Protection by fuses is generally not used beyond 100 A .
Answer : The delay fuses are used for the protection of motors.
Answer : H.R.C. fuses provide best protection against short-circuits.
Description : The material used in liquid fuses is (1) SF6 (3) carbon tetra chloride (2) distilled water (4) transformer oil
Answer : The material used in liquid fuses is carbon tetra chloride
Description : What is the advantage of HRC fuses when compared with rewireable fuses?
Answer : Ans.HRC fuses have high rupturing capacity, high speed of operation and no aging effect.
Description : A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Answer : A relay used for protection of motors against overload is : Thermal relay