Unirail Interview Questions and Answers

Q1. General discussion
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Q1. Demo in our specialist subject
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Q1. General discussion about ourselves.
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Q2. About work experience
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Q1. Basic Question about TDS DEDUCTION IN DIVISION
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Q1. What happens when cable is laid
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When cable is laid, it is typically buried underground or installed overhead to provide electrical or communication connections.
• Cable is typically laid underground in trenches to protect it from damage and exposure to elements.

• Overhead cable installation involves attaching the cable to poles or structures above ground.

• Proper cable laying techniques are essential to ensure safety, reliability, and longevity of the infra
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Q2. What is the logic in railway line
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The logic in railway line involves the efficient movement of trains on tracks to ensure safety and timeliness.
• Railway lines are designed to allow trains to travel from one point to another efficiently.

• Tracks are laid out in a specific pattern to prevent collisions and ensure smooth operation.

• Signals and switches are used to control the movement of trains and prevent accidents.

• Schedules and timetables are created to opt...read more
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Q3. What is track circuit?
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A track circuit is an electrical circuit used to detect the presence of trains on a railway track.
• Track circuits are typically installed along railway tracks to monitor the presence of trains by detecting their axles or wheels.

• They work by sending electrical current through the track and measuring changes in the current flow when a train is present.

• Track circuits are essential for signaling systems to ensure safe opera...read more
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Q4. What is the colour aspect through which the train gets the signal,
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The colour aspect through which the train gets the signal is typically red, yellow, and green.
• Red signal indicates stop

• Yellow signal indicates caution

• Green signal indicates go

• These signals are used in railway traffic control systems
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Q5. Why is route aspect given in home signal?
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Route aspect is given in home signal to indicate the route set for the train to follow.
• Route aspect helps the train operator know which track the train is cleared to proceed on.

• It ensures safe and efficient movement of trains by guiding them along the correct path.

• Different route aspects may indicate different routes or movements available to the train.

• Route aspect is crucial for preventing collisions and ensuring smoo
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Q1. ABOUT YOUR SELF AND EXPERIENCE
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Q1. LAST WORKING AND ABOUT TO NDT TESTING
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Q1. What is polymorphism
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Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.
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Q2. Find missing number from nth number array.
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Find missing number from nth number array.
• Iterate through the array and calculate the sum of all numbers

• Calculate the sum of numbers from 1 to n using the formula n*(n+1)/2

• Subtract the sum of array from the sum of numbers from 1 to n to find the missing number
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Q3. Explain inheritance and it types
Ans. 
Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Inheritance allows a class to reuse code from another class.

• Types of inheritance include single inheritance, where a class inherits from only one parent class, and multiple inheritance, where a class inherits from multiple parent classes.

• Example: Class B inherits from Class A, so Class B can access
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Q4. Find 2nd max elements from aaray
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Find 2nd max element from array of strings
• Sort the array in descending order

• Skip the first element (max element)

• Return the second element
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WENT BAD BY NOW FULLY GREAT

Q1. NEVER BLUFED IF IN "DOUBT" SAID CAN I MAKE A GUSS
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Q2. CALL BY REFERENCE IN C
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Call by reference in C allows a function to modify the actual value of a variable passed as an argument.
• In call by reference, the address of the actual argument is passed to the function.

• Changes made to the parameter inside the function affect the original value outside the function.

• Example: void swap(int *a, int *b) { int temp = *a; *a = *b; *b = temp; }
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