Go Back   2019-2020-2021 StudyChaCha > StudyChaCha Discussion Forum > General Topics




  #2  
Old July 17th, 2015, 10:36 AM
Super Moderator
 
Join Date: Jun 2013
Default Re: BARC Paper for Mechanical

Here I am providing the list of few questions of Bhabha Atomic Research Centre Mechanical Engineering Placement exam question Paper which you are looking for .

The critical value of Reynolds number for transition from laminar to turbulent boundary layer in external flows is taken as

(a) 2300 - Answer
(b) 4000
(c) 5 x 105
(d) 3 X 106
(Expl : Critical value of Reynolds number for transition from laminar to turbulant layer in external flows is taken as 2300.)

The by-pass factor of single coil in an air-conditioner is 0.7. The by-pass factor, if three such cooling coils with the same appartus dew point are kept one behind the other will be
(a) 0.210
(b) 0.292
(c) 0.343 - Answer
(d) 0.412

Which one of the following statements is true for air conditioning duct design ?
(a) Static regain method is used, when the duct work is extensive, total pressure drop is low and flow is balanced
(b) Static regain method is used, when the duct work is extensive, total pressure drop is high and flow is unbalanced
(c) Equal friction method is used, when the duct work is extensive, total pressure drop is low and flow is balanced - Answer
(d) Equal friction method is used, when duct work is extensive, total pressure drop is low and flow is unbalanced.

For an-conditioned space, RTH = 100 kW; RSHF = 0.75, volume flow rate is equal to 100 m3/minute and indoor design specific humidity is 0.01 kg/(kg of dry air). The specific humidity of supply air is
(a) 0.010
(b) 0.0075
(c) 0.005 - Answer
(d) 0.0025

For an air-conditioning system, the outdoor and indoor design dry bulb temperature are 45o C and 25oC respectively. The space to be air-conditioned is 20 m X 30m X 5 m and infiltration is estimated to be one air change. If the density and specific heat of air are 1.2 (kg of dry air)/m3 and 1.02 kJ/(Kg of dry air)oC, then the sensible heat load due to infiltration is nearly
(a) 122.4 kW
(b) 61.2 kW
(c) 12.24 kW
(d) 20.4 kW - Answer

Match List -I and List ii and select the correct answer using the codes given below the lists:
(hm - mass transfer coefficient, D - molecular diffusion coefficient
L - characteristic length dimension k - thermal conductivity , p - density
Cp - specific heat at constant pressure u - dynamic viscosity )

Codes :
A B C D
(a) 4 3 2 1
(b) 3 4 2 1 - Ans
(c) 4 3 1 2
(d) 3 4 1 2
In the operation of four-stroke diesel engines, the term 'squish' refers to the
(a) injection of fuel ! in the precombustion chamber - Ans
(b) discharge of gases from the precombustion chamber
(c) entry of air into the combustion chamber
(d) stripping of fuel from the core

Consider the following statements regarding the advantages of fuel injection over carburetion in S.I. engines :
1. Higher power output and increased volumetric efficiency
2. Simple and inexpensive injection equipment
3. Longer life of injection equipment
4. Less knocking and reduced tendency for back-fire
Select the correct answer using the codes given below :
Codes :
(a) 1, 2 and 3
(b) 1, 2 and 4
(c) 2 and 3
(d) 1 and 4 - Ans

Match List -I(Performance Parameter Y) with List-II (Curves labelled 1,2,3,4 and 5 BHP vs. Y) regarding a C.I. engine run at constant speed and select the correct answer using the codes given below the lists:

Codes :
A B C D
(a) 5 3 4 2 - Ans
(b) 1 3 4 2
(c) 5 4 2 3
(d) 1 4 2 3

Match List -I with List -II(Use) and select the correct answer using the codes given below the list:
List - I List - II
A. Supercharging 1. Multicylinder engine
B. Morse test 2. C.I. engine
C. Heterogeneous combustion 3. Calorific value
D. Ignition quality of petrol 4. Aircraft engine
5. Octane number
6. Single cylinder S.I. engine

