Which statement given below is false?
Show answer Hide answer
Answer: A. A pale color of petroleum product indicates lower viscosity
Explanation
Color is not a direct indicator of viscosity; pale color indicates refinement rather than low viscosity. Refining processes remove colored impurities and compounds without altering base fluid viscosity. Assuming viscosity based solely on product color is a common misconception in petroleum handling. Petroleum color ranges from water-white in light distillates to black in heavy residual asphalt. Chemical impurities like nitrogen, sulfur, and condensed ring aromatics impart dark colors to oils. Viscosity depends strictly on molecular weight distribution and chemical structure, not hue.
Refineries use color grading to assess the thoroughness of treating and finishing operations. Consumers often misjudge oil quality by color when true performance depends on laboratory tests. Proper lubricant selection requires checking viscosity ratings rather than visual appearance. Color correctly indicates the degree of chemical refinement achieved during processing. Lighter petroleum distillates naturally exhibit lighter colors compared to heavy residual oils. Fluorescence under ultraviolet light helps technicians detect oil adulteration or specific crude sources.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What is the nutrient composition implied by a -10-5 fertilizer rating______________?
Show answer Hide answer
Answer: A. 5, 10, 5% respectively of N2, P2O5 and K2O
Fertilizer grades conventionally indicate the percentage composition of nitrogen, phosphate, and potash respectively. A standard numeric rating provides guaranteed analysis percentages for these three primary plant nutri...
Q2. How does the required number of stages respond when the reflux ratio in a continuous counter-current extraction setup is elevated_______________________?
Show answer Hide answer
Answer: B. Decrease
Increasing the reflux ratio returns more solvent back into the extraction column. This higher internal liquid traffic enriches the counter-current streams and improves separation efficiency. Consequently, fewer equilibri...
Q3. What is the reaction order depicted in the accompanying graphic, characterized by the rate expression -rA = KCA_________________?
Show answer Hide answer
Answer: D. 3
The rate expression convention and matching graphic coefficients determine reaction kinetics order. Complex chemical kinetics models evaluate the overall exponent sum in rate laws. Based on the provided rate expression p...
Q4. As ambient temperature climbs, the atomic heat capacities corresponding to all solid elemental substances_________________?
Show answer Hide answer
Answer: A. Increases
According to the Dulong-Petit law and general thermodynamic behavior, atomic heat capacities increase at high temperatures. Thermal agitation allows lattice atoms to vibrate with greater amplitudes, absorbing more therma...
Q5. How does the internal energy of a substance respond to an increase in temperature___________________?
Show answer Hide answer
Answer: A. Increases
Internal energy represents the total microscopic kinetic and potential energy stored within a given substance. Raising the temperature increases the average translational and rotational kinetic energy of its constituent...
Q6. What is the amount of work performed during the free expansion of a gas____________________?
Show answer Hide answer
Answer: B. Zero
Free expansion involves a gas rushing into an evacuated chamber against zero opposing external pressure. Mechanical work done is defined as the product of external pressure and the resulting volume change. Since external...