Latest Chemical Engineering MCQs – Chemical Heat Transfer MCQs

Latest Chemical Engineering MCQs – Chemical Heat Transfer MCQs

This post is comprising of latest ” Chemical Heat Transfer MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.

Latest Chemical Engineering MCQs

By practicing these MCQs of Chemical Heat Transfer MCQs – Latest Competitive Chemical Engineering MCQs , an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to Chemical Heat Transfer Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Chemical Heat Transfer Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.

Latest Chemical Heat Transfer Mcqs

The most occurred mcqs of Chemical Heat Transfer in past papers. Past papers of Chemical Heat Transfer Mcqs. Past papers of Chemical Heat Transfer Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Chemical Heat Transfer Mcqs. The Important series of Chemical Heat Transfer Mcqs are given below:

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?

A. Maximum
B. Minimum
C. Zero
D. Infinity

Log mean temperature difference (LMTD) cannot be used, if ___________________?

A. There exists an unsteady state
B. Heat transfer co-efficient over the entire heat exchanger is not constant
C. The heat capacity is not constant and there is a phase change
D. None of these

Kirchoff‟s law applies to _____________ radiation?

A. Monochromatic
B. Total
C. Both A. & B.
D. Neither A. nor B.

Steam traps are provided in steam carrying pipelines to_________________?

A. Release excess steam pressure by bleeding steam
B. Condense steam
C. Remove condensate and inert gases
D. None of these

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called_______________?

A. Natural convection
B. Radiation
C. Forced convection
D. Conduction

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area___________________?

A. Decreases
B. Increases
C. Remain constant
D. Passes through a maxima

_____________ paint has the minimum absorption co-efficient?

A. Grey
B. White lead
C. Black
D. Light cream

The film thickness for laminar film condensation on vertical surface _____________ from top to bottom?

A. Cumulatively increases
B. Remain constant
C. Cumulatively decreases
D. And the surface conductance increase

Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on_____________?

A. T1 – Ta
B. T1 – T2
C. T2 – Ta
D. None of these

Duhring‟s rule is important in solving problems on__________________?

A. Crystallisation
B. Distillation
C. Evaporation
D. Humidification

Which of the following is concerned with both heat and mass transfer ?

A. Lewis relationship
B. Nusselt number
C. Froude number
D. Kutateladze number

Controlling heat transfer film co-efficient is the one, which offers ______________ resistance to heat transfer?

A. The least
B. No
C. The largest
D. Lower

____________ chart is known as transient heat conduction chart?

A. Dirhing’s
B. Mollier’s
C. Heisler’s
D. Cox

Baffles in the shell side of a shell and tube heat exchanger ?

A. Force the liquid to flow parallel to the bank
B. Increase the cross-section of the shell side liquid
C. Increase the shell side heat transfer co-efficient
D. Decrease the shell side heat transfer co-efficient

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?

A. 1.74
B. 1
C. 6.1
D. 37

What is the steam economy in case of a single effect evaporator system ?

A. > 1
B. 1
C. < 1
D. 0.1

Vibrations in the tubes of a shell and tube heat exchanger is induced due to the _________________?

A. Oscillations in the flow of shell/tube sides fluid
B. Flow of fluid on the tube and shell sides
C. Vibrations transmitted through piping and/or supports due to external reasons
D. All A., B. and C.

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

A. Stanton
B. Prandtl
C. Peclet
D. Nusselt

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?

A. 4000
D. > 10000

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?

A. d-1
B. d-0.2
C. d0.8
D. d-1.8

For a perfectly transparent surface (like gases), the____________________?

A. Reflectivity = 0
B. Transmissivity = 1
C. Absorptivity = 0
D. All A., B. & C.

If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?

A. Not affect
B. Decrease
C. Increase
D. Increase the condensing film co-efficient as well as

Fluid Mechanics Mcqs

Heat waves_____________________?

A. Cannot pass through vacuum
B. Can be reflected by a mirror
C. Travel in straight line
D. Both B. and C.

1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be__________________?

A. 22 min
B. 15 min
C. 44 min
D. 51 min

For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?

A. Parallel
B. Backward
C. Forward
D. None of these

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?

A. Higher economy
B. Lower economy
C. Both A. & B.
D. Lower capacity

Pick out the wrong statement?

A. The capacity of an evaporator is reduced by the boiling point elevation
B. Steam jet ejector is used for vapor compression in a thermal recompression evaporator
C. Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger
D. Heat sensitive materials should be concentrated in high pressure evaporators

Pick out the wrong statement ?

A. Distillation process is not the same as evaporation
B. The equivalent diameter of heat transfer for a duct of square cross-section (having each side as ‘x’) is equal to 4x
C. In case of heat transfer by purely forced convection, GR/Re 2 ≤ 1
D. The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface

Pick out the wrong statement ?

A. In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles
B. Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient
C. S.I. unit of fouling factor is Watt/m2.°K
D. Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Which of the following is correct ?0

A. Resistance = Driving force × Rate
B. Driving force = Rate × Resistance
C. Rate = Driving force × Resistance
D. Rate = Resistance/Driving force

Pick out the wrong statement ?

