Oil and Natural Gas Corporation Limited Chemistry previous year question papers

Will you please share with me the Oil and Natural Gas Corporation Limited Chemistry previous year question papers?

[Raman Vij]

As you want to get the Oil and Natural Gas Corporation Limited Chemistry previous year question papers so here it is for you:

1 During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be
A) circular Interpolation — clockwise
B) circular Interpolation — counterclockwise
C) linear Interpolation
D) rapid feed
Answer : (A)

2 A component can be produced by any of the four processes I, II, III and IV. Process I has a fixed cost ofRs. 20 and variable cost of Rs. 3 per piece. Process II has a fixed cost Rs. 50 and variable cost of Re. 1 per piece. Process III has a fixed cost of Rs. 40 and variable cost of Rs. 2 per piece. Process IV has a fixed cost of Rs. 10 and variable cost of Rs. 4 per piece. If the company wishes to produce 100 pieces of the component, from economic point of view it should choose
A) Process I
B) Process II
C) Process III
D) Process IV
Answer : (B)

3 In an interchangeable assembly, shafts of size 25.000+0.040mm mate with holes of size 25.000+0.020 mm. The maximum possible clearance in the assembly will be
A) 10 microns
B) 20 microns
C) 30 microns
D) 60 microns
Answer : (D)

4 A company has two factories S1, S2 and two warehouses D1, D2. The supplies from S1 and S2 are 50 and 40 units respectively. Warehouse D1 requires a minimum of 20 units and a maximum of 40 units. Warehouse D2 requires a minimum of 20 units and, over and above, it can take as much as can be supplied. A balanced transportation problem is to be formulated for the above situation. The number of supply points, the number of demand points, and the total supply (or total demand) in the balanced transportation problem respectively are
A) 2, 4, 90
B) 2, 4, 110
C) 3, 4, 90
D) 3, 4, 110
Answer : (C)

5 An incompressible fluid (kinematic viscosity, 7.4 x 10-7 m2/s, specific gravity, 0.88) is held between two parallel plates. If the top plate is moved with a velocity of 0.5 m/s while the bottom one is held stationary, the fluid attains a linear velocity profile in the gap of 0.5 mm between these plates; the shear stress in Pascals on the surface of top plate is
A) 0.651 x 10-3
B) 0.651
C) 6.51
D) 0.651 x 103
Answer : (B)

6 The tool of an NC machine has to move along a circular arc from (5,5) to (10,10) while performing an operation. The centre of the arc is at (10,5). Which one of the following NC tool path commands performs the above mentioned operation?
A) N010 G02 X10 Y10 X5 Y5 R5
B) N010 G03 X10 Y10 X5 Y5 R5
C) N010 G01 X5 Y5 X10 Y10 R5
D) N010 G02 X5 Y5 X10 Y10 R5
Answer : (D)

7 During a Morse test on a 4 cylinder engine, the following measurements of brake power were taken at constant speed.
All cylinders firing 3037 kW
Number 1 cylinder not firing 2102 kW
Number 2 cylinder not firing 2102 kW
Number 3 cylinder not firing 2100 kW
Number 4 cylinder not firing 2098 kW
The mechanical efficiency of the engine is
A) 91.53%
B) 85.07%
C) 81.07%
D) 61.22%
Answer : (C)

8 In terms of theoretical stress concentration factor (Kt) and fatigue stress concentration factor (Kf ), the notch sensitivity ‘q’ is expressed as
A) (Kf -1) (Kt -1)
B) (Kf -1) (Kt +1)
C) (Kt -1) (Kf -1)
D) (Kf +1) (Kt +1)
Answer : (A)

9 Starting from x0 = 1, one step of Newton-Raphson method in solving the equation x3 + 3x -7 = 0 gives the next value (x1) as
A) x1 = 0.5
B) x1= 1.406
C) x1= 1.5
D) x1 = 2
Answer : (C)

10 The S-N curve for steel becomes asymptotic nearly at
A) 103 cycles
B) 104 cycles
C) 10 6 cycles
D) 10 9 cycles
Answer : (C)

