Mechanical Engineering Interview Questions Part 11

March 29, 2017 | By | 1 Reply More

Hello fellow mechanical engineers !! This is the 11th part of Mechanical Engineering Interview Questions. Thank you for your support in the last 10 parts !! I hope you guys will enjoy this part also. So lets begin –

Here is a gift for you mechanical engineering students :

Mechanical Engineering Interview Questions with Answers

What is LMTD method ?

Answer: LMTD means logarithmic mean temperature difference. Generally it is used to measure the heat transfer of the flow systems. In most cases lmtd method is used to measure the heat transfer in heat exchangers most commonly in  double pipe heat exchangers. Here is the mathematical expression of lmtd method –

LMTD method

ΔTA is the temperature difference between the two fluids at the one end denoted by A . ΔTB is the temperature difference between the two streams of fluids at end B .

Amount of heat exchanged in a heat exchanger can be calculated from this equation –

Mechanical Engineering Interview QuestionsWhat is Gear Train ? Describe Gear Train formula.

Answer : Gear or cogwheel is a mechanical device which is used to transmit torque. A gear generally meshes with another gear by means of tooth. In gear train two or more gears are mounted on a frame for transmitting power. In the figure  you can see the typical gear train arrangement.

Mechanical Questions with answers

What is Cam  ?

Answer: Cam is a mechanical linkage which transforms rotary motion to linear motion and vice versa. Cams can be very versatile. The most common use of cam is seen in automobile camshaft.

What is CAD ?

Answer: CAD means Computer Aided Design. This is a system in which computer systems are used to create, modify analyse or optimize a design.  CAD files generally gives an output which can be used for printing, machining and manufacturing processes .  CAD improves the productivity of a designer as well as improve the accuracy for machining. Documentation for drawing and design has become very easy by means of CAD as it helps to keep the database updated very easily. Before CAD it was very much arduous to keep the database  up to date for drawings and designs. These CAD drawings can be used in CNC machine for manufacturing a product in very short time.

What is STUD , BOLT and NUT ?

Answer:

Bolts are generally externally threaded fasteners which are inserted in a hole and tighten up by means of nuts.

Screws are generally externally threaded fasteners which are inserted in a hole which is internally threaded. No additional nuts are needed to tighten up the screws.

Studs are bolts which are threaded on both ends and tightened up by using nuts on the threaded ends to hold a part.

What is Shear Stress and Normal Stress ?

Answer: There are two type of stress that can be developed inside a material. Normal stress and shear stress. The stress which is developed in a direction perpendicular to the face is known as normal stress. The stress which is developed in a direction parallel to the face is known as shear stress.

What is boiler draught ?

Answer: It is process of supplying continuous air to the boiler furnace for efficient burning of the fuel for producing steam.  It is actually the pressure difference between the grate level hot flue gases and the exit point gases. Draught can be natural or forced.

What are the different types of gear boxes ?

Answer: There are 4 types of gear boxes used in the machines and mechanisms

  • Sliding Mesh Gear Box
  • Synchromesh Gear Box
  • Constant Mesh Gear Box
  • Planetary Gear Box

For More Q & A Look at this links :

 

 

Category: Aerodynamics, Automobile, CAD, Fluidics, Heat Transfer, IPE, Manufacturing, Mechanical, Mechanics, Power Plant, Q & A, Refrigeration, Strength of Materials, Thermodynamics

About the Author ()

Basic Mechanical Engineering is a small endeavor for the mechanical engineering students and fresh graduates. All the articles are written by mechanical "rocking" engineers \m/

Comments (1)

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  1. gervase says:

    As a fellow engineer, in the field of CNC I love your concise explanations of CNC/CAD/CAM
    Great post!

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