A. Heat transfer by radiation cannot occur across an absolute volume
B. In case of a shell and tube heat exchanger, the pressure drop through the shell is proportional to the number of times the fluid crosses the bundle between baffles
C. The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same
D. Propagation velocity for travel of heat radiation through vacuum is equal to the velocity of the light

Chemical Engineering Basics Mcqs

Pick out the wrong statement?

A. Swenson-Walker crystalliser is a batch crystalliser
B. The liquor left after the removal of crystals from a solution is called mother liquor
C. Super saturation of the solution is the driving potential for a crystal growth
D. The first stage of crystal formation is called nucleation

Pick out the wrong statement?

A. Unit of thermal conductance is W/°K
B. Reciprocal of the resistance to heat flow is called thermal conductance
C. Thermal conductance of a wall of thickness ‘L’, thermal conductivity ‘k’ and heat flow area ‘A’ is kL/A
D. None of these

Pick out the wrong statement?

A. Orifice baffles are never used in a shell and tube heat exchanger
B. Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers
C. In a horizontal tube evaporator, surface blanketing by air is avoided
D. Pressure drop on the shell side of a heat exchanger depends upon tube pitch also

Pick out the wrong statement ?

A. The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature
B. The controlling resistance in case of heating of air by condensing steam is in the air fil
C. In case of a 1 – 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs
D. Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature

Pick out the wrong statement ?

A. In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile liquid and is to be transferred for storage
B. Film co-efficient for vaporisation decreases as a result of vapor binding
C. The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation
D. Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film coefficient, which is higher

Pick out the wrong statement ?

A. With change in temperature, the radiant energy emitted by a black body remains unchanged
B. Absorptivity of a perfectly black body is unity
C. Absorptivity of a body approaches unity in case of diffuse reflection
D. Value of Stefan-Boltzmann constant is 4.876 × 10-8 KCal/m2.hr.°K4

Choose the correct equation ?

A. Nu = (Re) (Pr)
B. Nu = (Re) (Pr) (St)
C. Nu = (Re) (Pr) (Gz)
D. Nu = (Pr) (St)

Pick out the wrong statement ?

A. In heat exchanger calculations (Δt) weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling
B. ‘Solvates’ are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a ‘hydrate’
C. Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted
D. In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Pick out the correct statement ?

A. The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature
B. Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder
C. Higher is the temperature of the radiating body, higher is the wavelength of radiation
D. Solid angle subtended by the finite surface at the radiating element is called the angle of incidence

Chemical Reaction Mcqs

Pick out the wrong statement ?

A. Finned tube heat exchangers are suitable for heating air by steam
B. Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature
C. Double pipe heat exchangers are mostly used in the field of refrigeration
D. Economy of a multiple effect evaporator is not influenced by the boiling point elevation

Pick out the correct equation ?

A. jH = (St)(Pr)2/3 = f/2
B. jH = (St)2/3(Pr) = f/2
C. jH = (St)(Pr)1/3 = f/2
D. jH = (St)1/3(Pr) = f/2

Pick out the wrong statement?

A. When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum
B. The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1
C. In process heat exchangers, saturated steam is preferred over the superheated steam
D. A body at 925 K emits an energy of 1.42 x 1011ζW/m2 (ζ is the Stefan-Boltzmann constant) in the wavelength band between 3 μm to 4 μm. The fraction of this energy in the total energy emitted over the entire wavelength range is equal to emissivity

Pick out the wrong statement/

A. The emissivity of a surface decreases, if it gets corroded by atmospheric environment
B. The emissivity of a surface increases with increase in surface roughness
C. The emissivity of a non-metallic surface decreases with increase in the temperature
D. The emissivity of a polished surface is quite low

Pick out the wrong statement ?

A. Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number
B. In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2
C. Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger
D. Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Pick out the wrong statement?

A. Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator
B. Thermal conductivity of a dry material is more than that of the damp material
C. Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling
D. Vaporisation of organic substances in evaporator mostly causes foam formation

Pick out the wrong statement?

A. The ratio NNu/NRe . Npr is called the Stanton number
B. Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection
C. The Peclet number is a measure of the ratio of energy transport by convection to that by conduction
D. The Colburn jH factor for heat transfer is given by Nst Npr

Pick out the wrong statement ?

A. The boiling point of a solution is affected by liquid head as well as boiling point elevation
B. Filmwise condensation takes place on non-wettable surfaces
C. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation
D. None of these

Pick out the correct statement ?

A. 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F
B. In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
C. In heat transfer by forced convection, Grashoff number is very important
D. In unsteady state heat conduction, heat flows in the direction of temperature rise

Baffles are provided in heat exchangers to____________?

A. Reduce vibrations
B. Increase heat transfer rate
C. Remove dirt
D. Reduce heat transfer rate

Maximum heat transfer rate can be expected in case of_________?

A. Co-current flow
B. Laminar flow
C. Turbulent flow
D. Heat flow rate is independent of nature of flow

Latest Chemical Engineering MCQs – Chemical Heat Transfer MCQs

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