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সুইচ গিয়ার এন্ড প্রটেকশন MCQ
141. Which device is used for protection of equipment from damage caused by overload or short circuit?
CVT
Circuit breaker
Current transformer
Lightning arrester
142. A fuse wire is made of-
Copper
Tungsten
Nichrome
Lead-tin alloy
ব‍্যাখ্যা: A fuse wire is made of lead-tin alloy as they have low melting point as well as they have high resistance.
143. Lightning arrester is used for-
Protection of equipment from external lightning
Protection of equipment from short circuits
Protection of equipment from open circuits
All of the above
144. MCB stands for-
Miniature Circuit Breaker
Minimum Capacity Breaker
Molded Circuit Breaker
Maximum Capacity Breaker
ব‍্যাখ্যা: MCB of Miniature Circuit Breaker automatically switches off the electrical circuit during an abnormal condinon of the network means in overload condition as well as faulty condition. Now a days we use an MCB in a low voltage electrical network instead of a fuse.