TÜV NORD Inspection Engineer Interview Questions and Answers

Various tests are performed on cables, transformers, and motors to ensure their proper functioning.

• Cables are tested for insulation resistance, continuity, and high voltage.

• Transformers are tested for turns ratio, insulation resistance, and winding resistance.

• Motors are tested for insulation resistance, winding resistance, and no-load and load current.

• Other tests may include temperature rise, partial discharge, and impulse voltage tests.

• Testing is important to ensure safety a...read more

The ratio of M25 concrete is 1:1:2

• The ratio of M25 concrete is 1 part cement, 1 part sand, and 2 parts aggregate

• This ratio is commonly used in construction for medium strength concrete

• For example, to make 1 cubic meter of M25 concrete, you would need 1/4 cubic meters of cement, 1/4 cubic meters of sand, and 1/2 cubic meters of aggregate

The testing standard for ball valves is API 598.

• API 598 is the widely accepted testing standard for ball valves.

• It includes tests for seat leakage, shell leakage, closure tightness, and pressure testing.

• API 598 also specifies acceptance criteria for each test.

• Other standards like API 6D and ASME B16.34 may also be applicable depending on the valve type and application.

Concrete cube mould tolerance refers to the acceptable range of dimensions for the mould used to cast concrete cubes for testing.

• Concrete cube mould tolerance is typically around +/- 1mm for most standard moulds.

• Tolerance may vary depending on the specific standards or specifications being followed.

• It is important to ensure that the mould used meets the required tolerance to ensure accurate test results.

• Examples of concrete cube mould tolerances: 150mm x 150mm x 150mm cube mo...read more

The maximum concrete pouring height depends on various factors such as the type of concrete, formwork design, and weather conditions.

• Maximum concrete pouring height for normal concrete is typically around 1.5 to 2 meters.

• For high-performance concrete, the maximum pouring height may be reduced to around 1 meter.

• Factors such as formwork stability, concrete mix design, and weather conditions can affect the maximum pouring height.

• Using a pump or tremie method can allow for pourin...read more

The 7 QC tools are basic statistical tools used for quality control in manufacturing and other industries.

• Check sheets: Used to collect and organize data

• Pareto charts: Used to identify the most frequent problems or defects

• Histograms: Used to show the distribution of data

• Cause-and-effect diagrams: Used to identify the root cause of a problem

• Control charts: Used to monitor a process over time

• Scatter diagrams: Used to show the relationship between two variables

• Flowcharts: Used t...read more