chemical engineering chemical engineering basics MCQs – Page 38

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs

741. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of__________________?
0

A. 25/2

B. 23/2

C. 23

D. 21/3

742. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?
0

A. Fatigue

B. Creep

C. Toughness

D. Tensile strength

743. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of________________?
0

A. Glass wood

B. Steel

C. Fireclay bricks

D. Copper

744. What is the range of tempering temperature (C) for most of the materials ?
0

A. 350-450

B. 200-300

C. 75-100

D. 500-600

745. Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
0

A. Resistance to vegetable acids as the tin plate are commercially used in canning industry

B. None of these

C. Abundant availability

D. Lower cost

746. Regeneration of molecular sieve requires it to be heated to a temperature of about __________________ C?
0

A. 200-300

B. 1000-1100

C. 600-800

D. 80-120

747. Pick out the wrong statement?
0

A. Processing of thermosetting plastics is ideally done by injection moulding

B. Stretch forming is a process of cold drawing

C. Mass production of seamless pipes are done by electrical resistance welding (ERW)

D. Processing of thermoplastics is ideally done by compression moulding

748. Out of the following substances, one ton of ______________ will store the maximum heat for a rise of 30C in temperature ?
0

A. Lignite

B. Steel

C. Lime stone

D. Water

749. Ammonia gas can be dried by___________________?
0

A. Quick lime

B. Concentrated H2SO4

C. PCl5

D. CaCl2

750. Surface tension of a liquid_________________?
0

A. All A, B. & C

B. Decreases with rise in temperature

C. Is responsible for the spherical shape of an isolated liquid drop

D. Is due to intermolecular forces of cohesion

751. Pick out the correct statement ?
0

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_________________?
0

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?
0

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________________?
0

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_____________________?
0

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_________________?
0

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 ?
0

A. None of these

B. Helium

C. Oxygen

D. Carbon dioxide

758. Pick out the wrong statement ?
0

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_________________?
0

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________________?
0

A. 5000Pa

B. 3171Pa

C. 3567Pa

D. 1.01 105Pa

Previous Next

Showing 741 to 760 of 767 mcqs