Mechanical Basic Interview Question and Answer-2020

Question Number 1: What is Mechanical Engineering?

Answer:

Technically, mechanical engineering is the application of the principles and problem-solving techniques of engineering from design to manufacturing to the marketplace for any object. Mechanical engineers analyze their work using the principles of motion, energy, and force ensuring that designs function safely, efficiently, and reliably, all at a competitive cost.

Question Number 2: What is the difference between machine and engine?

Answer: The main difference between machine & engine are:

In Machine:-
-Machine is an apparatus used for the generation of mechanical power. It has many parts, each with a definite function, together performing a particular task.

- Machine is a static device.

- Machine comprises of engine as one of its parts.

- Machine is the assembly of desired equipment’s.

- Machine transforms one form of energy into a different product including, but not limited to, another form of energy work.
In ENGINE:-

-Engine is a machine with moving parts that converts power into motion.
-Engine runs the machine.
-Engine is the heart of the machine, due to which the machine works.
-Engine is one type of machine.
-Engine transforms one form of energy into another form of energy.

Question Number 3: What is the difference between the turbine and the pump?

Answer:

The turbine extracts the energy carried by a fluid (usually enthalpy energy as in steam power plants, or potential energy an in turbines installed on water falls) through its impeller blades and transforms it to a useful mechanical energy.

The pump adds energy to a liquid fluid by transforming mechanical energy (kinetic energy of the rotation of the pump impeller) into a fluid kinetic and enthalpy energy. In other words, a pump increases the flow rate of a liquid fluid.

Question Number 4: What is the difference between the heat engine & heat pump?

Answer: Heat Engine produces work and transfers energy from high temp. to low temp source medium. In a Heat pump, external work is needed to transfer energy from low to high temp Medium.

On the other hand when the device operates around a cycle in clockwise direction transforming heat to mechanical energy, we call it heat engine and when it operates around the same cycle in anti-clockwise direction transforming mechanical energy to heat, we call it heat pump.

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