BHEL Recruitment Paper 3

temperature is = 3270C
3. An engine operates between temperature of 9000K and T2 and another engine between T2 and
4. Internal energy of a substance depends on = Temperature
6. The unit of entropy is = J/kg 0K
7. Indicated power of a 4-stroke engine is equal to = pLAN/2
10. The spark plug gap is normally maintained at: = 0.45 to 0.6mm
13. Air fuel ratio in a jet engine is = 60:1
14. What is the value of Prandtl No.?
16. Which refrigerants has the highest critical point temperature. = Freon-11
17. Wet bulb temperature is. = indication of amount of moisture in air
19. Surface tension has the units. = newtons/m
23. The actual velocity at vena contracta for flow through an orifice from a reservoir of height H=?. =Cv√2gH
29. M.I. of a circular area about an axis perpendicular to the area is: = πr4/2
30. A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is . =450
moments at mid span will be: = wl2/8.
300rpm. Which shaft must have greater diameter.: = B
parallel, but intersect is. = Universal coupling.
41. To transmit power from one rotation shaft to another whose axes are neither parallel nor
intersecting, use: = Spiral gear.
48. The product of Cupola is called: = cast iron
50. Sintered and tungsten carbides can be machined by: = EDM
=Diamond grit.
53. The amount deducted from the salary of workers towards employees provident fund is :
=deposited in the account of worker with Provident Fund Commissioner.
54. PERT is: = event oriented technique
55. Bar charts are suitable for: = minor works.
56. on a PERT/CPM chart represents: = a significant event representing some mile-stone
57. Electron volt is the unit of : = Energy.
58. Seamless tubes are made by?
60. Why DC current is not used in transformer?
pressure energy.
resistance force of the sand?
between the two cars?

BHEL Recruitment Paper 2

1)Unit of Entropy (J/kg K or kJ/kg K)
2)A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m. What is theresistance force given by sand.
3)Ratio of specific heats of air. (1.41)
4)A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg. What is the specific gravity of the liquid.
5)Two cars travell in same direction at 40 km/hr at a regular distance. A car comes in a opposite
direction in 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between them?
7)A problem in force calculation in a body moving in a inclined surface.
8)Composition of bronze. (Copper+zinc)
9)Compostion of stainless steel.(iron+chromium+nickel+carbon)
10)CI is manifactured in which process. (cupola process)
11)What percentage of carbon is preset in pig iron. (4.5 to 6%)
12)Water is available at 10m height. What is the pressure available? (pressure=density*g*height;
p=1000*9.81*10; p=98100N/m2)
13)What will happen if the speed of the centrifugal pump doubles.
14)The unit eV is widely used in ? (Nuclear and atomic physics)
15)What will happen to the resistance, when the diameter of the conductor is doubled?
16)The power comsumed by a electrical device is 1000W at 250V, What is the resistance in the device? (Power= Voltage*current; Current=Power/Voltage, Current,I=1000/250=4 amps. V=IR, Therefore R=250/4=62.5 ohms)
17)Why DC current is not used in transformer.
18)On what principle the sonar/ radar( I dont remember) works?
19)Bending moment diagram for the UDL is in what shape?
20)Function of the distributor in petrol vehicles? (Spark timing)
21)Which is not present in CI engines? (carburrettor)
22)What will happen if one cylinder recieves more amount of fuel spray from injectors than other injectors?
23)Purpose of draft tube in hydraulic turbines? (The purpose of a draft tube is toconvert some of the kinetic energy of the flow from the runner (the rotating part of the turbine) intopressure energy and thereby increase the efficiency ofthe hydro power turbine. )
24)What is the effect or reheater in the gas turbine? (The advantage of reheater is significantly increased thrust; the disadvantage is it has very high fuel consumption and inefficiency)
25)Problems in involving with fricition coefficient.
26)Factor of safety = Yeild stress/Working stress.
27)Which is the example of non parallel power transmission (Universal coupling)
28)For perpendicular shafts worm gear is used.
29)A planet gear with 25 teeth is meshed with a sun gear of 100 teeth. Both are connected using a arm. How many rotations are needed for planet gear to complete one rotation around the sun gear?
30)What is equivalent spring constant for spring in parallel?
31) Some questions was asked related to boundry layer and vortex flow.
32) 5 questions were asked in PERT, Process planning, Product planning, Break even analysis.
33)How are tungsten and sintered composite materials are machined? (Electro Discharge Machining, EDM)

