DEC Infra Interview Questions, Process, and Tips

Critical situations in tower crane erection and commissioning

• Failure to follow manufacturer's instructions

• Inadequate ground preparation

• Lack of proper communication between crane operator and ground personnel

• Adverse weather conditions

• Inadequate training of personnel involved in the erection and commissioning process

The number of leads in sqmm wire depends on the wire gauge and its application.

• The number of leads in a sqmm wire can range from 1 to over 1000 depending on the wire gauge and its application.

• For example, a 1 sqmm wire may have a single lead, while a 1000 sqmm wire may have over 1000 leads.

• The number of leads in a wire can also depend on whether it is a single-core or multi-core wire.

• In general, the larger the wire gau...read more

Sizes of cables and db box are determined by the electrical load and distance of the circuit.

• The size of the cable is determined by the electrical load and the distance of the circuit.

• The size of the distribution board (db) box is determined by the number of circuits and the size of the cables.

• The cable size is usually specified in square millimeters (mm²) or American Wire Gauge (AWG).

• The db box size is usually specifi...read more

Insulation types include solid, liquid, and gas. Examples include rubber, oil, and air.

• Solid insulation includes materials like rubber, plastic, and paper

• Liquid insulation includes materials like oil and transformer oil

• Gas insulation includes materials like air, sulfur hexafluoride, and nitrogen

• Other types of insulation include ceramic, mica, and glass

• Examples of insulation used in electrical equipment include polyethy

Chemical earthing involves the use of chemicals to improve conductivity and reduce soil resistivity.

• Normal earthing involves the use of a metal rod or plate buried in the ground to provide a low resistance path for fault current.

• Chemical earthing involves the use of chemicals such as bentonite, salt, and charcoal to improve conductivity and reduce soil resistivity.

• Chemical earthing is more effective in areas with high ...read more

To improve production and productivity, I would suggest optimizing the production line, implementing automation, and training employees.

• Analyze the current production process and identify bottlenecks

• Implement automation to reduce manual labor and increase efficiency

• Train employees on new technologies and processes to improve their skills

• Regularly monitor and measure production metrics to identify areas for improvement

• I...read more

Minimize labour and product cost without compromising quantity.

• Automate processes to reduce labour cost

• Optimize supply chain to reduce product cost

• Implement lean manufacturing principles

• Negotiate better deals with suppliers

• Reduce waste and improve efficiency

• Invest in technology to improve productivity

• Train employees to improve skills and reduce errors