Spark Engineering Mechanical Engg. Design Interview Questions and Answers

Q1. What Is GD&T,what are the types
Ans. 
GD&T stands for Geometric Dimensioning and Tolerancing, a system for defining and communicating engineering tolerances.
• GD&T is a system used to define and communicate engineering tolerances for design and manufacturing.

• It uses symbols, such as concentricity, flatness, and perpendicularity, to specify geometric characteristics of parts.

• There are different types of GD&T symbols, including form, orientation, profile, and ...read more
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Q2. Why GD&T Required
Ans. 
GD&T is required for clear communication of design intent, ensuring parts are manufactured accurately and consistently.
• GD&T allows for more precise and detailed communication of design requirements compared to traditional dimensioning methods.

• It helps to reduce ambiguity and interpretation errors in engineering drawings.

• GD&T ensures that parts are manufactured accurately and consistently, leading to improved quality an...read more
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Q1. What is the capacity of diesel and petrol
Ans. 
Diesel has higher energy density than petrol, resulting in better fuel efficiency.
• Diesel has a higher energy density than petrol, meaning it can provide more energy per unit volume.

• Petrol is more volatile and burns faster than diesel.

• The capacity of diesel and petrol tanks in vehicles can vary depending on the size of the vehicle and its fuel efficiency.

• For example, a typical car may have a petrol tank capacity of arou...read more
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Q2. Difference b/w petrol engine & diesel engine
Ans. 
Petrol engines use spark ignition, while diesel engines use compression ignition.
• Petrol engines use a spark plug to ignite the fuel-air mixture, while diesel engines rely on compression to ignite the fuel.

• Petrol engines are lighter and more responsive, while diesel engines are more fuel-efficient and have higher torque.

• Petrol engines are more common in cars and motorcycles, while diesel engines are often used in trucks
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Q3. What is meant by LNTD
Ans. 
LNTD stands for Logarithmic Mean Temperature Difference.
• LNTD is a term used in heat transfer calculations to determine the overall temperature difference between two fluids in a heat exchanger.

• It is calculated using the formula LNTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2), where ΔT1 and ΔT2 are the temperature differences at the two ends of the heat exchanger.

• LNTD is important in designing efficient heat exchangers to maximize h...read more
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