Question 136Electricity/Electronics - 1st Asst/Chief70% to pass
Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. What statement is true concerning the acceleration of the DC winch motor from base speed to maximum speed at constant horsepower? Illustration EL-0153
AI Explanation
The correct answer is D) With a constant DC generator armature RPM at rated speed and the DC generator field current at maximum, the DC winch motor speed increases with decreased DC motor field current from maximum to minimum.
This is correct because in a Ward-Leonard drive system, the speed of the DC winch motor is controlled by adjusting the DC motor field current. With a constant generator armature speed and maximum generator field current, decreasing the DC motor field current will increase the motor speed, allowing the winch to accelerate from base speed to maximum speed at constant horsepower.
The other options are incorrect because they describe the opposite relationship between motor field current and speed, which is not consistent with the operating principles of a Ward-Leonard drive.
Related Questions
#134 What is the purpose of the capacitor within component "5" of the circuit shown in figure "B" of the illustration? Illustration EL-0081 #135 As shown in the illustration, the change-over switch is what type of device? Illustration EL-0058 #137 Refer to the simplified schematic of the various types of self-excited DC generators shown in the illustration. What is the configuration of figure "B"? Illustration EL-0123 #138 Refer to the simplified schematic of the Ward-Leonard drive system shown in the illustration. What statement is true concerning the acceleration of the DC winch motor from minimum to base speed at constant torque? Illustration EL-0153 #139 The conversion of the throttle command voltage to the signal necessary to achieve the desired shaft RPM is accomplished by what circuit?