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Q#1
Induction Machines
GATE EE 2023
NAT
+2 marks
-0 marks
A three phase 
, 6-pole, 
squirrel cage induction motor drives a constant torque load at rated speed operating from rated supply and delivering rated output. If the supply voltage and frequency are reduced by 
, the resultant speed of the motor in RPM (neglecting the stator leakage impedance and rotational losses) is _________ (Round off to the nearest integer).
Explanation:
if both voltage & frequency are reduced by 20% then 
Motor drives a constant Torque Load, Ns – Nr = constant f1 = 50 Hz
Ns1 – Nr1 = Ns2 – Nr2
1000 – 960 = 800 – Nr2
Nr2 = 760 rpm
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