DAT Interview Questions and Answers for Freshers

CNC and DNC are technologies used in manufacturing to control machines through computer programs.

• CNC stands for Computer Numerical Control and involves the automation of machine tools through computer programs.

• DNC stands for Direct Numerical Control and allows multiple CNC machines to be controlled by a single computer.

• CNC machines follow instructions from CAD/CAM software to cut and shape materials like metal, wood, or plastic.

• DNC systems enable centralized control and monit...read more

Offsets in CNC machining are used to adjust tool paths and compensate for tool wear or material variations.

• Offsets are typically set in the CNC machine's control software, allowing for adjustments to be made without changing the actual program code.

• Common types of offsets include tool length offsets, tool radius offsets, and workpiece offsets.

• Offsets can be positive or negative values, depending on the direction of adjustment needed.

• For example, a tool length offset might be ...read more

Negative current is the flow of electrons in the opposite direction of conventional current, while positive current is the flow of electrons in the same direction as conventional current.

• Negative current involves the movement of electrons from the negative terminal to the positive terminal of a power source.

• Positive current involves the movement of electrons from the positive terminal to the negative terminal of a power source.

• In a circuit, negative current is represented by ...read more

Refrigerate means to cool or preserve food or other items at a low temperature.

• Refrigerate is the process of storing food or other items in a refrigerator or other cold storage to keep them fresh and prevent spoilage.

• Examples of items that need to be refrigerated include dairy products, meats, fruits, and vegetables.

• Refrigeration slows down the growth of bacteria and other microorganisms that can cause food to spoil.

• It is important to follow proper refrigeration guidelines to...read more

R-134a is a commonly used refrigerant in air conditioning and refrigeration systems.

• R-134a is a hydrofluorocarbon (HFC) refrigerant.

• It has a low global warming potential (GWP) and ozone depletion potential (ODP).

• R-134a is non-toxic and non-flammable.

• It is used in automotive air conditioning systems, commercial refrigeration, and heat pumps.

• Other refrigerants include R-410A, R-22, and R-404A.