Question 372Electricity & Electronics - QMED
70% to passThe setpoint current at which a magnetic-type overload relay tends to trip may be increased by turning the dashpot in the 'lower' direction. What effect will this action have?
Aincreases magnetic force on the plunger and requires more current to trip the relay
Breduces magnetic force on the plunger and requires more current to trip the relay
Cincreases magnetic force on the plunger and requires less current to trip the relay
Dreduces magnetic force on the plunger and requires less current to trip the relay
AI Explanation
The correct answer is B) reduces magnetic force on the plunger and requires more current to trip the relay. Turning the dashpot in the 'lower' direction reduces the magnetic force on the plunger of a magnetic-type overload relay. This in turn increases the setpoint current at which the relay will trip, meaning more current is required to activate the overload protection. The other options are incorrect because increasing the magnetic force (options A and C) would make the relay trip at a lower current, not higher. Reducing the magnetic force and requiring less current to trip the relay (option D) is the opposite of what turning the dashpot 'lower' would do.
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