Mahindra & Mahindra
Universal Automation Systems Interview Questions and Answers
Q1. Why petrol engines comparison ratio low when compared to a diesel engine
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
Q2. Different between petrol engine and Diesel engine?
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
Q3. Verniers caliper list count and micrometer list count?
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
Q4. How does a diesel genrator work?
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
Q5. Why there is no differential in a train
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
Q6. What is a function of exel?
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
Q7. How a diesel engine works
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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