Codes :
A B C D
(a) 4 1 2 5 - Ans
(b) 6 3 2 5
(c) 6 1 5 2
(d) 4 3 5 2

With reference to Turbojet and Rocker engines, consider the following statements :
1. Efficiency of Rocket engines is higher than that of Jet engines
2. Exit velocities of exhaust gases in Rocker engines are much higher than those in Jet engines
3. Stagnation conditions exist at the combustion chamber in Rocket engines
4. Rocket engines are air-breathing engines
Which of these statements are correct ?
(a) 1 and 2 - Ans
(b) 1, 3 and 4
(c) 2,3 and 4
(d) 1, 2 and 3

With respect to I.C. engine emission, consider the following statements :
1. Evaporative emissions have no carbon monoxide and oxides of nitrogen
2. Blow by emission are essentially carbon monoxide and suspended particulate matter
3. Exhaust emissions contain 100% of carbon monoxide , 100 % of oxides of nitrogen and around 50-55% of hydrocarbons emitted by the engine.
4. There are no suspended particulates in the exhaust.
Of these statements
(a) 1 and 4 are correct
(b) 1 and 3 are correct
(c) 2 and 3 are correct - Ans
(d) 1,2,3 and 4 are correct

A hydrocarbon fuel was burnt with air and the Orsat analysis of the dry products of combustion yielded the following data :
Initial volume of dry gas sample --- 100 cc
Volume after absorption in pipette 1 containing --- 89 cc
potassium hydroxide solution
Volume after absorption in pipette 2 containing --- 84 cc
solution of pyrogallic acid and potassium hydroxide
Volume after absorption in pipette 3 containing --- 82 cc
cuprous chloride solution
The percentage (by volume) of CO2 in the dry product was
(a) 2%
(b) 5%
(c) 11% - Ans
(d) 18%

Match List -I with List -II(Use) and select the correct answer using the codes given below the list:
List -I (Material) List-II (Use)
A. Graphic 1. Coolant
B. Thorium-233 2. Moderator
C. Molten Sodium 3. Fissionable material
D. Plutonium-239 4. Fissile material
Codes :
A B C D
(a) 1 4 2 3
(b) 2 4 1 3 - Ans
(c) 2 3 1 4
(d) 1 3 2 4

The data given in the table refers to an engine based on Carnot cycle, where
Q1 = Heat received (kJ/min), Q2=Hear rejected (kJ/s), W=Work output (kW)
S. No. Q1 Q2 W
1. 1500 16.80 8.20
2. 1600 17.92 8.75
3. 1700 19.03 9.30
4. 1800 20.15 9.85
If heat received by the engine is 2000 kJ/minute the work output will be, nearly,
(a) 9.98
(b) 10.39
(c) 11.54
(d) 10.95 - Ans

A system while undergoing a cycle
A__B__C__D__A has the values of heat and work transfers as given
Q W
Process kJ/min kJ/min
A__B +687 +474
B__C -269 0
C__D - 199 -180
D__A +75 0
The power developed in kW is, nearly,
(a) 4.9 - Ans
(b) 24.5
(c) 49
(d) 98

In a new temperature scale say op, the boiling and freezing points of water at one atmosphere are 100op and 300op respectively. Correlate this scale with the Centigrade scale. The reading of 0o p on the Centigrade scale is
(a) 0oC
(b) 50oC
(c) 100oC
(d) 150oC - Ans

Match List-I (Name of entity) with List-II (Definition) and select the correct answer using the codes given below the lists:
List-I (Name of entity) List-II (Definition)

Codes :
A B C D
(a) 2 1 4 3
(b) 2 3 4 1
(c) 4 3 2 1 - Ans
(d) 4 1 2 3

If Pu and pv denote respectively the partial pressure of dry air and that of water in moist air, the specific humidity of air is given by
(a) Pv
Pu + Pv

