MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

1.) What is the difference between Fan and Blower?

Ans.Fan is an air pushing device. Either Axial or Centrifugal type systems are used to move the air in low pressure. It is rotated 

by a motor separately.

When the fan is a housing of blades and motor, then it called as Blower. It directs the air in a single path with high pressure.

2.) What is Heat Rate of Power Plant?

Ans.Heat rate is a measure of the turbine efficiency. It is determined from the total energy input supplied to the Turbine divided by the electrical energy output.

3.) What is Hydrodynamic Cavitation?

Ans.Hydrodynamic cavitation describes the process of vaporization in a constrained channel at a specific velocity.

Bubble generation and Bubble implosion which occurs in a flowing liquid as a result of a decrease and subsequent increase in 

pressure.

4.)What is Difference between Hardness and Toughness?

Ans. Toughness is the ability of a material to absorb energy.

Hardness is the ability of a material to withstand wear.

MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

1.)Which is heavier 1kg Cotton or 1kg Iron?

Ans.Both of them have same weight.

2.) What is Auto Dosing?

Ans.Auto dosing is an automated system of feeding the equipment with liquid products. It is the ideal way to ensure the correct calibrated dose at the right time every time in auto.

3.)What is the difference between Sudden Force and Impact Force?

Ans.An impact is a high force or shock applied over a short time period when two or more bodies collide.A force which applies on the body (material) suddenly is known as sudden force.

4.) What is Geyser Pressure Valve?

Ans.Geyser Pressure Valve is to release the pressure created inside due to evaporation of water.

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MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

1.)What is difference between Corrective actions and Preventive actions?

Ans.Corrective actions are taken on discrepancies noticed during inspection of products/documents/process whereas preventive actions are taken to eliminate the possibility of discrepancy in future.

2.)What is Operating Pressure?

Ans.The amount of pressure nearest the point of performing work at the output end of a pneumatic system. The system operating pressure is used to specify the capability of valves and actuators.

3.)What are the Advantages and Disadvantages of using LPG in Car?

Ans.Advantages

1. Complete combustion

2. Fuel saving

3. Homogeneous combustion.

Disadvantages

1. As complete combustion is occurring ,more heat liberated,not advised for long journey, engine will be over heated

2. Installation is difficult

3. Reduce engine life efficiency.

4.)What is difference between Welding and Brazing?

Ans. In Welding concentrated heat (high temperature) is applied at the joint of metal and fuse together. In Brazing involves significantly lower temperatures and does not entail the melting of base metals. Instead, a filler metal is melted and forced to flow into the joint through capillary action.

WHY PETROL ENGINES ARE MORE POWERFUL THAN DIESEL ENGINES FOR THE SAME CUBIC CAPACITY?

Due to greater compression ratios and higher burning temperatures the diesel engine has a thermodynamic cycle that is basically more efficient than that of the gasoline engine. Then it uses less fuel per unit of power produced, but in order to do this it needs more space inside the cylinders to make the best use of the more extreme pressure and gas expansion characteristic.

Consequently, when the two engines being compared have the same volumetric capacities, than the amount of power of the gasoline engine is more, but it takes more fuel and a greater heat loss to achieve this.

MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

1.)What does pump develop:- (a) Flow (b) Pressure

Ans.A pump does not create pressure, it only creates flow. Pressure is a measurement of the resistance to flow.

2.) Difference between Performance and Efficiency?

Ans.The accomplishment of a given task measured against preset known standards of accuracy, completeness, cost, and speed is called as Performance. Efficiency is defined as the input given and the work obtained from that input like money, time, labour etc. It’s the main factor of productivity.

3.)What is Sentinel Relief Valve?

Ans.It’s a special type valve system. The valve will open when exhaust casing pressure is excessive (high). The valve warns the operator only; it is not intended to relieve the casing pressure.

4.) What is the difference between Specification,Codes, Standards?

Ans. Specification is describing properties of any type of materials. Code is procedure of acceptance and rejection criteria. Standard is accepted values and compare other with it.