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Mechanical Engineering Interview Questions

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Relative humidity

Asked By: Ghassan Talal Mohammad | Asked On: Aug 28th, 2012

How does the cooling by air conditioning affect the relative humidity?

Answered by: rekha on: Dec 3rd, 2012

Relative humidity is ratio of mass of vapors in a given volume of air to the mass of vapors in the same volume at saturated point. With increase or decrease of % humidity or degree of saturation the relative humidity will be effected.

Answered by: satya on: Nov 23rd, 2012

Relative humidity is the ratio of partial vapor pressure of air to the partial vapor pressure of air at saturation temperature.

What is dtsi technology?

Asked By: anoop4real | Asked On: Apr 13th, 2007

Answered by: Rodrigues sharma on: Nov 29th, 2012

DTSi is the technology only available in BAJAJ automobiles.
DTSi means Digital Twin Spark ignition.
This is better technology to get more efficiency in motor bikes and also get good consumption of fuel.

Answered by: Bhushan Kulkarni on: Aug 9th, 2011

DTS-i means digital twin spark ignition.basically,this technology introduces usage of two spark plugs which are having approx. 90 degree angle which ensures complete fuel combustion as well as better ...

Train differential

Asked By: sharu46 | Asked On: Jan 10th, 2010

Why there is no differential in a train. What happens when a train takes a turn?

Answered by: Komal Ashu on: Nov 7th, 2012

To facilitate turning of the trains, a number of factors are taken into consideration. The trains never turn at a very sharp angle. The change in direction of the trains is facilitated by a gradually ...

Answered by: Deepak jangir on: Dec 27th, 2011

No there is no such device. Outer wheel, while taking a turn must travel a larger distance comparatively to the inner one. This is accomplished by providing the greater dia on outer side of both the w...

Elasticity

Asked By: vrsaikumar | Asked On: Jun 25th, 2009

Which is more elastic - steel or rubber?

Answered by: Pankaj on: Oct 31st, 2012

Elasticity is the property by virtue of which body regain its original shape and size after removal of external force.

Answered by: LDK on: Oct 29th, 2012

Steel have a more elasticity then any other material

Refrigeration

Asked By: ksomakiran | Asked On: Mar 28th, 2010

Why is the ice maker placed at the top of the refrigerator?

Answered by: Vikrant Singh on: Oct 25th, 2012

Due to maintain the convection in refrigerator. When air is cool in refrigerator it moves downward and hot air moves upward because cold air is denser than hot air this phenomena is called as convection, so movement of air take place regularly.

Answered by: Mallayya S M on: Oct 12th, 2012

In every refrigerator have the cooling place at the top order because the coolants have the high temperature as compared to outer means earth then it could have there is possible to happen become low temperature also not comfortable to user.

Materials mechanics

Asked By: adnan mehmood | Asked On: Oct 30th, 2010

How can elasticity of ductile material be double as brittle material?

Answered by: Kiran on: Oct 13th, 2012

Molecular structure of ductile & brittle materials are different. Elasticity of both the cases can be well understood by tension/compression test, as you can notice ductile materials will yield & brittle will break.
Stress release in ductile is good in ductile.

Answered by: Mallayya S M on: Oct 12th, 2012

Because the elasticity regains its shape and size.

How many types of suspensions used in automobiles ?

Asked By: vignesh | Asked On: Sep 13th, 2011

Answered by: Mallayya S M on: Oct 12th, 2012

Leaf spring
Coil spring
Shock absorbers

Answered by: fabricelion on: Sep 20th, 2012

Leaf spring , coil spring , torsional bar and air suspension

Thin aluminum foil

Asked By: Rakesh k | Asked On: Sep 17th, 2012

How thin aluminum foil (used for packing food items) are made?

Answered by: Mallayya S M on: Oct 12th, 2012

Yes its used in material or any food packaging because its have a property of less corrosive and light weight .

Answered by: Navneet Saini on: Sep 20th, 2012

It is by rolling the aluminium in between the rollers so as to obtain thin sheets of Al

How does an MPFI system work?

Asked By: anoop4real | Asked On: Mar 26th, 2007

Answered by: bhanu tomar on: Oct 6th, 2012

MPFI means multi-point fuel injector. Latest 4 stroke and 4 cylinder engines consists of MPFI system which enables them to inject fuel at each cylinder at a single time.

Answered by: bijoy kumar pradhan on: Sep 15th, 2012

how to use gear box in compressor

What is meant by 1st angle & 3rd angle position in engineering graphics ?