11. In PERT analysis a critical activity has
A) maximum Float
B) zero Float
C) maximum Cost
D) minimum Cost
Answer : (B)

12 Environment friendly refrigerant R134a is used inthe new generation domestic refrigerators. Itschemical formula is
A) CH C1 F2
B) C2 C13 F3
C) C2 C12 F4
D) C2 H2 F4
Answer : (D)

13 A solid cylinder (surface 2) is located at the centreof a hollow sphere (surface 1). The diameter of the sphere is 1m, while the cylinder has a diameter and length of 0.5 m each. The radiation configuration factor F11 is
A) 0.375
B) 0.625
C) 0.75
D) 1
Answer : (C)

14 For a fluid flow through a divergent pipe of length L having inlet and outlet radii of R1 and R2 respectively and a constant flow rate of Q, assuming the velocity to be axial and uniform at any cross-section, the acceleration at the exit is
A) 2Q(R1 - R2) p LR23
B) 2Q2 (R1 - R2) p LR23
C) 2Q2 (R1 - R2) p2LR25
D) 2Q2 (R2 - R1) p2LR25
Answer : (C)

15 An incompressible fluid (kinematic viscosity, 7.4 x 10-7 m2/s, specific gravity, 0.88) is held between two parallel plates. If the top plate is moved with a velocity of 0.5 m/s while the bottom one is held stationary, the fluid attains a linear velocity profile in the gap of 0.5 mm between these plates; the shear stress in Pascals on the surface of top plate is
A) 0.651 x 10-3
B) 0.651
C) 6.51
D) 0.651 x 103
Answer : (B)

16 The tool of an NC machine has to move along a circular arc from (5,5) to (10,10) while performing an operation. The centre of the arc is at (10,5). Which one of the following NC tool path commands performs the above mentioned operation?
A) N010 G02 X10 Y10 X5 Y5 R5
B) N010 G03 X10 Y10 X5 Y5 R5
C) N010 G01 X5 Y5 X10 Y10 R5
D) N010 G02 X5 Y5 X10 Y10 R5
Answer : (D)

17 During a Morse test on a 4 cylinder engine, the following measurements of brake power were taken at constant speed.
All cylinders firing 3037 kW
Number 1 cylinder not firing 2102 kW
Number 2 cylinder not firing 2102 kW
Number 3 cylinder not firing 2100 kW
Number 4 cylinder not firing 2098 kW
The mechanical efficiency of the engine is
A) 91.53%
B) 85.07%
C) 81.07%
D) 61.22%
Answer : (C)

18 In terms of theoretical stress concentration factor(Kt) and fatigue stress concentration factor (Kf ), the notch sensitivity ‘q’ is expressed as
A) (Kf -1) (Kt -1)
B) (Kf -1) (Kt +1)
C) (Kt -1) (Kf -1)
D) (Kf +1) (Kt +1)
Answer : (A)

19 Starting from x0 = 1, one step of Newton-Raphson method in solving the equation x3 + 3x -7 = 0 gives the next value (x1) as
A) x1 = 0.5
B) x1= 1.406
C) x1= 1.5
D) x1 = 2
Answer : (C)

20 A maintenance service facility has Poisson arrival rates, negative exponential service time and operates on a ‘first come first served’ queue discipline. Break downs occur on an average of 3 per day with a range of zero to eight. The maintenance crew can service an average of 6 machines per day with a range of zero to seven. The mean waiting time for an item to be serviced would be
A) 16 day
B) 13 day
C) 1 day
D) 3 days
Answer : (A)

21 The S-N curve for steel becomes asymptotic nearly at
A) 103 cycles
B) 104 cycles
C) 106 cycles
D) 109 cycles
Answer : (C)

22 In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be
A) 5 mm
B) 39 mm
C) 78mm
D) 120mm
Answer : (A)

23 Water at 42°C is sprayed into a stream of air at atmospheric pressure, dry bulb temperature of 40°C and a wet bulb temperature of 20°C. The air leaving the spray humidifier is not saturated. Which of the following statements is true?
A) Air gets cooled and humidified
B) Air gets heated and humidified
C) Air gets heated and dehumidified
D) Air gets cooled and dehumidified
Answer : (B)

24 The angle between two unit-magnitude coplanar vectors P(0.866, 0.500,0) and Q(0.259, 0.966,0) will be
A) 0°
B) -30°
C) 45°
D) 60°
Answer : (C)

