\begin{tabular}{|l|l|}
\hline Q.23 & $\begin{array}{l}\text { Spray dryers have many advantages. Which one of the following is NOT an } \\
\text { advantage of a typical spray dryer? }\end{array}$ \\
\hline & \\
\hline
- & Has short drying time \\
\hline - & Produces hollow spherical particles \\
\hline - & Has high heat efficiency \\
\hline - & Is suitable for heat sensitive materials \\
\hline
\end{tabular}