Mock Exam: KPSC MOCK TEST KPSC QP 237 2023 LECTU…

1

The active component of catalyst used in steam reforming of methane to produce synthesis gas is

2

When does pressure intensity of the fluid would be same in all the directions?

3

How does pressure and power requirements relate to the gas density of a gas fan at a constant velocity and capacity?

4

How slugging in a fluidized bed can be avoided?

5

What is the suitable example for variable orifice flowmeter?

6

What is the drag coefficient of a bacterium (assume the size of 1

\mu m

) moving in water at the speed of 1 mm/s? (Assume the kinematic viscosity is

\nu

/s)

7

Which of the following factors influence the decrease in the pressure of a fluid when flows under isothermal turbulent condition?

8

Two parallel plates shear a Bingham fluid, with the bottom plate moving at 0.5 m/s and the top plate at 1.5 m/s in the same direction. The plate gap is 1 mm. Let the yield stress be 10 Kpa. What is the shear stress on the plates? Assume the dynamic viscosity as 10 Pas.

9

How the efficiency of the sedimentation tank (constant discharge rate) can be increased?

10

Centrifugal pumps are not recommended for which of the following fluids?

11

A screening operation is used to separate a particulate mixture into undersize and oversize fractions. If the feed contains 20% undersize particles by mass and the screen effectiveness for the undersize fraction is 80%, what is the percentage of undersize in the undersize product?

12

Which of the following combinations of filter cake properties can provide the maximum filtration rate in an industrial filtration process?

13

A spherical particle is settling freely in a fluid under gravity. Keeping all other parameters constant, which of the following will most significantly increase the terminal settling velocity of the particle?

14

If the energy required to reduce the particle size of a feed whose 80% pass through a mesh of diameter 25 mm to a product whose 80% pass through a mesh of diameter 4 mm based on Bond's law is 20 kWh/ton, which of the following closely estimates the energy required to further reduce the particle size such that 80% pass through a mesh of diameter 1 mm?

15

Which of the following is a close estimate of the settling velocity in mm/s of a 50μ spherical particle of density 3700 kg/m³ settling in water at 20°C?

16

Which of the following is true for a particle reaching terminal velocity?

17

Which of the following influences the extent of separation in an industrial sorting classifier?

18

For a pile of granular solids, the angle of repose is lower than the angle of internal friction when

19

The collection efficiency of a cyclone separator

20

The drag coefficient for a particle of diameter 4 mm and density 2500 kg/m³ settling at a velocity of 1.5 m/s in a stagnant fluid of density 1000 kg/m³ and viscosity 0.01 Pa.s is

21

Trouton's ratio is defined as the fraction of

22

Carbon black is produced by decomposition of methane as follows: The single pass conversion of methane is 60%. If the fresh feed is pure methane and 25% of the methane exiting the reactor is recycled, then calculate the molar ratio of fresh feed stream to recycle stream

23

Find the normality of 98 grams/liter H2SO4

24

An evaporator is used to concentrate a liquor from 10 to 50 percent solids by weight. If the feed rate of the weak liquor is 1000 kg/h, determine the water evaporated in kg/h.

25

Carbon monoxide combines with chlorine in the presence of a suitable catalyst to form phosgene according to the following reaction. After reaction, the products contained 12 moles of phosgene, 4 moles of chlorine and 10 moles of carbon monoxide. Assuming that the original mixture is free of phosgene, calculate the percentage conversion of the limiting reactant

26

The ultimate analysis of coal gives

27

Recycle streams will have purging operation for

28

The heat of combustion of methane, carbon and hydrogen are given. Find the heat of formation of methane?

29

The ratio of actual partial pressure exerted by the vapour to its vapour pressure at the same temperature, expressed as a percentage is called

30

The scale that is used to indicate the strength of sugar solution is

31

Which of the following statement is/are true?\ni. Heat interaction is a path function\nii. Enthalpy change associated with a chemical reaction can be measured with a flow calorimeter\niii. Throttling process is an isenthalpic process

32

Ratio of fugacity to pressure is known as

33

Determine the minimum amount of power required to maintain the temperature of a solution at 200K, when 100 kJ of heat per second is continuously removed from it. Consider the temperature of its surrounding as 300 K

34

All spontaneous processes are

35

The following are the relations between activity coefficient (

\gamma

) and mole fraction (

x

) of a binary mixture at constant temperature and pressure. Pick the thermodynamically consistent relations

36

Identify the equation that is used to express the excess Gibbs free energy of a binary mixture, where its combinatorial part considers the composition, size and shape of the constituent molecules; and the residual part takes care of the intermolecular forces

37

The composition of a reaction mixture at the point where the Gibbs free energy is __________ is the equilibrium composition at the specified temperature and pressure.

38

Consider a reaction with standard free energy change

\Delta G^\circ = 200

kJ/kmol. Choose the most appropriate statement regarding the feasibility of this reaction.

39

Consider two species a and b. The partial molar enthalpy of species a in the binary mixture is

\bar{H}_a = 100 - 150x_b^2

, where

x_a

and

x_b

are the mole fractions of species a and b, respectively. Determine the partial molar enthalpy of species a at infinite dilution.

40

The term representing the net energy cost for a system created at a constant environmental temperature from a negligible initial volume after subtracting what the environment automatically supplied

41

Critical thickness of insulation of a spherical shell is given by

42

The heat conduction in a composite slab consist of two materials as shown in figure. Which of the following statement is true if the thermal conductivities of the materials are

k_1

and

k_2

respectively

43

The distance from the leading edge of a flat plate at which the transition will occur for a flow of water with a uniform velocity of 1 m/s is (transition Reynolds Number for flow over a flat plate is

5 \times 10^5

and kinematic viscosity,

v = 0.858 \times 10^{-6} m^2/s

)

44

The ratio of the thickness of thermal boundary layer to the thickness of hydro dynamic boundary layer is equal to (Prandtl number)

^{-n}

, where

n

is

45

Consider two black bodies with surfaces

A_1

(area =

1m^2

) and

A_2

(area =

6m^2

). They exchange heat only by radiation, 60% of the energy emitted by

A_1

is received by

A_2

. The fraction of energy emitted by

A_2

that is received by

A_1

is

46

Which of the following statements are true in the case of an ideal black body? (P) The emissivity of black body radiation is 1. (Q) The radiation emitted by a black body is of different wavelengths lying in regions of ultraviolet, visible and infrared (R) The transmittivity of black body is 1. (S) The black body radiation curve at different temperature peaks at a wavelength is directly proportional to temperature

47

For turbulent flow in a pipe, assuming Seider-Tate correlation is valid, the heat transfer coefficient varies with the pipe diameter D as

48

A copper ball of 5 cm diameter at 300°C is suddenly immersed in water at 30°C. It cools down to 150°C in 70s. It is then reheated to the initial temperature of 300°C and suddenly exposed to air at 30°C where it cools down to 150°C in 200s. The difference in cooling time is due to

49

An electrically heated element is submerged in a pool of water at its saturation temperature. As the temperature of the element increases the Leidenfrost point is observed at

50

A current of 200 A is passed through a stainless steel wire [k = 19 W/m °C] 2mm in diameter. The resistance of the steel wire may be taken as 0.1 Ω. And the length of the wire is 1 m. The wire is submerged in a liquid at 110°C and experiences a convection heat transfer coefficient of 4 kW/m

^2

. °C. The center temperature of the wire is

51

In the case of mass transfer between two phases in contact, when the two phases attain equilibrium

52

The concentration distribution for diffusion of A through stagnant B under steady state is

53

Pick out incorrect statement from the following

54

In the case of simultaneous heat and mass transfer occurring in boundary layer flow, the temperature and concentration profiles are identical when

55

Which of the following dryers is suitable for drying a feed in the form of solution into a dried particulate product in a single operation?

56

Which of the following is true in the case of solvents used in liquid-liquid extraction?

57

Which of the following factors are favourable for leaching operation?

58

In the case of absorption of solute from gas phase to liquid phase, if the solute is readily soluble in the liquid

59

Which of the following is applicable to chemical adsorption?

60

Identify correct statement out of the following.

61

Match the process in Group I with the catalyst in Group II Group I P. Fischer-Tropsch Synthesis Q. Formaldehyde from methanol R. Hydrogenation of vegetable oil S. Dehydrogenation of Ethyl benzene Group II I. Nickel II.

Fe_2O_3

/

ZnO

III. Silver IV. Cobalt

62

In petroleum refining, catalytic reforming is used to convert

63

Match the polymer in Group I to the polymer characteristics in Group II Group I P. Polyethylene Q. Phenol-formaldehyde R. Polyisoprene S. Polyester Group II I. Elastomer II. Fiber III. Thermoplastic IV. Thermosetting

64

Which one of the following sequences is arranged according to increasing calorific value?

65

Hydrotreating is used for

66

For making superphosphate by acidulation of phosphate rock, use of nitric acid is desirable, because

67

Match the product in Group I to the raw material in Group II Group I P. Ethylene Q. Methanol R. Phthalic anhydride Group II 1. Natural gas 2. Synthesis gas 3. Naphtha 4. Naphthalene

68

Which of the following is detergent?

69

Which of the following is not employed in the commercial production of linear PVC?

70

Methanator is used in the ammonia plant for _____________.

71

Fertilizer produced during soda ash manufacture by dual process is ammonium

72

H_3PO_4

is the chemical formula of _________ phosphoric acid.

73

Which of the following is desirable in gasoline but undersirable in kerosene?

74

Match each of the polymers in Group I with raw material in Group II, from which they are made. Group I P. Polyester Q. Polyamide R. Viscose Rayon S. Epoxy resin Group II I. Ethylene Glycol II. Adipic acid III. Cellulose IV. Bisphenol

75

Styrene is produced from ethyl benzene by the process of

76

Which process is widely used to treat all types of woods to pulp?

77

Nylon 66 is so named because

78

The commonly used solvent in supercritical extraction is

79

Commercially, ethylene is produced from naphtha by

80

Which among the following represents dynamic characteristics of an instrument?

81

Which of the following thermocouples are used for high temperature measurement?

82

Which of the following regarding the response of manometers for a step change is correct

83

The law stated as "the algebraic sum of the thermal emf's in a circuit composed of any number of dissimilar metals is zero, if all the circuit is at a uniform temperature" is called as

84

The inverse Laplace transform of the function F(s) given below is

85

In an on/oﬀ controller the gain Kc is made

86

Which of the following statement is true regarding a PI controller?

87

An explosion in which reaction front moves at a speed greater than the speed of sound in an unreacted medium is called

88

Class E ﬁre is produced due to

89

The degree to which an instrument indicate the changes in measured variable without dynamic error is called

90

Trickling ﬁlter is an

91

Blue Baby syndrome is due to the presence of excess _______ in drinking water.

92

BOD is used as a characteristic of

93

The angle between the solar collector surface plane and the horizontal plane is called

94

Main product obtained from fermentation of biomass is

95

Permanent hardness of water can be removed by

96

Electrodialysis removes

97

The permissible pH of drinking water is

98

Which of the following is not a method of disinfection of water?

99

What is the power in wind, if velocity of the wind is 20 m/s and the blade length is 60 m. Assume air density as 1.23 kg/

m^3

KPSC Mock Test: Lecturer in Chemical Engineering -Technical Education

KPSC Mock Test: Lecturer in Chemical Engineering -Technical Education