MCCB Circuit Breakers

Molded Case Circuit Breakers or MCCB circuit breakers are black plastic–cased automatic switches. They are designed to primarily protect insulating materials from overheating. Molded case circuit breakers (MCCB) are by far the most commonly used breakers in residential, commercial, and industrial facilities. When an MCCB has opened (or “tripped”) to protect the circuit, it can …

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Measuring Instruments Objective Type Questions

1. An ammeter is …………… instrument. (i) an indicating (ii) an integrating (iii) a recording (iv) none of the above 2. The controlling torque of an indicating instrument ………. as the deflection of the moving system increases. (i) remains unchanged (ii) decreases (iii) increases (iv) none of the above 3. When the pointer of an …

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