BHEL Recruitment Paper 1

1) How many links in slider crank mechanism?
2) Deflection of cantilever beam subjected to end point load?
3) Stress concentration factor Kf =?
4) What is the unit of BHN?
5) What is efficiency of riveted joint?
6) Composition of Munz metal?
7) One shaft is subjected to torque 1700 N-m having shear strength of 40Mpa. Determine the diameter?
8) A reversible engine is working between the 600F and 60F. Carnot efficiency is equal to =
9) Coefficient of restitution lies between =
10) Pectlet number is equal to = a)Re*Nu b)Re*Pr c)Re*Gr
11) Formula of effectiveness of heat transfer =
12) Emissivity depends on
13) Reynolds number formula
14) Production process for Al?
15) Thick metals welded by following processes…………
16) Logarithmic decrement is given by =
17) Magnification factor at resonance is given by =
18) Cutting forces decreases by = a) increasing rake angle b) decreasing rake angle c) increasing relief rake angle
19) Some problem on Mohr’s circle radius…
20) Volumetric strain =
21) Pendulum problem Time is given length = ?
22) For undamped system Transmission Ratio is R then a) b)
23) Which is not related to CI engine = ans) spark plug
24) Cotter joint generally fail by
25) Which coupling is used for intersecting shafts?
26) No of teeth on gear and pinion is given, center distance is given, module = ?
27) Coefficient of friction and angle is given, what is ration of tension in belt?
28) What is lamis thoerm?
29) Condition for self locking ……
30) Discontinuous chips can be produced by ………….
31) For critical speed should be a)>√2 b) >√3
32) Air at 20C blows over a hot plate 50 by 75 cm maintained at 250C. The convective heat transfer coefficient is 25W/m2. Cal the heat transfer.
33) Metacenter always lies ………….
34) Rotometer is used to measure….
35) Formula for effort of a governor……
36) Stroboscope is used to measure…..
37) What is size of A4 paper?
38) Some problem on riveted joint…..
39) Modulus of rigidity G is given by……
40) Wave properties in solids is depends on elasticity.
41) Radiation heat transfer is directly proportional to ………….
42) Escape velocity is given by √2gR
43) Kinetic energy formula….
44) Corolis component…….
45) Potent ional Energy theory is given by…………….
46) Perpendicular axis thoerm…………
47) Pappus thoerm…….
48) Center of gravity of a spherical shell……………..
49) Angle and linear dimension is given by chamfer.
50) For thick cylinders ………………..
51) N = 10 to N = 10E5 cycles then it is …. a) finite life b)infinite life
52) Value of steel young’s modulus ……
53) Endurance strength of steel equal to …………
54) Three problems on strain gauges ….
55) Three problems on vectors some related to work done….
56) Straight line mechanism…
57) Some problem springs..
58) Design on thermal stresses can be considered for a) concrete b)steel rolls c)blast furnace
59) Velocity problem it is in the vector form to find displacement?
60) Hardness is a property


BHEL Format

There are 240 questions in the paper. Out of 240 120 are Technical and other 120 are Aptitude & General English questions. There is a negative marking of 1/5th mark for each wrong answer. Five options are given for each question of which only one is correct.

The questions are very simple in Aptitude section and can be answered well if practiced well. Time management is an important factor as you have to answer 240 questions in 150 minutes.


Greatest Weekness

Disguise a strength as a weakness. 

Examples of Weaknesses:

  1. I sometimes push my people too hard. I like to work with a sense of urgency and everyone is not on the same wavelength.
  2. For my weakness, I always say that some people say I'm over-friendly. You can't go wrong with that one. Usually, the person interviewing is like "Oh, that's not a bad thing at all."
  3. I'm a little egoistic when it comes to winning things and get a little ruthless too.
  4. I lose patience sometimes when I am not in a position to complete the assigned job in time.
  5. I have to work on having more patience and giving myself a break, because I always want everything done at once.
  6. Tend to go to any limits while helping my friends.
  7. I am too focused on my work and I need to find more time to relax.
  8. I'm too focused on work and need to develop some after-hours hobbies.

Greatest Strengths


Examples of Strengths:
4.      Hard worker
5.      Punctual
6.      Determined
7.      Able to prioritize
8.      Believe in myself; self-confidence
12.  Full commitment to my work
13.  Highly energetic
14.  Love to learn new things.
15.  Having good interpersonal skills
17.  A good helper towards those who need it
19.  Optimistic approach towards life..