20+ DRN Infrastructure Interview Questions and Answers

The least count of a vernier caliper can be found by dividing the smallest division on the main scale by the total number of divisions on the vernier scale.

• Divide the smallest division on the main scale by the total number of divisions on the vernier scale

• Example: If the smallest division on the main scale is 0.1 mm and there are 10 divisions on the vernier scale, the least count would be 0.1 mm / 10 = 0.01 mm

PPM stands for parts per million, a unit of measurement used to express very small concentrations of substances in a mixture.

• PPM is calculated as (mass of solute / total mass of solution) * 1,000,000

• For example, if a solution contains 5 grams of solute in 10,000 grams of solution, the PPM would be (5 / 10,000) * 1,000,000 = 500 PPM

• PPM is commonly used in various industries such as manufacturing, environmental monitoring, and quality control

Miniature Circuit Breaker (MCB) is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions.

• Single Pole MCB

• Double Pole MCB

• Triple Pole MCB

• Four Pole MCB

• Miniature Circuit Breaker with Overcurrent Protection (MCBO)

• Residual Current Circuit Breaker with Overcurrent Protection (RCBO)

ACB stands for Air Circuit Breaker, which is a type of circuit breaker that operates in the air as an arc extinguishing medium.

• ACB is used to protect electrical circuits from overloads and short circuits by automatically disconnecting the power supply when a fault is detected.

• It consists of a set of contacts that open and close to interrupt or allow the flow of current.

• ACBs are commonly used in industrial and commercial applications to protect electrical equipment and machine...read more

Weight can be calculated by multiplying the mass of an object by the acceleration due to gravity.

• Weight = mass x acceleration due to gravity

• The standard acceleration due to gravity on Earth is 9.81 m/s^2

• For example, the weight of a 10 kg object on Earth would be 10 kg x 9.81 m/s^2 = 98.1 N

PPM (Parts Per Million) is calculated by dividing the number of defective units by the total number of units produced, then multiplying by one million.

• Calculate the number of defective units.

• Calculate the total number of units produced.

• Divide the number of defective units by the total number of units produced.

• Multiply the result by one million to get the PPM value.

CNC machines can have 3, 4, or 5 axis depending on the complexity of the machine.

• CNC machines use axes to control the movement of the cutting tool.

• 3-axis machines can move the tool in the X, Y, and Z directions.

• 4-axis machines can also rotate the tool around the X-axis.

• 5-axis machines can tilt the tool and rotate it around the Y and Z axes.

• The number of axes determines the complexity of the machine and the types of cuts it can make.

Long term target is a goal or objective that an individual or organization aims to achieve over an extended period of time.

• Long term targets are typically set for a period of 3-5 years or more.

• They are strategic in nature and require careful planning and execution.

• Examples of long term targets include increasing market share by 10%, expanding into new markets, or achieving a certain level of revenue growth.

• Long term targets help provide direction and focus for the organizatio...read more

GD&T stands for Geometric Dimensioning and Tolerancing.

• GD&T is a system used to define and communicate engineering tolerances and specifications.

• It uses symbols and annotations to convey information about the size, shape, orientation, and location of features on a part.

• GD&T is commonly used in manufacturing and engineering industries to ensure that parts are produced to the correct specifications.

• Examples of GD&T symbols include concentricity, perpendicularity, and position.

• G...read more

QA focuses on preventing defects in the process, while QC focuses on identifying defects in the product.

• QA is process oriented, focusing on preventing defects by implementing processes and standards.

• QC is product oriented, focusing on identifying defects through inspections and testing.

• QA involves activities like process audits, training, and documentation.

• QC involves activities like product inspections, testing, and sampling.

• Example: QA would involve setting up a checklist f...read more

The one tenth rule of quality states that a defect rate of 1% is considered acceptable in most industries.

• Defect rate of 1% is generally considered acceptable in industries

• Used as a benchmark for quality control

• Helps in setting quality standards and goals