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SAIL CHEMICAL ENGINEERING EXAM PAPERS I SAIL MANAGEMENT TRAINEE EXAM PAPERS I SAIL MT CHEMICAL ENGINEERING EXAM PAPERS I

Steel Authority Of India Limited

Management Trainee 

SAIL Chemical Engineering Paper

Q.1.Nusselt number is the ratio of the

• temperature gradient of the wall to that across the entire pipe.
• temperature difference to the temperature gradient at the wall.
• heat flux at the wall to that across the entire pipe.
• none of these

Q.2.Fouling factor

• is a dimensionless quantity.
• does not provide a safety factor for design.
• accounts for additional resistances to heat flow.
• none of these.

Q.3.Viscosity of gases ....... with increase in temperature.

• increase very rapidly
• increase slowly
• decrease slowly
• remain unaffected

Q.4.Heat transfer co-efficient (h1) for liquids increases with

• increasing temperature
• decreasing temperature
• decreasing Reynolds number
• none of these

Q.5.At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

• 0.5
• < 0.5
• > 0.6
• < 0.1

Q.6.At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

• buffer zone
• turbulent core
• both (a) and (b)
• viscous sub-layer

Q.7.Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

• 0.1
• > 1
• < 1
• 1

Q.8.Natural convection is characterized by

• Grashhoff number
• Peclet number
• Reynolds number
• Prandtl number

Q.9.Which of the following is unimportant in forced convection ?

• Reynolds number
• Prandtl number
• Grashhoff number
• none of these

Q.10.In fored convection, the heat transfer depends on

• Re, Pr
• Re, Gr
• mainly Gr
• Re only

Q.11.The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

• Re. Gz
• Nu, Pr
• Nu, Pr, Re
• Nu, Gz

Q.12.At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

• 1
• < 1
• > 1
• none of these

Q.13.Reynold's analogy states that

• St = f/2
• St = f/4
• St = 4f
• St = f1/2

Q.14.For what value of Prandtl number, St = f/2 ?

• 1.5
• 1
• > 1
• < 1

Q.15.Which has the lowest Prandtl number ?

• Liquid metal
• Aqueous solution
• Water
• Lube oil

Q.16.Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

• for fluids in laminar flow
• for fluids in tubulent flow
• when Grashhoff number is very important
• for liquid metals

Q.17.For what value of Prandtl number, the Colburn analogy is valid ?

• 0.06 to 120
• 0.6 to 120
• 1 to 103
• 1 to 50

Q.18.Pick out the correct equation.

• jH = (St) (Pr)2/3 = f/2 
• jH = (St) (Pr)1/3 = f/2
• jH = (St)2/3 (Pr) = f/2
• jH = (St)1/3 (Pr) = f/2

Q.19.Choose the correct equation.

• Nu = (Re) (Pr) (Gz)
• Nu = (Re) (Pr) (St)
• Nu = (Re) (Pr)
• Nu = (Pr) (St)

Q.20.For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

• Nu = 0.023 Re0.8 . Pr0.4
• Nu = p/2 Gz
• Nu = 2/p Gz
• Nu = 2Gz0.5

Q.21.If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

• ha = hl
• ha = 2 hl
• ha = 0.5 hl
• ha = 0.75 hl

Q.22.When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?

• At high fluid velocity
• At low velocity
• When fluid flows past a smooth surface
• None of these

Q.23.The heat transfer co-efficient in film type condensation is ....... that for drop wise condensation.

• greater than
• lower than
• is same as
• half

Q.24.Prandtl number is the ratio of

• momentum diffusivity to mass diffusivity
• momentum diffusivity to thermal diffusivity
• thermal diffusivity to mass diffusivity
• thermal diffusivity to momentum diffusivity

Q.25.All analogy equations connecting friction factor and heat transfer co-efficient apply only to

• wall or skin friction
• form friction
• both above
• turbulent flow

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Steel Authority Of India Limited

Management Trainee

Sample Examination Paper

Q.1.Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is

• 5.7 mH
• 5.85 mH
• 6 mH
• 6.15 mH.

Q.2.In a 8085 microprocessor system with memory mapped I / 0,

• I / 0 devices have 8-bit addresses
• I / 0 devices are accessed using IN and OUT instructions
• there can be a maximum of 256 input devices and 256 output devices.
• arithmetic and logic operations can be directly performed with the I / 0 data.

Q.3.When 2-port networks are connected in parallel, which parameters convenient to use

• inverse hybrid
• open circuit impedance
• short circuit admittance
• transmission

Q.4.The number of comparators needed in a 4-bit flash type ADC is

• 32
• 8
• 14
• 15

Q.5.Line imperfection in a crystal is called

• Schottky defect
• Frenkel defect
• edge dislocation
• Miller defect.

