\begin{tabular}{|l|l|}
Q.16 & $\begin{array}{l}\text { A } 10-\text { pole, } 50 \mathrm{~Hz}, 240 \mathrm{~V} \text {, single phase induction motor runs at } 540 \mathrm{RPM} \text { while driving } \\
\text { rated load. The frequency of induced rotor currents due to backward field is }\end{array}$ \\
\hline
- & $100 \mathrm{~Hz}$ \\
\hline - & $95 \mathrm{~Hz}$ \\
\hline - & $10 \mathrm{~Hz}$ \\
\hline - & $5 \mathrm{~Hz}$ \\
\hline
\end{tabular}