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সুইচ গিয়ার এন্ড প্রটেকশন MCQ
141. 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
142. Which device is used for protection of equipment from damage caused by overload or short circuit?
CVT
Circuit breaker
Current transformer
Lightning arrester
143. 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.
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.