Q.6.The frequency modulated (FM) radio frequency range is nearly

• 250 - 300 MHz
• 150 - 200 MHz
• 90 - 105 MHz
• 30 - 70 MHz

Q.7.A 10 MHz square wave clocks a 5-bit ripple counter. The frequency of third flip-flop’s output would be

• 2
• 1
• 2.5
• 1.25

Q.8.Which of the following regulator provides output voltage polarity reversal without a transformer

• Buck regulator
• Boost regulator
• Buck-boost regulator
• Cuk regulator

Q.9.The polarization required in ground wave propagation is

• Horizontal (linear)
• vertical (linear)
• Circular
• Elliptical

Q.10.If the noise figure of a receiver is 1.6, its equivalent noise temperature is

• 464.00 K
• 174.00 K
• 108.75 K
• 181.25 K

Q.11.The minimum value of the life of a transistor to be used in three section R-C phase shift oscillator is

• 54.4
• 44
• 29
• 32

Q.12.Multicavity Klystron

• is not a microwave device
• is not a good low level amplifier because of noise
• is not suitable to pulse operation
• has a high repeller voltage to insure small transit time

Q.13.The value of M in the end will be
Do 100 I = 1, 2
DO 200 J = 1, 2
M = M + I + J
200 CONTINUE
100 CONTINUE
STOP
END

• 10
• 11
• 12
• 14

Q.14.In TV system, vertical pulses are separated out from horizontal pulses by the use of

• integrator
• differentiator
• sweep credit
• sync separator

Q.15.Fourier’s series expansion of an odd periodic function contains

• sine terms only
• cosine terms only
• Both A and B
• None of the above

16. The following programme is run on an 8085 microprocessor,
Memory address in Hex Instruction
2000 LXI SP, 1000
2003 PUSH H
2004 PUSH D
2005 CALL 2050
2008 POP 2050
2009 HIT
As the completion of execution of the program, the program the program counter of the 8085 contains ………, and the stack pointer contains ……..

• 2050, OFFC
• 2251, OFFC
• 1025, OCCF
• 1025, OCCF

Q.17.200 MHz may be classified as

• VHF
• SHF
• UHF
• EHF

Q.18.The principles of homogeneity and super-position are applied to :

• linear time variant systems
• non-linear time variant systems
• linear time invariant systems
• non-linear time invariant systems.

Q.19.Dislocations in materials are

• point defect
• line defect
• planer defect
• surface defects.

Q.20.The binary representation of 5.375 is

• 111.1011
• 101.1101
• 101.011
• 111.001

Q.21.Which one out of the following instruments should be used to measure 600 kV a.c. voltages?

• Hot wire instrument
• Electrostatic voltmeter
• Moving coil voltmeter
• Moving iron voltmeter.

Q.22.For a LC parallel circuit at resonance, all the statements given below are correct except

• the line current is maximum at resonance
• the branch currents at resonance are equal
• the admittance is minimum at resonance
• the angle between the branch current is 180oC at resonance.

Q.23.The Taylor series expansion of the function F(x) = x/(1+x), around x=0 is

• x+x2+x3+x4+…….
• x+x2+x3+x4+…….
• 2x+42+8x3+16x4+…….
• x-x2+x3-x4+…….

Q.24.The mobility of electron in copper is :Given atomic weight = 63.54, density = 8.96 gm/cc, resistivity = 1.7×10–6 W-cm, Avogadro’s number = 6.025 ×1023

• 30 cm2/V-5
• 43.28 cm2/V-5
• 50 cm2/V-5
• data not sufficient

Q.25.If a square wave voltage having 5V average value is applied to a low pass filter, then average value of output is

• 10 V
• 2.5 V
• 5 V
• 0 V

Q.26.Resistivity of electrical conductors is most affected by

• temperature
• pressure
• Composition
• all of the above.

Q.27.In CCIR B-system of TV, blanking pulse is placed during

• equalizing pulse
• retrace interval between each line
• retrace period of vertical line
• none of the above.

Q.28.The capacity of a channel is

• number of digits used in coding
• volume of information it can take
• maximum rate of information transmission
• bandwidth required for information

Q.29.Sometimes microwave signals follow the earth’s curvature. This due to

• Ionospheric reflection
• Faraday rotation
• Ducting
• Ionospheric scatter.

Q.30.The function of diplexers bridge in a TV transmitter is

• to prevent the loading of several transmitters by video transmitter
• to increase the bandwidth
• to increase the power output
• to increase the efficiency of transmission.

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