NPCIL Interview Experience - 2019

NPCIL 2019 Ashish - Mechanical (AIR 183 ) Mumbai

Panel had 5 sirs and 1 mam

1- my name and place, college

2- why gap after graduation 

3- discussion about my company( as i am currently working), nature of work

4- subjcts ( HT, FM, SOM, THERMO)

5- fatigue loading design of shaft considering endurance limit and other factor

6- a tank has hole at the bottom derive the formula for velocity and if there is a pipe of connected to the hole,what will be the velocity at the end to pipe

7- tank has two hole in the vertical wall at some distance. And these holes are connected by a pipe. What will happen to to water level

8- flow will happen in the pipe or not and reason

9- what are the flow measuring device.. derive formula for orifice meter and where is it put in the pipe

10- derivation for elongation due to self weight 

11- gave one indeterminate beam to find out reactions

12- types of vibration

13- derive differential equation for single degree of freedom

14- phase diagram of forced damped vibration

15- what do you know about natural draught cooling tower. What type of heat exchnger is it?

16- Explain wet bulb temperature

17- condensor work in rankine cycle, why only condensor is used

****

NPCIL Interview Experience(Mechanical)  23/05/19

Duration: 35 min

First they asked how was your lunch, where you did your btech, where do you belong etc.

1. Favourite subjects: SOM FM THERMO HT

2. what are different theories of failure?

3. Overhanging beam on both side with UDL. Draw SFD and BMD

4. Bending stress distribution if it is rectangular x-s/c

5. steel and aluminum plates attached with each other at same temp. find stresses and elongation if temp is increased

6. temp profile in arrangement of previous problem if both side air is present

7. what happens to temp profile and heat flux if we replace air with water at on side

8.where will you place pump and which arrangement of discharge will you choose(they gave fig of arrangements)

9. Explain rankine cycle. why carnot cycle is not practical in power plant.

10.how much is the efficiency of thermal power plant? where does majority of loss occur?

11. what will be effect of removing condesor on efficiency?

Result: Cleared cutoff. Medical Examination done.

****

NPCIL Mechanical  Interview  20/05/19 Delhi

There were 3 panels and every panel had different procedure of interview(like some didn't care about favourite subjects) 

In my panel 6M + 1F 

They asked favourite subjects(som, thermo, Hmt, FM) but asked from anywhere and about subject from BTech marksheet. But asked very basics.

M1- koi plant visit kiya h kabhi
Me- no(although I had during BTech but didn't no anything even name of plant) 
Again 2-3 members they insisted kahi to gaye honge, IIT wale to le jate h 3rd yr ke baad
Me - clearly no
M1- 1) stress strain curve for steel + for creep + true stress strain and asked different regions. 
2) Types of defects, which defect is advantageous and how
3)work hardening, cold working

M2 - 1) ball bearing - type of load, components, types of thrust bearings, 
2)cycle - no. Of bearings and its types, rachet mechanism. 

M3 - thermo cycles explain process, uses and efficiency 

M4 - Instrumentation (from semester marksheet) - different types of measuring devices, thermocouple and its working, 
M4- Mechanics - fbd of eraser on desk, how will you show direction of its motion in fbd diagram.

F - cavitation, how to avoid it, how would you know if cavitation occur in pump

M5 - motor and generator, at what height cavitation occur in pump ideally at home.
Some questions I didn't remembered 

I was able to answer almost every question but as they are extending question so at some point if I didn't know the ans I said I don't know
At last (a clear signal) they asked me about job profile and do I have any problem if they post me any of there location.

****

 Nayandeep Ranjan  24/05/19   Delhi

1) Prime mover in Pump?
Vanes losses,manometric efficiency, Manometric Head,what will happen if we don't have radial entry?
Where will be more pressure on vane convex or concave side ?
What happens if the pump is working with no fluid?

Heat Transfer
1) What is a thermoflask?
What components can be used to design it?
What material is used for it? For controlling Conducting heat transfer?
What if we have vaccum? Inside? Will conduction account?
How will radiation regulated?

Material Science
Criterion for being an alloy?
How can we practically differtiate brittle and ductile material without any test?
Chairman Hinted- What happens If a material is dipped in cryogenic? Then I told it will become brittle!
We have a a rod of Dia d and same wire rope of n numbers of small Dia which will fail first?

Power plant? 
What is shot peening? Where it is used in power plant?
What is supply frequency in India?
What is the rotor RPM?
What will be the Rpm for 60hz?

Tom
Differential?
What is law of gearing?
Differential if not applied, What will happen?
Which tyre will skid first?

****

NPCIL interview

Questions from Mechanics, Gears, Fluid Mechanics, Pumps, SOM

1. Which pumps will you use for high buildings
2. What is the location of the pump
3. Draw H vs Q curve for pump
4. How will you conduct UTM. Why do you take standard specimen
5. Draw bending stress distribution
6. Question related to tank and velocity
7. What is differential. Explain the mechanism
8. Design screw jack. Draw the force analysis

9. Draw FBD of a thread

Result - Shortlisted for medical

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