Question 254Electricity & Electronics - QMED
70% to passWhat is the name of the DC motor speed control method utilized as shown in figure "B" of the illustration? Illustration EL-0101
ABurmeister-Wain
BAtlas-Copco
CWard-Leonard
DSperry-Rand
AI Explanation
The correct answer is C) Ward-Leonard. The Ward-Leonard method is a speed control system for DC motors that uses a generator and a series-connected field rheostat to control the motor's field current and thereby its speed. This method was commonly used for DC motor speed control in the early to mid-20th century, including in various marine applications like those found on US Coast Guard vessels. The other options are incorrect because they do not refer to a DC motor speed control method. Burmeister-Wain, Atlas-Copco, and Sperry-Rand are the names of companies or products, not the specific speed control technique depicted in the illustration.
Related Questions
Q366:What will happen to a carbon resistor operating in electrical equipment that is ... Q93:How does the resistance of a conductor vary? Q82:What will be the resulting current when a voltage of 115 VDC is applied to a res... Q439:When troubleshooting a magnetic controller, it is found that the contacts are we... Q137:What can be the cause of excessive heat or burning contacts in an operating moto...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources