Consider a separately-excited DC motor with an armature resistance RA=0.08 22 and terminal voltage Vr= 115...

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Consider a separately-excited DC motor with an armature resistance RA=0.08 22 and terminal voltage Vr= 115 V. The motor rated speed is 1800 RPM. The field winding supply VF = 24 V and the total field resistance 48 Q2. Assume No armature reaction in this machine. The variation of the armature terminal voltage as a function of the field current is measured under no-load conditions and shown below: IF (A) 0.0 EA (V) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 30 60 85 102 115 125 132 137 140 141 These values were taken at speed n= 1800 RPM If the motor is driving a load at an armature current IA = 60 A, its rotational speed is 1587 RPM, with rotational losses of 700 Watt. Find the efficiency of this motor. Select one: a. % Efficiency = 74.5 % b. % Efficiency = 85.5 % C. None O d. % Efficiency = 91.2 % ? Consider a separately-excited DC motor with an armature resistance RA=0.08 22 and terminal voltage Vr= 115 V. The motor rated speed is 1800 RPM. The field winding supply VF = 24 V and the total field resistance 48 Q2. Assume No armature reaction in this machine. The variation of the armature terminal voltage as a function of the field current is measured under no-load conditions and shown below: IF (A) 0.0 EA (V) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 30 60 85 102 115 125 132 137 140 141 These values were taken at speed n= 1800 RPM If the motor is driving a load at an armature current IA = 60 A, its rotational speed is 1587 RPM, with rotational losses of 700 Watt. Find the efficiency of this motor. Select one: a. % Efficiency = 74.5 % b. % Efficiency = 85.5 % C. None O d. % Efficiency = 91.2 % ?

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