25 A lot has 10% defective items. Ten items are chosen randomly from this lot. The probability that exactly 2 of the chosen items are defective is
A) 0.0036
B) 0.1937
C) 0.2234
D) 0.3874
Answer : (B)

26 Stokes theorem connects
A) a line integral and a surface integral
B) a surface integral and a volume integral
C) a line integral and a volume integral
D) gradient of a function and its surface integral
Answer : (A)

27 A solar collector receiving solar radiation at the rate of 0.6 k W/m2 transforms it to the internal energy of a fluid at an overall efficiency of 50%. The fluid heated to 350 K is used to run a heat engine which rejects heat at 313 K. If the heat engine is to deliver 2.5 kW power, the minimum area of the solar collector required would be
A) 8.33m2
B) 16.66m2
C) 39.68m2
D) 79.36m2
Answer : (D)

28 When the temperature of a solid metal increases,
A) strength of the metal decreaes but ductility increases
B) both strength and ductility of the metal decrease
C) both strength and ductility of the metal increase
D) strength of the metal increases but ductility decreases
Answer : (A)

29 A company produces two types of toys: P and Q. Production time of Q is twice that of P and the company has a maximum of 2000 time units per day. The supply of raw material is just sufficient to produce 1500 toys (of any type) per day. Toy type Q requires an electric switch which is available @ 600 pieces per day only. The company makes a profit of Rs. 3 and Rs. 5 on type P and Q respectively. For maximization of profits, the daily production quantities of P and Q toys should respectively be
A) 100, 500
B) 500, 1000
C) 800, 600
D) 1000, 1000
Answer : (C)

30 A spherical thermocouple junction of diameter 0.706 mm is to be used for the measurement Aof temperature of a gas stream. The convective heat transfer co-efficient on the bead surface is 400 W/m2K. Thermophysical properties of thermocouple material are k = 20 W/mK, C = 400 J/kg K and r = 8500 kg/m3. If the thermocouple initially tot 30°C is placed in a hot stream of 300°C, the time taken by the bead to reach 298°C, is
A) 2.35 s
B) 4.9 s
C) 14.7 s
D) 29.4 s
Answer : (B)

31 In a spring-mass system, the mass is 0.1 kg and the stiffness of the spring is 1 kN/m. By introducing a damper, the frequency of oscillation is found to be 90% of the original value. What is the damping coefficient of the damper?
A) 1.2 N.s/m
B) 3.4 N.s/m
C) 8.7 N.s/m
D) 12.0 N.s/m
Answer : (C)

32.In a machining operation, doubling the cutting speed reduces the tool life to 1/8 of the original value. The exponent n in Taylor
A) 1/8
B) 1/4
C) 1/3
D) 1/2
Answer : (C)

33.In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be
A) 5 mm
B) 39 mm
C) 78 mm
D) 120 mm
Answer : (A)

34.A soldering operation was work-sampled over two days (16 hours) during which an employee soldered 108 joints. Actual working time was 90% of the total time and the performance rating was estimated to be 120 percent. If the contract provides allowance of 20 percent of the total time available, the standard time for the operation would be
A) 8 min
B) 8.9 min
C) 10 min
D) 12 min
Answer : (D)

35. A welding operation is time-studied during which an operator was pace-rated as 120%. The operator took, on an average, 8 minutes for producing the weld-joint. If a total of 10% allowances are allowed for this operation, the expected standard production rate of the weld-joint (in units per 8 hour day) is
A) 45
B) 50
C) 55
D) 60
Answer : (A)

36. In PERT analysis a critical activity has
A) maximum Float
B) zero Float
C) maximum Cost
D) minimum Cost
Answer : (B)

37.Environment friendly refrigerant R134a is used in the new generation domestic refrigerators. Its chemical formula is
A) CH C1 F2
B) C2 C13 F3
C) C2 C12 F4
D) C2 H2 F4
Answer : (D)

38. The parabolic arc y = x, 1 ≤ x ≤ 2 is revolved around the x-axis. The volume of

the solid of revolution is

(A)

4

π

(B)

2

π

(C)

