chemical engineering MCQs – Page 201

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

4001. A _____________ evaporator employs an annular downtake?
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A. Basket type

B. None of these

C. Long tube vertical

D. Horizontal

4002. If heat transfer rate varies with the time, it is termed as__________________?
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A. Monochromatic radiation

B. Steady state conduction

C. None of these

D. Forced convection

4003. An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________?
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A. Avoid back-trapping

B. None of these

C. Drain the liquid from the tray when the unit is not in operation

D. Allow for thermal expansion and facilitate installation

4004. In an extended surface heat exchanger, fluid having lower co-efficient________________?
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A. Should not be used as it gives very high pressure drop

B. Flows outside the tubes

C. Flows through the tube

D. Can flow either inside or outside the tubes

4005. Which of the following is not used as a medium for high temperature heating ?
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A. Mercury

B. Fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

C. Liquid metal (e.g. molten sodium)

D. Dowtherm

4006. The left face of a one dimensional slab of thickness 0.2 m is maintained at 80C and the right face is exposed to air at 30C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in C is____________________?
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A. 77.2

B. 71.2

C. 63.8

D. 48.7

4007. 1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?
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A. 400

B. 520

C. 500

D. 200

4008. Temperature profile in steady state heat transfer is________________?
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A. Asymptotic

B. Linear

C. Hyperbolic

D. Parabolic

4009. Which of the following parameters is increased by use of finned tube in a multipass shell and tube heat exchanger ?
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A. Effective tube surface area for convective heat transfer

B. All A. B. and C.

C. Tube side pressure drop and the heat transfer rate

D. Convective heat transfer co-efficient

4010. Which type of heat exchanger is preferred for heavy heat loads ?
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A. Double pipe

B. None of these

C. Series and parallel set of shell and tube

D. Plate fine

4011. The unit of heat transfer co-efficient in SI unit is____________________?
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A. W/m2K

B. W/mK

C. J/mK

D. J/M2K

4012. Correction is applied to LMTD for __________ flow?
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A. Counter

B. Parallel

C. Cross

D. None of these

4013. In a forward feed multiple effect, the pressure build up will be____________________?
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A. Highest at the outlet of the last effect

B. Least at the inlet of the first effect

C. Least at the outlet of the last effect

D. Highest at the inlet of the last effect

4014. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 10-8 W/m2.K4) ?
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A. 1000

B. 800

C. 727

D. 1200

4015. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?
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A. 48000

B. 6000

C. 60000

D. 24000

4016. A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because__________________?
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A. Boiling point elevation in a single effect system is much higher than that in any effect in a

B. Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect

C. ti-effect system

D. Total amount of vapor produced per Kg of feed steam in a multiple effect system is much

E. her than in a single effect</strong>

F. Total heat transfer area of all the effects is -less than that in a single effect evaporator system

4017. Prandtl number is given by__________________?
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A. CP ?/a

B. ?/h CP

C. CP ?/k

D. hD/k

4018. Leidenfrost point is a term concerned with the____________________?
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A. Condensation of the saturated vapor on a cold surface

B. Heat transfer between two highly viscous liquids

C. Concentration of a corrosive solution by evaporation

D. Boiling of a liquid on a hot surface

4019. A process stream of dilute aqueous solution flowing at the rate of10 Kg.s-1 is to be heated. Steam condensate at 95C is available for heating purpose, also at a rate of 10 Kg.s-1. A 1 1 shell and tube heat exchanger is available. The best arrangement is_______________?
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A. Parallel flow with process stream on shell side

B. Counter flow with process stream on shell side

C. Parallel flow with process stream on tube side

D. Counter flow with process stream on tube side

4020. What is Nusselt number ?
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A. h. CP/?

B. CP. ?/k

C. hD/k

D. CP. ?/h

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