Asked By: Vaghani Milan | Asked On: Mar 28th, 2012

Answered by: Mecha on: Sep 26th, 2012

Consider side view of any object. In the case of 1st angle projection left side view is drawn in right side & right side view is drawn on left. While considering 3rd angle projection Views are drawn in same side..left view in left and right in right

Answered by: SANTHOSH KUMAR.K on: Aug 9th, 2012

in first angle projection object is placed in b/w plane and viewer .
in thrived angle projection plane is positioned in b/w viewer and object.

Future scope of system administrator

Asked By: karthiks443 | Asked On: Sep 23rd, 2012

I am mechanical engineer,presently doing system administrator job ,wanted to know about the scope of system administration job,expected salary in my job,and is it a bpo job

Mcpherson

Asked By: fabricelion | Asked On: Sep 19th, 2012

State two safety precaution must be take when removing a mcpherson strut from a vehicle.....

Mechanical engineer hr interview

Asked By: Rajagopalan | Asked On: Sep 20th, 2011

Being a mechanical engineer why do I prefer a software company?

Answered by: shashank upadhyay on: Sep 15th, 2012

As I have computer language knowledge and I want to utilize this so I am more comfortable and productive with software company.

What is the function of disc plate in clutch?

Asked By: abhi11092451 | Asked On: Mar 17th, 2011

Answered by: Jay on: Sep 8th, 2012

As integral part of clutch it is connected with flywheel when the wheel is to be rotated. It is connected by the force which is exerted by pressure plate. It rotates because of high friction between c...

Answered by: BHAUTIK USDADIYA on: Sep 7th, 2012

Disc Plate and Clutch is joint to engine. It helps to start the engine and also to disassemble off the engine.

Fixed gear

Asked By: harshitat9 | Asked On: Dec 8th, 2008

What is fixed gear?

Answered by: BHAUTIK USDADIYA on: Sep 7th, 2012

Main gear is known as fixed gear.

Answered by: ahmedsaid2050 on: Jan 26th, 2012

A fixed-gear it is single speed like bicycle (or fixed-wheel bicycle, sometimes known as a fixie) is a bicycle that has no freewheel, meaning it cannot coast, as the pedals are always in motion when the bicycle is moving.

MPFI system

Asked By: deepesh16 | Asked On: Apr 15th, 2012

What is MPFI system?

Answered by: vandita.t on: Sep 2nd, 2012

MPFI,multi point fuel injection system,it gives better distribution of fuel into the multi cylinder engine.equal amount of fuel to each engine results in better combustion and efficiency of the engine.

Answered by: AJINKYA PATIL on: Aug 5th, 2012

MULTI POINT FUEL INJECTION SYSTEM .there are 3 to 4 fuel injectors are used to inject more fuel into the cylinder

What is dtsi? Why is this used in motor bikes?

Asked By: piyush | Asked On: Sep 12th, 2011

Answered by: Mukesh yadav on: Sep 1st, 2012

Digital Twin Spark Ignition
This is used to get better combustion in combustion chamber.Double spark plug is used to obtain better combustion of fuel in cylinder head. It provide better efficiency and economical in fuel consumption

Answered by: AJINKYA PATIL on: Jul 28th, 2012

digital twin spark ignition engine which is used for better combustion.In which two spark plugs work at a time.one is used for starting the engine and the other used for initiating combustion.

Cooling of water

Asked By: vishal patil | Asked On: Aug 9th, 2011

Why the water collected below mud pot is cooler than that is in the pot?

Answered by: Sagar Gupta on: Aug 27th, 2012

It is due heating effect of evaporation.

Answered by: dilip on: Jul 10th, 2012

the heat transfer is very quick in mud pot when we compared to other material ...that's the reason y water get cooled

Resistance force

Asked By: NSK7777 | Asked On: Sep 19th, 2009

A mass of 100kg is falling from a height of 1m and penetrates the sand to 1m. What is the resistance force of the sand?

Answered by: Rakesh k on: Aug 7th, 2012

First of all we have to calculate the potential energy of mass(100kg) just when it is going to fall. As we know that energy cannot be created nor destroyed, so, only one forms of energy changes to oth...

Answered by: BASHEER AHAMED. H on: Aug 6th, 2012

No, the above answer is partially correct. Look, Just before reaching the ground, the velocity of the body is as calculated above (1.4 m/s). Once it start penetrating it into the ground, it will have ...

Carrier question

Asked By: suryadeepak | Asked On: Jul 7th, 2012

My name is surya and I recently completed my b.Tech in mechanical engineering as a fresher I have so many roots to start my career in the relevant field .In that I have selected some opportunities and has 1) in design field 2) in power plants construction field 3) in qc i.E in pipe inspection and...

Answered by: Rakesh k on: Aug 7th, 2012

dear friend, first of all you have to think that in which field you have more interest. A field in which you have much interest, definitely you will do better there. In my view, pipe inspection (quali...

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