(b) Pv
Pu

(c) 0.622 Pv - Ans
Pu

(d) 0.622 Pv
Pu +Pv

Consider the phase diagram of a certain substance as shown in the given figure. Match List I(Process) with List-II (Curves/lines) and select the correct answer using the codes given below the lists:
List I(Process) List-II (Curves/lines)
A. Vaporization 1. EF
B. Fusion 2. EG
C. Sublimation 3. ED

Codes :
A B C
(a) 1 3 2 - Ans
(b) 1 2 3
(c) 3 2 1
(d) 3 1 2

Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs-phase rule as
(a) C__P__F = 2
(b) F__C__P = 2
(c) C+F - P = 2
(d) P + F-C = 2 - Ans

Consider the following statements :
1. Availability is the maximum theoretical work obtainable.
2. Clapeyron's equaation for dry saturated steam is given by

3. A gas can have any temperature at a given pressure unlike a vapour which has a fixed temperature at a given pressure.
4. Joule Thomson coefficient is expressed as

Of these statements
(a) 1, 2 and 3 are correct - Ans
(b) 1, 3 and 4 are correct
(c) 2 and 3 are correct
(d) 1, 2 and 4 are correct

Match List-I with List-II and select the correct answer using the codes given below the lists :

Codes :
A B C D
(a) 3 4 1 2 - Ans
(b) 1 4 3 2
(c) 3 2 1 4
(d) 1 2 3 4

The temperature -entropy diagram for a steam turbine power plant, operating on the Rankine cycle with reheat and regenerative feed heating is shown in the given figure. If m denotes the fraction of steam bled for feed heating, the work developed in the turbine per kg steam entering the turbine at state 5 is

(a) (h5 -h4) + (1-m)(h3-h1) - Ans
(b) (h5-h4)+(h3-h2)+(1-m)(h2-h1)
(c) 2h5-h4-h2+(1-m)(h2-h1)
(d) (h5-h4) +(1-m)(h3-h2)

The working temperature in the evaporator and condenser coils of a refrigerator are -30oC and 32oC respectively. If the actual refrigerator has a C.O.P of 0.75 of the maximum. the required power input for a refrigerating effect of 5 kW is, nearly,
(a) 1.7 kW - Ans
(b) 2.94 kW
(c) 3.92 kW
(d) 4.0 kW
__________________
Answered By StudyChaCha Member
Reply With Quote Quick reply to this message
  #3  
Old October 16th, 2015, 11:26 AM
Unregistered
Guest
 
Default Re: BARC Paper for Mechanical

Hey buddy I have completed Mehcanical engineering and want to apply for the BARC will you please get me the question for an Mechanical engineer.
Reply With Quote Quick reply to this message
  #4  
Old October 16th, 2015, 11:27 AM
Super Moderator
 
Join Date: Dec 2012
Default Re: BARC Paper for Mechanical

As you have completed your Mechanical Engineering and now you want to apply for the BARC for that I will get the placement paper so that you can easily go through it.

Here is the BARC placement exam paper.

I qualified the written exam conducted by BARC and attended the interview.
First let me tell you that this is the most genuine and toughest interview among all the PSUs. This is the best interview methodology that they adopt.
They just ask for very basic questions of Intermediate (12th) level and want to check the basic understanding. Almost all the questions are practical questions no direct relation with the knowledge of core technical. In this way they look for the way you approach to solve a problem.
Because the post they offer you is scientific officers, post. This is a research oriented job that requires the great skills and knowledge to solve a real practical problem. So, this was a basic idea about the interview. Now let,s talk about the methodology, actually they ask you 4-5 subjects in which
you are more comfortable and ask the basic questions. But keep in mind that you are really comfortable with those subjects and you should be thoroughly prepared. Because they will try to divert you from your answer and will drill on topic till you surrender. But anyway you don,t worry
even if you are not able to solve a problem for whole but the way you approach and the basic concepts should be correct. They are generally the minimum time
for interview is more than 45 minutes. Even the person they know will not be qualified; they drill him at least for 45 minutes. As the interview timing cross more than 45-60 minutes, your chance goes on increasing to get selected. Finally If they are satisfied with your performance then they give you a medical slip that insures your eligibility fir the interview. Final Result depends on the no. of posts and the merit list prepared on the basis of marks you achieved in written and interview. I wish you all the best for your interview.

