer with brief justification.
(f) We have a signal with frequencies ranging between 18 kHz and 24 kHz. If we sample this signal such that there would be two replicas of the signal (between -18 kHz and +18 kHz), what should be the sampling frequency(ies) ?
(g) What do you understand by scale of a map ? Out of two maps of the same area having scales (i) 1:2,50,000, and (ii) 1:25,000, which one will be useful for your detailed mapping ? Justify your answer.
(h) What is meant by the term 'FCC' in Remote Sensing ? Why does vegetation always appear red in FCC ?
