Since I am from the same field, not in QA/QC ... en engineer of 3 years experience 5500 QAR take home is not that bad a salary. ( unfortuntely you hold an indian passport , or otherwise that QAR could be changed to EUR). Its called a "white" reservation. Never mind leave it.
Coming to the point if the company is taking care of your accomodation, food and transport, its fine.
some thumb rules
1. Always aim for a min 20% hike from your exisitng salary when u jump.
2. QAR7000 minimum is required if you want to sponsor your family.

NB: Just check the reliability of the company. In your case 6500QAR should be the max. if you are into the construction field as per the current market scenario. Oil and gas , the whole scenario changes.