Drishti Flanges & Metal Interview Questions and Answers

I am a graduate engineer trainee with a strong family background. My hobbies include playing guitar and my favorite subject is mechanical engineering.

• I am a graduate engineer trainee

• I come from a strong family background

• My hobbies include playing guitar

• My favorite subject is mechanical engineering

Copper is extracted from ore through several stages including crushing, grinding, and concentration.

• The ore is first crushed into small pieces

• It is then ground to a fine powder

• The powder is then concentrated using various methods such as froth flotation

• The concentrated ore is then roasted to remove any remaining impurities

• Finally, the copper is extracted using electrolysis or smelting

• The final product is usually in the

Electrorefining, electrowinning, and electroplating are all electrochemical processes used for different purposes.

• Electrorefining is used to purify metals through electrolysis, such as copper refining.

• Electrowinning is used to extract metals from their ores through electrolysis, such as zinc production.

• Electroplating is used to coat a metal object with a thin layer of another metal, such as gold plating on jewelry.

• All ...read more

Wire drawing at room temperature is cold working for both steel and tin rods.

• Wire drawing involves pulling a metal rod through a die to reduce its diameter.

• Cold working is a process where the metal is deformed at room temperature.

• Hot working is a process where the metal is deformed at high temperatures.

• Steel and tin rods can be cold worked at room temperature through wire drawing.

• Hot working is typically done at high t...read more

RTD measures temperature using resistance while thermocouple uses voltage difference.

• RTD has higher accuracy and stability than thermocouple.

• RTD is more expensive than thermocouple.

• RTD is suitable for precise temperature measurement while thermocouple is better for high temperature measurement.

• RTD has a linear relationship between resistance and temperature while thermocouple has a non-linear relationship.

• Examples of R...read more

Correct temperature indication by RTD can be verified using multimeter.

• Check the resistance value of RTD using multimeter and compare it with the standard resistance-temperature chart.

• Ensure that the RTD is properly connected to the measuring instrument and there are no loose connections.

• Perform a calibration check periodically to ensure accurate temperature measurement.

• Use a reference thermometer to cross-check the te...read more

Yes, 0-10 V can be used in PLC as an analog input or output signal.

• PLCs typically have analog input and output modules that can handle 0-10 V signals.

• The signal can be used to measure or control variables such as temperature, pressure, or flow.

• The resolution and accuracy of the signal depend on the PLC and the analog module used.

• Some PLCs may require additional scaling or conversion of the signal to match the desired r...read more

Dry wiring refers to wiring without any external protection, while wet wiring involves the use of protective coatings or materials.

• Dry wiring is typically used in low-risk environments where there is no chance of moisture or other contaminants damaging the wiring.

• Wet wiring is used in high-risk environments where moisture or other contaminants are present, such as in chemical plants or outdoor installations.

• Examples of...read more

Power factor is a measure of how efficiently electrical power is being used. To maintain a power factor of 0.80, various measures can be taken.

• Power factor is the ratio of real power (kW) to apparent power (kVA).

• To improve power factor, reactive power should be reduced.

• Installing power factor correction capacitors can help improve power factor.

• Regular maintenance of electrical equipment can prevent power factor degrada...read more

Yes, SiMn slag can be used in various applications such as road construction, cement production, and as a fertilizer.

• SiMn slag can be used as a substitute for sand in road construction.

• It can also be used as a raw material in cement production.

• SiMn slag is rich in nutrients and can be used as a fertilizer.

• It can also be used in the production of bricks and tiles.

• SiMn slag can be used as a source of silicon and manganes...read more

C3 value is a measure of coke formation in a refinery. It should be less than 0.1 wt%.

• C3 value is the weight percentage of coke formed during thermal cracking of petroleum products.

• It is an important parameter to monitor in a refinery as high C3 value can lead to fouling of equipment and reduced efficiency.

• The ideal C3 value is less than 0.1 wt%.

• C3 value can be reduced by optimizing the cracking process and using addit...read more

Reductions and flux are chemical reactions used in metallurgy to extract metals from their ores.

• Reduction is the process of removing oxygen from a metal oxide to obtain the metal.

• Flux is a substance that is added to the ore to lower its melting point and to remove impurities.

• The reaction formula for reduction is: Metal oxide + Carbon → Metal + Carbon dioxide

• The reaction formula for flux is: Impurities + Flux → Slag

• Exam...read more