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Q#1
DC Machines
GATE EE 2023
NAT
+1 mark
-0 marks
A separately excited DC motor rated 
A, 1500 RPM drives a constant torque load at rated speed operating from 
supply drawing rated current. The armature resistance is 1.2Ω . If the supply voltage drops by 
with field current unaltered then the resultant speed of the motor in RPM is __________ (Round off to the nearest integer).
Explanation:
Load to constant torque T = constant
Under rated condition
E1 = Vt – Iara = 400 – 15 × 1.2 = 382 V
Since motor is separately excited φ = constant
When supply voltage is reduced by 10%
∴ T = constant
if φ = constant Ia = constant for constant torque
∴ Ia = 15A
N2 = 1343 rpm
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