It is well known that hard work and the luck both are that major factor that plays important roles in every exam. Your Luck also plays an important role that by which panel you are going to be interviewed. During my interview I was a victim of bad luck so I could not qualified the interview.
I had heard that the panel members being very helpful they bring you out of the pressure if you feel during the interview but this was not true in my case.

Anyways, I entered in the room, there were 5 members. The committee chairman asked me about my hometown. The whole conversation was in Hindi, so the people who are from Hindi background they don,t need to be afraid of this problem in PSU interviews.
Then he asked me "Is it your first interview or you
have gone through any other interview?", Me: "Sir this is my first interview". This normal conversation is just to make you feel good and to make
you comfortable.
Chairman: So you have done your B.Tech from IIIT?
Me: Yes Sir.
Suddenly another person interrupted as he was looking at my cv, he told to the chairman that I got first Prize in solid modeling Contest. This was a curse for me for that interview.
Chairman: So you got first prize in Modeling?
Me: Yes sir.
Chairman: What is Computer Aided Design?
Me: I told.
Chairman: You have been taught the Finite Element Methods course?
Me: Yes sir.
Chairman: Can you do the analysis of a cylindrical pressure vessel?
Me: No sir, actually we just learnt the analysis of one dimensional objects.
Chairman: But you know the basics of analysis steps?
Me: Yes sir.
Chairman: What will be the first step?
Me: We will take the symmetry and will not require going through the analysis of whole section.
Chairman: Draw the element of symmetry?
Me: I drawn.
Chairman: Next step?
Me: Boundary conditions and Forces.
Chairman: What will be the boundary conditions, forces etc.....?
I could not give the answers, and the trials were wrong and I was totally confused. but he rammed me a lot and wasted almost 10 minutes.
It was a bad impression that lead me through the darkness.
Then he asked me to put the name of subjects I studied in B.Tech as our curriculum is different from other colleges curriculum, It has major emphasize on Design. So under pressure I was not able to recall the subjects. I started to recall them and listed on the paper but didn,t minded to put them in the order
I prepared. Actually I prepared Material science, Thermodynamics, Heat Transfer and Micro Metal Forming (for the fabrication of MEMS devices, a recent topic). So they just started asking the questions randomly from the subjects they got in that list. After a sometime chairman asked me about the subjects I am comfortable. I told and given the preference to Micro-Metal Forming that was a new topic for him and he decided to get out of the topic and asked about the issues when we go through the micro forming. I told that as we go from macro size to micro, the strength, isotropic behavior and surface roughness changes and affect a lot. Then he asked how surface roughness comes into picture?
Me: As material thickness approaches towards micro size, the no. of grain boundaries becomes fewer and grain boundaries sizes are in the order of microns so the very early surface has a lot of deviations that comes in picture. Then he asked: What is inside the space between two grain boundaries; Gas or Vacuum?
Me: Sir Vacuum. He Said: You are wrong, go and refer the books. and in this way he came out of the topic that he was trying for.
So, I will suggest you not to give any new topic as the persons taking interview may or may not be comfortable with that and it may be a curse to you.
In Thermo... he asked
He: there is a cylinder-piston system that contains a gas, a weight W is kept on piston what will be the pressure?
Me: Sir W/(g*A)---A: area, g: gravity (It was wrong actually I was in such a pressure that to calculate the pressure I was using the formula M/A)
Then another person asked me about "g", why I am using it ? I confidently said: sir to get the mass from weight
He knew that I am confused so he asked me to derive it,s dimension I derived then he asked me to derive the dimension of force by area and he asked me to compare, and I found my mistake. I said sorry and then
He: I am giving it "Q" all the boundaries are insulated so that no heat goes outside, calculate it,s final volume?
Me: I was confused and was asking about a lot of irrelevant information needed to solve.
He: This is all I told you now calculate the volume...no other information.
I could not derive it.

