chemical engineering MCQs – Page 224

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 Review each marked answer and report any item that may be outdated or unclear.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

4461. Heat of ____________ of a fuel is called its calorific value?
0

A. Formation

B. Combustion

C. Reaction

D. Vaporisation

4462. Pick out the wrong statement ?
0

A. Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient

B. Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

C. In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles

D. S.I. unit of fouling factor is Watt/m2.K

4463. Magnesite refractories are generally not used in the__________________?
0

A. Steel melting furnace

B. Burning zone of cement kilns

C. Open hearth furnace

D. Electric furnace walls

4464. Avogadros number is equal to__________________?
0

A. 6.023 1026 molecules/gm.mole

B. 6.023 1023 molecules/kg.mole

C. 6.023 1023 molecules/gm.mole

D. 6.023 1016 molecules/kg.mole

4465. Pick out the wrong statement ?
0

A. Solvates are chemical compounds formed by solute with their solvents. When water is the

B. Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted

C. al tube cross-sectional area

D. p; sub-cooling

E. In heat exchanger calculations (?t) weighted is used in place of ?t, when it involves more

F. In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the

4466. Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by__________________?
0

A. Conduction

B. Convection

C. Eddies current

D. None of these

4467. The purpose of floating head in a heat exchanger is to_________________?
0

A. Provide support for tubes

B. Decrease the pressure drop

C. Avoid buckling of tubes

D. Facilitate its lengthening, if needed

4468. Among liquids, water has a comparatively high value of thermal conductivity, due to its__________________?
0

A. Partial ionisation

B. High viscosity

C. Low density

D. Dense structure

4469. 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_________________?
0

A. Infinity

B. Zero

C. Minimum

D. Maximum

4470. Pick out the wrong statement?
0

A. Split ring type and pull through type floating heads are two commonly used floating heads is

B. t exchangers

C. Orifice baffles are never used in a shell and tube heat exchanger

D. Pressure drop on the shell side of a heat exchanger depends upon tube pitch also

E. In a horizontal tube evaporator, surface blanketing by air is avoided

4471. Kinematic viscosity of 1 m2 /second is equivalent to _____________ stokes?
0

A. 102

B. 10

C. 104

D. 103

4472. The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 __________?
0

A. 1023

B. 1026

C. 1019

D. 1020

4473. Panel test determines the ______________ of refractories?
0

A. Refractoriness under load (RUL)

B. Slag penetration resistance

C. Spalling resistance

D. Fusion point

4474. Pick out the wrong statement about the recycle stream in a process ?
0

A. ntity of the same reactant entering the process as fresh feed is called combined feed ratio

B. Recycling in a process does not help in getting higher extent of reaction

C. ntain the quantity of liquid within the column

D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to

E. Recycling in a process stream helps in utilising the valuable reactants to the maximum with

F. imum loss of reactants

4475. Controlling heat transfer film co-efficient is the one, which offers ______________ resistance to heat transfer?
0

A. No

B. The largest

C. Lower

D. The least

4476. Molality is defined as the number of gm moles of solute per _____________ of solvent?
0

A. kg

B. Litre

C. gm

D. gm.mole

4477. Crystallisation of solids from a homogeneous solution is a/an ______________ process?
0

A. Mildly endothermic

B. None of these

C. Exothermic

D. Highly endothermic

4478. Pick out the wrong statement ?
0

A. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation

B. None of these

C. Filmwise condensation takes place on non-wettable surfaces

D. The boiling point of a solution is affected by liquid head as well as boiling point elevation

4479. The unit of specific heat at constant pressure, Cp, in SI unit is__________________?
0

A. J/m3K

B. W/mK

C. J/kgK

D. W/m2C

4480. Which of the following is insensitive to changes in pressure ?
0

A. Heat of vaporisation

B. Melting point

C. Heat of fusion

D. Both B. and C.

Previous Next

Showing 4461 to 4480 of 8709 mcqs