engineering recuitment HPCL Junior Executive 2025 Mock Test Electrical Machines DC Motor Voltage Equation of DC Motor
At steady-state characteristics of a DC series motor, which of the following statements are correct?
I) The speed-torque relationship of a DC series motor is non-linear.
II) Both the armature current and the field current of a DC series motor decrease with increasing load torque.
III) The efficiency of a DC series motor is generally higher compared to DC shunt motor.
IV) The efficiency of a DC series motor is generally lower compared to DC shunt motor.
1
Statements I, II and IV are correct
2
Only statements I and IV are correct
3
Statements I, II and III correct
4
Only statements I and III are correct