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Q#1
DC Machines
GATE EE 2025
MCQ
+2 marks
-0.66 marks
A DC series motor with negligible series resistance is running at a certain speed driving a load, where the load torque varies as cube of the speed. The motor is fed from a 400 V DC source and draws 40 A armature current. Assume linear magnetic circuit. The external resistance, in 
, that must be connected in series with the armature to reduce the speed of the motor by half, is closest to
23.28
4.82
46.7
0
Explanation:
Given: 
,
Series resistance, 
Load Torque, 
In 
series motor, 
….(i)
…(ii)
…(iii)
Under balance condition, 
From eq (iii), 
On Solving, 
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