10+ Cleantech Industry Resources Interview Questions and Answers

Solar module RM specifications include size, efficiency, material, and warranty.

• Size: Typically ranges from 60 to 72 cells for residential use.

• Efficiency: Higher efficiency modules can convert more sunlight into electricity.

• Material: Most common materials include monocrystalline silicon, polycrystalline silicon, and thin-film.

• Warranty: Usually comes with a warranty ranging from 20 to 25 years.

Reliability testing procedures for solar modules according to IEC standards involve various tests to ensure durability and performance.

• IEC 61215 and IEC 61646 are the standards for reliability testing of crystalline silicon and thin-film solar modules, respectively.

• Tests include thermal cycling, damp heat, humidity freeze, mechanical load, and UV exposure.

• These tests simulate harsh environmental conditions to assess the long-term performance and reliability of solar modules.

• R...read more

Solar cells are devices that convert sunlight into electricity, while solar modules are made up of multiple solar cells connected together.

• Solar cells are typically made of silicon and other materials that can generate electricity when exposed to sunlight

• Solar modules, also known as solar panels, are made up of multiple solar cells connected together to increase the amount of electricity generated

• Solar cells and modules are used in solar energy systems to generate clean and r...read more

The parts of an inverter include DC input, power transistors, transformer, output filter, and control circuit.

• DC input: where the direct current is supplied to the inverter

• Power transistors: responsible for converting DC to AC

• Transformer: used to step up or step down the voltage

• Output filter: smoothens the output waveform

• Control circuit: manages the operation of the inverter

Optimize moisture content refers to adjusting the amount of moisture in a material to achieve the desired properties.

• Optimizing moisture content involves finding the right balance to enhance the quality and performance of a material.

• It is important in industries like agriculture, food processing, and construction.

• For example, in agriculture, optimizing moisture content in soil can improve crop growth and yield.

Eva and Poe are two different costing methods used in accounting.

• Eva costing is based on the assumption that all costs are variable, while Poe costing separates costs into fixed and variable components.

• Eva costing is simpler and easier to implement, while Poe costing provides a more accurate representation of costs.

• Example: Eva costing would allocate the entire cost of a production run to the units produced, while Poe costing would allocate some costs as fixed overhead.

• Exampl...read more

The formula for radiation of the day is based on the Stefan-Boltzmann law, which states that the total energy radiated per unit surface area of a black body is directly proportional to the fourth power of the body's absolute temperature.

• Radiation of the day is calculated using the Stefan-Boltzmann law: P = σAT^4

• P represents the power radiated per unit area, σ is the Stefan-Boltzmann constant, A is the surface area, and T is the absolute temperature

• The formula shows that the r...read more

Types of cement include Portland cement, white cement, rapid hardening cement, and low heat cement.

• Portland cement is the most common type used in construction.

• White cement is used for architectural purposes and to create colored concrete.

• Rapid hardening cement sets quickly and is used in projects with tight deadlines.

• Low heat cement generates less heat during hydration and is used in large concrete structures.

Resistance is the opposition to the flow of electric current, while resistivity is the inherent property of a material to resist the flow of electric current.

• Resistance is a measure of how much a material or component impedes the flow of electric current.

• It is measured in ohms (Ω) and depends on the physical dimensions and properties of the material.

• Resistivity, on the other hand, is an intrinsic property of a material that determines how strongly it resists the flow of elect...read more