Can foreign key be null?

438

Logic using 1 kV or 1,1 kV grade in house wiring Low voltage cable. Explain/suggest? some use 1kV and some prefer 1.1kV grade insulation low voltage cable why??

1609

What is json validator?

1

When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

2109

What is an operator?

1038

Mark the differences between html tags and strut specific html tags.

945

What is pagecontext jsp?

939

can you use iim for installing application server 8 over system i?

948

What is method in java with example?

913

What is a transaction and why is it important?

1029

Hi friends I want to know about what r the dimensions in the banking porjects and genarally how many tables r in project ?

1861

Is orm faster than sql?

298

Does the archiving of hive tables give any space saving in hdfs?

872

why do not u try to get job in your core side(example :-eee)?

1478

What are virtual machine scale sets in Azure?

555