What are the built in protections provided in 415 V breaker?

What are the built in protections provided in 415 V breaker?  
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1 Answer

Answer :

a. DINF (making current magnetic release)

This consists of a laminated magnetic circuit. This is placed under the lower current terminal pole. This is provided for all the three poles. It has a core that rotates in the air gap. It is held by spring. During protection the magnetic forces developed overcome the spring tension and the core is attracted. The mechanical force developed is used to trip the breaker. This protection acts during the closing of breaker if any fault exists. The current is set to 5 times the rated current. 

b. DIRS (short time magnetic release)

The construction is same as DINF, but it has a mechanical timer, which can be set accordingly. This protection acts when any fault comes during breaker in service. The current rating is set to 3 to 8 times the rated current. 

c. DIT – S (thermal over load protection)

This consists of a three bimetallic strip, which gets heated up when over loaded and trips the breaker by a lever. It is placed in front of the breaker. Setting range is 60% to 100%.  
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Related questions

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Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Description : Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Last Answer : ANSWER: C

Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Description : Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Last Answer : ANSWER: C

Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Description : Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Last Answer : ANSWER: C

Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Description : Highest test partnership by a pair in test cricket history is 415 runs. A. Jayasuriya and Mahnama (SL Vs India) B. Sangakara and Jayawardene (SL Vs SA) C. Neil McKenzie and Gram Smith (SA Vs Bangladesh) D. Trott and Broad (Eng Vs Pak)

Last Answer : ANSWER: C

The compression in steel (fS) at failure for Fe - 415 grade steel using stress-strain curve shall be [ A ] 0.87 fy [ B ] 0.75 fy [ C ] 0.45 fy [ D ] 0.55 fy

Description : The compression in steel (fS) at failure for Fe - 415 grade steel using stress-strain curve shall be [ A ] 0.87 fy [ B ] 0.75 fy [ C ] 0.45 fy [ D ] 0.55 fy

Last Answer : [ B ] 0.75 fy

According to IS: 456-2000 the ultimate moment of resistance of a slab for Fe - 415 HYSD bars is; [ A ] Mu = 0.138 fck bd2 [ B ] Mu = 0.145 fck bd2 [ C ] Mu = 0.152 fck bd2 [ D ] Mu = 0.165 fck bd2

Description : According to IS: 456-2000 the ultimate moment of resistance of a slab for Fe - 415 HYSD bars is; [ A ] Mu = 0.138 fck bd2 [ B ] Mu = 0.145 fck bd2 [ C ] Mu = 0.152 fck bd2 [ D ] Mu = 0.165 fck bd2

Last Answer : [ A ] Mu = 0.138 fck bd2

The Minimum percentage of secondary steel in slabs for Fe- 415 grade steel should be __________ of Gross cross-section area [ A ] 0.12% [ B ] 0.15% [ C ] 0.20% [ D ] 0.25%

Description : The Minimum percentage of secondary steel in slabs for Fe- 415 grade steel should be __________ of Gross cross-section area [ A ] 0.12% [ B ] 0.15% [ C ] 0.20% [ D ] 0.25%

Last Answer : [ A ] 0.12%

For Fe- 415 steel and M20grade concrete, the balanced percentage of steel is [ A ] 0.65% [ B ] 0.75% [ C ] 0.86% [ D ] 0.96%

Description : For Fe- 415 steel and M20grade concrete, the balanced percentage of steel is [ A ] 0.65% [ B ] 0.75% [ C ] 0.86% [ D ] 0.96%

Last Answer : [ D ] 0.96%

The Minimum amount of steel for Main reinforcement in slab should be (Fe 415- grade of steel) [ A ] 0.12 percent of gross cross sectional area [ B ] 0.15 percent of gross cross sectional area [ C ] 0.20 percent of gross cross sectional area [ D ] 0.25 percent of gross cross sectional area.

Description : The Minimum amount of steel for Main reinforcement in slab should be (Fe 415- grade of steel) [ A ] 0.12 percent of gross cross sectional area [ B ] 0.15 percent of gross cross sectional area [ C ] 0.20 percent of gross cross sectional area [ D ] 0.25 percent of gross cross sectional area.

Last Answer : [ A ] 0.12 percent of gross cross sectional area

As per IS: 1139, permissible stress in compression steel reinforcement for High Yield strength deformed bars is [ A ] 140 N/mm2 [ B ] 190 N/mm2 [ C ] 230 N/mm2 [ D ] 415 N/mm2

Description : As per IS: 1139, permissible stress in compression steel reinforcement for High Yield strength deformed bars is [ A ] 140 N/mm2 [ B ] 190 N/mm2 [ C ] 230 N/mm2 [ D ] 415 N/mm2

Last Answer : [ B ] 190 N/mm2

As per IS:1139, the characteristic yield strength for cold twisted deformed bars is [ A ] 250 N/mm2 [ B ] 415 N/mm2 [ C ] 500 N/mm2 [ D ] 550 N/mm2

Description : As per IS:1139, the characteristic yield strength for cold twisted deformed bars is [ A ] 250 N/mm2 [ B ] 415 N/mm2 [ C ] 500 N/mm2 [ D ] 550 N/mm2

Last Answer : [ C ] 500 N/mm2

As per IS:1139, the characteristic yield strength for hot rolled High yield strength deformed bars is [ A ] 250 N/mm2 [ B ] 415 N/mm2 [ C ] 500 N/mm2 [ D ] 550 N/mm2

Description : As per IS:1139, the characteristic yield strength for hot rolled High yield strength deformed bars is [ A ] 250 N/mm2 [ B ] 415 N/mm2 [ C ] 500 N/mm2 [ D ] 550 N/mm2

Last Answer : [ B ] 415 N/mm2

Brother A and B had some savings in the ratio 5:6. They decided to buy a gift for their sister, sharing the cost in the ratio 4:5. After they bought, A is left with three-fourth of his amount, while B is left with Rs.497. Then, the value of the gift is a) 215 b) 115 c) 315 d) 415 e) None of these

Description : Brother A and B had some savings in the ratio 5:6. They decided to buy a gift for their sister, sharing the cost in the ratio 4:5. After they bought, A is left with three-fourth of his amount, while B is left with Rs.497. Then, the value of the gift is a) 215 b) 115 c) 315 d) 415 e) None of these

Last Answer : Answer: C Let the savings of A and B are 5x, 6x and the share cost of gift are 4y, 5y respectively. According to question, For A, 5x-4y=3/4×5x =>x=16y/5 For B, 6x-5y=497 =>6×16y/5-5y=497 =>y=35 Cost of gift=4y+5y=9×35 =315

Which of the following busbar arrangement is generally employed in distribution system: a) One-and-half breaker arrangement b) Main and transfer arrangement c) Ring main distribution system d) Single busbar arrangement system

Description : Which of the following busbar arrangement is generally employed in distribution system: a) One-and-half breaker arrangement b) Main and transfer arrangement c) Ring main distribution system d) Single busbar arrangement system

Last Answer : Ans: C