BARC OCES/DGFS recruitment interview questions - Part 2

Hi,

I am glad to share some more questions asked in BARC OCES/DGFS recruitment interview for mechanical engineering discipline in 2015. These questions were shared by my colleague.

1.       Draw the shear force and bending moment diagrams for the following beam subjected to point load at the mid span. (Ref fig.1)

2.       In the above problem, replace the beam with a rope and draw the SFD & BMD. Which one will have more strength and Why? (Ref fig.1)

3.       What is the required load ‘W’ to be applied in order to make θ zero degrees? (Ref fig. 2)

Fig. 2

4.       Two steel balls, one is of volume V and the other is of volume 2V. Both contains same amount of sensible thermal energy 2000J in them. Which will have more temperature?

5.       Two spherical bodies of same diameter D, are connected by a string as shown in fig. 3. If the string is in tension, can both be of same material? Determine the weights of the two bodies. (Ref fig.3)

6.       For the bar shown in figure below, assuming 1-D axial heat conduction and completely insulated boundaries around and subjected to same temperature 1000 K at the ends at time t=0. If the initial temperature of the bar is 300K, draw the temperature profile along the length, at some typical instances for t>0. (Ref fig.4)

7.       There are two vessels, A and B, having same diameter and containing water to the same level. But one vessel has steel ball in it and they are heated from bottom at the same time. Draw the approximate average water temperature variation in them with respect to time. Does both require same amount of time to start boiling under same ambient pressure conditions? If not, which one requires more time? (Ref fig.5)

8.       For a reversible Carnot engine, find the relation between temperatures T_H, T_C and heats Q_H, Q_C.

9.       Tell all the laws of thermodynamics with application for each law.

10.   How can you find whether scaling occurred on condenser tubes or not?

11.   Draw the temperature profiles for shell side and tube side fluids for a typical condenser.

12.   What is the stress in the below bar subjected to force P1 at one end and force P2 at other end? (Ref fig.6)

All the very Best.!!!

BARC interview questions - sample

Hi friends,
Glad to meet you after a long time. Recently, I have attended interview for OCES/DGFS 2015 in BARC, Mumbai. Many friends told about how the interview would be. But with own experience I am sharing here the questions asked for me. I have told "Thermodynamics, Fluid mechanics, Heat transfer, Strength of materials and Engineering mechanics" as my interested subjects. Then they have asked me the following ten questions. One thing I want to tell you, "this is the minimum level of questions they would ask. they can go to any level based on your performance".

1.       A diatomic gas is given Q amount of heat, during which, it has done Q/2 amount of work. Then find (a) the heat capacity of the gas and (b) the amount of heat required to raise its temperature by 100⁰C?

2.       Plot the following process in T-v coordinates. Take the system as ideal gas.

3.       Draw shear force and Bending moment diagrams for the following cantilever beam.

4.       A tank has two holes 1 and 2 at same depth as shown in figure. If both were opened at same time, water from which hole reach the datum line earlier?

 

5.       Plot T_s (surface temperature), T_b (bulk fluid temperature) with respect to axial distance for the fluid flowing through a pipe with (a) constant surface temperature (b) constant surface heat flux boundary conditions.

6.       A beam has rectangular cross section. If the height of cross section is increased without changing neutral axis location and width (see figure), plot the variation of normal stress along the height before and after modification.

7.       See the figure below. In two configurations the whole system is isolated from surroundings and the heat transfer is occurring only between the two blocks. Determine and explain which ice block would melt earlier A or B?

8.       The two-mass system with massless rod shown in figure is pivoted at A. It is released from rest from the state shown. (a) what is the velocity of m_B just before it touches the spring (in vertical position)? (b) assuming very high stiffness of the spring (Hint: angular displacement of rod after touching the spring is negligible), what would be the maximum deflection of spring?

 

9.       If two persons P1 and P2 are standing on a horizontal rotating disk at centre and periphery respectively.  Draw the trajectories of volley ball as seen by P1 and P2 (a) If P2 throws the ball straight towards P1, (b) If P1 throws the ball straight towards P2.

 

10.   In a setup shown, what is the minimum velocity V of plunger required to draw water from the tank into the air stream?