MCQ on Control and Protection 4 1. The acting contacts for circuit breakers are made of: a. stainless steel b. hard press iron c. copper tungsten alloy d. porcelain View Answer 2. A fuse wire should have : a. Low specific resistance and high melting point b. High specific resistance and low melting point c. … Read more
What is A Circuit Breaker? A circuit breaker is equipment that helps to protect the electrical devices from damage during abnormal conditions by interrupting the fault current or short circuit. Its basic function in an electrical path is to detect an abnormal condition and discontinue electrical flow. A circuit breaker is easier to use since … Read more
MCQ on Control and Protection 3 1. For the protection of stator winding of an alternate against internal fault involving ground the relay used is a: A. Biased differential relay B. Directional over-current relay C. Plain impedance relay D. Buchholz relay View Answer 2. The least expensive protection for over current in low-voltage system is: … Read more
1. Relay contacts are normally made up of: a) Silver contactsb) Copper contactsd) Lead contactsc) Aluminum contacts View Answer 2.Sparking between the contacts can be reduced by inserting: a) A capacitor in parallel with the contactsb) A capacitor in series with the contactsc) A resistor in the lined) A reactor in the line View Answer … Read more