Tables: The three tables that are created to describe the relationship between PAINTER, PAINTING, and GALLERY are shown below. Table Name : “PAINTER” The following are the components of “PAINTER” table, PAINTER NUM PAINTER FNAME PAINTER LNAME PAINTER INITIAL 10014 Artiste Josephine P 10015 Itero Julio G 10016 McDonald Theresa Table Name: “PAINTING” The following are the components of “PAINTING” table, PAINTING NUM PAINTING TITLE PAINTER NUM GALLERY NUMBER 20018 Dawn Thunder 10016 18 20023 Vanilla Roses 10015 18 20041 Tired Flounders 10016 23 ...

Question

Q5-The efficiency of a 200 KVA, single phase transformer is 98% when operating at full load 0.8 lagging p.f. the iron losses in the transformer is 2000 watt. Calculate the i) Full load copper losses ii) half load copper losses and efficiency at half load. Ans: 1265.306 watt, 97.186%

Answer 1

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Chapter 2, Problem 10P

(a)

Explanation of Solution

Tables:

The three tables that are created to describe the relationship between PAINTER, PAINTING, and GALLERY are shown below.

Table Name : “PAINTER”

The following are the components of “PAINTER” table,

PAINTER NUM PAINTER FNAME PAINTER LNAME PAINTER INITIAL

10014 Artiste Josephine P

10015 Itero Julio G

10016 McDonald Theresa

Table Name: “PAINTING”

The following are the components of “PAINTING” table,

...

PAINTING NUM PAINTING TITLE PAINTER NUM GALLERY NUMBER

20018 Dawn Thunder 10016 18

20023 Vanilla Roses 10015 18

20041 Tired Flounders 10016 23

(b)

Explanation of Solution

Relationship between tables:

The relationship between these tables can be described by using a Crow’s Foot ERD.

Crow’s Foot ERD:

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Q5-The efficiency of a 200 KVA, single phase transformer is 98% when operating at full load 0.8 lagging p.f. the iron losses in the transformer is 2000 watt. Calculate the i) Full load copper losses ii) half load copper losses and efficiency at half load. Ans: 1265.306 watt, 97.186%

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