3

4

π

(D)

3

2

Π

39. A moist air sample has dry bulb temperature of 30ºC and specific humidity of

11.5g water vapour per kg dry air. Assume molecular weight of air as 28.93. If

the saturation vapour pressure of water at 30ºC is 4.24kPa and the total pressure

is 90kPa, then the relative humidity (in %) of air sample is

(A) 50.5 (B) 38.5 (C) 56.5 (D) 68.5

40. The value of the integral 2

dx

1 x

∞

−∞ + ∫ is

(A) −π (B)

2

π

− (C)

2

π

(D) π

Will you please provide the Oil and Natural Gas Corporation Limited Chemical Engineering exam question paper ?

[Arun Vats]

Here I am providing the list of few questions of Oil and Natural Gas Corporation Limited Chemical Engineering exam question paper which you are looking for .
1. In determining the overall order of irreversible reactions from the half-life method, the fractional conversion in a given item for a first-order reaction

(a) rises with increased concentration

(b) decreases with increased concentration

(c) is independent of initial concentration

(d) is indeterminate

2. Consider two competing reaction 2A + B = X and A + B = Y in which X is the desired product and Y is a by product. Further, reagent B is in large excess and the rate of the X-forming reaction varies as the square of the concentration of A; and the rate of the Y-forming reaction varies as its first power. For these reactions the yield of is X increased

(a) at higher concentration of A

(b) at higher concentration of B

(c) at higher concentration of X

(d) at higher concentration of Y

3. Which one of the following graphs represents the effect of temperature on the initial reaction rate of a catalyzed gas reaction (at constant catalyst activity) ?

(a)

(b)

(c)

(d)

4. Peclet number is equal to be

(a) product of Reynold's number and Prandtl number

(b) product of Grashoff number and Sherwood number

(c) ratio of Nusselt number and Prandtl number

(d) ratio of Sherwood number and Prandtl number


5. An auto-catalytic reaction is to be carried out at constant temperature. Which one of the following combination of reactors would be required for optimum conversion?

(a) PFR followed by a CSTR

(b) CSTR followed by a PFR

(c) Two CSTR is series

(d) Two PFR is series

6. For an isothermal reaction carried out in a plug flow reactor, the final conversion can be matched by a CSTR sequence of n reactor if

(a) n = 2

(b) n = 3

(c) n = 5

(d) n > 5

7. For isothermal catalytic kinetics, a very low value of Thiele modulus indicates

(a) exclusive pore diffusion control

(b) exclusive chemical reaction control

(c) mixed control

(d) external diffusion control

8. An irreversible reaction, 2A + B proceeds under steady state conditions in a plug flow reactor. Which one of the following would lead to higher conversion?

(a) Pressure progression from a small value

(b) A temperature progression

(c) High temperature and pressure progression from a large value

(d) High pressure and temperature progression from an average value

9. Which one of the following pairs is correctly matched?

A. Cooling towers 1. Heat transfer area

B. Tube and shell heat exchanger 2. Power input

C. Packed colomns 3. Diameter

D. Evaporators 4. Residence time


A B C D

(a) 3 4 2 1

(b) 4 3 1 2

(c) 2 1 3 4

(d) 4 3 2 1

10. Match List I with List II and select the correct answer using the codes given below the Lists

List I

A. Utilities

B. Biochemical oxygen demand

C. Storage

D. Plant operation and control


List II

1. Floating roof tank

2. Computer

3. Steam

4. Waste treatment

A B C D

(a) 3 4 2 1

(b) 4 3 1 2

(c) 3 4 1 2

(d) 4 3 2 1

11. The total capital investment in a chemical plant is equal to the sum of

(a) fixed capital and working capital

(b) working capital and direct cost

(c) working capital and indirect cost

(d) direct and indirect cos

12. The total product cost is the sum of the

(a) direct production cost and fixed chages

(b) manufacturing costs & general expenses

(c) general expenses and fixed charges

(d) direct production cost & general expenses

13. Catalyst used in desulphurization of naphtha is

(a) cobalt ─ molybdenum

(b) platinum ─ rhodium

(c) silica gel

(d) nickel

14. The body parts of vessel are heated by means of steam or hot water, then the design temperature for the body parts should be

