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Universal Automation Systems Interview Questions and Answers

Updated 5 Feb 2024
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Q1. Why petrol engines comparison ratio low when compared to a diesel engine

Ans.

Petrol engines have lower compression ratios compared to diesel engines.

  • Petrol engines have lower compression ratios to prevent knocking or detonation.

  • Diesel engines have higher compression ratios to ignite the fuel without spark plugs.

  • Higher compression ratios in diesel engines result in better fuel efficiency and torque.

  • Petrol engines require lower compression ratios to accommodate the lower octane rating of petrol fuel.

  • Lower compression ratios in petrol engines allow for s...read more

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Q2. Different between petrol engine and Diesel engine?

Ans.

Petrol engines use spark ignition while diesel engines use compression ignition.

  • Petrol engines use spark plugs to ignite the fuel-air mixture, while diesel engines rely on compression to ignite the fuel.

  • Petrol engines have a higher power-to-weight ratio compared to diesel engines.

  • Diesel engines are more fuel-efficient than petrol engines.

  • Petrol engines are typically used in cars, motorcycles, and small vehicles, while diesel engines are commonly found in trucks, buses, and he...read more

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Q3. Verniers caliper list count and micrometer list count?

Ans.

Vernier calipers and micrometers are precision measuring tools used in mechanical engineering.

  • Vernier calipers are used to measure dimensions with high accuracy, typically up to 0.02 mm.

  • Micrometers are used for even more precise measurements, typically up to 0.001 mm.

  • Both tools are commonly used in mechanical engineering for dimensional inspection and quality control.

  • Vernier calipers have a sliding scale and a main scale, while micrometers have a screw mechanism for measureme...read more

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Q4. How does a diesel genrator work?

Ans.

A diesel generator works by converting diesel fuel into mechanical energy which is then converted into electrical energy.

  • Diesel fuel is injected into the combustion chamber where it ignites and creates high pressure gases that push the piston down, creating mechanical energy.

  • The mechanical energy is then converted into electrical energy through the use of an alternator.

  • The alternator uses a magnetic field and a conductor to generate an electrical current.

  • The electrical curren...read more

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Q5. Why there is no differential in a train

Ans.

A train doesn't need a differential because its wheels are fixed to the same axle and rotate at the same speed.

  • Train wheels are fixed to the same axle

  • Wheels rotate at the same speed

  • Differential is used in vehicles with wheels that rotate at different speeds

  • Differential allows for smooth turning

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Q6. What is a function of exel?

Ans.

Excel is a spreadsheet software used for organizing, analyzing and manipulating data.

  • Excel allows users to create tables, charts, and graphs to represent data visually.

  • It can perform complex calculations and analysis on large sets of data.

  • Excel can be used for budgeting, financial analysis, project management, and more.

  • It also has features for data validation, sorting, filtering, and conditional formatting.

  • Excel can import and export data from other software applications.

  • Exam...read more

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Q7. How a diesel engine works

Ans.

A diesel engine works by compressing air in the cylinder, which heats up and ignites the fuel injected into the cylinder.

  • Air is drawn into the cylinder and compressed by the piston

  • The compressed air heats up and ignites the fuel injected into the cylinder

  • The explosion pushes the piston down, which turns the crankshaft and powers the engine

  • Diesel engines are more efficient than gasoline engines because they compress the air instead of relying on a spark to ignite the fuel

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