\begin{tabular}{|l|l|}
\hline Q.30 & $\begin{array}{l}\text { A separately excited DC motor rated } 400 \mathrm{~V}, 15 \mathrm{~A}, 1500 \mathrm{RPM} \text { drives a constant torque } \\
\text { load at rated speed operating from } 400 \mathrm{~V} \mathrm{DC} \mathrm{supply} \mathrm{drawing} \mathrm{rated} \mathrm{current.} \mathrm{The} \\
\text { armature resistance is } 1.2 \Omega . \text { If the supply voltage drops by } 10 \% \text { with field current } \\
\text { unaltered then the resultant speed of the motor in RPM is } \\
\text { to the nearest integer). }\end{array}$ \\
\hline & (Round off \\
\hline
\end{tabular}