(a) the temperature of heating media

(b) 100 C higher than the maximum temperature that any part of the body is likely to attain in course of operation

highest temperature of the heating media attained

(c) 100 C below than the highest temperature of the heating media attained

(d) dependent on the material of construction of the vessel

15. Monel, an alloy of nickel which is used in the umber of chemical fabrication equipment, contains

(a) 67% nickel and 30% copper

(b) 80% nickel and 20% copper

(c) 90% nickel and and 10% chromium

(d) 77% nickel and 23% chromium

16. Which one of the following is classed as anionic detergent ?

(a) sodium carboxy cellulose

(b) aryl-benzene sulfonate

(c) sodium tripolyphosphate

(d) sodium silicate

17. Superphosphate is manufactured by reacting

(a) phosphorous with sulphuric acid

(b) phosphorous with phosphoric acid

(c) phosphate rock with phsophoric acid

(d) phosphate rock with sulphuric acid

18. The yield of products of coal carbonisation at 5000 - 7000 are

(a) soft coke, gas tar and benzole

(b) coke, gas, tar and benzole

(c) coke, gas, tar and ammonium sulphate

(d) soft, coke, gas, tar & ammonium sulphate

19. Which one of the following set is called anticorrosive pigments ?

(a) Zinc, chrome and basics lead sulphate

(b) Titanium dioxide and ultramarine blue

(c) Zinc oxide and white lead

(d) Chromium oxide and carbon black

20. Natural gas is a

(a) product of hydro carbon cracking

(b) refinery waste product

(c) petroleum distillation product

(d) oil-well product

21. Which one of the following thermocouple is used for the measurement of temperature in the range of 7000 - 17000 C?

(a) Platinum ─ Rhodium

(b) Chromel ─ Alumel

(c) Iron ─ constantan

(d) Copper ─ constantan

22. Chalcopyrites is a mineral for

(a) copper

(b) zinc

(c) lead

(d) nickel

23. Demineralised water can be obtained by

(a) Soda - lime process

(b) cation exchange resin

(c) anion exchange resin

(d) combination of cation and anion exchange resin

24. Which one of the following sets of combustible materials are arranged in increasing order of their calorific value?

(a) Anthracite, kerosene, lignite and ethyl alcohol

(b) Lignite, anthracite, ethyl alcohol and kerosene

(c) Ethyl alcohol, anthracite, lignite and kerosene

(d) Kerosene, lignite, ethyl alcohol and anthracite

Directions : The following 10 (Ten) items consist of two statements, one labelled as the 'Assertion (A)' and the other as 'Reason (R)', You are to examine these two statements carefully and select the answers to these items using the codes given below :

Codes :

(a) Both A and R are individually true and R is the correct explanation of A

(b) Both A and R are individually true but R is NOT the correct explanation of A

(c) A is true but R is false

(d) A is falsebut R is tru

25. Assertion (A) : Flanged joints are used to facilitate erection and dismantling

Reason (R) : Flanged joints can be used for all sizes of pipe

26. Assertion (A) : Both vapour and liquid stream entering an ideal stage are in equilibrium

Reason (R) : An ideal stage is characterized by thorough mixing of entering streams

27. Assertion (A) : PI control reduced the offset

Reason (R) : PI control leads to oscillations compared to proportional action alone

28. Assertion (A) : Baffles are provided in the shell side of the shell and tube heat exchanger to improve heat transfer

Reason (R) : Baffles increase turbulence in the shell side fluid

29. Assertion (A) : Degree of freedom of ice-water-water vapours system at equilibrium is zero

Reason (R) : Phase rule is given by,

F = C - P + 2.

20. Assertion (A) : The thickness of the laminar part of the boundary layer decreases once the turbulence region begins

Reason (R) : The thickness of the boundary layer in the turbulent region consists of laminar part and turbulent part

21. Assertion (A) : The same integral equations that hold for a batch reactor will also be true for a longitudinal flow reactor

Reason (R) : The time that it takes an element of the fluid to flow through the longitudinal reactor is the same as the contact time in a batch rector

22. Assertion (A) : Only a small amount of make-up water is required in a cooling tower

Reason (R) : The leakage of water during operation of the cooling tower is very small

23. Assertion (A) : The function of the spiral stirrer in Swenson Walker crystallizer is not especially that of either agitation or conveying the crystals.

