Question 113Electricity & Electronics - QMED
70% to passIf a DC motor runs hot, what would most likely be the cause?
Aan open in the series field
Bclogged ventilation ducts
Clow ambient temperature
Dundercut mica condition
AI Explanation
The correct answer is B) clogged ventilation ducts. If a DC motor runs hot, the most likely cause is clogged ventilation ducts, which prevent proper airflow and cooling of the motor. Insufficient cooling can cause the motor to overheat and run hot. The other options are incorrect - an open in the series field (A) would cause the motor to stop running, low ambient temperature (C) would not make the motor run hot, and an undercut mica condition (D) would not directly cause overheating.
Related Questions
Q496:By what means does a molded-case circuit breaker provide protection against shor... Q346:Which of the following statements represents the important factor that must be c... Q93:How does the resistance of a conductor vary? Q145:A single-phase capacitor-start induction motor starts, comes up to about 75% rat... Q262:What is a bus disconnect link used to isolate?
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources