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H.R.C. fuse, as compared to a rewirable fuse, has no ageing effect, high speed of operation, high rupturing capacity.

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Description : ln HRC fuse the time between cut-off and final current zero is called

Answer : ln HRC fuse the time between cut-off and final current zero is called the arcing time

Description : what is HRC fuse?

Answer : HRC (High Rupturing Capacity) fuse HRC fuse is High Rupturing Capacity fuse. At the time of fault it disconnect the circuit very fast. Filling powder is silica sand. No flashover ... speed response Reliable No maintenance CheaperDisadvantages:- We have to replace it manually after each operation.

Answer : H.R.C. fuses provide best protection against short-circuits.

Answer : A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

Answer : The main function of a fuse is to prevent excessive currents.

Description : A fuse wire should have :  (A) Low specific resistance and high melting point (B) Low specific resistance and low melting point (C) High specific resistance and high melting point (D) High specific resistance and low melting point

Answer : A fuse wire should have : High specific resistance and low melting point

Answer : A fuse in a motor circuit provides protection against short-circuit and overload.

Answer : The fuse blows off by melting.

Answer : The fuse rating is expressed in terms of current.

Answer : A fuse is connected in series with circuit.

Answer : The material used for fuse must have low melting point and high specific resistance.

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Answer : An alternator coupled to a hydraulic turbine runs at slow speed, as compared to others.

Answer : When a conductor carries more current on the surface as compared to core, it is due to skin effect.

Description : In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Answer : In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

Description : In an AC. circuit, a low value of kVAR compared with kW indicates?

Answer : In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.

Description : State any two advantages of MCB over Fuse. State the standard specifications of MCB available in the market.  

Answer : Following advantages of MCB over Fuse: 1. No need of replacement of fuse wire. 2. Manually restore of supply is simple. 3. Fault understanding by visual inspection 4. More safe than fuse The standard specifications of ... 6A, 10A,16A,20A, 25A, 30A, 32A, 40A, 50A, 60A and 63A 6. 250V and 450 v

Description : State the material used for making (1) Magnetic Core (2) Fuse element  

Answer : The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire 

Description : Write applications of each of the following:(i) Fuse (ii) MCB (iii) MCCB.

Answer : i) Applications of fuse:  * Used in domestic installations to provide short circuit protection.  * Used in commercial / Industrial installations to provide overload and short circuit protection.  * Used in ...  * Rectifiers panels,  * U.P.S, Electronic equipment,  * Motors,  * Furnaces

Description : Give the function of fuse and switch.

Answer : Functions of fuse:  * To break the circuit under fault condition.  * To provide overcurrent protection to the circuit.  * To provide short circuit protection to the circuit.  * To provide ...  * To make the electric circuit manually.  * To break the electric circuit manually.

Description : What is a fuse ?

Answer :  A Fuse is a protective device which prevent overloading of current in a circuit.

Description :  An H.R.C. fuse is?

Answer :  An H.R.C. fuse is a ceramic body having metal and caps.

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Answer : The X:R ratio of 220 kV line as compared to 400 kV line is smaller.

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Description : Describe the working of HRC fuse with neat diagram.

Answer : Working of HRC Fuse: Under normal conditions, the fuse element is at a temperature below its melting point. Therefore, it carries the normal current without overheating. When a fault ... powder and results in the formation of high resistance substance that helps in quenching the arc. 

Description : Explain construction and characteristics of HRC fuse.

Answer : Construction of H.R.C. Fuse: Figure shows the essential parts of a typical H.R.C. fuse. It mainly consist of a heat resisting ceramic body. Both the ends of the cermaic body consists ... particular circuit and for coordination purpose. A typical Fuse characteristic is shown in figure below. 

Description : Describe the difference between fuse and MCCB.

Answer : Sr. No Fuse MCCB 1 Fuse melts / fuses in case of excessive load. MCCB trips off in case of excessive load. 2 Fuse needs to be replaced after every ... Generally protects the load against short-circuit. Generally protects the load against different types of faults.

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