Reason (R) : Stirrer prevents accumulation of crystals on the cooling surface

24. Assertion (A) : Double pipe heat exchange is preferred when heat exchanger surface area requirement is small

Reason (R) : Its construction is simple, maintenance easy, and it is economical to use.

25. Assertion (A) : For an ideal gas, the gas constant R is equal to

(a) Work/Temperature

(b) Work/Pressure

(c) Force x length/Volume

(d) Pressure/Work

26. In order to determine the heat loss by thermal radiation between two infinitely parallel gray plates, the emissivity factor 'Fe' is given by (e1 and e2 have their usual meaning)

27. The vacuum in evaporators is produced by

(a) steam ejectors

(b) barometric leg

(c) catch - all

(d) steam trap

28. The finned tube heat exchangers are used for

(a) condensing saturated vapours

(b) vaporising liquids

(c) heating and cooling of highly viscous liquids

(d) heating & cooling of common gases

29. The baffles in shell and tube heat exchangers are used to

(a) create turbulence in tube side fluid

(b) create turbulence in shell side fluid

(c) create tubulence in both shell and tube side fluids

(d) increase the surface area of heat transfer

30. In the case of heat transfer to boiling liquids, the heat flux q/A varies with temperature difference ∆t and goes through a minimum after the peak heat fl' at a point. This point is known as

(a) Knudsesn point

(b) Biot point

(c) Leidensfrost point

(d) Wien's point

31. Prandtl number is the ratio of

(a) thermal diffusivity to momentum diffusivity

(b) momentum diffusivity to thermal diffusivity

(c) thermal diffusivity to molecular diffusivity

(d) molecular diffusivity to momentum diffusivity

32. The units of volumetric mass-transfer coefficient is

(a) kg mol / (hr.m2.atm)

(b) kg mol / (hr.m.atm)

(c) kg mol / (hr.m3.atm)

(d) kg mol / (hr.m2.0C)

33. In the design of plate absorbed (mass transfer from gas to liquid) a theoretical or ideal tray is defined as one wherein the average composition of all the

(a) gas and liquid entering the tray are in equilibrium with each other

(b) gas and liquid leaving the tray are in equilibrium with each other

(c) gas entering and all the liquid leaving the tray are in equilibrium with each other

(d) gas leaving and all the liquid leaving the tray are in equilibrium with each other

34. The 'entrainer' added for azeotropic distillation of the binary mixture ethanol-water system is

(a) carbon tetrachloride

(b) xylene

(c) benzene

(d) isopropyl ether


35. The most important reason for using copper tubes in heat exchangers is

(a) high thermal conductivity

(b) high corrosion resistance

(c) high rigidity

(d) low resistance offered to fluid flow


36. The concept of flooding velocity is commonly employed to determine the tower diameter in

(a) plate type distillation columns

(b) wetted wall towers for absorption

(c) packed absorption columns

(d) rotary driers as drying equipments


37. Which of the following parameters affect the magnitude of eddy diffusivity during mass transfer in turbulent flow?

1. Mean free path of the molecules

2. Average linear velocity of the molecules

3. Prandtl mixing length

4. Deviating velocity

Select the correct answer using the codes given below :

(a) 1, 2 and 3

(b) 2 and 3

(c) 3 and 4

(d) 2 and 4


38. Which of the following parameters affect the rate of drying in non-porous solids?

1. Velocity of air

2. Temperature of the air

3. Humidity of air

4. Diffusivity value of moisture through the solid

Select the correct answer using the codes given below :

(a) 1, 2 and 3

(b) 2 and 3

(c) 3 and 4

(d) 1 and 4


39. The hydrodynamic and thermal boundary layers of a liquid flowing over a heater plate

(a) are identical, if Prandtl number = 1

(b) are identical, if Prandtl number < 1

(c) are identical, if Prandtl number > 1

(d) cannot be identical


40. A gas will approach ideal behavior at

(a) low temperature and low pressure

(b) low temperature and high pressure

(c) high temperature and low pressure

(d) high temperature and high pressure