Then......Fluid:
He: I am having an wedge shaped vessel (triangular shaped) I want to know the water level at different places, what will be the levels of water at different tubes?
Me: Same level in every tube.
He: why?
Me: because of fluids property...pressure at a level is same at every point So the height raised will compensate for it.
He: ok so, pressure is constant at all the points in same level but different at different levels?
Me: Yes sir.
He: So if I make two holes at different levels and fit a tube at outside from the vessel then water will flow?
Me: yes sir.
He: If I place a turbine in between the pipe then will the electricity produced?
Me: No.
He: why?
Me: because water will flow once only.
He: but pressure difference is continuously acting at two different levels?
Me: as once water flows and the section gets filled pressure at the same level in vessel and pipe will be same, So no way it will flow again.

This was a section where I was somewhat comfortable and answered correctly.

SOM:

Shear stresses, how shear stress comes ....Is bending stress and shear stress same and a lot....they make me totally confused.
Mohr,s Circle related questions. That I replied correctly.
As you know that I am from Department of Mechanical Engineering. I qualified the written exam conducted by BARC and attended the interview.
First let me tell you that this is the most genuine and toughest interview among all the PSUs. This is the best interview methodology that they adopt.
They just ask for very basic questions of Intermediate (12th) level and want to check the basic understanding. Almost all the questions are practical questions no direct relation with the knowledge of core technical. In this way they look for the way you approach to solve a problem.
Because the post they offer you is scientific officers, post. This is a research oriented job that requires the great skills and knowledge to solve a real practical problem. So, this was a basic idea about the interview. Now let,s talk about the methodology, actually they ask you 4-5 subjects in which
you are more comfortable and ask the basic questions. But keep in mind that you are really comfortable with those subjects and you should be thoroughly prepared. Because they will try to divert you from your answer and will drill on topic till you surrender. But anyway you don,t worry
even if you are not able to solve a problem for whole but the way you approach and the basic concepts should be correct. They are generally the minimum time
for interview is more than 45 minutes. Even the person they know will not be qualified; they drill him at least for 45 minutes. As the interview timing cross more than 45-60 minutes, your chance goes on increasing to get selected. Finally If they are satisfied with your performance then they give you a medical slip that insures your eligibility fir the interview. Final Result depends on the no. of posts and the merit list prepared on the basis of marks you achieved in written and interview. I wish you all the best for your interview.

It is well known that hard work and the luck both are that major factor that plays important roles in every exam. Your Luck also plays an important role that by which panel you are going to be interviewed. During my interview I was a victim of bad luck so I could not qualified the interview.
I had heard that the panel members being very helpful they bring you out of the pressure if you feel during the interview but this was not true in my case.

Anyways, I entered in the room, there were 5 members. The committee chairman asked me about my hometown. The whole conversation was in Hindi, so the people who are from Hindi background they don,t need to be afraid of this problem in PSU interviews.
Then he asked me "Is it your first interview or you
have gone through any other interview?", Me: "Sir this is my first interview". This normal conversation is just to make you feel good and to make
you comfortable.
Chairman: So you have done your B.Tech from IIIT?
Me: Yes Sir.
Suddenly another person interrupted as he was looking at my cv, he told to the chairman that I got first Prize in solid modeling Contest. This was a curse for me for that interview.
Chairman: So you got first prize in Modeling?
Me: Yes sir.
Chairman: What is Computer Aided Design?
Me: I told.
Chairman: You have been taught the Finite Element Methods course?
Me: Yes sir.
Chairman: Can you do the analysis of a cylindrical pressure vessel?
Me: No sir, actually we just learnt the analysis of one dimensional objects.
Chairman: But you know the basics of analysis steps?
Me: Yes sir.
Chairman: What will be the first step?
Me: We will take the symmetry and will not require going through the analysis of whole section.
Chairman: Draw the element of symmetry?
Me: I drawn.
Chairman: Next step?
Me: Boundary conditions and Forces.
Chairman: What will be the boundary conditions, forces etc.....?
I could not give the answers, and the trials were wrong and I was totally confused. but he rammed me a lot and wasted almost 10 minutes.
It was a bad impression that lead me through the darkness.
Then he asked me to put the name of subjects I studied in B.Tech as our curriculum is different from other colleges curriculum, It has major emphasize on Design. So under pressure I was not able to recall the subjects. I started to recall them and listed on the paper but didn,t minded to put them in the order
I prepared. Actually I prepared Material science, Thermodynamics, Heat Transfer and Micro Metal Forming (for the fabrication of MEMS devices, a recent topic). So they just started asking the questions randomly from the subjects they got in that list. After a sometime chairman asked me about the subjects I am comfortable. I told and given the preference to Micro-Metal Forming that was a new topic for him and he decided to get out of the topic and asked about the issues when we go through the micro forming. I told that as we go from macro size to micro, the strength, isotropic behavior and surface roughness changes and affect a lot. Then he asked how surface roughness comes into picture?
Me: As material thickness approaches towards micro size, the no. of grain boundaries becomes fewer and grain boundaries sizes are in the order of microns so the very early surface has a lot of deviations that comes in picture. Then he asked: What is inside the space between two grain boundaries; Gas or Vacuum?
Me: Sir Vacuum. He Said: You are wrong, go and refer the books. and in this way he came out of the topic that he was trying for.
So, I will suggest you not to give any new topic as the persons taking interview may or may not be comfortable with that and it may be a curse to you.
In Thermo... he asked
He: there is a cylinder-piston system that contains a gas, a weight W is kept on piston what will be the pressure?
Me: Sir W/(g*A)---A: area, g: gravity (It was wrong actually I was in such a pressure that to calculate the pressure I was using the formula M/A)
Then another person asked me about "g", why I am using it ? I confidently said: sir to get the mass from weight
He knew that I am confused so he asked me to derive it,s dimension I derived then he asked me to derive the dimension of force by area and he asked me to compare, and I found my mistake. I said sorry and then
He: I am giving it "Q" all the boundaries are insulated so that no heat goes outside, calculate it,s final volume?
Me: I was confused and was asking about a lot of irrelevant information needed to solve.
He: This is all I told you now calculate the volume...no other information.
I could not derive it.

Then......Fluid:
He: I am having an wedge shaped vessel (triangular shaped) I want to know the water level at different places, what will be the levels of water at different tubes?
Me: Same level in every tube.
He: why?
Me: because of fluids property...pressure at a level is same at every point So the height raised will compensate for it.
He: ok so, pressure is constant at all the points in same level but different at different levels?
Me: Yes sir.
He: So if I make two holes at different levels and fit a tube at outside from the vessel then water will flow?
Me: yes sir.
He: If I place a turbine in between the pipe then will the electricity produced?
Me: No.
He: why?
Me: because water will flow once only.
He: but pressure difference is continuously acting at two different levels?
Me: as once water flows and the section gets filled pressure at the same level in vessel and pipe will be same, So no way it will flow again.

This was a section where I was somewhat comfortable and answered correctly.

SOM:

Shear stresses, how shear stress comes ....Is bending stress and shear stress same and a lot....they make me totally confused.
Mohr,s Circle related questions. That I replied correctly.
__________________
Answered By StudyChaCha Member
Reply With Quote Quick reply to this message
Reply


Reply to this Question / Ask Another Question
Your Username: Click here to log in

Message:
Options

Forum Jump


All times are GMT +6.5. The time now is 07:00 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.0 PL2

1 2 3 4 5 6 7 8 9