Step 1: Wax formation is the most common issue in offshore pipelines as it precipitates when the temperature drops below the wax appearance point.
Step 2: Char is a product of incomplete combustion, while hydrates form in the presence of water and gas, but it is not typically associated with pipeline blockages.
Step 3: Asphaltenes can precipitate, but they do not usually cause pipeline blockages.
Thus, the correct answer is (A) Wax.
Four curves designated as I, II, III, and IV are shown in the figure. \( P_b \) is the bubble point pressure of a crude oil at the given temperature. Which ONE of the following options correctly depicts the solubility of asphaltene (\( q_a \)) in the crude oil with pressure (\( P \)) at a given temperature?

Four curves designated as I, II, III, and IV are shown in the figure. \( q_f \) is the bottomhole oil flow rate, \( q_s \) is the surface oil flow rate, and \( B_o \) is the oil formation volume factor. Which ONE of the following curves depicts the minimum wellbore storage effect?

Match the entries in GROUP I with the entries in GROUP II.

Which ONE of the following options is CORRECT?
Figure shows an inextensible catenary mooring cable in still water. The submerged weight (per meter length), and the anchor radius are 100 kg/m and 50 m, respectively. If horizontal tension ($T_h$) in the catenary is 1600 kg, the catenary length (AB) is ............. m (rounded to two decimal places). 