chemical engineering chemical engineering basics Mcqs
751. Pick out the correct statement ?
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A. Jet engine can work, where there is no atmosphere

B. Rocket engines cannot work, where there is no atmosphere

C. Rocket engines carry oxygen required for the combustion in the form of oxidiser

D. Jet engines also carry oxidiser

752. A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place_________________?
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A. The better insulating material should be put outside

B. Either of the insulating material could be put on either side

C. The better insulation material should be put just next to pipe (i.e., inside)

D. ide (i.e., just next to the pipe)

E. Steam temperature is considered before deciding as to which insulating material is to be put

753. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is ________________ mm?
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A. 30

B. 25

C. 10

D. 15

754. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?
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A. Counter flow with unequal heat capacities

B. Parallel flow with equal heat capacities

C. Parallel flow with unequal heat capacities

D. Counter flow with equal heat capacities
755. Boiler draught of 10 mm water column is equivalent to_____________________?
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A. 10 kgf/m2

B. 10 kgf/mm2

C. 1 kgf/mm2

D. 1 kgf/m2

756. The activity of pure hydrogen gas at 1000C and 5 atm pressure_________________?
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A. Can be 5

B. Depends on the choice of the standard state

C. Is always greater than 1

D. Is always less than 1

757. Which one can be directly solidified from gaseous state without entering into liquid state ?
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A. None of these

B. Helium

C. Oxygen

D. Carbon dioxide
758. Pick out the wrong statement ?
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A. For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire

B. The equivalent stiffness of two springs (of equal stiffness S) in series is S/2 while in parallel

C. Modulus of resilience is proportional to (stress at elastic limit)2

D. meter)

E. Crushing load or columns is less than the buckling load

F. 2S

759. One of the methods of purification of leach liquor is ion exchange, which involves_________________?
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A. Exchange between two liquid phases

B. Exchange between a gaseous phase and a liquid phase

C. Exchange between a solid phase and a gas phase

D. Exchange between a liquid phase and an organic resin phase
760. The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be________________?
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A. 5000Pa

B. 3171Pa

C. 3567Pa

D. 1.01 105Pa

761. Glass reacts with___________________?
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A. HF

B. HNO3

C. K2Cr2O7

D. H2SO3

762. Pick out the wrong statement?
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A. e imperfections

B. sed by the formation and coalescence of voids in the necked region

C. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly

D. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of

E. Brittle materials are generally tested in tension

F. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
763. Thermal equivalent of electrical power in practical calculation is _______________ kcal/kWh ?
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A. 550

B. 746

C. 3000

D. 1000

764. An example of unsteady non uniform flow is the flow of liquid under pressure through a__________________?
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A. Tapering pipe at constant flow rate

B. Tapering pipe at either decreasing or increasing flow rate

C. Long pipeline of constant diameter

D. None of these

765. A material being tested for endurance strength is subjected to the _______________ load ?
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A. Impact

B. Completely reversed

C. Static & dynamic

D. Dynamic

766. The laughing gas is__________________?
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A. Nitrous oxide

B. Nitrogen trioxide

C. Nitrogen pentoxide

D. Nitric oxide

767. The minimum temperature to which the water can be cooled in a cooling tower is the ______________ temperature of air?
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A. Dry bulb

B. Ambient

C. Wet bulb

D. Dew point